Y029008 1 1569212 E.I. Monthly No: EI8512120268 MICROWAVE MEASUREMENT OF DIELECTRIC PROPERTIES OF LOW-LOSS MATERIALS BY THE DIELECTRIC ROD RESONATOR METHOD. Kobayashi, Yoshio; Katoh, Masayuki Saitama Univ, Dep of Electrical Engineering, Urawa, Jpn IEEE Transactions on Microwave Theory and Techniques v MTT-33 n 7 Jul 1985 p 586-592 CODEN: IETMAB ISSN: 0018-9480 Lang.: Eng. Doc. Type: JA; (Jrnl Art.) Treatment: T; (Theoretical); X; (- Experimental) Improvements in both accuracy and speed are described for the technique of measuring the microwave dielectric properties of low-loss materials by using a dielectric rod resonator short-circuited at both ends by two parallel conducting plates. A technique for measuring the effective surface resistance R//s of the conducting plates is proposed to allow the accurate measurement of the loss tangent tan DELTA . By means of a first-order approximation, expressions are analytically derived for estimating the errors of the measured values of relative permittivity EPSILON //r, tan DELTA, and R//s, for measuring the temperature coefficient of EPSILON //r, and for determining the required size of the conducting plates. Computer-aided measurements are realized by using these expressions. It is shown that the temperature dependence of R//s should be considered in tan DELTA measurements. Experimental results are given for a 99. 9-% alumina ceramic rod sample. 12 refs. Desc.: *MICROWAVE MEASUREMENTS; MATERIALS--Dielectric Properties; RESONATORS--Applications; MATHEMATICAL TECHNIQUES--Approximation Theory; TEMPERATURE MEASUREMENT--Computer Applications; MEASUREMENT ERRORS Ident.: DIELECTRIC ROD RESONATOR; LOW-LOSS MATERIALS; LOSS TANGENT; PARALLEL CONDUCTING PLATES SHORT-CIRCUIT; ERROR ESTIMATION OF MEASURED VALUES Class. Codes: 942 (Electrical & Electronic Measuring Instruments); 701 (Electricity & Magnetism); 708 (Electric & Magnetic Materials); 921 (Applied Mathematics); 723 (Computer Software); 944 (Moisture, Pressure & Temperature, & Radiation Measuring Instruments) 94 (INSTRUMENTS & MEASUREMENT); 70 (ELECTRICAL ENGINEERING); 92 (ENGINEERING MATHEMATICS); 72 (COMPUTERS & DATA PROCESSING) Y029008 2 1565222 E.I. Monthly No: EI8512120261 MICROWAVE LOSS QUALITY OF BaZn//1/////3Ta//2/////3O//3 CERAMICS. Desu, . B.; O'Bryan, H. M. AT&T Technologies, Engineering Research Cent, Princeton, NJ, USA Journal of the American Ceramic Society v 68 n 10 Oct 1985 p 546-551 CODEN: JACTAW ISSN: 0002-7820 Lang.: Eng. Doc. Type: JA; (Jrnl Art.) Treatment: A; (Applications); X; - (Experimental) In the past few years a number of materials have been developed as microwave dielectrics. For these compositions with Zn it was found that the microwave loss quality Q was improved by sintering at very high temperatures or for longer times at lower temperatures. The increased Q has been explained in terms of ordering of Zn and Ta ions on the B site of the perovskite lattice. 10 refs. Desc.: *MICROWAVE DEVICES--*Manufacture; CERAMIC MATERIALS-- Sintering; OSCILLATORS, MICROWAVE--Performance Ident.: CERAMIC RESONATORS; SINTERING PROCESS CONTROL; PEROVSKITE LATTICE Class. Codes: 714 (Electronic Components); 715 (General Electronic Equipment); 812 (Ceramics & Refractories); 713 (Electronic Circuits) 71 (ELECTRONICS & COMMUNICATIONS); 81 (CHEMICAL PROCESS INDUSTRIES) Y029008 3 159876 E.I. Monthly No: EI8509082193 EXPERIMENT ES 311: BUBBLE REINFORCED MATERIALS. Barbieri, F.; Gondi, P.; Montanari, R.; Patuelli, C. Univ di Bologna, Dipartimento di Fisica, Bologna, Italy Earth-Oriented Applications of Space Technology v 5 n 1-2 1985, Spacelab to Space Stn, Proc of an Int Symp on Spacelab 1 Results, Implic and Perspect, Naples and Capri, Italy, Jun 11-16 1984 p 57-62 CODEN: EOATDY Lang.: Eng. Doc. Type: JA; (Jrnl Art.) Treatment: X; (Experimental) Specimens treated in the Experiment ES 311, run (a) and (b), are considered. The following research subjects are discussed: containment efficiency of thin film coatings, showing different wettabilities with respect to the metal samples; behavior suspension of solid particles, gas bubbles, liquid droplets in the liquid metal and during solidification; and eutectic solidification structures with eventual uphill diffusion effects in the liquid. 7 refs. Desc.: *POWDER METALLURGY--*Sintering; SPACE SHUTTLES--Research; FILMS--Metallic; SILVER AND ALLOYS; COPPER POWDER Ident.: BUBBLE REINFORCED MATERIALS; OXIDES; SOLIDIFICATION; EUTEC?ICS; ELECTROLYTIC DEPOSITION Class. Codes: 536 (Powder Metallurgy); 655 (Spacecraft); 544 (Copper & Alloys); 547 (Precious & Rare Earth Metals & Alloys) 53 (METALLURGICAL ENGINEERING); 65 (AEROSPACE ENGINEERING); 54 (METAL GROUPS) Y029008 4 1529296 E.I. Monthly No: EI8509074945 METHODS FOR LABORATORY-SCALE EVALUATION OF CATALYST LIFE IN INDUSTRIAL PLANTS. Pernicone, N. Istituto Guido Donegani, Gruppo Montedison, Novara, Italy Applied Catalysis v 15 n 1 Mar 1 1985, Charact of Act, Sel and Deact of Solid Catal, Bochum, West Ger, Jul 10-11 1984 p 17-31 CODEN: APCADI ISSN: 0166-9834 Lang.: Eng. Doc. Type: JA; (Jrnl Art.) Treatment: X; (Experimental) After having defined the main types of deactivation causes responsible for decreased catalyst life in industrial plants (chemical and depositive poisoning, thermal and chemical sintering, solid state reactions, loss of active components), the requisites of reliable life tests are discussed. It is shown that relativ accelerated tests are needed; two different types of tests can be used, defined here as 'Continuous' and 'Before-After' tests, respectively abbreviated as C and BA tests. The need of preliminary studies of deactivation mechanisms is stressed and the experimental techniques to be used in such studies, depending on the cause of deactivation, are mentioned. 5 refs. Desc.: *CATALYSTS--*Deactivation; CATALYSIS Ident.: CHEMICAL POISONING; SINTERING; LOSS OF ACTIVE COMPONENTS; DEPOSITIVE POISONING; SLURRY CATALYSTS Class. Codes: 803 (Chemical Agents & Basic Industrial Chemicals) ; 804 (Chemical Products); 802 (Chemical Apparatus & Plants) 80 (CHEMICAL ENGINEERING) Y029008 5 1521577 E.I. Monthly No: EI8509076681 MICROWAVE DIELECTRIC DEVICES FOR MOBILE COMMUNICATIONS. Miyake, Hideyuki; Nakamura, Toshiaki; Fujikawa, Makoto; Fujino, Takashi; Aizawa, Kimio; Sakiyama, Mitsuhisa; Ishibasi, Munehiro; Koyama, Ichiro Matsushita Nitto Electric Co, Jpn Natl Tech Rep Matsushita Electr Ind Co v 31 n 2 Apr 1985 p 115-123 CODEN: NTROAV ISSN: 0028-0291 Lang.: JAPANESE Doc. Type: JA; (Jrnl Art.) With frequent use of the microwave band for mobile communication systems, small and light equipment with low cost is sought. Dielectric coaxial resonators using microwave ceramics are expected to meet these requirements, but they have the problem of ineffective productivity because of the fluctuation of the dielectric constant and processing tolerance. A dielectric coaxial resonator with a variable frequency (Varisonator) is introduced to over the fluctuation of several parameters such as shape, dielectric constant, etc. , resulting in a small and light dielectric filter (antenna duplexer and small band-pass filter). Moreover, a voltage controlled oscillator (VCO) and a mixer with the dielectric resonator and semiconductors have been developed. The antenna duplexer has an isolation of 32 db between the transmitter and receiver, the small band-pass filter has a height of 10 mm max., the VC has a consumption current of 15mA max. and a C/N of 70 db min., and the mixer has an NF of 5 db max. 11 refs. In Japanese with English abstract. Desc.: *DIELECTRIC DEVICES--*Microwaves; TELECOMMUNICATION SYSTEMS, MOBILE--Equipment; RESONATORS; OSCILLATORS Ident.: DIELECTRIC COAXIAL RESONATORS; ANTENNA DUPLEXER; VOLTAGE CONTROLLED OSCILLATOR (VCO) Class. Codes: 714 (Electronic Components); 716 (Radar, Radio & TV Electronic Equipment) 71 (ELECTRONICS & COMMUNICATIONS) Y029008 6 1515392 E.I. Monthly No: EI8508062887 MICROWAVE PLASMA SINTERING OF ALUMINA. Kemer, Eric L.; Johnson, D. Lynn Northwestern Univ, Materials Research Cent, Evanston, IL, USA American Ceramic Society Bulletin v 64 n 8 Aug 1985 p 1132-1136 CODEN: ACSBA7 ISSN: 0002-7812 ISBN: 0-916150-56-9 Lang.: Eng. Doc. Type: JA; (Jrnl Art.) Treatment: A; (Applications) The objective of the present research was to investigate the application of a microwave-induced plasma for the enhanced sintering of ceramics. In particular the zone sintering behavior of Al//2O//3 doped with 0. 25 wt% MgO was optimized and characterized as a function of the key plasma sintering process variables. 17 refs. Desc.: *ALUMINA--*Sintered; CERAMIC MATERIALS -Sintering; PLASMAS-- Heating Ident.: HEATING SOURCES; MICROWAVE-INDUCED PLASMA; DENSIFICATION; SHRINKAGE Class. Codes: 812 (Ceramics & Refractories); 932 (High Energy, Nuclear & Plasma Physics) 81 (CHEMICAL PROCESS INDUSTRIES); 93 (ENGINEERING PHYSICS) Y029008 7 1511482 E.I. Monthly No: EI8508066876 CONTROLLED MICROWAVE HEATING AND MELTING OF GELS. Roy, Rustum; Komarneni, S.; Yang, L. J. Pennsylvania State Univ, Materials Research Lab, University Park, PA, USA Journal of the American Ceramic Society v 68 n 7 Jul 1985 p 392-395 CODEN JACTAW ISSN: 0002-7820 ISBN: 0-12-085480-5 Lang.: Eng. Doc. Type: JA; (Jrnl Art.) Treatment: A; (Applications); X; - (Experimental) Controlled microwave heating and melting of silica, alumina, and aluminosilicate gels were achieved in a 600-W domestic-type oven. The microwave absorption mechanism of these gels is not yet clear. However, parameters were defined whereby rapid heating (including melting) is achieved for these gels. Empirical results indicate that the heating behavior is dependent on the chemistry, structure, and mass of the gel. 12 refs. Desc.: *GELS--*Processing; OVENS, INDUSTRIAL--Heating; MICROWAVES-- Applications; GLASS MANUFACTURE--Melting Ident.: ALUMINA GEL; SILICA GEL; MICROWAVE OVEN; MULLITE GELS Class. Codes: 804 (Chemical Products); 642 (Industrial Furnaces & Process Heating); 711 (Electromagnetic Waves); 812 (Ceramics & Refractories) 80 (CHEMICAL ENGINEERING); 64 (HEAT & THERMODYNAMICS); 71 (ELECTRONICS & COMMANICATIONS); 81 (CHEMICAL PROCESS INDUSTRIES) Y029008 8 1509966 E.I. Monthly No: EI8508065044 HIGH METAL-REMOVAL RATES WITH CERAMICS. Funabashi, Tony NGK Spark Plugs (USA) Inc, NTK Cutting Tools, Southfield, MI, USA Carbide and Tool Journal v 17 n 3 May-Jun 1985 p 22-27 CODEN: CTJOD9 ISSN: 0192-8333 ISBN: 0-89116-297-6 Lang.: ENGLISH Doc. Type: JA; (Jrnl Art.) Treatment: G; (General Review) A state-of-the-art overview of ceramic cutting materials is given to show where they fit into today's metal-removal marketplace. How the mechanical properties and characteristics of ceramics enable these materials to deal with high-speed machining conditions is explained through a discussion of the two types of ceramic materials, which are commercially available for meta-cutting applications at this time. The two types of ceramics are cold-pressed pure aluminum oxide (Al//20//3) and hot pressed aluminum oxide plus titanium carbide (Al//2O//3 PLUS TiC). Desc.: *CUTTING TOOLS--*Ceramic; CERAMIC MATERIALS-- Mechanical Properties; ALUMINA--Applications; TITANIUM CARBIDE--Applications; CERAMIC PRODUCTS--Manufacture Ident.: COLD PRESSED ALUMINUM OXIDE; HOT PRESSED ALUMINUM OXIDE; SILICON NITRIDE Class. Codes: 603 (Machine Tools); 812 (Ceramics & Refractories); 421 (Materials Properties); 804 (Chemical Products) 60 (MECHANICAL ENGINEERING); 81 (CHEMICAL PROCESS INDUSTRIES); 42 (MATERIALS PROPERTIES & TESTING); 80 (CHEMICAL ENGINEERING) Y029008 9 1507612 E.I. Monthly No: EI8508072929 STUDY OF THE TOOL LIFE OF TiC AND TiC PLUS Al//2O//3 CHEMICAL VAPOUR DEPOSITED TUNGSTEN CARBIDE TOOLS. Kim, N. H.; Chun, J. S. Korea Advanced Inst of Science & Technology, Dep of Materials Science & Engineering, Seoul, South Korea Journal of Materials Science v 20 n 4 Apr 1985 p 1285-1290 CODEN: JMTSAS ISSN: 0022-2461 Lang.: Eng. Doc. Type: JA; (Jrnl Art.) Treatment: T; (Theoretical); X; (- Experimental) A low carbon steel workpiece is turned on a lathe at a feed rate of 0.206 to 0. 410 mm rev** MINUS **1 and a depth of cut of 0. 1 to 0. 5 mm for cutting velocities between 100 and 250 m in** MINUS **1. Data are analyzed using both Taylor's tool life equation and Wu's tool life method. Results are similar for both methods but Wu's method seems to give more consistent results. Compared to an uncoated tungsten carbide tool, the tool life of both the coated tools are from 5 to 7 times longer and the improvement is greater at higher cutting speeds. The TiC plus Al//2O//3 coated tool is slightly superior to the TiC coated tool. The wear mechanism and a possible explanation of increased tool life for the coated tools are discussed. 17 refs. Desc.: *TUNGSTEN CARBIDE--*Protective Coatings; TITANIUM CARBIDE-- Vapor Deposition; ALUMINA; WEAR OF MATERIALS; CUTTING TOOLS--Carbide Ident.: TOOL LIFE; CHEMICAL VAPOR DEPOSITION; TAYLOR'S TOOL LIFE EQUATION Class. Codes: 804 (Chemical Products); 603 (Machine Tools); 812 (Ceramics & Refractories); 931 (Applied Physics); 421 (Materials Properties); 539 (Metals Corrosion & Protection) 80 (CHEMICAL ENGINEERING); 60 (MECHANICAL ENGINEERING); 81 (CHEMICAL PROCESS INDUSTRIES); 93 (ENGINEERING PHYSICS); 42 (MATERIALS PROPERTIES & TESTING); 53 (METALLURGICAL ENGINEERING) Y029008 10 1494479 E.I. Monthly No: EI8506045102 DOUBLE-LAYER INSULATION OF POLYIMIDE AND PERFORATED NITRIDE. Anon IBM Technical Disclosure Bulletin v 27 n 10A Mar 1985 p 5835-5836 CODEN: IBMTAA ISSN: 018-8689 ISBN: 0-8412-0851-4 Lang.: Eng. Doc. Type: JA; (Jrnl Art.) Treatment: A; (Applications) With double-layer insulations of polyimide and plasma-deposited material, such as SiN, SiO//2, SiN//xO//y, etc., the gassing out of the polyimide at about 350 to 400 DEGREE may lead to gas eruptions breaking up the nitride and to defects during the sintering of the subsequently deposited metal layers. The invention consists of a rasterlike matrix of holes in nitride through which gases may escape during sintering and by which defects are prevented. Desc.: *ELECTRIC INSULATING MATERIALS--*Plastics; POLYIMIDES Ident.: DOUBLE-LAYER INSULATION; PERFORATED NITRIDE; PLASMA-DEPOSITED MATERIAL Class. Codes: 413 (Insulating Materials); 817 (Plastics, Products & Applications) 41 (CONSTRUCTION MATERIALS); 81 (CHEMICAL PROCESS INDUSTRIES) Y029008 11 490941 E.I. Monthly No: EI8506043561 Dry Friction of Metal-Ceramic Couples: Important Phenomena. FROTTEMENT SEC DE COUPLES ACIER/CERAMIQUE: PHENOMENES IMPORTANTS. Kapsa, Ph.; Viot, J. F. Ecole Centrale de Lyon, Lab de Technologie des Surfaces, Ecully, Fr Revue Internationale des Hautes Temperatures et des Refractaires v 21 n 1 1984 p 47-61 CODEN: RIHTAV ISSN: 0035-3434 ISBN: 0-226-06604-5 Lang.: FRENCH Doc. Type: JA; (Jrnl Art.) Treatment: X; (Experimental) Frictional behavior of steel on ceramic couples has been studied using a rubbing steel sphere on a straight surface of four types of ceramic materials, namely: sintered alumina, zircon, and two types of silicon nitride. The main modes of surface damage due to dry friction have been exhibited and the effects on friction and wear of normal load, speed, and temperature have been studied. The surfaces damage consists, in a specific distribution for each ceramic, of the following phenomena: metallic transfers due to adhesion; stripping of ceramic particles by abrasion or by cracking; and plastic deformation. The importance of these damages increases with the value of the normal load but is not sensitive to sliding speed in the studied range. Higher temperature (500 DEGREE C) seem to promote transfers. 21 refs. In French. Desc.: *CERAMIC MATERIALS--*Friction; WEAR OF MATERIALS Ident.: STEEL-CERAMIC FRICTION; FRICTION-DEPENDENT SURFACE DAMAGE Class. Codes: 812 (Ceramics & Refractories); 421 (Materials Properties) 81 (CHEMICAL PROCESS INDUSTRIES); 42 (MATERIALS PROPERTIES & TESTING) Y029008 12 1489628 E.I. Monthly No: EI8506049226 TRENDS, EXPECTATIONS FOR PCB LAMINATE MATERIALS. Guiles, C. L. Keene Corp, Howe Div, Rancho Cucamonga, CA, USA Electrionics v 31 n 2 Feb 1985 p 19-21 CODEN: ELTDX ISSN: 0745-4309 ISBN: 0-87762-327-9 Lang.: Eng. Doc. Type: JA; (Jrnl Art.) Treatment G; (General Review) In this article some of the driving forces that will push, pull, or drag the laminate industry through the late 1980's and into the 1990's are described. The increasing use of printed circuit boards at high frequencies, both in microwave electronics and in high speed logic devices (where use of 8 gigahertz, high switching speed systems is developing), is creating pressure to develop low dielectric constant, low loss materials with tight thickness tolerances to permit impedance matching. Yet, these must be compatible with the fabrication complexities inherent to the production of 15-20 layer multilayer boards. Another trend is the use of materials which are capable of withstanding elevated temperatures for extended periods of time. It is expected that in the microwave/high frequency area ceramic-filled fluoropolymer laminates that duplicate the dielectric constant (10. 2) of ceramic wafer materials will be used. Also noted is the significant increase in the use of polyimide laminate in jobs that have traditionally belonged to conventional epoxies. Desc.: *PRINTED CIRCUITS--*Materials; PLASTICS LAMINATES-- Applications Ident.: DIRECT SURFACE MOUNTING; PRINTED CIRCUIT BOARDS (PCB); POLYIMIDE LAMINATES Class. Codes: 703 (Electric Circuits); 713 (Electronic Circuits) 70 (ELECTRICAL ENGINEERING); 71 (ELECTRONICS & COMMUNICATIONS) Y029008 13 1476100 E.I. Monthly No: EI850424798 MICROWAVE DIELECTRIC PROPERTIES OF BARIUM-LANTHANOID TETRATITANATES. Butko, V. I.; Belous, A. G.; Nenashva, E. A.; Poplavko, Yu. M.; Ushatkin, E. F. Kiev Polytechnic Inst, Kiev, USSR Soviet Physics, Solid States (English translation of Fizika Tverdogo Tela) v 26 n 10 Oct 1984 p 1783-1785 CODEN: SPSSA7 ISSN: 0584-5807 ISBN: 0-8412-0890-5 Lang.: Eng. Doc. Type: JA; (Jrnl Art.) Treatment: X; (Experimental) The behavior of the complex permittivity EPSILON *** = EPSILON ' MINUS i EPSILON '' of polycrystalline samples of barium-lanthanoid tetratitanates BaLn//2Ti//4O//1//2 (Ln = La, Pr, Nd, Sm) was studied in the frequency range from 10** to 1. 8 X 10**1**1 Hz and over a wide temperature range from 80 to 1100 K. Anomalies were found in the behavior of EPSILON '' (T) for BaLa//2TiO//1//2 and BaSm//2Ti//4O//1//2, apparently caused by their 'transition-like' behavior. There is practically no dispersing of EPSILON ' at any of the temperatures and frequencies studied. The results are analyzed on the assumption that the dielectric contribution of the low-frequency vibrational modes predominates. 12 refs. Desc.: *BARIUM COMPOUNDS--*Dielectric Properties; MICROWAVES; THERMAL EFFECTS Ident.: BARIUM-LANTHANOID ?ETRATITANATES Class. Codes: 804 (Chemical Products); 701 (Electricity & Magnetism); 711 (Electromagnetic Waves) 80 (CHEMICAL ENGINEERING); 70 (ELECTRICAL ENGINEERING); 71 (ELECTRONICS & COMMUNICATIONS) Y029008 14 1471570 E.I. Monthly No: EI8504029527 Gyromagnetic Microwave Devices - Validity of Calculation Methods and Current Problems. LES DISPOSITIFS GYROMAGNETIQUES MICROONDES - VALIDITE DES METHODES DE CALCUL?ET PROBLEMES ACTUELS. Forterre, G. Thomson-CSF, Div Composants Microonde, Fr Revue Technique Thomson - CSF v 16 n 4 Dec 1984 p 737-771 CODEN: RTTCBG ISSN: 0035-4279 ISBN: 0-8247-7123-0 Lang.: FRENCH Doc. Type: JA; (Jrnl Art.) Treatment: T; (Theoretical); X; (- Experimental) Thirty years after their application to radiofrequencies, polarized magnetic ceramics are still the basis of many industrial devices and the source of new applications. An examination of the problems which limits the design and modeling of real devices defines the difficulties to be overcome, regarding the calculation and optimization of ferrite devices. The application of numerical methods would seem to be promising. Finally, recent materials and monocrystals are finding new applications. Refs. In French with English abstract. Desc.: *MICROWAVE DEVICES--*Design; CERAMIC MATERIALS--Magnetic Properties Ident.: GYROMAGNETIC MICROWAVE DEVICES; POLARIZED MAGNETIC CERAMICS Class. Codes: 714 (Electronic Components); 715 (General Electronic Equipment); 812 (Ceramics & Refractories); 701 (Electricity & Magnetism); 942 (Electrical & Electronic Measuring Instruments) 71 (ELECTRONICS & COMMUNICATIONS); 81 (CHEMICAL PROCESS INDUSTRIES); 70 (ELECTRICAL ENGINEERING); 94 (INSTRUMENTS & MEASUREMENT) Y029008 15 1467354 E.I Monthly No: EI8503017555 MILLIMETER-WAVE DIELECTRIC MEASUREMENT OF MATERIALS. Afsar, Mohammed Nurul; Button, Kenneth J. MIT, Natl Magnet Lab, Cambridge, MA, uSA Proceedings of the IEEE v 73 n 1 Jan 1985 p 131-153 CODEN: IEEPAD ISSN: 0018-9219 ISBN: 0-916150-52-6 Lang.: Eng. Doc. Type: JA; (Jrnl Art.) Treatment: T; (Theoretical) It is no longer necessary to use extrapolated microwave dielectric values when designing millimeter-wave components and systems. Very recently, highly accurate millimeter-wave (5- to 1/2-mm) data on complex dielectric permittivity and loss tangent have become available to engineers for a variety of materials such s common ceramics, semiconductors, crystalline, and glass materials. One quasi-optical measurement method has prove to be most accurate and reproducible, namely, dispersive Fourier transform spectroscopy (DFTS) applied to a polarizing interferometer. The open-resonator method and the Mach-Zehnder-IMPATT spectrometer will also be described and compared. The fact that the dielectric loss increases with frequency in the millimeter, unlike the microwave, is an important feature of these data. Reliable measurements also reveal that the methods of preparation of nominally identical specimens can change the dielectric losses by a factor of three. 74 refs. Desc.: *ELECTRIC MEASUREMENTS--*Millimeter Waves; MATERIALS-- Dielectric Properties; SPECTROSCOPY Ident.: DIELECTRIC MEASUREMENT; DIELECTRIC PERMITTIVITY; QUASI-OPTICAL MEASUREMENT; DISPERSIVE FOURIER TRANSFORM SPECTROSCOPY (DFTS) ; DIELECTRIC LOSS INCREASE Class. Codes: 942 (Electrical & Electronic Measuring Instruments); 711 (Electromagnetic Waves); 701 (Electricity & Magnetism) 708 (Electric & Magnetic Materials) 94 (INSTRUMENTS & MEASUREMENT); 71 (ELECTRONICS & COMMUNICATIONS); 70 (ELECTRICAL ENGINEERING) Y029008 16 1459215 E.I. Monthly No: EI850201083 METHODS FOR ASSESSING THE STRUCTURAL RELIABILITY OF BRITTLE MATERIALS. Freiman, Stephen W. (Ed. ); Hudson, C. Michael (Ed. ) NBS, Washington, DC, USA ASTM Spec Tech Publ 844, Methods for Assess the Struct Reliab of Brittle Mater, San Francisco, CA, USA, Dec 13 1982. Publ by ASTM, Philadelphia, PA, USA, 1984 229p CODEN: ASTTA8 ISSN: 0066-0558 ISBN: 0-8031-0265-8 For individual papers see E.I. Conference No.: 05916 in file 165 Lang.: Eng. Doc. Type: CP; (Conference Proceedings) Treatment: T; (Theoretical- ; X; (Experimental) This symposium proceedings contains 12 papers. The topics covered include: structural reliability of brittle materials fatigue master maps; ceramic material fatigue properties; contact induced surface flaws; glass ceramic dynamic and static fatigue; multiregion crack growth; defect size fracture mechanics; optical glass fiber delayed failure; ultrahigh-strength glass fatigue; silicon nitride lifetime predictions; brittle material flexure testing. Technical and professional papers from this conference are indexed and abstracted with the conference code no. 05916 in the Ei Engineering Meetings (TM) database produced by Engineering Information, Inc. Desc.: *MATERIALS--*Structural Analysis; CERAMIC MATERIALS-- Nondestructive Examination; ALUMINA--Crack Propagation; GLASS--Fatique; OPTICAL FIBERS--Failure; SILICON COMPOUNDS--High Temperature Effects Ident.: CONTACT-INDUCED SURFACE FLASH; GLASS CERAMIC FATIGUE; DEFECT SIZE ANALYSIS; BRITTLE MATERIAL TESTING; EIREV Class. Codes: 812 (Ceramics & Refractories); 931 (Applied Physics); 421 (Materials Properties); 741 (Optics & Optical Devices); 804 (Chemical Products); 422 (Materials Testing) 81 (CHEMICAL PROCESS INDUSTRIES); 93 (ENGINEERING PHYSICS); 42 (MATERIALS PROPERTIES & TESTING); 74 (OPTICAL TECHNOLOGY); 80 (CHEMICAL ENGINEERING) Y029008 17 1452918 E.I. Monthly No: EI8501002418 DIELECTRIC MEASUREMENTS OF MILLIMETER-WAVE MATERIALS. Afsar, Mohammed Nurul MIT, Natl Magnet Lab, Cambridge, MA, USA IEEE Transactions on Microwave Theory and Techniques v MTT-32 n 12 Dec 1984, 1984 MTT-S Int Microwave Symp and Jt Spec Pap on Microwave and Millim-Wave Monolithic Circuits, San Francisco, CA USA, May 29-Jun 1 1984 p 1598-1609 CODEN: IETMAB ISSN: 0018-9480 ISBN: 0-906674-23-9 Lang.: Eng. Doc. Type: JA; (Jrnl Art.) Treatment: T; (Theoretical); X; (- Experimental) It is no longer necesary to use extrapolated microwave dielectric data when designing millimeter-wave components, devices, and systems. Precision measurements can now be made to generate highly accurate millimeter-wave (5 to 1/2 mm) continuous spectra on complex refractive index, complex dielectric permittivity, and loss tangent for a variety of materials such as common ceramics, semiconductors, crystalline, and glassy materials. The continuous spectra reveal an increase in dielectric loss with increase in frequency in this wavelength range for most materials. Reliable measurements also reveal that the method of preparation of nominally identical specimens can change the dielectric losses by any factors. These broad-band measurements were carried out employing dispersive Fourier transform spectroscopy applied to a modular two-beam polarization interferometer. Data obtained with Fabry-Perot open resonator methods at wavelengths of 5 mm and longer are also compared. 45 refs. Desc.: *ELECTRIC MEASUREMENTS--*Dialectric Properties; MATERIALS-- Millimeter Waves Ident.: CONTINUOUS SPECTRA; COMPLEX REFRACTIVE INDEX; COMPLEX DIELECTRIC PERMITTIVITY; LOSS TANGENT; DIELECTRIC LOSSES Class. Codes: 942 (Electrical & Electronic Measuring Instruments); 708 (Electric & Magnetic Materials) 94 (INSTRUMENTS & MEASUREMENT); 70 (ELECTRICAL ENGINEERING) Y029008 18 1451044 E.I. Monthly No: EI8501006441 PROPERTIES OF COMPOSITE MATERIALS IN A BINDER MADE FROM REACTION-SINTERE SILICON NITRIDE. Bendovskii, E. B.; Guzman, I. Ya.; Safiulina, Z. F. Refractories (English translation of Og?eupory) v 25 n 3-4 Mar-Apr 1984 p 202-206 CODEN: REFRAL ISSN: 0034-3102 Lang.: Eng. Doc. Type: JA; (Jrnl Art.) Treatment: X; (Experimental) In order to study the possibility of preparing permeable articles of the same phase composition, the authors followed the change in properties with variations in the concentration of Si and evaluated the role of a grainy filler of SiC, corundum, high-alumina chamotte (68% Al//2O//3), and normal chamotte (42% Al//2O//3). The concentration of Si was varied from 0-26%. Changes in the phase composition, mass, porosity, apparent density, ultimate compressive strength, thermal expansion coefficient, thermal shock resistance, and gas permeability are reported. 2 refs. Desc.: *REFRACTORY MATERIALS--*Mechanical Properties Identifiers: BINDERS; COMPRESSIVE STRENGTH; THERMAL SHOCK; GAS PERMEABILITY; COEFFICIENT OF THERMAL EXPANSION Class. Codes: 812 (Ceramics & Refractories); 421 (Materials Properties) 81 (CHEMICAL PROCESS INDUSTRIES); 42 (MATERIALS PROPERTIES & TESTING) Y029008 19 1448820 E.I. Monthly No: EI8501000963 LATER KUCZYNSKI AN APPRECIATION OF HIS 'STATISTICAL THEORY' FROM THE EXPERIMENTALISTS' VIEWPOINT. Palmour, H. III; Batchelor A. D.; More, K. L.; Fang, T. T.; Paisley, M. J.; Goudey, G. T.; Hare, T. M. North Carolina State Univ, Dep of Materials Engineering, Raleigh, NC, USA Science of Sintering v 16 n 2 May 1984 p 77-89 CODEN: SCSNB4 Lang. ENGLISH Doc. Type: JA; (Jrnl Art.) Treatment: T; (Theoretical); X; (- Experimental) The authors review and discuss data from their own research on sintering of shock-conditioned alumina and titanium carbide ceramic powders which appear to support the central concepts of Kuczynski's statistical theory. 32 refs. Desc.: CERAMIC MATERIALS--*Sintering; ALUMINA--Sintered; TITANIUM CARBIDE--Sintered Ident.: SHOCK CONDITIONING Class. Codes: 812 (Ceramics & Refractories); 804 (Chemical Products); 536 (Powder Metallurgy) 81 (CHEMICAL PROCESS INDUSTRIES); 80 (CHEMICAL ENGINEERING); 53 (METALLURGICAL ENGINEERING) Y029008 20 1448745 E I. Monthly No: EI8501007446 TUNDISH NOZZLE CONSTRICTION IN CONTINUOUS CASTING OF TITANIUM BEARING STAINLESS STEEL SLABS. Hasegawa, Morihiro; Maruhashi, Shigeaki; Kamidate, Yoshioki; Muranaka, Yutaka; Hoshi, Fumio Nisshin Steel Co, Shunan Research & Development Lab, Shinnanyo, Jpn Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan v 70 n 14 Oct 1984 p 1704-1711 CODEN: TEHAA2 ISSN: 0021-1575 Lang.: JAPANESE Doc. Type: JA; (Jrnl Art.) Treatment: X; (Experimental) Constriction becomes more severe as the percentage of alumina in the molten steel increases. The origin of titanium nitride and alumina particles are denitrification and deoxidation products in the molten steel. Alumina from the nozzle refractory and the reaction between aluminua in the steel and silica in the refractory also contribute to buildup. 25 refs. In Japanese with English abstract. Desc.: *STAINLESS STEEL--*Continuous Casting Ident.: TUNDISH NOZZLE CONSTRICTION Class. Codes: 545 (Iron & Steel); 534 (Foundry Practice) 54 (METAL GROUPS); 53 (METALLURGICAL ENGINEERING) Y029008 21 1439545 E.I. Monthly No: EI8408078710 E.I. Yearly No: EI84062236 ENERGY CONSERVATION IN INDUSTRY - APPLICATIONS AND TECHNIQUES, PROCEEDINGS OF THE CONTRACTORS' MEETINGS, 1982. Ehringer, Hermann (Ed. ); Hoyaux, G. (Ed. ); Pilavachi, Petros A. (Ed. ) Commission of the European Communities, Brussels, Belg Comm Eur Communities Rep EUR 8436, Energy Conserv in Ind Appl and Tech, Proc of the Contract Meet, Brussels, Belg, May 10, Jun 17, Oct 1, 7 and 22 1982. Publ by D. Reiel Publ Co, Dordrecht, Neth and Boston, Mass, USA, 1983 425p CODEN: CECED9 For individual papers see E.I. Conference No.: 04147 in file 165 Lang.: Eng. This conference proceedings contains 29 papers. Energy conservation aspects in various industries are covered. The topics cover the metallurgical, cement and glass ceramic, textile, food, and chemical industries. Other topics cover catalysis, microwave heating applications and energy management. Three papers are in French, the rest is English. Technical and professional papers from this conference are indexed with the conference code no. 04147 in the Ei Engineering Meetings (TM) database produced by Engineering Information, Inc. Desc.: *INDUSTRIAL PLANTS--*Energy Conservation; FORGINGS; CERAMIC MATERIALS; STEEL CASTINGS; TEXTILES; VEGETABLE OILS--Extraction Ident.: EIREV Class. Codes: 901 (Engineering Profession); 535 (Rolling, Forging & Forming); 812 (Ceramics & Refractories); 545 (Iron & Steel); 819 (Textile & Fiber Technology); 822 (Food Technology) 90 (GENERAL ENGINEERING); 53 (METALLURGICAL ENGINEERING); 81 (CHEMICAL PROCESS INDUSTRIES); 54 (METAL GROUPS); 82 (AGRICULTURE & FOOD TECHNOLOGY) Y029008 22 147501 E.I. Monthly No: EI8404029573 E.I. Yearly No: EI84015648 DIELECTRIC PROPERTIES OF SrTiO//3 GLASS-CERAMICS. Swartz, S. L.; Lanagan, M. T.; Schulze, W. A.; Cross, L. E.; Lawless, W. N. Pennsylvania State Univ, Materials Research Lab, University Park, Pa, USA Ferroelectrics v 50 n 1-4 Nov 1983, IEEE Int Symp on Appl of Ferroelectr (ISF) 1983, Pt 2, Gaithersburg, Md, USA, Jun 1-3 1983 p 313-318 CODEN: FEROA8 ISSN: 0015-0193 Lang.: Eng. Strontium titanate glass-ceramics have been investigated for possible application as low-loss dielectric materials at microwave and millimeter wave frequencies. Under suitable crystallization conditions, these glass-ceramics exhibit temperature compensated dielectric permittivity, a consequence of the balance between the negative temperature coefficient of the SrTiO//3 crystalline phase and the positive temperature coefficient of the residual alumino-silicate glass phase. Temperature coefficients of less than 10 ppm/ DEGREE C with dielectric constants in the range of 16-18 have been achieved over a temperature range of MINUS 55 to 125 DEGREE C. Dielectric losses at frequencies up to 4 MHz are extremely low (tan DELTA < 0. 0005). However, the losses increase as the frequency approaches the millimeter wave region, indicating that these glass-ceramics might not be acceptable as millimeter wave dielectrics. 7 refs. Desc.: *CERAMIC MATERIALS--*Ferroelectric; DIELECTRIC PROPERTIES; STRONTIUM COMPOUNDS Ident.: STRONTIUM TITANATE Class. Codes: 708 (Electric & Magnetic Materials); 812 (Ceramics & Refractories); 701 (Electricity & Magnetism); 804 (Chemical Products) 70 (ELECTRICAL ENGINEERING); 81 (CHEMICAL PROCESS INDUSTRIES); 80 (CHEMICAL ENGINEERING) Y029008 23 1437429 E.I. Monthly No: EI8404036450 E.I. Yearly No: EI84106961 CERAMICS FOR MICROWAVE DIELECTRIC RESONATOR. Nomura, Shoichiro Tokyo Inst of Technology, Dep of Physical Electronics, Tokyo, Jpn Ferroelectrics v 49 n 1-4 Nov 1983, IEEE Int Symp on Appl of Ferroelect (ISAF) 1983, pt 1, Gaithersburg, Md, USA, Jun 1-3 1983 p 61-70 CODEN: FEROA8 ISSN: 0015-0193 Lang.: Eng. The present investigation relates ceramics with a temperature-stable high dielectric constant and low dielectric loss, suitable for use in dialectric resonators in an SHF band. A small amount of Mn addition not only favorably affects sinterbility of ceramics but also advantageously heightens the unloaded Q. A value of Q higher than 10**4 is obtained in 10 GHz band. 12 refs. Desc.: *RESONATORS; MICROWAVE DEVICES; CERAMIC MATERIALS; DIELECTRIC MATERIALS; BARIUM COMPOUND; ZIRCONIUM COMPOUNDS Ident.: BARIUM TITANATE; ZIRCONIUM TIN TITANATE Class. Codes: 714 (Electronic Components); 715 (General Electronic Equipment); 708 (Electric & Magnetic Materials); 812 (Ceramics & Refractories); 804 (Chemical Products) 71 (ELECTRONICS & COMMUNICATIONS); 70 (ELECTRICAL ENGINEERING); 81 (CHEMICAL PROCESS INDUSTRIES); 80 (CHEMICAL ENGINEERING) Y029008 24 1436463 E.I. Monthly No: EI8403025557 E.I. Yearly No: EI84101360 NEW MULTILAYER PRINTED SUBSTRATE FOR HIGH FREQUENCY DEVICES. Nomura, T.; Nonomura, T.; Mayumi, S. Narumi China Corp, Nagoya, Jpn International Journal for Hybrid Microelectronics v 6 n 1, Int Microelectron Symp, 1983, Philadelphia, Pa, USA, Oct 31-Nov 2 1983 p 616-620 CODEN: IMICDJ Lang.: Eng. Recently, Ceramic Multilayer Substrates have been widely used in high frequency devices such as microwave communication equipment, TV and FM turners, and CATV converters. Co-fired multilayer technology is generally utilized in the production of Side Brazed Packages and Ceramic Chip Carriers, where several sheets of 'Green Ceramics' are printed, stacked and fired to form the package. Since the late 1960's the authors have been investigating not only co-fired multilayer substrates but also co-fired multilayer printed substrates (MPS). The MPS was produced by printing of metal conductive layers (Tungsten) and insulating layers of ceramics (94% Alumina) alternately on sheet of 'Green Ceramics' followed by firing in a wet hydrogen atmosphere. A low impedance substrate is described which was copper-metallized on both sides and had through holes, sintered tungsten filled. Desc.: *PRINTED CIRCUITS--*Manufacture; TELEVISION RECEIVERS-- Tuners Ident.: HF DEVICES Class. Codes: 703 (Electric Circuits); 713 (Electronic Circuits); 714 (Electronic Components); 716 (Radar, Radio & TV Electronic Equipment); 812 (Ceramics & Refractories) 70 (ELECTRICAL ENGINEERING); 71 (ELECTRONICS & COMMUNICATIONS); 81 (CHEMICAL PROCESS INDUSTRIES) Y029008 25 1434056 E.I. Monthly No: EI8412134458 E.I. Yearly No: EI84080591 MECHANICAL RELIABILITY OF CERAMIC WINDOWS IN HIGH FREQUENCY MICROWAVE HEATING DEVICES - PART 2: MECHANICAL BEHAVIOUR OF THE CERAMICS. Becher, P. F.; Ferber, M. K. Oak Ridge Natl Lab, Metals & Ceramics Div, Oak Ridge, Tenn, USA Journal of Materials Science v 19 n 11 Nov 1984 p 3778-3785 CODEN: JMTSAS ISSN: 0022-2461 Lang.: Eng. Mechanical reliability was evaluated for the specific alumina and beryllia ceramics now used as microwave windows in the high-power high-frequency gyrotron tubes being developed for plasma heating in fusion systems. Both the static fatigue behavior in the fluorocarbon fluid used to cool gyrotron windows and the inert strength distributions for these two ceramics were characterized. These data were then analyzed in order to construct reliability diagrams for these two materials, which are discussed in the paper. 13 refs. Desc.: *MICROWAVE DEVICES; GYROTRONS; CERAMIC MATERIALS--Mechanical Properties Class. Codes: 714 (Electronic Components); 715 (General Electronic Equipment); 812 (Ceramics & Refractories); 421 (Materials Properties) 71 (ELECTRONICS & COMMUNICATIONS); 81 (CHEMICAL PROCESS INDUSTRIES); 42 (MATERIALS PROPERTIES & TESTING) Y029008 26 1434055 E.I. Monthly No: EI8412134457 E.I. Yearly No: EI84080590 MECHANICAL RELIABILITY OF CERAMIC WINDOWS IN HIGH FREQUENCY MICROWAVE HEATING DEVICES - PART 1: AN ANALYSIS OF TEMPERATURE AND STRESS DISTRIBUTIONS. Ferber, M. K.; Kimrey, H. D.; Becher, P. F. Oak Ridge Natl Lab, Metals & Ceramics Div, Oak Ridge, Tenn, USA Journal of Materials Science v 19 n 11 Nov 1984 p 3767-3777 CODEN: JMTSAS ISSN: 0022-2461 Lang.: Eng. The temperature and stress distributions generated in ceramic window materials currently employed in microwave gyrotron tubes were determined for a variety of operating conditions. First, a computer program was used to determine the electric field distribution within the window at a given power level and frequency. This program was capable of describing both the radial and axial dependence of the electric field. Second, the field distribution was used to derive an expression of the heat generated per unit volume per unit time within the window due to dielectric losses. A generalized heat conduction computer code was then used to compute the temperature distribution based on the heat generation function. Finally, the stresses wwre determined from the temperature profiles using a finite-element computer program. 18 refs. Desc.: *MICROWAVE DEVICES; CERAMIC MATERIALS--Mechanical Properties ; GYROTRONS Class. Codes: 714 (Electronic Components); 715 (General Electronic Equipment); 812 (Ceramics & Refractories); 421 (Materials Properties) 71 (ELECTRONICS & COMMUNICATIONS); 81 (CHEMICAL PROCESS INDUSTRIES); 42 (MATERIALS PROPERTIES & TESTING) Y029008 27 1424745 E.I. Monthly No: EI8412131128 E.I. Yearly No: EI84046223 MICROSTRUCTURE AND SPIN WAVE SCATTERING IN POLYCRYSTALLINE YTTRIUM IRON GARNET. Saraswati, V.; Multani, M. S.; Palar, V. R.; Vijayaraghavan, R.; Gurjar, A. Tata Inst of Fundamental Research, Bombay, India Journal of Magnetism and Magnetic Materials v 43 n 3 Aug 1984 p 256-260 CODEN: JMMMDC ISSN: 0304-8853 Lang.: Eng. Yterium Iron Garnet (YIG) is a microwave ferrite which in polycrystalline form has specific characteristics. Highly dense (above 99% theoretical density) YIG of submicron and micron grain size are obtained using sol-gel method for the preparation of YIG powder and sintering of the compacts at high pressures ( APPROX EQUALS 2000 kg/cm**2). The grain size dependence of the microwave properties was studied. Present observations on ferrimagnetic resonance linewidths, magnetization, susceptibility and spin wave instability threshold fields are reported. 13 refs. Desc.: *FERRITES--*Magnetic Properties; YTTRIUM COMPOUNDS--Garnets MAGNETISM--Ferrimagnetism; MAGNETIZATION Ident.: SPIN WAVES Class. Codes: 708 (Electric & Magnetic Materials); 701 (Electricity & Magnetism) 70 (ELECTRICAL ENGINEERING) Y029008 28 1412334 E.I. Monthly No: EI8411125494 E.I. Yearly No: EI84131325 GROWTH OF TITANIUM CARBIDE WHISKERS AND MEASUREMENTS OF THEIR MECHANICAL PROPERTIES. Kadota, Masatane; Kato, Ken; Oura, Toru; Hayami, Ryozo Government Industrial Research Inst, Osaka, Jpn Zairyo/Journal of the Society of Materials Science, Japan v 32 n 362 Nov 1983 p 1248-1253 CODEN: ZARYAQ ISSN: 0514-5163 Lang.: JAPANESE Titanium carbide whiskers were prepared on a graphite substrate at 1250 DEGREE C by CVD method using TiCl//4, CO and H//2, and the factors affecting growth of the whiskers were investigated. The presence of nucleating agents on the substrate significantly promote the growth, and PtCl//4 is most effective. X-ray diffraction reveals that the whiskers are titanium carbide grown in the direction of < 111 > and < 100 > . Coating of the whiskers with Si and Pt was performed by sputtering. Sputtered Ni on the whiskers appeared as small droplets, whereas sputtered Pt was very smooth. The tensile strength of the whiskers varies with whisker size similar to those reported on alumina whiskers. The elastic moduli also vary which may be due to the tapered shape of the whiskers. The effect of coating on the tensile strength and elastic modulus are not significant. 13 refs. In Japanese with English abstract. Desc.: *TITANIUM CARBIDE CRYSTALS--Whiskers; CERAMIC MATERIALS-- Mechanical Properties Class. Codes: 804 (Chemical Products); 53? (Powder Metallurgy) 812 (Ceramics & Refractories) 80 (CHEMICAL ENGINEERING); 53 (METALLURGICAL ENGINEERING); 81 (CHEMICAL PROCESS INDUSTRIES) Y029008 29 1410704 E.I. Monthly No: EI8411124477 E.I. Yearly No: EI84121138 SIMPLE MODEL FOR MEASUREMENTS OF THE PHOTOACOUSTIC SIGNAL BY A PIEZOELECTRIC DETECTOR IN THE MICROWAVE REGION. Tronconi, A. L.; Amato, M. A.; Morais, P. C.; Skeff Neto, K. Univ de Brasilia, Grupo de Fisica Molecular e Magnetismo, Brasilia, Braz Journal of Applied Physics v 56 n 5 Sep 1 1984 p 1462-1464 CODEN: JAPIAU ISSN: 0021-8979 Lang.: Eng. Piezoelectric detection of the photoacoustic signal in the microwave region using barium titanate as a detector is carried out. The results in the low modulation frequency (below 30 Hz) are fitted very well by White's theory. For frequencies above 70 Hz a new and simple theory is presented. The effectiveness of this technique is demonstrated in the detection of the ferromagnetic resonance. 13 refs. Desc.: *SPECTROSCOPY, ACOUSTIC; MICROWAVES; PIEZOELECTRIC MATERIALS ; BARIUM COMPOUNDS Ident.: BARIUM TITANATE Class. Codes: 931 (Applied Physics); 711 (Electromagnetic Waves); 708 (Electric & Magnetic Materials); 804 (Chemical Products) 93 (ENGINEERING PHYSICS); 71 (ELECTRONICS & COMMUNICATIONS); 70 (ELECTRICAL ENGINEERING); 80 (CHEMICAL ENGINEERING) Y029008 30 1402491 E.I. Monthly No: EI8410100474 E.I. Yearly No: EI84015792 THORMA-URANIA POWDERS PREPARED VIA BULK MICROWAVE DENITRATION. Palmer, Brad J. F.; Bahen, Larry E.; Celli, Adelio ECL, Chalk River, Ont, Can American Ceramic Society Bulletin v 63 n 8 Aug 1984 p 1030-1034 CODEN: ACSBA7 ISSN: 0002-7812 Lang.: Eng. This paper describes work done using microwaves as the heat source for the denitration of thorium-uranyl nitrate solutions. In a remote environment, microwave heating has an advantage over resistance heating in that the need to replace heating elements is eliminated. For some systems microwave heating has a more important advantage. If, as is the case for thoria, microwaves do not couple strongly with the oxide, energy can be transmitted through regions of dried powder and deposited within unreacted material. 5 refs. Desc.: *CERAMIC MATERIALS--*Processing Class. Codes: 812 (Ceramics & Refractories) 81 (CHEMICAL PROCESS INDUSTRIES) Y029008 31 1396964 E.I. Monthly No: EI8410109393 E.I. Yearly No: EI84105999 FORMATION OF SILICON OXINITRIDE FROM Si//3N//4 AND SiO//2 IN THE PRESENCE OF Al//2O//3. Huang, Z. K.; Greil, P.; Petzow, G. Max-Planck-Inst fuer Metallforschung, Pulvermetallurgisches Lab, Stuttgart, West Ger Ceramics International v 10 n 1 Jan-Mar 1984 p 14-17 CODEN: CINNDH ISSN: 0272-8842 Lang.: Eng. The present investigation was aimed to determine the melting temperature of the SiO//2-Si//2N//2O eutectic and to describe the formation of Si//2N//2O from Si//3N//4 and SiO//2, the resulting microstructure and high temperature strength up to 1573 K. The oxidation experiments were conducted in air at 1573 K in a tube furnace up to 120 h. The weight variations of the specimens were measured after cooling to room temperature using a microbalance. 15 refs. Desc.: *REFRACTORY MATERIALS--*Silicon Nitride; ALUMINA--Sintered Class. Codes: 812 (Ceramics & Refractories) 81 (CHEMICAL PROCESS INDUSTRIES) Y029008 32 1393319 E.I. Monthly No: EI8409095692 E.I. Yearly No: EI84107002 HIGH-PERFORMANCE COAXIAL EPR CAVITY FOR INVESTIGATIONS AT ELEVATED TEMPERATURES AND PRESSURES. Goldberg, Ira B.; McKinney, Ted M. Rockwell Int Science Cent, Thousand Oaks, Calif, USA Review of Scientific Instruments v 55 n 7 Jul 1984 p 1104-1110 CODEN: RSINAK ISSN: 0034-6748 Lang.: Eng. A microwave cavity suitable for heating a sample to temperatures above 800 DEGREE C within 15 s at gas pressures above 17. 5 MPa is reported. The cavity is coaxial and operates in the TE//0//1//1 mode at frequencies between 9 and 10 GHz. The heating element is constructed of nickel-chromium (i. e. , Chromel) wire. It consists of two concentric helices wound in opposite senses (directions) and connected in series so as to minimize the magnetic field generated by the heater current. The heater is potted in magnesium oxide phosphate ceramic and placed inside of a cylinder made from 50- MU m copper foil which provides uniform temperature distribution and shields the heater from the microwave field. This assembly then serves as the heating element and the coaxial conductor of the cavity. The diameter of the coaxial heater assembly is approximately 7 mm. 31 refs. Desc.: *RESONATORS, CAVITY; SPECTROMETERS, MAGNETIC RESONANCE-- Accessories Class. Codes: 714 (Electronic Components); 715 (General Electronic Equipment) 71 (ELECTRONICS & COMMUNICATIONS) Y029008 33 1385383 E.I. Monthly No: EI8409086410 E.I. Yearly No: EI84005166 VOLATILIZATION OF ALUMINUM OXYCARBIDES AND OF ALUMINA WITH CARBON IN REDUCTION OF ALUMINA. Yokokawa, Harumi; Fujishige, Masao; Ujiie, Seiichi; Kameyama, Tetsuya; Dokiya, Masayuki; Fukuda, Kenzo Natl Chemical Lab for Industry, Tsukuba, Jpn Transactions of the Japan Institute of Metals v 25 n 3 Mar 1984 p 187-196 CODEN: TJIMAA ISSN: 0021-4434 Lang.: Eng. Volatilization in the Al-O-C (-Si-Fe) system has been investigated by thermal gravimetry in vacuum for aluminum oxycarbides, mixtures of alumina and carbon with and without additives (iron oxide, silicon nitride and silicon carbide), mixtures of alumina and aluminum carbide or silicon carbide and mixtures of alumina, silica (mullite), iron oxide and carbon. Al//2OC evaporated congruently, whereas Al//4O//4C evaporated incongruently; ALPHA -Al//2O//3 was formed in addition to vapors. The volatilization reaction between alumina and carbon was enhanced when iron was added, unchanged by SiC addition and prevented slightly in the presence of Si//3N//4. These features are discussed in terms of equilibrium pressure. 14 refs. Desc.: *ALUMINUM METALLURGY--*Physical Chemistry Class. Codes: 531 (Metallurgy & Metallography); 541 (Aluminum & Alloys) 53 (METALLURGICAL ENGINEERING) 54 (METAL GROUPS) Y029008 34 1383826 E.I. Monthly No: EI8408075941 E.I. Yearly No: EI84030681 NEW-GENERATION CERAMICS CUT COSTS. Coleman, John R. Tooling & Production, Solon, Ohio, USA Tooling & Production v 50 n 2 May 1984 p 46-49 CODEN: TOPRAR ISSN: 0040-9243 Lang.: Eng. Silicon nitride, sialon, and the new alumina-based compositions are rapidly shedding the stigma of unreliability associated with solid-ceramic tools of a few years ago. Although application sensitive, this latest generation of cutting-tool materials offers extraordinary production economies. Silicon nitride (Si//3N//4) is a new-generation ceramic that has high fracture toughness, hot hardness, and thermal-shock resistance. Its resistance to flank wear, however, is much lower than competitive aluminum-oxide (Al//2O//3) materials. Sialon (silicon-aluminum-oxygen-nitr- ogen) is a special member of the silicon-nitride-based family of ceramics. The material, and all its variants, has a lower coefficient of thermal expansion and high thermal conductivity than conventional alumina-based materials. In fact, the aluminas have approximately one third the thermal-shock factor of sialon. Sialon's calculated thermal-shock factor even exceeds that of C2 carbide, which explains why it's the material of choice for milling superalloys. The new alumina-based compositions are transformation-controlled through the dispersion of zirconium particles in the alumina matrix, thus effectively increasing the fracture toughness of the material. Desc.: *CUTTING TOOLS--*Ceramic Class. Codes: 603 (Machine Tools) 60 (MECHANICAL ENGINEERING) Y029008 35 1368412 E.I. Monthly No: EI8407071661 E.I. Yearly No: EI84119682 OVERVIEW OF THICK FILM HYBRID MATERIALS. Hoffman, Lewis C. Hoffman Associates Inc, Riviera Beach, Fla, USA American Ceramic Society Bulletin v 63 n 4 Apr 1984 p 572-576 CODEN: ACSBA7 ISSN: 0002-7812 Lang.: ENGLISH Thick film conductors for hybrids are dispersions of finely divided metals and inorganic binders in a temporary organic vehicle. They are usually applied to the substrates by screen-stencil printing, dried and fired in belt furnaces, to integrate the inorganic solids with the substrate. The organic vehicle disappears in an early stage of firing. Conductors interconnect passive and active devices on substrates. They must possess high conductivity at frequencies from dc through radio frequencies into the microwave region and beyond to millimeter waves. 60 refs. Desc.: *SOLID STATE DEVICES, THICK FILM--*Materials; CERAMIC MATERIALS--Electronic Properties Class. Codes: 714 (Electronic Components); 812 (Ceramics & Refractories) 71 (ELECTRONICS & COMMUNICATIONS); 81 (CHEMICAL PROCESS INDUSTRIES) Y029008 36 1366093 E.I. Monthly No: EI8407062746 E.I Yearly No: EI84015579 APPLICATIONS OF DIELECTRIC CERAMICS FOR MICROWAVE DEVICES. Kawashima, Shunichiro; Eguchi, Kazuhiro; Noguchi, Toshiharu; Ouchi, Hiromu Matsushita Electric Industrial Co, Central Research Lab, Morguchi, Jpn Natl Tech Rep Matsushita Electr Ind v 30 n 1 Feb 1984 p 175-185 CODEN: NTROAV ISSN: 0028-0291 Lang.: JAPANESE Recently microwave communication systems and broadcasting systems such as mobile telephones and satellite broadcasting have been widely developed, and applications of dielectric resonators to microwave devices have been increasing. To satisfy the requirements of various devices at microwave frequencies, a series of dielectric ceramics is developed with a low dielectric loss, small temperature coefficient of resonant frequency and dielectric constants in the range of 30 to 90. Features of the three different type dielectric resonators: the TE//0//1// DELTA dielectric resonator, the coaxial resonator and the strip-line resonator composed of these ceramics are explained. The characteristics of the devices using dielectric resonators are summarized, and to make compact and highly stable devices at low cost is reported. 8 refs. In Japanese with English abstract. Desc.: CERAMIC MATERIALS--*Dielectric Properties; RESONATORS-- Microwaves; TELECOMMUNICATION LINKS, MICROWAVE Ident.: DIELECTRIC RESONATORS Class. Codes: 812 (Ceramics & Refractories); 714 (Electronic Components); 716 Radar, Radio & TV Electronic Equipment) 81 (CHEMICAL PROCESS INDUSTRIES); 71 (ELECTRONICS & COMMUNICATIONS) Y029008 37 1364561 E.I. Monthly No: EI8407062764 E.I. Yearly No: EI84015833 SINTERING AND PROPERTIES OF TITANIUM DIBORIDE MADE FROM POWDER SYNTHESIZED IN A PLASMA-ARC HEATER. Baumgartner, H. R.; Steiger, R. A. PG Industries Inc, Barberton, Ohio, USA Journal of the American Ceramic Society v 67 n 3 Mar 1984 p 207-212 CODEN: JACTAW ISSN: 0002-7820 Lang.: Eng. The pressureless sintering to near theoretical density of high-purity titanium diboride powder, produced in a plasma arc from halogen vapor reactants, is described. Physical and mechanical property measurements between 25 DEGREE and 1400 DEGREE C are reported. Titanium diboride exhibits several unusual and interesting properties, which include high electronic conductivity, a large positive strength-vs-temperature coefficient, and an intrinsic resistance to high-temperature slow crack growth. 37 refs. Desc.: *CERAMIC MATERIALS--*Sintering; TITANIUM COMPOUNDS-- Processing; POWDER METALLURGY--Sintering Ident.: TITANIUM DIBORIDE Class. Codes: 812 (Ceramics & Refractories); 804 (Chemical Products); 536 (Powder Metallurgy) 81 (CHEMICAL PROCESS INDUSTRIES); 80 (CHEMICAL ENGINEERING); 53 (METALLURGICAL ENGINEERING) Y029008 38 1362095 E.I. Monthly No: EI8407062200 E.I. Yearly No: EI84008502 DIELECTRIC CHARACTERIZATION OF Ba//2Ti//9O//2//0 TYPE CERAMICS AT MICROWAVE FREQUENCIES. Hennings, D.; Schnabel, P. Philips GmbH, Forschungslaboratorium Aachen, Aachen, West Ger Philips Journal of Research v 38 n 6 1983 p 295-311 CODEN: PHJRD9 ISSN 0165-5817 Lang.: Eng. Highly stable microwave oscillators require external stabilization e. g. by dielectric resonators. Low-loss Ba//2Ti//9O//2//0 type ceramics are suited for making such resonators. The stability of their respective eigenfrequencies OMEGA mainly depends on the temperature variation of the complex permittivity EPSILON = EPSILON //o ( EPSILON ' MINUS j EPSILON '' ) of the material used. To improve and control the relevant properties of dielectric ceramics demands an exact method for measuring EPSILON . In the frequency range of 4-1? GHz the resonance frequencies and widths of the resonance lines are measured with cylindrical specimens between to parallel metal plates. The effective quality factor of the resonant specimen is lowered by the losses in the metal plates which must be known exactly and are controlled by calibration measurements made with low-loss single crystals. The accuracy of the EPSILON -measurements and how it depends on the main experimental parameters is considered. The temperature coefficients of OMEGA are determined and related to variations in EPSILON ' and the thermal expansion. 7 refs. Desc.: *BARIUM TITANATE--*Dielectric Properties; CERAMIC MATERIALS Class. Codes: 812 (Ceramics & Refractories); 712 (Electronic & Thermionic Materials); 708 (Electric & Magnetic Materials); 701 (Electricity & Magnetism) 81 (CHEMICAL PROCESS INDUSTRIES); 71 (ELECTRONICS & COMMUNICATIONS); 70 (ELECTRICAL ENGINEERING) Y029008 39 1359704 E.I. Monthly No: EI8406051322 E.I. Yearly No: EI84015871 MICROWAVE HEATING OF NEPHELINE GLASS-CERAMICS. MacDowell, John F. Corning Glass Works, Research & Development Div, Corning, NY, USA American Ceramic Society Bulletin v 63 n 2 Feb 1984 p 282-286 CODEN: ACSBA7 ISSN: 0002-7812 Lang.: Eng. Microwave heating characteristics of nepheline glass-ceramics over a broad composition spectrum are described. Ability of the sodium ion in the larger nepheline lattice positions to couple with a microwave field is proposed to explain the unusually high temperatures achieved with these materials. Mixed alkali nephelines were found to couple much less than the sodium end-member. 11 refs. Desc.: *CERAMIC MATERIALS--*Thermal Properties; MICROWAVE DEVICES-- Materials Ident.: GLASS-CERAMICS; MICROWAVE OVENS Class. Codes: 812 (Ceramics & Refractories); 714 (Electronic Components); 715 (General Electronic Equipment) 81 (CHEMICAL PROCESS INDUSTRIES); 71 (ELECTRONICS & COMMUNICATIONS) Y029008 40 1354162 E.I. Monthly No: EI8406054872 E.I. Yearly No: EI84056218 LEAD-THROUGH SEALS INCORPORATING A FOAMED GLASS CERAMIC. Partridge, G. GEC Power Engineering Ltd, Stafford Lab, Stafford, Staffs, Engl Glass Technology v 24 n 6 Dec 1983 p 293-297 CODEN: GLSTAK ISSN: 0017-1050 Lang.: Eng. The dielecric properties of microwave components could be improved with better seals. It has been demonstrated that lead-through seals can be made incorporating a foamed Li//2O-Al//2O//3-SiO//2 glass ceramic bonded to a Si-Fe lead-through and a stainless steel outer component. The foam glass ceramic seals are leak-tight to helium and the dielectric constant of the foam can be as low as 2. 1 at microwave frequencies. 11 refs. Desc.: *GLASS MANUFACTURE--*Seals; SEALS--Bonding; MICROWAVE DEVICES--Seals Class. Codes: 812 (Ceramics & Refractories); 619 (Pipes, Tanks & Accessories); 714 (Electronic Components); 715 (General Electronic Equipment); 81 (CHEMICAL PROCESS INDUSTRIES); 61 (PLANT & POWER ENGINEERING); 71 (ELECTRONICS & COMMUNICATIONS) Y029008 41 134964 E.I. Monthly No: EI8405039235 E.I. Yearly No: EI84004927 TRANSMISSION ELECTRON MICROSCOPY OF Al-Cu BASE POWDER METALLURGICAL COMPOSITES. Jha, Amol Kumar; Ramchandran, Tiruvannamalai R.; Upadhyaya, Gopal Shankar Indian Inst of Technology, Kanpur, India Praktische Metallographie v 20 n 11 Nov 1983 p 562-569 CODEN: PMTLA5 ISSN: 0032-678X Lang.: Eng.; GERMAN The microstructure of Al-4. 4% Cu powder (MD 24) composites containing 4 vol. % dispersoids of tungsten carbide, ALPHA -alumina, titanium carbide-molybdenum carbide alloy and tribaloy has been studied by transmission electron microscopy after the composites have been sintered in nitrogen at 853 K, solution-treated at 783 K and then aged at 448 K for 8 h. The results show that there is no significant difference in the size distribution of THETA ' particles in the compacts containing MD 24, MD 24 and tungsten carbide, and MD 24 and alumina; those containing tribaloy and titanium carbide-molybdenum carbide reveal a high dislocation density in the matrix. 6 refs. In English and German. Desc.: *ALUMINUM COPPER ALLOYS--*Metallic Matrix Composites; COMPOSITE MATERIALS--Microscopic Examination; METALLOGRAPHY-- Microstructures; POWDER METALLURGY--Aluminum Copper Class. Codes: 541 (Aluminum & Alloys); 544 (Copper & Alloys); 741 (Optics & Optical Devices); 531 (Metallurgy & Metallography); 536 (Powder Metallurgy) 54 (METAL GROUPS); 74 (OPTICAL TECHNOLOGY); 53 (METALLURGICAL ENGINEERING) Y029008 42 1335985 E.I. Monthly No: EI8404036391 E.I. Yearly No: EI84105982 SUBSOLIDUS PHASE RELATIONSHIPS IN THE SYSTEM Y//2O//3-Al//2O//3: AlN-Si//- 3N//4. Sun, Wei-Ying; Huang, Zhen-Kun; Cheng, Jian-Xin Shanghai Inst of Ceramics, Shanghai, China Transactions and Journal of the British Ceramic Society v 82 n 5 Sep-Oct 1983 p 173-175 CODEN: TJBCAD ISSN: 0007-0394 Lang.: Eng. A tentative phase diagram of the system is postulated, in which there are four two-phase regions containing solid solutions and three triangles. 4 refs. Desc.: *REFRACTORY MATERIALS--*Silicon Nitride; ALUMINA--Processing Class. Codes: 812 (Ceramics & Refractories) 81 (CHEMICAL PROCESS INDUSTRIES) Y029008 43 1332280 E.I. Monthly No: EI8404037185 E.I. Yearly No: EI84117297 MECHANICAL, THERMAL, AND MICROSTRUCTURAL PROPERTIES OF NEUTRON IRRADIATED SiC. Corelli, J. C.; Hoole, J.; Lazzaro, J.; Lee, C. W. Rensselaer Polytechnic Inst, Dep of Nuclear Engineering, Troy, NY, USA Journal of the American Ceramic Society v 66 n 7 Jul 1983 p 529-537 CODEN: JACTAW ISSN: 0002-7820 Lang.: Eng. The thermal and electrical conductivities, fracture strength, swelling, and microstructure of sintered alpha-phase SiC and siliconized reaction-bonded SiC materials were studied before and after irradiation with reactor neutrons. Electrical, mechanical, and thermal properties exhibit partial recovery after heat treatment to 1000 to 1500 K. An overall consistency is observed in radiation-produced property changes and annealing and a model is presented to explain the changes. 28 refs. Desc.: *SILICON CARBIDE--*Electric Conductivity; CRYSTALS-- Microstructure; PHYSICS--Solid State Ident.: PLASMA LIMITER; NEUTRON IRRADIATED SILICON CARBIDE Class. Codes: 712 (Electronic & Thermionic Materials); 804 (Chemical Products); 701 (Electricity & Magnetism); 932 (High Energy, Nuclear & Plasma Physics); 622 (Radioactive Materials) 71 (ELECTRONICS & COMMUNICATIONS); 80 (CHEMICAL ENGINEERING); 70 (ELECTRICAL ENGINEERING); 93 (ENGINEERING PHYSICS); 6? (NUCLEAR TECHNOLOGY) Y029008 44 1305705 E.I. Monthly No: EI8401004981 E.I. Yearly No: EI84077896 TOOL MATERIALS. Coleman, John R. Tooling & Production, Solon, Ohio, USA Tooling & Production v 49 n 5 Aug 1983 p 19-24, 29-31 CODEN: TOPRAR ISSN: 0040-9243 Lang.: Eng. This paper deals with the cutting of difficult materials with synthetic diamond and cubic boron nitride tools, as well as with tools made of silicon nitride based ceramics. In addition, the use of alumina based ceramics for the turing of hardened steels is discussed. The use of new innovative turning tools such as the ledge insert and the rotary tool is evaluated. Research on the use of laser-assisted machining in tough turning operations is described. Desc.: *METAL CUTTING; CUTTING TOOLS Class. Codes: 604 (Metal Cutting & Machining); 603 (Machine Tools) 60 (MECHANICAL ENGINEERING) Y029008 45 1305533 E.I. Monthly No: EI8401007039 E.I. Yearly No: EI84106967 MINIATURIZED COAXIAL RESONATOR PARTIALLY LOADED WITH HIGH-DIELECTRIC-CONSTANT MICROWAVE CERAMICS. Yamashita, Sadahiko; Makimoko, Mitsuo Matsushita Research Inst Tokyo, Inc, Kawasaki, Jpn IEEE Transactions on Microwave Theory and Techniques v MTT-31 pt 1 n 9 Sep 1983 p 697-703 CODEN: IETMAB ISSN: 0018-9480 Lang.: Eng. A partially dielectric-filled stepped impedance resonator (PDSIR) is introduced as a class of a miniaturized coaxial resonator. The length of this resonator is less than that of a fully dielectric-filled quarter-wavelength resonator. The conditions for obtaining resonance with a high dielectric constant of EPSILON //r = 35 or 85, sensitivity analysis, and temperature drift of the resonant frequency, are described. The spurious response, in which the characteristics are better than for a conventional quarter-wavelength resonator, is also analyzed. 12 refs. Desc.: *RESONATORS--*Design Ident.: PARTIALLY DIELECTRIC-FILLED IMPEDANCE RESONATOR (PDSIR); MINIATURE COAXIAL RESONATOR Class. Codes: 714 (Electronic Components) 71 (ELECTRONICS & COMMUNICATIONS) Y029008 46 1303785 E.I. Monthly No: EI8312099688 E.I. Yearly No: EI83011460 PROCEEDINGS OF THE BRITISH CERAMIC SOCIETY: ENGINEERING WITH CERAMICS, 1981. Davidge, Roger W. (Ed. ) AERE, Harwell, Engl Proceedings of the British Ceramic Society n 32 Mar 1982, Eng with Ceram, London, Engl, Dec 15-17 1981. Publ by the British Ceramic Soc, Stoke-on-Trent, Engl, 1982 400p CODEN: PBRCAR ISSN: 0524-5141 For individual papers see E.I. Conference No.: 02626 in file 165 Lang.: Eng. This meeting proceedings contains 32 papers on engineering with ceramics, and focuses on a merging of the disciplines of materials science and engineering science in the ceramics field. A good number of papers describes the fabrication and properties of new types of ceramics. The fabrication experts have now developed a number of silicon based ceramics-nitride, carbide and sialons - which can be made by fairly straightforward sintering routes to give materials with bend strengths of typically 1 GPa. Technical and professional papers from this conference are indexed with the conference code no. 02626 in the Ei Engineering Meetings (TM) database produced by Engineering Information, Inc. Desc.: *CERAMIC MATERIALS; CERAMIC PRODUCTS--Manufacture Ident.: EIREV; POWDER CHARACTERISTICS; COMMERCIAL ALUMINA CERAMICS; SILICON NITRIDE CERAMICS; SUBCRITICAL CRACK EXTENSION IN CERAMICS Class. Codes: 812 (Ceramics & Refractories); 804 (Chemical Products); 421 (Materials Properties); 612 (Combustion Engines); 712 (Electronic & Thermionic Materials); 537 (Heat Treatment); 81 (CHEMICAL PROCESS INDUSTRIES); 80 (CHEMICAL ENGINEERING); 42 (MATERIALS PROPERTIES & TESTING); 61 (PLANT & POWER ENGINEERING); 71 (ELECTRONICS & COMMUNICATIONS); 53 (METALLURGICAL ENGINEERING) Y029008 47 1303058 E.I Monthly No: EI8311097339 E.I. Yearly No: EI83088864 INVESTIGATION OF THE CHEMICAL BONDING OF Cr AND Ti TO SILICON NITRIDE. Orent, T. W.; Wagner, R. A. Honeywell Corporate Technology Cent, Bloomington, Minn, USA Journal of Vacuum Science & Technology B: Microelectronics Processing and Phenomena v 1 n 3 Jul-Sep 1983 p 844-849 CODEN: JVTBD9 ISSN: 0734-211X Lang.: Eng. The adhesion characteristics of rf-sputtered Cr/Cu and Ti/Cu films to polished silicon nitride substrates were studied. As-deposited samples showed lower rupture strengths than Cr/Cu on unpolished alumina, but Ti samples that had been annealed above 500 DEGREE C and Cr films on substrates that had been prefired in air had higher rupture strengths than Cr/Al//2O//3. The compositions of the metal substrate interfacial regions were studied by Auger depth profiling and by x-ray photoelectron spectroscopy, and the results were correlated with the adhesion measurements. Chromium did not react extensively with the substrate during deposition, but it did react with the silicon oxynitride surface layer formed during prefiring. On the other hand, Ti reduced the silicon nitride during deposition to produce TiN and free Si. Above 500 DEGREE C the free silicon reacted with additional Ti at the Ti/TiN interface to form a silicide. 15 refs. Desc.: *SILICON COMPOUNDS; INTEGRATED CIRCUITS--Metallizing; CHROMIUM COPPER ALLOYS; TITANIUM COPPER ALLOYS Class. Codes: 804 (Chemical Products); 713 (Electronic Circuits); 714 (Electronic Components); 543 (Chromium, Manganese, Molybdenum, Tantalum, Tungsten, Vanadium & Alloys); 544 (Copper & Alloys) 80 (CHEMICAL ENGINEERING); 71 (ELECTRONICS & COMMUNICATIONS); 54 (METAL GROUPS) Y029008 48 1301209 E.I. Monthly No: I8310082117 E.I. Yearly No: EI83012765 KINETICS OF HYDROCARBON AND HYDROGEN REACTION AT SOLID AND LIQUID Al//2O//3 SURFACES. Nordine, Paul C.; Essandoh, Louis; Abrevaya, Hayim Yale Univ, Dep of Chemical Engineering, New Haven, Conn, USA High Temperatures - High Pressures v 14 n 6 1982, IUPAC Conf on the Chem of Mater at High Temp, Harwell, Engl, Sep 7-10 1981 p 687-694 CODEN: HTHPAK ISSN: 0018-1544 Lang.: Eng. Rates were measured for the reaction of solid and liquid Al//2O//3, at 2327 K, with H//2, CH//4, C//6H//6, and the atomic and radical species produced by a microwave discharge in these gases. The method used cw CO//2 laser heating of sapphire filaments in a low-pressure flow reactor to obtain intrinsic rates for the evaporation or gasification reactions from recession rates of the partially molten specimen. Evaporation of Al//2O//3 is suppressed by hydrogen, more for the solid than for the liquid phase. Atomic hydrogen is about twenty times more effective in suppressing evaporation of alumina than is H//2. CH//4 (at 1. 35 Torr) produces no change in the evaporation rate of Al//2O//3. The CH//4-Al//2O//3 reaction probability is less than 10** MINUS **5. Benzene suppresses Al//2O//3 evaporation, but the suppression effect is eliminated if the sapphire specimen is preheated in argon at 2327 K. The CH//x radical-Al//2O//3 reaction probability is about 0. 07. Liquid: solid recession rate ratios decrease at the rate of evaporation and/or reaction increases. Refs. Desc.: *CHEMICAL REACTIONS--*Reaction Kinetics; ALUMINA-- Measurements Class. Codes: 802 (Chemical Apparatus & Plants); 812 (Ceramics & Refractories); 944 (Moisture, Pressure & Temperature, & Radiation Measuring Instruments) 80 (CHEMICAL ENGINEERING); 81 (CHEMICAL PROCESS INDUSTRIES); 94 (INSTRUMENTS & MEASUREMENT) Y029008 49 1299270 E.I. Monthly No: EI8309080274 E.I. Yearly No: EI83100512 DEUTERIUM TRAPPING IN LOW-Z COATINGS. Erents, S. K. EURATOM-UKAEA Fusion Assoc, Culham Lab, Abingdon, Oxfs, Engl Journal of Nuclear Materials v 111-112 Nov/Dec 1982, Plasma Surf Interact in Controlled Fusion Devices, Proc of the Int Conf, 5th, Gatlinburg, Tenn, USA, May 3-7 1982 p 590-597 CODEN: JNUMAM ISSN: 0022-3115 Lang.: Eng. Data selection is presented from a systematic study of deuteron trapping and deuterium re-emission during bombardment with monoenergetic ion beams in the energy range 50 ev-1keV per deuteron. Coatings investigated include plasma-sprayed alumina, alumina-titania, silicon, spinel and titanium dioxide. Co-sputtered titanium carbide was also studied. Measurements were made at a variety of sample temperatures in the range 300 K to 1100 K. The relevance of the data to tritium hold-up in the walls on JET is discussed. 15 refs. Desc.: *TOKAMAK DEVICES--*Materials; PROTECTIVE COATINGS; DEUTERIUM Class. Codes: 932 (High Energy, Nuclear & Plasma Physics); 539 (Metals Corrosion & Protection) 93 (ENGINEERING PHYSICS); 53 (METALLURGICAL ENGINEERING) Y029008 50 1295624 E.I. Monthly No: EI8312099694 E.I. Yearly No: EI83011494 EFFECT OF Mn DOPING ON THE DIELECTRIC PROPERTIES OF Ba//2Ti//9?//2//0 CERAMICS AT MICROWAVE FREQUENCY. Nomura, Shoichiro; Tomaya, Keiichiro; Kaneta, Kumiko Toyko Inst of Technology Ookoyama, Dep of Physical Electronics, Tokyo, Jpn Jpn J Appl Phys Part 1 v 22 n 7 Jul 1983 p 1125-1128 CODEN: JAPNDE Lang.: Eng. The effect of Mn doping on the dielectric properties of Ba//2Ti//9O//2//0 ceramics has been investigated at microwave frequency. The dielectric constant and the temperature coefficient are not sensitive to the addition of Mn, while the unloaded Q depends strongly upon it as well as on heat treatment at high temperature. A minute addition of Mn leads to an increase in the Q value. A high value of Q of more than 5200 was obtained at 9 GHz with the addition of 0. 5 to about 1. 0 mol % Mn. 9 refs. Desc.: *CERAMIC MATERIALS--*Dielectric Properties Ident.: BARIUM TITANATE CERAMICS Class. Codes: 812 (Ceramics & Refractories); 701 (Electricity & Magnetism) 81 (CHEMICAL PROCESS INDUSTRIES); 70 (ELECTRICAL ENGINEERING) Y029008 51 1285727 E.I. Monthly No: EI8311091502 E.I. Yearly No: EI83003748 APPLICATION OF WEAR-RESISTANT ALUMINA COATINGS ON HIGH SPEED STEELS BY rf-SPUTTERING. Fujiyama, Hirokazu; Kuwahara, Kaizo; Sumomogi, Tsunetaka Fukuoka Inst of Technology, Fukuoka, Jpn Journal of Japan Society of Lubrication Engineers v 28 n 3 1983 p 206-213 CODEN: JUNKAU ISSN: 0449-4156 Lang.: JAPANESE Alumina coatings were prepared by rf-sputtering on high speed steel tools made of SKH 57 and SKH 9. The following results were obtained in the turning test with these tools on S 45 C steel workpieces. (1) Highly wear-resistant alumina coatings were obtained by starting the sputtering at a substrate-tool temperature of 20 DEGREE C rather than starting at higher temperature; (2) alumina-coated SKH 57 tools showed more excellent performance than uncoated ones in the long tool life, easily disposable cutting chips and satisfacoty surface finish; (3) sputter-coating of alumina on SKH 57 tools caused similar cutting performance to that with the same tools ion-?lated with titanium nitride; and (3) use lives of tools made of insufficiently thermally resistant steels such as SKH 9 could also be improved with alumina coatings. In Japanese with English abstract. Desc.: *ALUMINA--*Wear; STEEL--Protective Coatings Class. Codes: 812 (Ceramics & Refractories); 421 (Materials Properties); 545 (Iron & Steel); 539 (Metals Corrosion & Protection) 81 (CHEMICAL PROCESS INDUSTRIES); 42 (MATERIALS PROPERTIES & TESTING); 54 (METAL GROUPS); 53 (METALLURGICAL ENGINEERING) Y029008 52 1281300 E.I. Monthly No: EI831008808 E.I. Yearly No: EI83080083 Q-FACTOR OF COAXIAL RESONATORS PARTIALLY LOADED WITH HIGH DIELECTRIC CONSTANT MICROWAVE CERAMICS. Yamashita, Sadahiko; Makimoto, Mitsuo Matsushita Research Inst Tokyo Inc, Kawasaki, Jpn IEEE Transactions on Microwave Theory and Techniques v MTT-31 n 6 Jun 1983 p 485-488 CODEN: IETMAB ISSN: 018-9480 Lang.: Eng. The quality factor of partially loaded dielectric coaxial stepped impedance resonators (PDSIR) has been analyzed, including analysis of the dielectric constant EPSILON //r and the dielectric loss tan DELTA of the ceramics. The Q-factor of several resonators is also calculated and compared with the experimental results. This shows that the Q-factor degradation lessens even though the resonator length becomes stall when the total length L//t > 1/ ROOT EPSILON //r and becomes large when L//t < 1/ ROOT EPSILON //r. 5 refs. Desc.: *RESONATORS--*Analysis; ELECTRIC MEASUREMENTS--Q Factor; CERAMIC MATERIALS--Microwaves; DIELECTRIC PROPERTIES Ident.: QUALITY FACTOR; DIELECTRIC COAXIAL IMPEDANCE RESONATOR Class. Codes: 714 (Electronic Components); 942 (Electrical & Electronic Measuring Instruments); 812 (Ceramics & Refractories); 711 (Electromagnetic Waves) 71 (ELECTRONICS & COMMUNICATIONS); 94 (INSTRUMENTS & MEASUREMENT); 81 (CHEMICAL PROCESS INDUSTRIES) Y029008 53 1279025 E.I. Monthly No: EI8310086284 E.I. Yearly No: EI83060302 ELECTRICAL PROPERTIES GOVERN SUBSTRATE EFFECTIVENESS. Borase, Vijay Materials Research Corp, Ceramic Substrate Div, Orangeburg, NY, USA Microwaves RF 22 n 2 Feb 1983 p 83, 85, 88 CODEN: MIRFDL Lang.: Eng. In microwave integrated circuits (MICs) and microstrip, the impedance of the circuit must be matched to the remainder of the system. MICs and microstrip circuits require substrates with consistent electrical properties, because the substrate actually becomes part of the circuit. The paper describes the progress in substrate manufacturing, the introduction of 99-to-99. 9-percent alumina ceramic, its dielectric properties and resistivity. 5 refs. Desc.: *MICROWAVE DEVICES--*Materials; INTEGRATED CIRCUITS, HYBRID --Microwaves Class. Codes: 714 (Electronic Components); 713 (Electronic Circuits) 71 (ELECTRONICS & COMMUNICATIONS) Y029008 54 1277749 E.I. Monthly No: EI831088009 E.I. Yearly No: EI83078904 RAILS MADE FROM STEEL DEOXIDIZED WITH Si-Mg-Ti ALLOY. Velikanov, A. V.; Kondrat'ev, V. Yu.; Maslov, A. M.; Glazov, V. I.; Polyakov, V. V.; Skvortsov, O. S. All-Union Scientific Research Inst of Rail Transport, USSR Steel in the USSR v 12 n 8 Aug 1982 p 385-388 CODEN: SUSRA5 ISSN: 0038-9218 Lang.: ENGLISH Use of the Si-Mg-Ti inoculant eliminated alumina and titanium nitride stringer type inclusions to be eliminated. The hypereutectoid steel has higher fatigue strength, satisfactory ductility and impact properties. 10 refs. Desc.: *RAILS--*Manufacture; STEEL--Mechanical Properties; STEELMAKING--Deoxidants; IRON AND STEEL METALLOGRAPHY--Inclusions Ident.: CONTACT FATIGUE Class. Codes: 681 (Railroad Plant & Structures); 535 (Rolling, Forging & Forming); 421 (Materials Properties); 545 (Iron & Steel); 531 (Metallurgy & Metallography); ?8 (RAILROAD ENGINEERING); 53 (METALLURGICAL ENGINEERING); 42 (MATERIALS PROPERTIES & TESTING); 54 (META GROUPS) Y029008 55 1272060 E.I. Monthly No: EI8309071545 E.I. Yearly No: EI83011492 Ba (Zn//1/////3Ta//2/////3)O// CERAMICS WITH LOW DIELECTRIC LOSS AT MICROWAVE FREQUENCIES. Kawashima, Syunichiro; Nishida, Masamitsu; Ued, Ichiro; Ouchi, Hiromu Matsushita Electric Industrial Co, Central Research Lab, Kadoma, Osaka, Jpn Journal of the American Ceramic Society v 66 n 6 Jun 1983 p 421-423 CODEN: JACTAW ISSN: 0002-7820 Lang.: Eng. The dielectric properties at microwave frequencies of Ba (Zn//1/////3Ta//2/////3)O//3 ceramics prepared by sintering were investigated. These ceramics had lower density but higher loss quality than ceramics hot-pressed at 1400 DEGREE C. Loss quality was greatly improved by prolonged sintering. 10 refs. Desc.: *CERAMIC MATERIALS--*Dielectric Properties; MICROWAVE DEVICES--Materials Class. Codes: 812 (Ceramics & Refractories); 701 (Electricity & Magnetism); 708 (Electric & Magnetic Materials); 714 (Electronic Components); 715 (General Electronic Equipment) 81 (CHEMICAL PROCESS INDUSTRIES); 70 (ELECTRICAL ENGINEERING); 71 (ELECTRONICS & COMMUNICATIONS) Y029008 56 1262238 E.I. Monthly No: EI8308061412 E.I. Yearly No: EI83013218 THERMODIFFUSIONAL TREATMENT OF CHROMIUM CARBIDE HARD METALS. Kudryavtsev, V. A.; Pirso, Yu. Yu. Soviet Powder Metallurgy and Metal Ceramics (English translation of Poroshkovaya Metallurgiya) v 21 n 12 Dec 1982 p 964-967 CODEN: SPMCAV ISSN: 0038-5735 Lang.: Eng. The cementing phases of P/M chromium carbide and titanium carbide hard metals can be superficially hardened by thermodiffusional impregnation with phosphorus. Treatment for 3-7 h at 1000 DEGREE C in an alumina filler containing 30-70% nickel phosphide and subsequent 1-h annealing at 400 DEGREE C increase the surface hardness of binder phases by 1. 5-3 GPa. Thermodiffusional treatment doubles the wear resistance of KKhN35 alloy operating under hydroabrasive wear conditions. 17 refs. Desc.: *CHROMIUM COMPOUNDS--*Hardening; TITANIUM CARBIDE--Hardening Class. Codes: 804 (Chemical Products); 536 (Powder Metallurgy) 537 (Heat Treatment) 80 (CHEMICAL ENGINEERING); 53 (METALLURGICAL ENGINEERING) Y029008 57 1262237 E.I. Monthly No: EI8308067687 E.I. Yearly No: EI83075459 MECHANICAL PROPERTIES OF MATERIALS OBTAINED FROM AN ULTRAFINE ALUMINUM NITRIDE POWDER. Zyatkevich, D. P.; Berdikov, V. F.; Makarenko, G. N.; Kosolapova, T. Ya. Soviet Powder Metallurgy and Metal Ceramics (English translation of Poroshkovaya Metallurgiya) v 21 n 12 Dec 1982 p 961-964 CODEN: SPMCAV ISSN: 0038-5735 Lang.: Eng. Aluminum nitride powder was manufactured by plasma-chemical synthesis. Use of a fine powder enables non-porous specimens to be produced having high strength characteristics: SIGMA //c = 1600 MPa, SIGMA //t//r = 320 MPa, microhardness of 16, 800 MPa, microstrength of 3100 MPa, and microbrittleness of 1. 9. Aluminum nitride sintered from an ultrafine powder is a quality constructional ceramic material. 12 refs. Desc.: *POWDER METALLURGY--*Aluminum; CERAMIC MATERIALS Class. Codes: 536 (Powder Metallurgy); 541 (Aluminum & Alloys) 421 (Materials Properties); 812 (Ceramics & Refractories); 53 (METALLURGICAL ENGINEERING); 54 (METAL GROUPS); 42 (MATERIALS PROPERTIES & TESTING); 81 (CHEMICAL PROCESS INDUSTRIES) Y029008 58 1255066 E.I. Monthly No: EI8307055662 E.I. Yearly No: EI83060301 CRYSTAL STRUCTURE OF THE MICROWAVE DIELECTRIC RESONATOR Ba//2Ti//9O//2//0. Tillmanns, Ekkehart; Hofmeister, Wolfgang; Baur, Werner H. Univ Mainz, Enst fuer Geowissenschaften, Mainz, West Ger Journal of the American Ceramic Society v 66 n 4 Apr 1983 p 268-271 CODEN: JACTAW ISSN: 0002-7820 Lang.: Eng. Properties of the dibarium nonatitanate dielectrics were investigated by studying a single crystal, using X-ray apparatus. Since Ba//2Ti//9O//2//0 possesses an excellent combination of low dielectric loss, moderate dielectric constant, and low temperature coefficient of the dielectric constant, it is useful as a microwave resonator. 33 refs. Desc.: *MICROWAVE DEVICES--*Materials; CERAMIC MATERIALS-- Dielectric Properties Class. Codes: 714 (Electronic Components); 812 (Ceramic & Refractories) 71 (ELECTRONICS & COMMUNICATIONS); 81 (CHEMICAL PROCESS INDUSTRIES) Y029008 59 1250334 E.I Monthly No: EI8307055035 E.I. Yearly No: EI83053240 PHOTOLITHOGRAPHIC METHOD OF OBTAINING A METALLIZED PATTERN ON SPECIMENS OF THE MATERIAL OKMAL. Bylina, I. E.; Kositsyna, N. N.; Rotner, Yu. M.; Shaiko, L. P. Instruments and Experimental Techniques (English Translation of Pribory I Tekhnika Eksperimenta) v 25 n 4 pt 2 Jul-Aug 1982 p 1026-1027 CODEN: INETAK ISSN: 0020-4412 Lang.: Eng. A technology is described for obtaining metallized contact areas on specimens of the diamond ceramic OKMAL by a photolithographic method. The technique makes it possible to use the new material OKMAL for the fabrication of heat-conducting substrates for microwave devices. 7 refs. Desc.: *LITHOGRAPHY Class. Codes: 745 (Printing & Reprography) 74 (OPTICAL TECHNOLOGY) Y029008 60 1238285 E.I. Monthly No: EI8306040554 E.I. Yearly No: EI83011440 Ba (Zn//1/////3Nb//2/////3)O//3-?r (Zn//1/////3Nb//2/////3)O//3 SOLID SOLU- TION CERAMICS WITH TEMPERATURE-STABLE HIGH DIELECTRIC CONSTANT AND LOW MICROWAVE LOSS. Onoda, Makoto; Kuwata, Jun; Kaneta, Kumiko; Toyama, Keiichiro; Nomura, Shoichiro Tokyo Inst of Technology, Dep of Physical Electronics, Ookayama, Tokyo, Jpn Jpn J Appl Phys Part 1 v 21 n 12 Pt 1 Dec 1982 p 1707-1710 CODEN: JAPNDE Lang.: Eng. Solid solution ceramics in the Ba (Zn//1/////3Nb//2///?/3)O//3 (BZN)-Sr (Zn//1/////3Nb//2/////3)O//3 (SZN) system have been studied with a view to finding materials for use as dielectric resonators at microwave frequency. The relative dielectric constant and the unloaded Q at 10 G?z are respectively 41 and 5400 for BZN, and 40 and 2000 for SZN. The temperature coefficient of the resonant frequency is estimated as 30 ppm/ DEGREE C for BZN and MINUS 38 ppm/ DEGREE C for SZN. The dielectric constant of 0. 3 BZN-0. 7 SZN ceramic is nearly independent of temperature, which gives a very small estimated temperature coefficient of the resonant frequency of MINUS 5 ppm/ DEGREE C. 13 refs. Desc.: *CERAMIC MATERIALS Class. Codes: 812 (Ceramics & Refractories) 81 (CHEMICAL PROCESS INDUSTRIES) Y029008 61 1237376 E.I. Monthly No: EI8306040559 E.I. Yearly No: EI83011491 LOW DIELECTRIC LOSS CERAMICS FOR USE AT MICROWAVE FREQUENCIES. Kawashima, Syunichiro; Nishida, Masamitsu; Ueda, Ichiro; Ouchi, Hiromu Matsushita Electric Industrial Co, Materials Res Lab, Jpn Natl Tech Rep Matsushita Electr Ind v 28 n 6 Dec 1982 p 1108-1114 CODEN: NTROAV ISSN: 0028-0291 Lang.: ENGLISH The development of new ceramics, which are composed of Ba (Zn//1/////3Ta//2/////?)O//3 X (TIMES) Ba (Zn//1/////3Nb//2/////3) O//3 solid solution, for microwave devices are reported. These ceramics have a large dielectric constant EPSILON //r of 30-40, a loss quality factor Q of 15000, and a temperature coefficient of resonant frequency TAU //f of 0-28 ppm/ DEGREE C (variable by changing the composition). The use of these ceramics as resonant elements of filters and stabilized oscillators, and also as substrate of microwave integrated circuits is examined. 14 refs. In Japanese with English abstract. Desc.: *CERAMIC MATERIALS--*Dielectric Properties; MICROWAVE DEVICES Ident.: LOW DIELECTRIC LOSS Class. Codes: 812 (Ceramics & Refractories); 701 (Electricity & Magnetism); 708 (Electric & Magnetic Materials); 714 (Electronic Components); 715 (General Electronic Equipment) 81 (CHEMICAL PROCESS INDUSTRIES); 70 (ELECTRICAL ENGINEERING); 71 (ELECTRONICS & COMMUNICATIONS) Y029008 62 1229866 E.I. Monthly No: EI8305037454 E.I. Yearly No: EI83079410 MICROSTRUCTURE AND GRAIN-BOUNDARY COMPOSITION OF HOT-PRESSED SILICON NITRIDE WITH YTTRIA AND ALUMINA. Ahn, Channing C.; Thomas, Gareth Univ of Calif, Berkeley, USA Journal of the American Ceramic Society v 66 n 1 Jan 1983 p 14-17 CODEN: JACTAW ISSN: 000?-7820 Lang.: Eng. The microstructure of two hot-pressed silicon nitrides containing Y//2O//3 and Al//2O//3 was examined by electron microscopy, electron diffraction, and quantitative, energy-dispersive x-ray microanalysis. In situ hot-stage experiments in a high-voltage electron microscope show that the amorphous phase volatilizes above 1200 DEGREE C, leaving a skeleton of Si//3N//4 grains linked by the mellilite crystals at triple points. The results show that intergranular glassy phases cannot be eliminated by the Y//2O//3/Al//2O//3 fluxing. 17 refs. Desc.: *REFRACTORY MATERIALS--*Silicon Nitride Class. Codes: 812 (Ceramics & Refractories) 81 (CHEMICAL PROCESS INDUSTRIES) Y029008 63 1229442 E.I. Monthly No: EI8305031893 E.I. Yearly No: EI8300975 ON THE DIELECTRIC POLARIZATION OF BORON NITRIDE AT RADIO AND MICROWAVE FREQUENCIES. Singh, A.; Shukla, P.; Saxena, M. C. Lucknow Univ, India Indian Journal of Pure & Applied Physics v 20 n 7 Jul 1982 p 592-593 CODEN: IJOPAU ISSN: 0019-5596 Lang.: Eng. The dielectric conductivity SIGMA of boron nitride has been calculated in the temperature range 20-500 DEGREE C. The activation energy ( DELTA E) has also been computed by plotting log SIGMA versus 10**3/T at frequencies varying from 10**2 to 10**1**0 Hz. SIGMA has been found to increase with temperature, and DELTA E to decrease with frequency. 2 refs. Desc.: *BORON COMPOUNDS--*Dielectric Properties; MICROWAVES Ident.: BORON NITRIDES Class. Codes: 701 (Electricity & Magnetism); 804 (Chemical Products) 70 (ELECTRICAL ENGINEERING); 80 (CHEMICAL ENGINEERING) Y029008 64 1219135 E.I. Monthly No: EI833016400 E.I. Yearly No: EI83011490 Ba (Mg//1/////3Ta//2/////3)O//3 CERAMICS WITH TEMPERATURE-STABLE HIGH DIELECTRIC CONSTANT AND LOW MICROWAVE LOSS. Nomura, Shoichiro; Toyama, Keiichiro; Kaneta, Kumiko Tokyo Inst of Technol, Jpn Jpn J Appl Phys Part 2 v 21 n 10 Oct 1982 p 624-626 CODEN: JAPLD8 Lang.: Eng. A dense ceramic with an ordered perovskite structure with chemical formula Ba (Mg//1/////3Ta//2/////3)O//3 is prepared, aiming at materials for a dielectric resonator with temperature-stable high dielectric constant and low loss at microwave frequency. A small amount of Mn ion is doped to the sample to complete the sintering. The dielectric constant and unloaded Q are 25 and 16800 at 10. 5 GHz respectively. The temperature coefficient of resonant frequency is estimated as 2. 7 ppm/ DEGREE C in the vicinity of room temperature. The value of Q obtained is the highest among those reported so far on ceramics having a similar characteristic. 14 refs. Desc.: *CERAMIC MATERIALS--*Dielectric Properties Class. Codes: 812 (Ceramics & Refractories); 701 (Electricity & Magnetism) 81 (CHEMICAL PROCESS INDUSTRIES); 70 (ELECTRICAL ENGINEERING) Y029008 65 1197294 E.I. Monthly No: EI8207056888 E.I. Yearly No: EI82012755 SPECIAL CERAMICS 7 (PROCEEDINGS), 1980. Taylor, Derek (Ed. ); Popper, Paul (Ed. ) Br Ceram Soc, Stoke-on-Trent, Engl Proceedings of the British Ceramic Society n 31 Jun 1981, Spec Ceram 7, London, Engl, Dec 15-18 1980. Publ by Br Ceram Soc, Stoke-on-Trent, Engl 265 p CODEN: PBRCAR ISSN: 0524-5141 For individual papers see E.I. Conference No.: 0037 in file 165 Lang.: Eng. This Conference Proceedings contains 23 papers dealing with processing techniques, testing and applications of very dense, strong and heat-resistant ceramics. Most of the papers are devoted to ceramic materials that are used for component parts in gas turbines. They include alumina, silicon nitride and silicon carbide providing information on optimal conditions for firing and densification procedures. Technical and professional papers from this conference are indexed with the conference code no. 00317 in the Ei Engineering Meetings (TM) database produced by Engineering Information, Inc. Desc.: *CERAMIC MATERIALS--*Physical Chemistry; REFRACTORY MATERIALS--Silicon Nitride; CERAMIC PRODUCTS--Manufacture; DENTAL EQUIPMENT AND SUPPLIES--Manufacture Class. Codes: 812 (Ceramics & Refractories); 801 (Chemical Analysis & Physical Chemistry); 804 (Chemical Products); 462 (Medical Engineering & Equipment) 81 (CHEMICAL PROCESS INDUSTRIES); 80 (CHEMICAL ENGINEERING); 46 (BIOENGINEERING) Y029008 66 1175008 E.I. Monthly No: EI8212105286 E.I. Yearly No: EI82015435 EVALUATION OF MATERIALS FOR USE IN LETDOWN VALVES IN COAL LIQUEFACTION SYSTEMS. Mueller, J. L.; Wright, I. G. Battelle, Columbus Lab, Ohio, USA Electr Power Res Inst Adv Power Syst Div Rep EPRI A? n 2356 Apr 1982 var pagings CODEN: ERIAD4 Lang.: Eng. A number of advanced ceramics materials were evaluated in a test facility in which ash-containing coal derived slurry was used as the erodant in a jet impingement- type test designed to evaluate the wear characteristics of letdown valve trim component materials. The advanced ceramic materials evaluated were alumina, aluminatitanium carbide, boron carbide, silicon carbide, tungsten carbide, titanium diboride, hot pressed diamond, CVD codeposited tungsten-carbon and borided steel. Among the materials evaluated, chemically vapor deposited (CVD) silicon carbide was found to offer the greatest erosion resistance and a definite improvement over the cemented carbides in use in pilot plants. Both a compacted diamond product and a CVD form of silicon nitride showed promise. The latter materials would definitely require an improvement in the process of manufacture. Tests of seven different grades or types of alumina showed that all were unacceptable for letdown service. Both the alumina and the CVD silicon carbide displayed a broad range of variation in the erosion behavior, confirming that erosion resistance can differ greatly between grades and form of a given generic ceramic. Desc.: *COAL LIQUEFACTION--*Valves; CERAMIC MATERIALS--Erosion; MATERIALS TESTING--Impact Class. Codes: 523 (Liquid Fuels); 524 (Solid Fuels); 601 (Mechanical Design); 619 (Pipes, Tanks & Accessories); 812 (Ceramics & Refractories); 421 (Materials Properties) 52 (FUEL TECHNOLOGY); 60 (MECHANICAL ENGINEERING); 61 (PLANT & POWER ENGINEERING); 81 (CHEMICAL PROCESS INDUSTRIES); 42 (MATERIALS PROPERTIES & TESTING) Y029008 67 1169669 E.I. Monthly No: EI8212104282 E.I. Yearly No: EI82004950 ROLL COATINGS FORMED DURING THE HOT ROLLING OF ALUMINIUM WITH ROLLS OF DIFFERENT MATERIALS. Howes, V. R.; Amor, M. P. Univ of NSW, Kensington, Aust Wear v 79 n 3 Jul 15 1982 p 375-384 CODEN: WEARAH ISSN: 0043-1648 Lang.: Eng. The lubricated rolling of hot aluminum strip in a small passive mill produced the most roll coating on rolls with a surface layer of plasma-sprayed chromium oxide. A lesser amount of roll coating was produced on rolls of silicon carbide, silicon nitride and tungsten carbide. No roll coatings were detected on various steel rolls after the same amount of rolling. Although rolls of alumina failed during these rolling experiments, rolls with a plasma-sprayed surface layer of alumina remained undamaged but showed evidence of the formation of a roll coating. The comparative study for the different roll materials indicated that it was the mechanical interactions between roll and strip, rather that chemical or thermal interactions, that affected the formation of roll coatings during rolling in the presence of a lubricant - coolant. 5 refs. Desc.: *ALUMINUM SHEET--*Rolling; ROLLS--Failure Class. Codes: 535 (Rolling, Forging & Forming); 541 (Aluminum & Alloys) 53 (METALLURGICAL ENGINEERING); 54 (METAL GROUPS) Y029008 68 1160194 E.I. Monthly No: EI8211102242 E.I. Yearly No: EI82094799 DIFFERENCES BETWEEN MICROWAVE AND RF ACTIVATION OF NITROGEN FOR THE PECVD PROCESS. Bardos, L.; Musil, J.; Taras, P. Czech Acad of Sci, Inst of Plasma Phys, Prague Journal of Physics D: Applied Physics v 15 n 7 Jul 14 1982 p L79-L82 CODEN: JPAPBE ISSN: 0022-3727 Lang.: ENGLISH The activation of nitrogen for the silicon nitride plasma enhanced chemical vapor deposition process outside the plasma region has been studied in both microwave and RF plasmas. A lower production of long-lived metastable nitrogen particles necessary for the reactions with silane molecules has been observed in the RF plasma compared to the microwave plasma. The key role is ascribed to N (**4S) atoms. 8 refs. Desc.: *SILICON COMPOUNDS--*Thin Films; NITROGEN; MICROWAVES Ident.: CHEMICAL VAPOR DEPOSITION; RF ACTIVATION; SILICON NITRIDES Class. Codes: 714 (Electronic Components); 711 (Electromagnetic Waves); 804 (Chemical Products) 71 (ELECTRONICS & COMMUNICATIONS); 80 (CHEMICAL ENGINEERING) Y029008 69 1150698 E.I. Monthly No: EI821002227 E.I. Yearly No: EI82092753 CERAMIC HUMIDITY SENSOR. Nitta, Tsuneharu Matsushita Electr Ind Co, Osaka, Jpn Industrial & Engineering Chemistry, Product Research and Development v 20 n 4 Dec 1981 p 669-674 CODEN: IEPRA ISSN: 0019-7890 Lang.: Eng. A new compact, durable, yet highly sensitive and reliable ceramic humidity sensor has been developed as a cooking control device for automatic microwave ovens. The novel ceramic humidity sensor makes use of a new semiconducting porous ceramic material composed of a solid solution MgCr//2O//4-TiO//2 having humidity sensitive effects and a rejuvenating response to heat treatment and a new heat-cleaning device to burn off organic contaminants such as oil and dust on the surface of the sensor in order to maintain optimum sensitivity. A new automatic microwave oven using the newly developed sensor has been developed and produced. The sensor controls the heating time by detecting humidity. It is expected that the ceramic humidity sensor will be applied extensively in industrial and medical equipment as well as in household appliances such as microwave ovens and air conditioners. 3 refs. Desc.: *SENSORS; HUMIDITY CONTROL--Equipment Class. Codes: 732 (Control Devices); 643 (Space Heating & Air Conditioning) 73 (CONTROL ENGINEERING); 64 (HEAT & THERMODYNAMICS) Y029008 70 1145539 E.I. Monthly No: EI8209075654 E.I. Yearly No: EI82012721 Barium Ferrite for Microwave Devices. BARIUMFERRIT - EIN MATERIAL FUER MILLIMETER-WELLEN. Lemke, M.; Hoppe, W.; Tolksdorf, W.; Welz, U. Philips, Hamburg, Ger Sprechsaal v 114 n 12 Dec 1981 p 895-900 CODEN: SPREAS ISSN: 0584-9632 Lang.: GERMAN The use of ferrite materials for components of microwave devices is described. Magnetically tuneable microwave filters with low losses may be manufactured from barium ferrites with hexagonal structure. Several methods for measurement of barium ferrite elements are described. 10 refs. In German. Desc.: *CERAMIC MATERIALS--*Magnetic Properties; BARIUM COMPOUNDS-- Applications; MICROWAVE DEVICES--Manufacture; MILLIMETER WAVES Class. Codes: 812 (Ceramics & Refractories); 708 (Electric & Magnetic Materials); 804 (Chemical Products); 714 (Electronic Components); 715 (General Electronic Equipment) 81 (CHEMICAL PROCESS INDUSTRIES); 70 (ELECTRICAL ENGINEERING); 80 (CHEMICAL ENGINEERING); 71 (ELECTRONICS & COMMUNICATIONS) Y029008 71 1136726 E.I. Monthly No: EI8208071961 E.I. Yearly No: EI82081657 PROPERTIES OF HOT-PRESSED COMPOSITE TiN-Al//2O//3 MATERIALS PRODUCED FROM FINE ALUMINA AND PLASMA CHEMICAL TITANIUM NITRIDE POWDERS. Vil'k, Yu. N.; Mnatsakanyan, E. D.; Ordan'yan, S. S.; Chekrygina, T. M.; Vdovin, V. N.; Miller, T. N. Soviet Powder Metallurgy and Metal Ceramics (English translation of Poroshkovaya Metallurgiya) v 20 n 7 Jul 1981 p 492-495 CODEN: SPMCAV ISSN: 0038-5735 Lang.: Eng. A study was made of the variation of hydrostatic density, hardness, Poisson's ratio, velocity of propagation of elastic longitudinal vibrations, and moduli of elasticity and shear as functions of TiN concentration in the range 10-1?0 wt. %. 10 refs. Desc.: *POWDER METALLURGY--*Titanium Class. Codes: 536 (Powder Metallurgy); 542 (Light Metals & Alloys); 421 (Materials Properties) 53 (METALLURGICAL ENGINEERING); 54 (METAL GROUPS); 42 (MATERIALS PROPERTIES & TESTING) Y029008 72 1130844 E.I. Monthly No: EI8207056869 E.I. Yearly No: EI2012606 DIELECTRIC LOSSES IN A TIN-ZIRCONIUM TITANATE CERAMICS COMPUTED FROM THE FAR INFRARED SPECTRUM. Gerbaux, X. CNRS, Nancy, Fr International Journal of Infrared and Millimeter Waves v 2 n 6 Nov 1981 p 1263-1269 CODEN: IJIWDO ISSN: 0195-9271 Lang.: Eng. It is shown from observations in both microwaves and far infrared that dielectric losses are smaller than computed form the assumption of far infrared Lorentz oscillators. An explanation is suggested. 4 refs. Desc.: *CERAMIC MATERIALS Class. Codes: 812 (Ceramics & Refractories) 81 (CHEMICAL PROCESS INDUSTRIES) Y029008 73 1124464 E.I. Monthly No: EI8206047566 E.I. Yearly No: EI82012799 MICROWAVE SINTERING OF FERRITES. Krage, Mark K. GM, Warren, Mich, USA American Ceramic Society Bulletin v 60 n 11 Nov 1981 p 1232-1234 CODEN: ACSBA7 ISSN: 0002-7812 Lang.: Eng. The present work discusses the application of microwave heating for sintering of barium ferrite magnets. The origins of the electromagnetic losses, which are responsible for heating in a microwave field, are reviewed. The results show that such magnets can be sintered very rapidly by microwave heating in small-size kilns. 9 refs. Desc.: *CERAMIC MATERIALS--*Sintering; FERRITES--Manufacture Class. Codes: 812 (Ceramics & Refractories); 708 (Electric & Magnetic Materials) 81 (CHEMICAL PROCESS INDUSTRIES); 70 (ELECTRICAL ENGINEERING) Y029008 74 1123756 E.I. Monthly No: EI8206046893 E.I. Yearly No: EI82003970 KINETICS OF THE F/ALUMINA GASIFICATION REACTION. Nordine, Paul C.; Duran, Alex; Kurtz, Sarah Yale Univ, New Haven, Conn, USA High Temperature Science v 14 n 2 Jun 1981 p 109-120 CODEN: HITSAC ISSN: 0018-1536 Lang.: Eng. Intrinsic kinetics for the F/alumina gasification reaction were measured using a low pressure, transonic microwave discharge flow reactor technique, at p//F = 2. 4 Pa and 1100 LESS THAN EQUIVALENT TO T LESS THAN EQUIVALENT TO 2000 K. Rate measurements were obtained on polycrystalline alumina tubes or single crystal sapphire rods that were heated with a cw CO//2 laser and on alumina tubes heated internally by a tungsten filament electrical heating element. Impurities greatly influence the rate of reaction, which is negligible below 1500 K for uniformly heated specimens containing less than 1% Ca. 25 refs. Desc.: *ALUMINA; CHEMICAL REACTIONS--Reaction Kinetics; HIGH TEMPERATURE ENGINEERING Ident.: GASIFICATION REACTION Class. Codes: 812 (Ceramics & Refractories); 802 (Chemical Apparatus & Plants); 422 (Materials Testing) 81 (CHEMICAL PROCESS INDUSTRIES); 80 (CHEMICAL ENGINEERING); 42 (MATERIALS PROPERTIES & TESTING) Y029008 75 1110065 E.I. Monthly No: EI8204033218 E.I. Yearly No: EI82081373 FORMS OF ULTRAFINE POWDER PARTICLE GROWTH IN PLASMA-CHEMICAL REACTIONS. Aivazov, M. I.; Volod'ko, V. V.; Evseev, B. A.; Nikulin, Yu. N. Soviet Powder Metallurgy and Metal Ceramics (English translation of Poroshkovaya Metallurgiya) v 20 n 1 Jan 1981 p 1-3 CODEN: SPMCAV ISSN: 0038-5735 Lang.: Eng. A study was made of the crystal structures and particle shapes of plasma-chemical powders of alumina, tin dioxide, and titanium nitride, carbide, and diboride powders. 5 refs. Desc.: *POWDER METALLURGY Class. Codes: 536 (Powder Metallurgy); 812 (Ceramics & Refractories); 546 (Lead, Tin, Zinc, Antimony & Alloys); 542 (Light Metals & Alloys) 53 (METALLURGICAL ENGINEERING); 81 (CHEMICAL PROCESS INDUSTRIES); 54 (METAL GROUPS) Y029008 76 1101445 E.I. Monthly No: EI8203024863 E.I. Yearly No: EI82094769 EFFECT OF ADDITIVES ON SINTERING OF SILICON NITRIDE-ALUMINA-ALUMINUM NITRIDE COMPOSITIONS. Jong, B. W.; Heystek, H. Bur of Mines, Tuscaloosa, Ala, USA US Bur Mines Rep Invest n 8546 1981 17 p CODEN: BMIA6 ISSN: 0096-1922 Lang.: Eng. Sintering and MOR (modulus of rupture) data were developed for s?alon compositions produced from Si//3N//4, Al//2O//3, and AlN. When doped with Y//2O//3 to aid in sintering, the highest MOR values were obtained with compositions containing between 20 and 30 mole-pct (Al//2O//3 PLUS AlN). The effect of the crystalline phase of Si//N//4 and Al//2O//3 on MOR was also investigated. 27 refs. Desc.: *SILICON COMPOUNDS--*Additives Ident.: SIALOM Class. Codes: 804 (Chemical Products) 80 (CHEMICAL ENGINEERING) Y029008 77 1091166 E.I. Monthly No: EI8202012377 E.I. Yearly No: EI82046381 ANALYSIS OF POTENTIAL ATTACK ON INSULATING MATERIALS EXPOSED TO SODIUM. Allam, I. M.; Lamoreaux, R. H.; Loehman, R. E. SRI Int, Menlo Park, Calif, USA Electr Power Res Inst Rep EPRI NP n 1986 Aug 1981 var pagings CODEN: ERNPD6 Lang.: Eng. A series of thermodynamic calculations of ceramic stabilities as a function of oxygen concentration in the liquid sodium was used to select materials for experimental testing. Several commercial ceramics were exposed to liquid sodium for 10 weeks at 741 K, in a test program aimed at evaluating their suitability as LMFBR insulators. All ceramics exhibiting connected porosity were completely impregnated by the liquid sodium. Dense alumina, however, showed no sign of either physical or chemical attack as a result of the 10-week test. Commercial magnesia-based ceramics exhibited variable degrees of sodium attack depending on the concentration of oxide impurities at grain boundaries. Individual magnesium oxide grains showed no evidence of reaction with sodium. Zirconia, graphite and silicon nitride were somewhat degraded by their 10-week exposure to sodium. 22 refs. Desc.: *HEAT INSULATING MATERIALS--*Testing; NUCLEAR REACTORS, BREEDER; SODIUM AND ALLOYS; CERAMIC MATERIALS Class. Codes: 413 (Insulating Materials); 621 (Nuclear Reactors); 812 (Ceramics & Refractories) 41 (CONSTRUCTION MATERIALS); 62 (NUCLEAR TECHNOLOGY); 81 (CHEMICAL PROCESS INDUSTRIES) Y029008 78 1089508 E.I. Monthly No: EI8201003911 E.I. Yearly No: EI82051533 STATE-OF-THE-ART OF MULTI-LAYERED, CO-FIRED BERYLLIA COMPONENTS FOR MICROWAVE PACKAGES. Kiger, T.; Holliday, C. Brush Wellman Inc, Elmore, Ohio, USA Proc Electron Components Conf 29th, Cherry Hill, NJ, USA, May 14-16 1979. Publ by IEEE (Cat n 79CH1457-1 CHMT), Piscataway, NJ, USA p 135-140 CODEN: PECCA7 ISSN: 0569-5503 Lang.: ENG. A process based on using green ceramic tape for manufacturing multi layered, co-fired beryllia components has been described. The major processing operations: tape punching, screen printing, laminating, cutting and sintering were discussed. Graphic illustrations of in-process through finished products were presented as related to the various process steps. Component design guidelines directed toward more cost effective manufacturing were presented. 2 refs. Desc.: *INTEGRATED CIRCUIT MANUFACTURE--*Microwaves; CERAMIC MATERIALS; BERYLLIUM COMPOUNDS Class. Codes: 713 (Electronic Circuits); 714 (Electronic Components); 711 (Electromagnetic Waves); 812 (Ceramics & Refractories); 804 (Chemical Products) 71 (ELECTRONICS & COMMUNICATIONS); 81 (CHEMICAL PROCESS INDUSTRIES); 80 (CHEMICAL ENGINEERING) Y029008 79 1081393 E.I. Monthly No: EI811210408 E.I. Yearly No: EI81080134 APPLICATION OF DIELECTRIC RESONATORS IN MICROWAVE COMPONENTS. Plourde, James; Ren, Chung Li Bell Lab, Allentown, Pa IEEE Transactions on Microwave Theory and Techniques v MTT-29 n 8 Aug 1981 p 754-770 CODEN: IETMAB ISSN: 0018-9480 Lang.: Eng. Dielectric resonators are being use in microwave filters and oscillators now that high-dielectric-constant, High-Q, temperature-stable ceramics have been developed. This paper reviews dielectric resonators with emphasis on applications, contains tutorial material, describes new 2-, 4-, and 6-GHz bandpass filters, and presents several examples of oscillator applications. A complete bibliography to English Lang. publications on dielectric resonators is included. 112 refs. Desc.: *RESONATORS--*Microwaves; DIELECTRIC DEVICES--Applications; MICROWAVE DEVICES; ELECTRIC FILTERS, MICROWAVE; OSCILLATORS MICROWAVE-- Applications; ELECTRIC FILTERS, BANDPASS Ident.: DIELECTRIC RESONATORS Class. Codes: 714 (Electronic Components); 711 (Electromagnetic Waves); 713 (Electronic Circuits); 715 (General Electronic Equipment) 71 (ELECTRONICS & COMMUNICATIONS) Y029008 80 1039863 E.I. Monthly No: EI8108062989 E.I. Yearly No: EI8100471 CLAD LAMINATES OF PTFE COMPOSITES FOR MICROWAVE ANTENNAS. Traut, G. R. Rogers Corp, Conn Microwave Journal v 23 n 11 Nov 1980 p 47-51 CODEN: MCWJAD ISSN: 0026-2897 Lang.: Eng. Copper-clad or specially backed laminates based on composites of PTFE fluorocarbon polymer with non-woven glass fiber or with high dielectric constant ceramic fillers offer combinations of properties valuable for microwave antennas. Uniformity of dielectric constant, isotropy, thermal coefficients, stability, low loss tangent, and thickness uniformity are important to the designer. Those building antennas are concerned with such characteristics as chemical resistance, low moisture absorption, strain relief, formability, machineability, and bondability. Conversion techniques to optimize component performance are discussed. It is important to have convenient test methods for dielectric constant that allow close control of the base material by the producer or close monitoring of dielectric constant so that antenna pattern artwork can be adjusted. A rigid nondestructive test method is summarized. 2 refs. Desc.: *ANTENNAS Class. Codes: 716 (Radar, Radio & TV Electronic Equipment) 71 (ELECTRONICS & COMMUNICATIONS) Y029008 81 1031696 E.I. Monthly No: EI8107056803 E.I. Yearly No: EI81036151 STUDY OF NARROW LINEWIDTH Li-FERRITE. Sun, Mingche; Shu, Yuchen Southwest Res Inst of Appl Magn, Sichuan, China IEEE Transactions on Magnetics v MAG-16 n 5 Sep 1980 Int Magn Conf (INTERMAG '80), Boston, Mass, Apr 21-24 1980 p 672-674 CODEN: IEMGAQ ISSN: 0018-9464 Lang.: Eng. Using conventional ceramic procedure and cheap raw materials, the authors prepared narrow linewidth polycrystalline Li-ferrites with the chemical formula: Li//0//. //5// (//1// MINUS //x// PLUS //y)Zn//xTi//yFe//2//. //5// MINUS //0//. //5// (//x// PLUS //3//y//)// MINUS //zMn//zO//4 in the region of 00. 15 < x LESS THAN EQUIVALENT TO 0.?30, 0. 85 < y < 1. 10, 0. 03 LESS THAN EQUIVALENT TO z LESS THAN EQUIVALENT TO 0. 05 and observed the growth condidion of the grains. The performances obtained are given. The effect of the preparation technology and the composition is discussed. The results show that the growth procedure of the grains is closely related to the distribution of the particle sizes of the powder. The experimental results show that this ferrite is suitable for applications in microwave devices, such as low power circulators. 4 refs. Desc.: *FERRITES--*Magnetic Properties; LITHIUM AND ALLOYS-- Magnetic Properties Class. Codes: 708 (Electric & Magnetic Materials); 542 (Light Metals & Alloys); 549 (Nonferrous Metals & Alloys) 70 (ELECTRICAL ENGINEERING); 54 (METAL GROUPS) Y029008 82 1016245 E.I. Monthly No: EI8105043826 E.I. Yearly No: EI81079375 EFFECT OF ADDITIVES ON SINTERING OF SILICON NITRIDE-ALUMINA COMPOSITIONS. Jong, B. W. Bur of Mines, Boulder City, Nev US Bur Mines Rep Invest n 8466 1980 16 p CODEN: XBMIA6 ISSN: 0096-1922 Lang.: Eng. The Tuscaloosa Research Center evaluated the effect of additives on sintering and strength properties of silicon aluminum oxynitride compositions fabricated by a powder metallurgy technique. Additions of Y//2O//3, Gd//2O//3, CeO//2, MgO, ZrO//2, ZrSiO//4, and MgAl//2O//? to a sialon composition containing 70 pct BETA -Si//3N//4 PLUS 30 pct ALPHA -Al//2O//3 increased sintered densities by as much as 50 pct undoped material. Sintered densities reached a maximum between 20 and 30 mole-pct ALPHA -Al//2O//3 when compositions of ALPHA -Si//3N//4, having 6. 7 to 57. 9 pct ALPHA -Al//2O//3 were doped with Y//2?//3, Gd//2O//3, and MgO. In studies to establish the effect of the crystalline phase of the silicon nitride and alumina used, tests were made using ALPHA -and BETA -Si//3N//4 and ALPHA - and GAMMA -Al//2O//3 as starting materials. 27 Desc.: *REFRACTORY MATERIALS--*Sintering; POWDER METALLURGY-- Silicon Compounds Class. Codes: 812 (Ceramics & Refractories); 536 (Powder Metallurgy) 81 (CHEMICAL PROCESS INDUSTRIES); 53 (METALLURGICAL ENGINEERING) Y029008 83 1015991 E.I. Monthly No: EI8105040906 E.I. Yearly No: EI81043031 FOAMING OF BOROSILICATE GLASSES BY CHEMICAL REACTIONS IN THE TEMPERATURE RANGE 950 -- 1150 DEGREE C. Bayer, Gerhard Eidg Tech Hochsch, Zurich, Switz Journal of Non-Crystalline Solids v 38 & 39 Pt 2 May-Jun 1980, Proc of the Int Congr on Glass, 12th, Albuquerque, NM, Jul 6-11 1980 p 855-860 CODEN: JNCSBJ ISSN: 0022-3093 Lang.: Eng. Sinering experiments with glass powders showed that silicon carbide and silicon nitride are very effective foaming agents for borosilicate glasses over a wide range of temperatures. They allow control of the pore size and pore structure of the foamed products by variation of their concentration and by admixture of transition metal oxides. The pronounced crystallization tendency of the glass powders to cristobalite can be inhibited by addition of alumina-containing materials. The reactions of SiC and of Si//3N//4 with the atmosphere, with constituents of the glass and with the mineral components are rather complex. Depending on the foaming agents used, the gas present in the closed pores is composed of CO, CO//2, N//2, and H//2. 8 refs. Desc.: *GLASS MANUFACTURE Class. Codes: 812 (Ceramics & Refractories) 81 (CHEMICAL PROCESS INDUSTRIES) Y029008 84 1010858 E.I. Monthly No: EI8104031788 E.I. Yearly No: EI81024585 DUAL DIELECTRIC NONVOLATILE MEMORY CELLS WITH THERMALLY GROWN SILICON NITRIDE FILMS. Hijiya, Shinpei; Ito, Takashi; Shinoda, Masaichi Fujitsu Lab Ltd, Jpn Fujitsu Scientific and Technical Journal v 16 n 3 Sep 1980 p 115-121 CODEN: FUSTA4 ISSN: 0016-2523 Lang.: Eng. The use of the dual dielectric structure as an electrically erasable programmable read-only memory, or EE-PROM, has attracted a great deal of attention in recent years. This paper describes a new dual dielectric structure EE-PROM cell. An electrically reprogrammable memory cell has been experimentally realized by employing a thermally grown silicon nitride film as the inner dielectric layer and a pyrolytic alumina film as the outer dielectric layer. The fabrication process and basic operational features are described. Good retention in charge storage, high switching speed in writing/erasing and normally off type operation have been realized. Desc.: *DATA STORAGE, SEMICONDUCTOR Class. Codes: 714 (Electronic Components); 721 (Computer Circuits & Logic Elements) 71 (ELECTRONICS & COMMUNICATIONS); 72 (COMPUTERS & DATA PROCESSING) Y029008 85 0967579 E.I. Monthly No: EI8011083199 E.I. Yearly No: EI80042489 CERAMIC HUMIDITY SENSORS. Nitta, Tsuneharu; Hayakawa, Shigeru Matsushita Electr Ind Co, Osaka, Jpn IEE Transactions on Components, Hybrids and Manufacturing Technology v CHMT-3 n 2 Jun 1980 p 237-243 CODEN: ITTEDR ISSN: 0148-6411 Lang.: Eng. A novel humidity sensor using a MgCr//2O//4-TiO//2 porous ceramic has been developed for an automatic microwave oven. Physical properties of the MgCr//2O//4-TiO//2 ceramic, construction and humidity characteristics of the sensors, and outlines of the control of the automatic microwave oven by humidity sensing are described. 30 refs. Desc.: *HUMIDITY CONTROL; SENSORS; CERAMIC MATERIALS Class. Codes: 643 (Space Heating & Air Conditioning); 732 (Control Devices); 812 (Ceramics & Refractories) 64 (HEAT & THERMODYNAMICS); 73 (CONTROL ENGINEERING); 81 (CHEMICAL PROCESS INDUSTRIES) Y029008 86 0964093 E.I. Monthly No: EI8011080771 E.I. Yearly No: EI80010956 PROCEEDINGS OF INTERNATIONAL SYMPOSIUM ON FACTORS IN DENSIFICATION AND SINTERING OF OXIDE AND NON-OXIDE CERAMICS, 1978. Somiya, Shigeyuki (Ed. ); Saito, Shinroku, (Ed. ) Tokyo Inst of Technol, Res Lab of Eng Mater, Yokohama, Jpn Proc of Int Symp on Factors in Densification and Sintering of Oxide and Non-oxide Ceram, Hakone, Jpn, Oct 3-5 1978 Publ by Gakujutsu Bunken Fukyu-Kai, Tokyo, Jpn, 1979 702 Lang.: Eng. This conference proceedings contains 51 papers, all of which are indexed separately. Most of the papers deal with ceramic materials being considered for high temperature engineering applications, notably silicon nitride or other silicon compounds. Boron nitride, zirconia, alumina, and the oxides of nickel, chromium, zinc and iron have also been studied to understand various sintering and densification methods and the effects of high pressure, stress, densification aids, impurities, grain growth, atmospheres surface roughness and devitrification on material properties. Desc.: *CERAMIC MATERIALS--*Sintering; HIGH TEMPERATURE ENGINEERING Class. Codes: 812 (Ceramics & Refractories); 421 (Materials Properties) 81 (CHEMICAL PROCESS INDUSTRIES); 42 (MATERIALS PROPERTIES & TESTING) Y029008 87 0962458 E.I. Monthly No: EI8011080758 E.I. Yearly No: EI80010906 PHASE EFFECTS IN Si//3N//4 CONTAINING Y//2O//3 OR CeO//2 -- 1. STRENGTH. Smith, J. Thomas; Quackenbush, Carr Lane GTE, Waltham, Mass American Ceramic Society Bulletin v 59 n 5 May 1980 p 529-532, 537 CODEN: ACSBA7 ISSN: 0002-7812 Lang.: Eng. The effects of addition of alumina on densification of silicon nitride based ceramics were investigated. The addition of Al//2O//3 to Si//3N//4 powder compositions containing rare earth oxide densification additives facilitates both sintering and hot pressing. However, it also causes a reduction in the high temperature strength of the consolidated material. 16 refs. Desc.: *CERAMIC MATERIALS--*Manufacture; SILICON COMPOUNDS-- Applications Ident.: SILICON NITRIDE Class. Codes: 812 (Ceramics & Refractories); 804 (Chemical Products) 81 (CHEMICAL PROCESS INDUSTRIES); 80 (CHEMICAL ENGINEERING) Y029008 88 0957783 E.I. Monthly No: EI801072715 E.I. Yearly No: EI80006418 HYSTERESIS OF THE MICROWAVE ABSORPTION AND MAGNETIZATION REVERSAL OF BaFe//1//2O//1//9 POWDER. Roos, W.; Hempel, K. A. RWTH, Aachen, Ger Journal of Magnetism and Magnetic Materials v 15-18 Pt 3 Jan-Mar 1980, Proc of the Int Conf on Magn, (ICM '79), Munich, Ger, Sep 3-7 1979 p 1457-1458 CODEN: JMMMDC ISSN: 0304-8853 Lang.: Eng. The hysteresis of the microwave absorption of polycrystalline barium ferrite has been investigated at frequencies below the natural ferromagnetic resonance frequency. The observed discrepancy between experimental and calculated absorption curves can be explained by considering the magnetization reversal mechanism of real crystals which is determined by nucleation. 5 refs. Desc.: *BARIUM COMPOUNDS--*Magnetic Properties; MICROWAVES-- Absorption; MAGNETIZATION; MAGNETIC MATERIALS--Ferromagnetism; MAGNETIC RESONANCE; FERRITES Ident.: BARIUM FERRITES Class. Codes: 708 (Electric & Magnetic Materials); 701 (Electricity & Magnetism); 711 (Electromagnetic Waves); 804 (Chemical Products); 931 (Applied Physics) 70 (ELECTRICAL ENGINEERING); 71 (ELECTRONICS & COMMUNICATIONS); 80 (CHEMICAL ENGINEERING); 93 (ENGINEERING PHYSICS) Y029008 89 0957777 E.I. Monthly No: EI8010076292 E.I. Yearly No: EI8004889 RUTHENIUM DOPED LITHIUM FERRITE. Mills-Goodlet, R. P.; Nixon, D. E.; Pointon, A. J. Portsmouth Polytec, Engl Journal of Magnetism and Magnetic Materials v 15-18 Pt 3 Jan-Mar 1980, Proc of the Int Conf on Magn, (ICM '79), Munich, Ger, Sep 3-7 1979 p 1443-1444 CODEN: JMMMDC ISSN: 0304-8853 Lang.: Eng. A study is reported of the structural and magnetic changes which accompany the substitution of ruthenium into lithium ferrite, an important microwave material. The maximum solubility of ruthenium in lithium ferrite, x//l//i//m, in the temperature range 1000 to 1300 DEGREE C is related to the firing temperature. 7 refs. Desc.: *LITHIUM COMPOUNDS--*Magnetic Properties; RUTHENIUM AND ALLOYS; FERRITES; MICROWAVE DEVICES Ident.: LITHIUM FERRITES Class. Codes: 708 (Electric & Magnetic Materials); 701 (Electricity & Magnetism); 547 (Precious & Rare Earth Metals & Alloys); 715 (General Electronic Equipment); 804 (Chemical Products) 70 (ELECTRICAL ENGINEERING); 54 (METAL GROUPS); 71 (ELECTRONICS & COMMUNICATIONS); 80 (CHEMICAL ENGINEERING) Y029008 90 095673 E.I. Monthly No: EI8010072498 E.I. Yearly No: EI80003434 PLASMA SINTERING OF BETA '' -ALUMINA. Johnson, D. Lynn; Rizzo, Ronald A. Northwest Univ, Evanston, Ill American Ceramic Society Bulletin v 59 n 4 Apr 1980 p467-468, 472 CODEN: ACSBA7 ISSN: 0002-7812 Lang.: Eng. An induction-coupled plasma was used to sinter tubes of lithia-stabilized BETA '' -alumina in static and flowing argon atmospheres. Although sintering conditions were not optimized, improved results were observed with static atmospheres. The buildup of a sodium oxide partial pressure is believed to be responsible for this finding. 5 refs. Desc.: *ALUMINA--*Sintered Class. Codes: 812 (Ceramics & Refractories) 81 (CHEMICAL PROCESS INDUSTRIES) Y029008 91 0954047 E.I. Monthly No: EI8010073072 E.I. Yearly No: EI80010875 NEWLY DEVELOPED TERNARY (Ca, Sr, Ba)ZIRCONATE CERAMIC SYSTEM FOR MICROWAVE RESONATORS. Yamaguchi, T.; Komatsu, Y.; Otobe, T.; Murakami, Y. Sony Corp, Yokohama, Jpn Ferroelectrics v 27 n 1/4 1980, IEEE Int Symp on Appl of Ferroelectr, Part 1, Minneapolis, Minn, Jun 13-15 1979 p 273-276 CODEN: FEROA8 ISSN: 0015-0193 Lang.: Eng. In Ca, Sr-rich region with orthrhombic perovskite-type structure, successful results such as high dielectric Q (2000-3000 at 11 GHz), suitable dielectric constant, (29-32) and widely adjustable temperature coefficient of dielectric constant ( MINUS 50 to PLUS 50 ppm/ DEGREE C) were obtained. It is also found that substitution of small amounts of Ti for Zr brings some decrease in temperature coefficient with increase in dielectric Q. Using these ceramics in microwave integrated circuit oscillators with GaAs ?FET, a compensation for temperature dependence of circuit elements was achieved within the value which corresponds to the deviation of oscillation frequency within PLUS OR MINUS 500 KHz at 11. 66 GHz ( MINUS 20- PLUS 60 DEGREE C). 4 refs. Desc.: *CERAMIC MATERIALS--*Ferroelectric; RESONATORS Class. Codes: 812 (Ceramics & Refractories); 708 (Electric & Magnetic Materials); 714 (Electronic Components) 81 (CHEMICAL PROCESS INDUSTRIES); 70 (ELECTRICAL ENGINEERING); 71 (ELECTRONICS & COMMUNICATIONS) Y029008 92 0942254 E.I. Monthly No: EI800857391 E.I. Yearly No: EI80003872 HYDROGEN PERMEATION THROUGH NON-METALLIC SOLIDS. Verghese, K.; Zumwalt, L. R.; Feg, C. P.; Elleman, T. S. NC State Univ, Raleigh Journal of Nuclear Materials v 85 & 86 Part B Dec 1979, Fusion React Mater, Proc of 1st Top Meet, Miami Beach, Fla, Jan 29-31 1979 p 1161-1164 CODEN: JNUMAM ISSN: 0022-?115 Lang.: Eng. Hydrogen permeation rates through high-density sintered aluminum oxide and KT-silicon carbide tubes have been measured. The temperature and pressure ranges were 1200 DEGREE C-1450 DEGREE C and 2-50 kPa respectively. Both have about two to three orders of magnitude lower hydrogen permeability than the least permeable of the refractory metals. 4 refs. Desc.: *ALUMINUM COMPOUNDS--*Chemical Reactions; NUCLEAR REACTORS, THERMONUCLEAR; SILICON CARBIDE; PROTECTIVE COATINGS Ident.: PERMEATION; PLASMA/WALL INTERACTIONS; HYDROGEN PERMEABILITY FIRST WALL Class. Codes: 804 (Chemical Products); 621 (Nuclear Reactors); 812 (Ceramics & Refractories); 539 (Metals Corrosion & Protection); 801 (Chemical Analysis & Physical Chemistry) 80 (CHEMICAL ENGINEERING); 62 (NUCLEAR TECHNOLOGY); 81 (CHEMICAL PROCESS INDUSTRIES); 53 (METALLURGICAL ENGINEERING) Y029008 93 0932875 E.I. Monthly No: EI8007055232 E.I. Yearly No: EI80076240 METHOD FOR THE DETERMINATION OF THE STRESS IN, AND YOUNG'S MODULUS OF SILICON NITRIDE PASSIVATION LAYERS. van Nie, Aart G. Philips Res Lab, Endhoven, Neth Solid State Technology v 23 n 1 Jan 1980 p 81-84 CODEN: SSTEAP ISSN: 0038-111X Lang.: Eng. A method for determing stresses in and Young's modulus of layers deposited upon a substrate is described. The measuring samples are strips and the stresses are calculated on the basis of the radius of curvature of the strip due to the stresses. Young's modulus is computed from the radii of curvature caused by known central loads. The curvature is measured with the aid of a laser interferometer system. The radii of curvature are determined by means of a least-squares curve-fitting method. Young's modulus of silicon nitride layers deposited upon Si substrates using plasma deposition form SiH//4 and NH//3 turns out to be 1-2 X 10**1**1N/m**2, which is of the same order of magnitude as that for reaction sintered Si//3N//4. 9 refs. Desc.: *SEMICONDUCTOR DEVICE MANUFACTURE Class. Codes: 714 (Electronic Components) 71 (ELECTRONICS & COMMUNICATIONS) Y029008 94 0914497 E.I. Monthly No: EI800429123 E.I. Yearly No: EI80030510 MICRO WAVE TUBE APPLICATIONS OF RARE EARTH COBALT PERMANENT MAGNETS (HICOREX). Harada, H.; Okayasu, S.; Kakinuma, N. Hitachi Met Ltd, Saitama, Jpn Proc of the Int Workshop of Rare Earth-Cobalt Perm Magnets and their Appl, 4th, Hakone Natl Park, Jpn, May 22-24 1979 Sponsored by Soc of Non-Tradit Technol, Tokyo, Jpn, 1979 p 71-81 Lang.: Eng. A rare earth-cobalt permanent magnet (Hicorex) with improved magnetic properties has been investigated for possible use in microwave tubes. The magnets are useful in TWT applications where extremely small size and/or light weight magnets are required. In magnetron applications, and especially magnetrons intended for microwave ovens, by installing rare earth-cobalt magnets inside the vacuum tube in a nest type configuration it is possible to manufacture products having 50% the weight and 70% the volume of magnetrons with ceramic magnets. Desc.: *ELECTRON TUBES, MICROWAVE--*Design; MAGNETS--Applications; RARE EARTH COMPOUNDS--Applications; ELECTRON TUBES, TRAVELING WAVE; ELECTRON TUBES, MAGNETRON Ident.: RARE EARTH MAGNETS Class. Codes: 714 (Electronic Components); 704 (Electric Components & Equipment); 547 (Precious & Rare Earth Metals & Alloys) 71 (ELECTRONICS & COMMUNICATIONS); 70 (ELECTRICAL ENGINEERING); 54 (METAL GROUPS) Y029008 95 0912724 E.I. Monthly No: EI8004032275 E.I. Yearly No: EI80071871 SIALON REFRACTORIES FROM CLAY AND COAL. Anon Univ of Utah, Salt Lake City Annu Conf Mater Coal Convers Util Proc 4th, Gaithersburg, Md, Oct 9-11 1979. Publ by DOE (CONF-791014), Washington, DC, 1979. Available from NTIS, Springfield, Va p IV. 42-IV. 43 CODEN: ACMPDM ISSN: 0270-1928 Lang.: Eng. Sialon, a solid solution of silicon nitride and aluminum oxynitride, can be obtained from clay and coal by reaction with nitrogen. Sialon is similar to silicon nitride in many properties but unlike silicon nitride, sialon can be sintered to near theoretical density much like alumina. A practical scheme for producing kilogram quantities of sialon in the form of a sinterable powder has been devised and tested in a laboratory. The high temperature properties of sialon are sensitive to impurities. Some impurities are detrimental to the hot strength of sialon and some impurities aid in the sintering of sialon. These initial results will be explored further and optimization of high temperature properties will be the objective of continued research. Desc.: *REFRACTORY MATERIALS--*Manufacture; CLAY PRODUCTS; COAL ASH Class. Codes: 812 (Ceramics & Refractories); 524 (Solid Fuels) 81 (CHEMICAL PROCESS INDUSTRIES); 52 (FUEL TECHNOLOGY) Y029008 96 0884003 E.I. Monthly No: EI8001005843 E.I. Yearly No: EI80062718 GAS-LIQUID CHROMATOGRAPHIC DETERMINATION OF MIREX IN PLASMA, LIVER AND FAT FROM MICE AND MONKEYS. Stein, Vincent B; Pittman, Kenneth A. Albany Med Coll, NY Bulletin of Environmental Contamination and Toxicology v 23 n 3 Oct 1979 p 300-305 CODEN: BECTA6 ISSN: 0007-4861 Lang.: Eng. Mirex is used in the southeastern United States for control of the imported fire ant. Although numerous papers have been written describing the determination of Mirex in biological samples, most of these methods are tedious, time consuming and require large volumes of solvent and bulky glassware. Minimum detectable levels and recovery data for the particular analysis were overlooked in most of these studies. The purpose of this study was to develop a rapid and sensitive method using small quantities of sample for the analysis of Mirex in tissues and plasma. 11 refs. Desc.: *PESTICIDES--*Chromatographic Analysis Class. Codes: 804 (Chemical Products); 801 (Chemical Analysis & Physical Chemistry) 80 (CHEMICAL ENGINEERING) Y029008 97 0866642 E.I. Monthly No: EI7912092364 E.I. Yearly No: EI79003112 GLASS-CERAMICS IN RADOME APPLICATIONS. Partridge, G.; Ward, F. R. Staffs Lab, Engl GEC Journal of Science and Technology v 45 n 2 1979 p 71-77 CODEN: GJSTA6 ISSN: 0302-2587 Lang.: Eng. For high-speed applications in aircraft and guided missiles, inorganic refractory materials are necessary as radomes. Work carried out on glass-ceramics for radome applications is reported. Lithium alumino-silicate and zinc alumino-silicate glass-ceramics have been investigated. Their propertiess are described and compared with other inorganic radome materials. It is shown that these glass-ceramics have considerable potential. The zinc alumino-silicate type, by virtue of its excellent dielectric properties and potentially good resistance to thermal shock, seems particularly suitable for high-speed microwave radome applications. 4 refs. Desc.: *AIRCRAFT--*Radomes; ROCKETS AND MISSILES--Radio Equipment; GLASS--Applications; CERAMIC MATERIALS--Applications Ident.: GLASS-CERAMICS Class. Codes: 652 (Aircraft); 716 (Radar, Radio & TV Electronic Equipment); 654 (Rockets & Rocket Propulsion); 81 (Ceramics & Refractories) 65 (AEROSPACE ENGINEERING); 71 (ELECTRONICS & COMMUNICATIONS); 81 (CHEMICAL PROCESS INDUSTRIES) Y029008 98 0865602 E.I. Monthly No: EI7912093044 E.I. Yearly No: EI79011817 Fracture Touchness of Alumina and Silicon Nitride Using the Knoop Indentation Method. BRUCHWIDERSTANDSMESSUNGEN AN A?//2O//3 UND Si//3N//4 MIT DER KNOOP-HAERTEEINDRUCK-TECHNIK. Ziegler, Guenter; Munz, Dietrich DFVLR, Keln, Ger Berichte der Deutschen Keramischen Gesellschaft v 56 n 6 Jun 1979 p 128-131 CODEN: BDKGAY ISSN: 0365-9542 Lang.: GERMAN The fracture toughness of high-strength alumina, hot-pressed silicon nitride and two reaction-sintered varieties of silicon nitride of different pore structures was determined by controlled cracking by means of Knoop indentations. Special attention was paid to the effect of the load under which the indentations were made. 22 refs. In German with English abstract. Desc.: *CERAMIC MATERIALS--*Fracture Class. Codes: 812 (Ceramics & Refractories) 81 (CHEMICAL PROCESS INDUSTRIES) Y029008 99 0854915 E.I. Monthly No: EI790081864 E.I. Yearly No: EI79075059 REFRACTORY MATERIALS OF HIGH THERMAL FATIGUE RESISTANCE FOR ARC WELDING GUIDE BUSHINGS. Kazakov, V. K.; Kislyi, P. S.; Milova, L. K. Acad of Sci of the Ukr SSR, Inst of Mater Sci Soviet Powder Metallurgy and Metal Ceramics (English translation of Poroshkovaya Metallurgiya) v 17 n 12 Dec 1979 p 968-970 CODEN: SPMCAV ISSN: 0038-5735 Lang.: Eng. A study was made of materials of the Al//2O// -Si//3N//4 system involving pressing and subsequent sintering in a nitrogen atmosphere. Addition of as little as 2. 8 mole % alumina trebles the mechanical strength. The increase is attributable to enhanced cohesion of silicon nitride particles by the mullite-like compound xAl//2O//3 X (TIMES) ySiO//2 during reaction of Al//2O//3 with SiO// surface films on the Si//3N//4 particles. Al//2O//3-Si//3N//4 electrode holders were subjected to tests in which their useful life was 25 times longer than holders made of porcelain. 4 refs. Desc.: *REFRACTORY MATERIALS; WELDING JIGS AND FIXTURES-- Manufacture Class. Codes: 812 (Ceramics & Refractories); 538 (Welding & Bonding); 604 (Metal Cutting & Machining) 81 (CHEMICAL PROCESS INDUSTRIES); 53 (METALLURGICAL ENGINEERING); 6? (MECHANICAL ENGINEERING) Y029008 100 0851530 E.I. Monthly No: EI7910076295 E.I. Yearly No: EI79011803 Crystallographic Characterization and Properties in the Solid Solution System Pb (Fe/Al/Ga)//1//2O//1//9. KRISTALLOGRAFISCHE CHARAKTERISIERUNG UND EIGENSCHAFTEN DES MISCHKRISTALLSYSTEMS Pb (Fe/Al/Ga)//1//2O//1//9. Klingeberg, Ruditha; Sahl, Kurt Ruhr-Univ Bochum, Ger Berichte der Deutschen Keramischen Gesellschaft v 56 n 3-4 Mar-Apr 1979 p 75-78 CODEN: BDKGAY ISSN: 0365-9542 Lang.: GERMAN Solid solutions of the plumbites are candidate materials for thin epitaxial films for bubble storage devices and microwave components. The variation of the crystallographic lattice constants and of the magnetic properties with the chemical composition was investigated. 19 refs. In German with English abstract. Desc.: *CERAMIC MATERIALS--*Ferroelectric; DATA STORAGE, MAGNETIC-- Storage Devices Class. Codes: 812 (Ceramics & Refractories); 722 (Computer Hardware); 81 (CHEMICAL PROCESS INDUSTRIES); 72 (COMPUTERS & DATA PROCESSING) Y029008 101 0844931 E.I. Monthly No: EI709070558 E.I. Yearly No: EI79045976 Microwave Circuits Produced by CMS Technology. MIKROWELLENSCHALTUNGEN NACH DEM CMS-VERFAHREN. Bogenschuetz, August F.; Jostan, Josef L.; Ostwald, Robert; Steiner, Ingo Wissenschaftliche Berihte AEG-Telefunken v 52 n 1-2 1979 p 71-77 CODEN: WBATB3 ISSN: 0043-6801 Lang.: GERMAN On the bases of investigations of strongly adherent nonconductor metallization and etching structures, a chemical metallizing system (CMS technology) was developed which is suitable for quantity production. This system allows the production of stripline circuits featuring a high Q factor, through-hole plating and integrated thin-film resistors. The point of departure are pure and smooth Al//2O//3 ceramic substrates which are provided with a preliminary thin adhesive film of highly conductive copper following special conditioning and surface activation. The resistor films made from a thin nickel-phosphorus alloy are likewise deposited by a wet chemical process. The resistance properties may be adjusted within wide limits by controlling the phosphor content of the alloy and the deposit conditions. 5 refs. In German with English abstract. Desc.: *INTEGRATED CIRCUIT MANUFACTURE--*Microwaves Ident.: MICROWAVE CIRCUITS; CMS TECHNOLOGY Class. Codes: 713 (Electronic Circuits); 714 (Electronic Components) 71 (ELECTRONICS & COMMUNICATIONS) Y029008 102 0844102 E.I. Monthly No: EI7908066187 E.I. Yearly No. EI79093564 GROWTH OF TiC HARD COATINGS OF HALIDE-ACTIVATED PACK CEMENTATION ON GRAPHITE AND STEEL. Reynaud, C.; Vandenbulcke, L.; Lefebvre, B.; Vuillard, G. CNRS, Orleans, Fr Proc of the Int Conf on Chem Vapor Deposition, 6th, Atlanta, Ga, Oct 9-14 1977 Publ by Electrochem Soc (Proc v 77-5), Princeton, NJ, 1977 p 382-388 Lang.: Eng. In the reported experiments, titanium carbide coatings were obtained on carbon containing materials, ranging from graphite to 0. 5% C steel by a pack cementation process activated by halides (Chloride or fluoride). Samples to be coated were packed with a cementation powder mixture containing titanium, alumina and a catalytic metal. The thickness of the coating was taken as the mean value of microscope measurements. Composition was obtained by electron microprobe analysis. On graphite, the kinetics of standard isotherm cementation activated by TiCl//4 or TiF//4 was studied between 1100 DEGREE and 1225 DEGREE C. The thickness of the TiC coating was observed to be directly proportional to the cementation duration. We deduced that the limiting step of kinetics was neither diffusion across the carbide nor diffusion in the gas phase, but displacement of Cr (or Fe) by Ti on the substrate. A mechanism is proposed for standard isotherm cementation. The process is governed by an heterogeneous CVD stage. 4 refs. Desc.: *TITANIUM AND ALLOYS--*Vapor Deposition; TITANIUM CARBIDE-- Physical Properties; COATING TECHNIQUES; STEEL--Protective Coatings; GRAPHITE--Protective Coating; CHEMICAL REACTIONS--Reaction Kinetics Ident.: CEMENTATION Class. Codes: 542 (Light Metals & Alloys); 482 (Mineralogy & Petrology); 539 (Metals Corrosion & Protection); 5?5 (Iron & Steel); 804 (Chemical Products); 931 (Applied Physics) 54 (METAL GROUPS); 48 (ENGINEERING GEOLOGY); 53 (METALLURGICAL ENGINEERING); 80 (CHEMICAL ENGINEERING); 93 (ENGINEERING PHYSICS) Y029008 103 0844066 E.I. Monthly No: EI7908065316 E.I. Yearly No: EI79082423 EFFECT OF SOME FABRICATION VARIABLES ON THE DIELECTRIC PROPERTIES OF REACTION BONDED SILICON NITRIDE. Perry, G. S.; Sant, J. H. At Weapons Res Establ, Reading, Berkshire, Engl Proc of the Symp on Electromagn Windows, 14th, Ga Inst of Technol, Atlanta, Jun 21-23 1978 sponsored by Ga Inst of Technol, Atlanta, 1978 p 131-139 Lang.: Eng. Silicon Nitride is a well established high temperature engineering ceramic which has considerable potential as a dielectric for radome applications. This paper reports on a series of systematic studies on the effects of fabrication variables on the dielectric properties of reaction bonded silicon nitride. All the dielectric measurements were made on circular specimens (0. 9 in. ) at a frequency of 9375 MHz using the shorted-line method. 10 refs. Desc.: *SILICON COMPOUNDS--*Dielectric Properties; RADAR--Radomes; CERAMIC MATERIALS; MICROWAVE MEASUREMENTS Ident.: SILICON NITRIDE Class. Codes: 804 (Chemical Products); 708 (Electric & Magnetic Materials); 942 (Electrical & Electronic Measuring Instruments); 812 (Ceramics & Refractories); 716 (Radar, Radio & TV Electronic Equipment); 80 (CHEMICAL ENGINEERING); 70 (ELECTRICAL ENGINEERING); 94 (INSTRUMENTS & MEASUREMENT); 81 (CHEMICAL PROCESS INDUSTRIES); 71 (ELECTRONICS & COMMUNICATIONS) Y029008 104 0842903 E.I. Monthly No: EI7908065715 E.I. Yearly No: EI79086901 NON-METALLIC INCLUSIONS IN STRANDS CAST ON HORIZONTAL CONTINUOUS-CASTING MACHINES. Besedina, E. B.; Mikhailova, I. V.; Maslenkov, S. B.; Shatagin, O. A.; Gubenko, E. P. Ukr SSR Res Inst of Met Steel in the USSR v 8 n 10 Oct 1978 p 560-562 CODEN: SUSRA5 ISSN: 0038-9218 Lang.: Eng. An increase was observed in inclusions in the upper zones of the section: ALPHA -alumina in carbon steels, titanium monoxide and titanium nitride in stainless steels, and nitrides of titanium and aluminium in nickel heat-resisting alloys. Argon purging of molten metal and copper-graphite molds made it possible to obtain a uniform distribution of oxides and nitrides. 3 refs. Desc.: *STEEL--*Continuous Casting; IRON AND STEEL METALLOGRAPHY-- Inclusions; NICKEL AND ALLOYS--Continuous Casting; NICKEL METALLOGRAPHY-- Inclusions Class. Codes: 545 (Iron & Steel); 531 (Metallurgy & Metallography); 548 (Nickel & Alloys) 54 (METAL GROUPS); 53 (METALLURGICAL ENGINEERING) Y029008 105 0831822 E.I. Monthly No: EI7907056358 E.I. Yearly No: EI79080041 MILLIMETER-WAVE IMPATT DIODE HERMETICALLY SEALED IN A MINIATURE CERAMIC PACKAGE. Nagao, Hiroyuki; Hasumi, Hideyo; Sekino, Toshiaki; Ohmori, Masamichi; Fujine, Nobuhiko NEC, Ltd, Tokyo, Jpn NEC Research & Development n 52 Jan 1979 p 33-7 CODEN: NECRAU ISSN: 0547-051X Lang.: Eng. A silicon double-drift-region IMPATT diode, which is hermetically sealed in a mechanically rugged ultra-miniature ceramic package, is described. The diode package accommodates a diamond heat sink for thermal resistance reduction. Output power of 100 to 150 mW has been obtained in the 80 GHz band with an efficiency of more than 4% and a junction temperature rise of less than 180 DEGREE C. The newly developed IMPATT diode is used as the pumping power source in practical microwave parametric amplifiers and IMPATT oscillators and amplifiers in millimeter-wave applications. This paper describes package design, diode fabrication and characteristics, including oscillator and amplifier performance. 4 refs. Desc.: *SEMICONDUCTOR DIODES, IMPATT--*Millimeter Waves Class. Codes: 714 (Electronic Components); 711 (Electromagnetic Waves) 71 (ELECTRONICS & COMMUNICATIONS) Y029008 106 0826940 E.I. Monthly No: EI7906048172 E.I. Yearly No: EI79094298 BROAD-BAND INTERNAL MATCHING OF MICROWAVE POWER GaAs MESFET's. Honjo, Kazuhiko; Takayama, Yoichiro; Higashisaka, Asamitsu NEC, Miyazaki, Kawasaki, Jpn IEEE Transactions on Microwave Theory and Techniques v MTT-27 n 1 Jan 1979 p 3-8 CODEN: IETMAB ISSN: 0018-9480 Lang.: Eng. Broad-band internal matching techniques for high-power GaAs MESFET's at a band have been developed, adopting novel circuit configurations and large-signal characterizations in the circuit design. The lumped-element two-section input matching network is formed on a single ceramic plate with a high dielectric constant. The semidistributed single-section output circuit is formed in microstrip pattern on an alumina plate. The internally matched GaAs FET with 11200- MU m total gate width has a 2. 5-W power output at ?-dB gain compression and a 4. 4-W saturated power output with 5. 5-dB linear gain from 4. 2 to 7. 2 GHz without external patching. The FET internally matched from 4. 5 to 6. 5 GHz exhibited 5-W saturated power output with 6-dB linear gain. 8 refs. Desc.: *TRANSISTORS, FIELD EFFECT--*Impedance Matching; ELECTRIC NETWORKS, LUMPED PARAMETER--Design; MICROSTRIP DEVICES Class. Codes: 701 (Electricity & Magnetism); 714 (Electronic Components); 703 (Electric Circuits) 70 (ELECTRICAL ENGINEERING); 71 (ELECTRONICS & COMMUNICATIONS) Y029008 107 0823348 E.I. Monthly No: EI7906041399 E.I. Yearly No: EI79021734 PRECISION MACHINING OF NON-METALLIC MATERIALS -- SOME PRACTICAL GUIDELINES. Juchem, H. O.; Wapler, H. De Beers Ind-Diamanten, Duesseldorf, Ger Ind Diamond Rev Feb 1979 p 43-50 CODEN: INDRA9 ISSN: 0019-8145 Lang.: Eng. Advice on the selection of diamond tool specifications and machining parameters to obtain optimum performance when machining alumina ceramics, silicon nitride, glass reinforced plastics, carbon and graphite workpieces to high precision, is presented and discussed. The practical examples and data presented here are designed to show under what conditions diamond tools are used for machining nonmetallic materials, and to point out the avenues toward further improvements and developments. 10 refs. Desc.: *CUTTING TOOLS--*Diamond; CERAMIC MATERIALS--Machining; PLASTICS, REINFORCED; SILICON COMPOUNDS Ident.: SILICON NITRIDE; ALUMINA CERAMICS Class. Codes: 603 (Machine Tools); 812 (Ceramics & Refractories); 604 (Metal Cutting & Machining); 817 (Plastics, Products & Applications); 816 (Plastics, Plant Equipment & Processes); 606 (Abrasives) 60 (MECHANICAL ENGINEERING); 81 (CHEMICAL PROCESS INDUSTRIES) Y029008 108 0820577 E.I. Monthly No: EI7906046421 E.I. Yearly No: EI79075143 SIALON REFRACTORIES FROM CLAY AND COAL. Cutler, I. B. Univ of Utah, Salt Lake City Annu Conf on Mater for Coal Convers and Util, 3rd, NBS, Gaithersburg, Md, Oct 10-12 1978 Publ by DOE, Washington, DC, 1978. Available from NTIS (CONF-781018), Springfield, Va p IV. 47-IV. 51 Lang.: Eng. Sialon, a solid solution of silicon nitride and aluminum oxynitride, can be obtained from clay and coal by reaction with nitrogen. Sialon can be sintered to near theoretical density much like alumina. A scheme for producing kilogram quantities of sialon in the form of powder and refractory brick has been devised and tested. Desc.: *REFRACTORY MATERIALS--*Manufacture Class. Codes: 812 (Ceramics & Refractoreis) 81 (CHEMICAL PROCESS INDUSTRIES) Y029008 109 0812681 E.I. Monthly No: EI7905031069 E.I. Yearly No: EI7011827 Characterization of the High Temperature Mechanical Properties of Ceramic Materials by Dynamic Measurement of Elastic Modulus up to 1400 DEGREE C. CHARAKTERISIERUNG DER MECHANISCHEN HOCHTEMPERATUREIGENSCHAFTEN KERAMISCHER WERKSTOFFE DURCH DYNAMISCHE ELASTIZITAETSMODULMESSUNGEN BIS 1400 DEGREE C. Lindner, Hans A.; Thoma, Hans Juergen BAK, Cremer-Gruppe, Roedental Berichte der Deutschen Keramischen Gesellschaft v 55 n 12 Dec 1978 p 515-517 CODEN: BDKGAY ISSN: 0365-9542 Lang.: GERMAN Dynamic measurements of elastic modulus in the temperature range from 25 DEGREE C to 1400 DEGREE C can be used for a rapid assessment of the temperature dependence of the mechanical properties of ceramic materials. The usefulness of the method is discussed using measurements on alumina, silicon nitride and silicon carbide as examples. 5 refs. In German with English abstract. Desc.: *CERAMIC MATERIALS--*High Temperature Effects Class. Codes: 812 (Ceramics & Refractories); 81 (CHEMICAL PROCESS INDUSTRIES) Y029008 110 0791110 E.I. Monthly No: EI7902010312 E.I. Yearly No: EI79048551 CONTINUOUS 3300 DEGREE F MICROWAVE KILN FOR CERAMIC RAW MATERIALS. Chiang, Bing; Hoyte, Alfred Microwave Fusion, Inc, Riverdale, Md Microwave Power Symp Digest, Ottawa, Ont, Jun 28-30 1978. Publ by Int Microwave Power Inst, Edmonton, Alberta, 1978 p 63-64 Lang.: Eng. A high temperature high power continuous kiln is discussed. The microwave power used was 36 kw and the temperature was sustained at 3300 DEGREE F, by directly heating the dielectrics. Desc.: *KILNS--*Microwaves; ELECTRIC HEATING, DIELECTRIC--Kilns Class. Codes: 642 (Industrial Furnaces & Process Heating); 711 (Electromagnetic Waves) 64 (HEAT & THERMODYNAMICS); 71 (ELECTRONICS & COMMUNICATIONS) Y029008 111 0791092 E.I. Monthly No: EI7902008769 E.I. Yearly No: EI79025131 AVALANCHE FAILURE OF GLASS AND STONEWARE PRODUCTS DURING NO LOAD MICROWAVE OVEN TESTS. Wirtz, Gerald; Ruhl, Roland L.; Segan, Ellen G. Univ of Ill, Urbana Microwave Power Symp Digest, Ottawa, Ont, Jun 28-30 1978. Publ by Int Microwave Power Inst, Edmonton, Alberta, 1978 p 9-10 Lang.: Eng. During " no load " testing of stoneware containers, it has been observed that many containers of typical household size can be elevated to such temperature extremes in local areas of " spots " that they emit radiation in the visible spectrum. In addition to structural failure, even melting of the container is possible. The microstructure composition of commercial and experimental ceramic ovenwave bodies, including triaxial porcelain as well as low expansion spodumene bodies was correlated with these effects. Microwave power dissipation is deduced to originate in the alkali silicate glass phase formed during vitrification of the ceramic body. Desc.: *ELECTRIC APPLIANCES--*Testing; ELECTRIC HEATING, DIELECTRIC --Microwaves Ident.: MICROWAVE OVENS Class. Codes: 704 (Electric Components & Equipment) 70 (ELECTRICAL ENGINEERING) Y029008 112 0788940 E.I. Monthly No: EI7902007652 E.I. Yearly No: EI79011854 CRYSTALLIZATION OF GRAIN BOUNDARY PHASES IN HOT-PRESSED SILICON NITRIDE MATERIALS -- 1. PREPARATION AND CHARACTERIZATION OF MATERIALS. Weston, J. E.; Pratt, P. L.; Steele, B. C. H. Imp Coll of Sci & Technol, London, Engl Journal of Materials Science v 13 n 10 Oct 1978 p 2137-2146 CODEN: JMTSAS ISSN: 0022-2461 Lang.: Eng. Multicomponent oxide additions were used to replace magnesia as the densification aid for hot-pressing silicon nitride and silicon nitride-alumina materials. Crystallization of the silicate glass phases present after hot-pressing was encouraged by the use of an in situ heat treatment process. The phase constitutions of the materials produced by this method were determined by using X-ray powder analysis. The kinetics of the densification of the silicon nitride materials were investigated, and these materials were examined using an X-ray diffractometer to study the textures produced by hot-pressing. 31 refs. Desc.: *CERAMIC MATERIALS--*Microstructure; CRYSTALLIZATION; SILICON COMPOUNDS Ident.: HOT-PRESSED CERAMICS; SILICON NITRIDE Class. Codes: 812 (Ceramics & Refractories); 421 (Materials Properties) 81 (CHEMICAL PROCESS INDUSTRIES); 42 (MATERIALS PROPERTIES & TESTING) Y029008 113 0788787 E.I. Monthly No: EI7902012004 E.I. Yearly No: EI79071364 SINTERING BEHAVIOR OF ALUMINUM NITRIDE SYNTHESIZED IN LOW-TEMPERATURE PLASMA. Kuzenkova, M. A.; Kislyi, P. S.; Makarenko, G. N.; Zyatkevich, D. P.; Kosolapova, T. Ya.; Miller, T. N.; Grabis, Ya. P. Acad of the Ukr SSR, Inst of Mater Sci Soviet Powder Metallurgy and Metal Ceramics (English translation of Poroshkovaya Metallurgiya) v 17 n 4 Apr 1978 p 272-275 CODEN: SPMCAV ISSN: 0038-5735 Lang.: Eng. Up to 1600 DEGREE C the densification of the ultrafine powders involved no grain growth, whereas during the sintering of the ordinary aluminum nitride powder shrinkage was accompanied by recrystallization. With the ultrafine aluminum nitride powders, grain growth commenced after densification to a virtually nonporous condition at temperatures above 1650 DEGREE C, and consisted in new, acicular-shaped grains increasing in size. 15 refs. Desc.: *POWDER METALLURGY--*Sintering; ALUMINUM COMPOUNDS--Chemical Reactions Ident.: ALUMINUM NITRIDE Class. Codes: 536 (Powder Metallurgy); 804 (Chemical Products) 802 (Chemical Apparatus & Plants); 541 (Aluminum & Alloys) 53 (METALLURGICAL ENGINEERING); 80 (CHEMICAL ENGINEERING); 54 (METAL GROUPS) Y029008 114 0783824 E.I. Monthly No: EI7901001711 E.I. Yearly No: EI79026877 SURVEY OF MICROWAVE COOKWARE. Campanella, P. F. Corning Glass Works, NY Journal of Microwave Power v 13 n 1 Mar 1978 p 43-45 CODEN: JLMPAB ISSN: 0022-2739 Lang.: Eng. In general, glass, glass-ceramic, paper and plastic cookware may be used in microwave cooking -- although some limitations exist. Metal cookware is generally not recommended for microwave cooling. Limitations of the various materials and general rules for microwave cookware selection are discussed. Desc.: *ELECTRIC HEATING, DIELECTRIC--*Microwaves; FOOD PRODUCTS-- Processing; CONTAINERS--Microwaves; ELECTRIC APPLIANCES--Microwaves Ident.: MICROWAVE OVENS; COOKWARE Class. Codes: 711 (Electromagnetic Waves); 822 (Food Technology); 704 (Electric Components & Equipment); 691 (Bulk Materials Handling) 71 (ELECTRONICS & COMMUNICATIONS); 82 (AGRICULTURE & FOOD TECHNOLOGY); 70 (ELECTRICAL ENGINEERING); 69 (MATERIALS HANDLING) Y029008 115 0776078 E.I. Monthly No: EI7804025142 GRAIN-SIZE EFFECTS ON MICROWAVE FERRITE MAGNETIC PROPERTIES. Inui, Tetsuh; Ogasawara, Naoyuki Nippon Electr Co, Ltd, Kawasaki, Jpn IEEE Transactions on Magnetics v MAG-?3 n 6 Nov 1977 p 1729-1744 CODEN: IEMGAQ ISSN: 0018-9464 Lang.: Eng. A review is presented of polycrystalline microwave ferrites with specific reference made to the grain size. Fine-grained and large-grained ferrites as referred to in this article stand for the ferrites with an average grain size of 2 MU m or less and those of 100 MU m or larger respectively. Fine-graining of ferrites is one of the state-of-the-arts techniques for obtaining high-power ferrites. Large-graining is a newly developed technique for further improving the family of narrow resonance linewidth garnet materials. Starting with some ceramics-oriented topics including the definition of the average grain-size and so forth, the present review covers the grain-size dependence of initial permeability and the grain-size dependence of microwave properties ( DELTA H, DELTA H//e//f//f, and DELTA H//k) both in the theoretical and in the experimental phases. Successful device applications of newly developed " single-crystal-like " large-grained ferrites are also reviewed. 118 refs. Desc.: *FERRITES--*Magnetic Properties Ident.: MICROWAVE FERRITES Class. Codes: 708 (Electric & Magnetic Materials) 70 (ELECTRICAL ENGINEERING) Y029008 116 0769671 E.I. Monthly No: EI7812088311 NONDESTRUCTIVE MICROWAVE EVALUATION OF CERAMICS. Bahr, Alfred J. Stanford Res Inst, Int, Remote Meas Lab, Menlo Park, Calif IEEE Transactions on Microwave Theory and Techniques v MTT-2? n 9 Sep 1978 p 676-683 CODEN: IETMAB ISSN: 0018-9480 Lang.: Eng. The ability of microwave energy to penetrate some kinds of ceramic materials at frequencies of 100 GHz and above suggests that microwave techniques may be useful for the nondestructive evaluation (NDE) of such materials. This paper presents experimental results that demonstrate the basic feasibility of using these techniques to detect and locate various types of inclusions (including voids) in silicon nitride Si//3N//4. Inclusions as small as 0. 005 in diameter have been detected. 12 refs. Desc.: *CERAMIC MATERIALS--*Testing; MICROWAVE MEASUREMENTS; SILICON COMPOUNDS--Measurements Ident.: NONDESTRUCTIVE EVALUATION; SILICON NITRIDE Class. Codes: 812 (Ceramics & Refractories); 942 (Electrical & Electronic Measuring Instruments); 804 (Chemical Products) 81 (CHEMICAL PROCESS INDUSTRIES); 94 (INSTRUMENTS & MEASUREMENT); 80 (CHEMICAL ENGINEERING) Y029008 117 0766996 E.I. Monthly No: EI781208285 E.I. Yearly No: EI78011110 EFFECTS OF CHEMICAL TREATMENT ON LOSS QUALITY OF MICROWAVE DIELECTRIC CERAMICS. O'Bryan, H. M. Jr.; Thomson, J.; Plourde, J. K. Bell Lab, Murray Hill, NJ Berichte der Deutschen Keramischen Gesellschaft v 55 n 7 Jul 1978 p 348-351 CODEN: BDKGAY ISSN: 0365-9542 Lang.: Eng. The loss quality Q of Ba//2Ti//9O//2//0 and BaTi//4O//9 ceramics is improved greatly by a chemical treatment of the calcined powder prior to sintering. Acid leaching selectively dissolves certain Ba-rich compounds present in the calcined powders. These compounds, formed as reaction intermediates during calcination, melt below the sintering temperature of the ceramic. Microstructural evidence has been found for the formation of a liquid phase in ceramics prepared from unleached powders. 5 refs. Desc.: *CERAMIC MATERIALS--*Dielectric Properties Class. Codes: 708 (Electric & Magnetic Materials); 812 (Ceramics & Refractories) 70 (ELECTRICAL ENGINEERING); 81 (CHEMICAL PROCESS INDUSTRIES) Y029008 118 0766116 E.I. Monthly No: EI7812089920 E.I. Yearly No: EI78032213 SOME PROPERTIES OF INSULATING PROTECTIVE FILMS ON OXIDIZED SILICON IN A BIOLOGICAL ENVIRONMENT. Tschulena, G.; Ganso, G.; Holz, A.; Sdunzig, H. Battelle-Inst, Frankfurt AM, Ger Proc of the Int Vac Congr, 7th, and the Int Con on Solid Surf, 3rd, of the Int Union for Vac Sci, Tech and Appl, Vienna, Austria, Sep 12-16 1977 Publ by Int Union for Vac Sci, Tech and Appl, Brussels, Belg, 1977 v 3 p 2035-2037 Lang.: Eng. Thin insulating films were investigated with respect to their applicability to bioelectrical sensors which will be based on integrated circuit technology. The main effort is directed toward the development of ion-barrier layers on silicon substrates in order to protect silicon devices in a biological environment from sodium ions. The selection criteria for the insulating layers are a low interface state density on silicon, a sodium diffusion rate as small as possible, long-time stability in physiological saline solution, and long-time stability in vivo, i. e. after subcutaneous implantation in rats. Layers of silicon nitride, alumina, and tantalum oxide have been sputtered on oxidized silicon substrates. 10 refs. Desc.: *FILMS--*Dielectric; SENSORS; BIOMEDICAL EQUIPMENT; DIELECTRIC MATERIALS--Thin Films Class. Codes: 462 (Medical Engineering & Equipment); 708 (Electric & Magnetic Materials) 46 (BIOENGINEERING); 70 (ELECTRICAL ENGINEERING) Y029008 119 0766017 E.I. Monthly No: EI7812089173 E.I. Yearly No: EI78021765 CRYSTALLIZATION OF DIELECTRIC FILMS ON SEMICONDUCTORS. Alexandrov, L. N.; Edelman, F. USSR Acad of Sci, Inst of Semicond Phys, Novosibirsk Proc of the Int Vac Congr, 7th and the Int Conf on Solid Surf, 3rd, of the Int Union for Vac Sci, Tech and Appl, Vienna, Austria, Sep 12-16 1977 Publ by Int Union for Vac Sci, Tech and Appl, Brussels, Belg, 1977 v 2 p 1619-1622 Lang.: Eng. Consideration is given to structural transformations in thin dielectric films on silicon: silica, silicon nitride, alumina and others. Kinetics of film crystallization are discussed relative to heat treatment in a vacuum. The " amorphous film-crystal " transition is analysed using the data on a short-range order in films. The process of crystallization is accompanied with relevant changes in IR transmission spectra. It is shown that a silicon surface stimulates nucleation. 10 refs. Desc.: *DIELECTRIC MATERIALS--*Thin Films; SEMICONDUCTOR MATERIALS Class. Codes: 702 (Electric Batteries & Fuel Cells); 712 (Electronic & Thermionic Materials) 70 (ELECTRICAL ENGINEERING); 71 (ELECTRONICS & COMMUNICATIONS) Y029008 120 0763170 E.I. Monthly No: EI7811080168 E.I. Yearly No: EI78011158 STRESS RUPTURE EVALUATIONS OF HIGH TEMPERATURE STRUCTURAL MATERIALS. Charles R. J. GE, Corp Res & Dev, Schenectady, NY Fract Mech of Ceram, v 4, Int Symp on Fract Mech of Ceram, Proc, Pa State Univ, University Park, Jul 27-29 1977 Publ by Plenum Press, New York, NY and London, Engl, 1978 p 623-638 Lang.: Eng. Data is presented on the stress rupture characteristics of a number of metals and ceramics in terms of a model based on diffusion controlled, intergranular crack growth. Due to the limited experimental data available on the stress rupture behavior of ceramics and in order to substantiate the analytical procedures indicated by the model, a number of well documented metal and alloy systems are first analyzed. Estimates of the long term performance of alumina and various forms of silicon nitride and silicon carbide are made from available data and compared with the metal and alloy results. 32 refs. Desc.: *CERAMIC MATERIALS--*Fracture; ALUMINA-- High Temperature Effects Class. Codes: 812 (Ceramics & Refractories) 81 (CHEMICAL PROCESS INDUSTRIES) Y029008 121 0763165 E.I. Monthly No: EI7811079536 E. I. Yearly No: EI78003509 EROSION OF BRITTLE MATERIALS BY SOLID PARTICLE IMPACT. Hockey, B. J.; Wiederhorn, S.; Johnson, H. NBS, Inst for Mater Res, Washington, DC Fract Mech of Ceram, v 3, Int Symp on Fract Mech of Ceram, Proc, Pa State Univ, University Park, Jul 27-29 1977 Publ by Plenum Press, New York, NY and London, Engl, 1978 p 379-402 Lang.: Eng. Results are presented which show, that in addition to fracture, plastic deformation occurs and plays an important role in the erosion of brittle materials by solid particle impact. These conclusions are supported by transmission electron microscopy studies of impact damage produced in a wide variety of brittle materials and by erosive wear studies on silicon nitride and alumina. The erosive wear studies also indicate that while erosion resistance is primarily determined by fracture toughness and hardness, the relative importance of these materials parameters depends on the test conditions. 16 refs. Desc.: *ALUMINA--*Erosion; GLASS--Testing Class. Codes: 812 (Ceramics & Refractories) 81 (CHEMICAL PROCESS INDUSTRIES) Y029008 122 0760780 E.I. Monthly No: I7811081999 E.I. Yearly No: EI78029032 FABRICATION OF DIELECTRIC SUBSTRATES FOR MICROWAVE BEAM-FORMING NETWORK LENSES. Maguire, Edward A. Jr.; Readey, Dennis W. Raytheon Co, Res Div, Waltham, Mass American Ceramic Society Bulletin v 57 n 6 Jun 1978 p 565-567 CODEN: ACSBA7 ISSN: 0002-7812 Lang.: Eng. Insufficient green strength in the ceramic powder was the limiting factor in fabricating one-piece ceramic lenses as large as 12 by 12 in. for beam-forming networks. Organic binders were used to improve the green strength of BaTi//4O//9, with a combination of polyvinyl alcohol and polyethylene glycol providing the needed improvement. Pieces were prouced by pressing and casting techniques with green strengths > 500 psi. Sintered pieces were used successfully in lenses. 3 refs. Desc.: *ELECTRON LENSES--*Manufacture; MICROWAVE DEVICES-- Manufacture; ANTENNAS--Phased Arrays Class. Codes: 714 (Electronic Components); 715 (General Electronic Equipment); 716 (Radar, Radio & TV Electronic Equipment) 71 (ELECTRONICS & COMMUNICATIONS) Y029008 123 0757947 E.I. Monthly No: EI781085349 E.I. Yearly No: EI78077043 CERAMIC HUMIDITY SENSOR " HUMICERAM " . Nitta, Tsuneharu; Terada, Ziro; Kanazawa, Takato Matsushita Electr Ind Co, Mater Res Lab, Moriguchi, Osaka, Jpn Natl Tech Rep Matsushita Electr Ind v 24 n 3 Jun 1978 p 422-435 CODEN: NTROAV ISSN: 0028-0291 Lang.: JAPANESE This paper describes the ceramic humidity sensor " Humiceram, " which has been put into practical use as a cooking-control element for microwave ovens. It is used in severely contaminated environments containing oil and other organic vapors, soys, water, etc. Many commercially available sensors detect water absorbed in their thin surface layer. The " Humiceram, " however, detects water absorbed throughout its bulk, thus making it less subject to the effect of surface contamication and more stable than the surface-layer type. It has a quick response nearly equal to that of the surface-layer type. The " Humiceram " is small (sensor size: 4 X 5 X 0. 25 mm) and has a high humidity sensitivity (1 to 100% R, 1 DEGREE to 150 DEGREE C). With a unique heat-cleaning device for its surface, the " Humiceram " avoids performance deterioration caused by extremely severe contamination, and is stable for a long period of operation. In addition to microwave ovens the " Humiceram " is expected to be used in many fields requiring humidity control. 34 refs. In Japanese with English abstract. Desc.: *SENSORS; ATMOSPHERIC HUMIDITY; MICROWAVE DEVICES; CERAMIC PRODUCTS Ident.: MICROWAVE OVENS; COOKING-CONTROL ELEMENT Class. Codes: 732 (Control Devices); 714 (Electronic Components); 715 (General Electronic Equipment); 812 (Ceramics & Refractories); 73 (CONTROL ENGINEERING); 71 (ELECTRONICS & COMMUNICATIONS); 81 (CHEMICAL PROCESS INDUSTRIES) Y029008 124 0749936 E.I. Monthly No: EI7810071774 E.I. Yearly No: EI78008785 NEW APPROACH TO BLAST FURNACE STACK LININGS. Hiragushi, Keisuke; Mizutani, Kichizo; Nagai, Tadahiro Nippon Steel Corp, Yawata Works, Kitakyushu-Shi, Jpn Iron and Steel Engineer v 55 n 6 Jun 1978 p 47-53 CODEN: IRSEA5 ISSN: 0021-1559 Lang.: Eng. A new alkali vapor testing method provides quantitative evaluation in the laboratory. When refractories slected by the new method were laid in panels in an actual blast furnace, brick wear evaluation was obtained which coincided with laboratory evaluation. Silicon carbide refractories are available as alkali-resistant refractories. This type of refractory greatly varies in alkali resistance depending on bond used. Silicon nitride bonds provided to be the best. The alkali resistance of alumina silica-type refractories increases as the alumina content increases. 7 refs. Desc.: *BLAST FURNACES--*Refractory Materials Class. Codes: 532 (Metallurgical Furnaces) 53 (METALLURGICAL ENGINEERING) Y029008 125 0740589 E.I. Monthly No: EI7808059900 E.I. Yearly No: EI78060767 HIGHLY STABILIZED LOW-NOISE GaAs FET INTEGRATED OSCILLATOR WITH A DIELECTRIC RESONATOR IN THE C BAND. Abe, Hiroyuki; Takayama, Yoichiro; Higashisaka Asamitsu; Takamizawa, Hideo Nippon Electr Co, Ltd, Cent Res Lab, Kawasaki, Jpn IEEE Transactions on Microwave Theory and Techniques v MTT-26 n 3 Mar 1978 p 156-162 CODEN: IETMAB ISSN: 0018-9480 Lang.: Eng. This paper describes the design, fabrication procedure and performance of a GaAs FET integrated oscillator stabilized with a BaO-TiO//2 system ceramic dielectric resonator. It provides a high-frequency-stabilized low-noise compact microwave power source. The newly developed ceramic has an expansion coefficient and dielectric constant temperature coefficient that offset each other and result in a small resonant frequency temperature coefficient. A stabilized oscillator output of 100 mW with a 17-percent efficiency and a frequency temperature coefficient as low as 2. 3 ppm/ DEGREE C are obtained at 6 GHz. FM noise level is reduced more than 30 dB by the stabilization. The dynamic properties of the oscillator and resonator are precisely measured to determine equivalent circuit representations. A large-signal design theory based on these equivalent circuit representations is presented to realize the optimal coupling condition between the oscillator and stabilizing resonator. The stabilized oscillator performance is sufficient for application to microwave communications systems. 8 refs. Desc.: *OSCILLATORS, MICROWAVE--*Design; RESONATORS; TRANSISTORS, FIELD EFFECT--Applications; CERAMIC MATERIALS--Applications; INTEGRATED CIRCUITS--Microwaves; MATHEMATICAL MODELS Ident.: DIELECTRIC RESONATOR Class. Codes: 713 (Electronic Circuits); 714 (Electronic Components); 812 (Ceramics & Refractories) 71 (ELECTRONICS & COMMUNICATIONS); 81 (CHEMICAL PROCESS INDUSTRIES) Y029008 126 0734466 E.I. Monthly No: EI7808055596 E.I. Yearly No: EI78010049 Properties of Ceramic Monolithic Capacitors at Frequencies up to 1 GHz. WLASCIWOSCI CERAMICZNYCH KONDENSATOROW MONOLITYCZNYCH PRZY CZESTOTLIWOSCIACH DO 1 GHz. Chlopek, Jan; Przybysz, Czeslaw Elektronika v 18 n 7-8 1977 p 276-278 CODEN: EKNTBZ ISSN: 0033-2089 Lang.: POLISH Results of measurements of monolithic ceramic capacitors produced in Poland, in the frequency region up to 1. 2 GHz, are presented. Capacitors ranging from 1. 2 to 68 pf, with 5% or 10% tolerance and operating voltage of 63 v were measured under conditions of room temperature. 6 refs. In Polish. Desc.: *CAPACITORS, CERAMIC--*Measurements; MICROWAVE MEASUREMENTS --Capacitance Class. Codes: 714 (Electronic Components); 942 (Electrical & Electronic Measuring Instruments) 71 (ELECTRONICS & COMMUNICATIONS); 94 (INSTRUMENTS & MEASUREMENT) Y029008 127 0732985 E.I. Monthly No: EI7807050788 E.I. Yearly No: EI78044003 ELECTRICAL AND CHEMICAL REQUIREMENTS OF HIGH ALUMINA SUBSTRATES USED IN MICROSTRIP APPLICATIONS. Class, Walter Mater Res Corp, Orangeburg, NY Proc Tech Program Natl Electron Packag Prod C of Anaheim, Calif, Mar 1-3 1977 Philadelphia, Pa, May 17-19 1977. Publ by Ind and Sci Conf Manage, Chicago, Ill, 1977 p 432-440 CODEN: NEPPAL ISSN: 0470-0155 Lang.: Eng. When an alumina substrate is used in a " pure " thin film hybrid application, it acts simply as a carrier for the circuit and components. In such applications, substrate parameters such as thermal conductivity (for power dissipation and resistor stability), flatness (for pattern definition and packaging), chemistry (for strength, adhesion and surface smoothness) are of importance. In microstrip applications, the substrate assumes an electrically active role in that substrate parameters such as dielectric constant and thickness, in part, determine the microwave propagation and circuit impedance characteristics. This work deals with the effect which ceramic parameters such as chemistry, density and grain have on the resulting microstrip circuit characteristics. 2 refs. Desc.: *INTEGRATED CIRCUITS, HYBRID Ident.: MICROSTRIPS Class. Codes: 713 (Electronic Circuits); 714 (Electronic Components) 71 (ELECTRONICS & COMMUNICATIONS) Y029008 128 0732947 E.I. Monthly No: EI7807049593 E.I. Yearly No: EI78029709 PROCEEDINGS OF THE TECHNICAL PROGRAM, NATIONAL ELECTRONIC PACKAGING AND PRODUCTION CONFERENCE, 1977. Anon Ind and Sci Conf Manage, Chicago, Ill Proc Tech Program Natl Electron Packag Prod Conf Anaheim, Calif, Mar 1-3 1977 Philadelphia Pa, May 17-19 1977. Publ by Ind and Sci Conf Manage, Chicago, Ill, 1977 508 p CODEN: NEPPAL ISSN: 0470-0155 Lang.: Eng. This symposium of 68 papers covers the following topics: Improved multilayer performance with new laminate materials; practical applications of photochemical machining; chip carrier systems in ceramic and plastics; Use of evaluation of fiber optics in electronic systems; flexible circuits -- reliability through design and testing; surface finishes for quality soldering; cost consideration and economic control in circuit manufacturing; a survey of industry-wide circuit testing set-up; artwork generation; current trends in PC board manufacture and soldering; soldering -- procedure and materials; reduction of setup costs for ATE; thermal problems; microwave packaging; and, multiplex wiring impact on packaging connectors. Selected papers are indexed separately. Desc.: *ELECTRONIC PACKAGING; PRINTED CIRCUITS; INTEGRATED CIRCUITS ; ELECTRIC CONNECTORS; HEAT PIPES; SOLDERING Class. Codes: 538 (Welding & Bonding); 641 (Heat & Thermodynamics); 703 (Electric Circuits); 713 (Electronic Circuits); 714 (Electronic Components); 715 (General Electronic Equipment) 53 (METALLURGICAL ENGINEERING); 64 (HEAT & THERMODYNAMICS); 70 (ELECTRICAL ENGINEERING); 71 (ELECTRONICS & COMMUNICATIONS) Y029008 129 0730766 E.I. Monthly No: EI7807048827 E.I. Yearly No: EI78022216 THICK FILM NICKEL CONDUCTORS FOR DC GAS DISCHARGE DISPLAYS. Anon Information Display v 13 Spring 1977 p 24-26 CODEN: INFDAB Lang.: Eng. Planar format versions of DC plasma displays have provided an incentive for the use of thick-film materials to produce numeric and alphanumeric display panels. Manufacturers initially fabricated planar numeric displays from thick-film nickel and dielectric compositions, which they fired on ceramic substrates at relatively high (850-1000 DEGREE C) temperatures in inert or reducing atmospheres. In recent years, plasma display producers have adopted soda-lime glass to support the transparent tin oxide on face plates. A soda-lime cathode-supporting substrate, in addition to its cost advantage over ceramic, provides a perfect thermal match for the face plate. A low-firing, nickel-conductor composition has been developed, processable on soda-lime glass to form cathodes. It also makes available compatible dielectric and silver compositions for the air fireable nickel metallization. Of special significance, firing in a conventional air-flow belt furnace eliminates the need for atmosphere control. 15 refs. Desc.: *DISPLAY DEVICES; ELECTRIC CONDUCTORS--Thick Films Ident.: GAS DISCHARGE DISPLAYS Class. Codes: 722 (Computer Hardware); 741 (Optics & Optical Devices); 704 (Electric Components & Equipment) 72 (COMPUTERS & DATA PROCESSING); 74 (OPTICAL TECHNOLOGY); 70 (ELECTRICAL ENGINEERING) Y029008 130 0730022 E.I. Monthly No: EI7807050663 E.I. Yearly No: EI78042430 MICROWAVE PROCESS SYSTEMS -- TECHNICAL ADVANCES AND PROBLEMS. Tinga, W. R. Univ of Alberta, Edmonton Int Congr on Electro-Heat, 8th, Pap and Abstr, Liege, Belg, Oct 11-15 1976 Publ by Int Union for Electro-Heat, Paris, Fr, 1976 Sect III, pap 13, 40 p Lang.: Eng. A limited qualitative review is presented of microwave processing technology. Technical advances in controlled microwave-air combination processing are illustrated via examples of vulcanizing, meat tempering, food sterilization, and noodle drying machines. Microwave safety features such as door seals, automatic radiation monitors, and interlocks are briefly discussed. Various solutions to the nonuniform heating problem are illustrated by means of a giant tire microwave preheater and a near-field applicator used for match-head drying. Microwave browning of foods, achievement of extremely high temperatures in oxides and ceramics, increasing microwave system reliability, high-speed processing of filamentary materials, and temperature monitoring in microwave fields are reviewed. Some further application such as microwave press-setting of pencils, pea protein sterilization, microwave asphalt road repair, weed control and seed germination by microwaves, an 'electronic bandage', economics of microwave processing, and the concept of a microwave satellite solar power station are commented on. 57 refs. Desc.: *INDUSTRIAL HEATING--*Microwave; MICROWAVE DEVICES Class. Codes: 642 (Industrial Furnaces & Process Heating); 711 (Electromagnetic Waves); 714 (Electronic Components); 715 (General Electronic Equipment) 64 (HEAT & THERMODYNAMICS); 71 (ELECTRONICS & COMMUNICATIONS) Y029008 131 0721339 E.I. Monthly No: EI7806046149 E.I. Yearly No: EI7085202 Development of Anisotropic Superconducting Ceramics (Na** PLUS BETA Al//2O//3) by Microwave Heating. ELABORATION DE CERAMIQUES SUPERCONDUCTRICES ANISOTROPES (Na** PLUS BETA Al//2O//3) PAR CHAUFFAGE MICROONDES. Colomban, Ph.; Badot, J. C. Ec Natl Super de Chem, paris, Fr Materials Research Bulletin v 13 n 2 Feb 1978 p 135-139 CODEN: MRBUAC ISSN: 0025-5408 Lang.: FRENCH The structure and properties of many superionic conductors are anisotropic. Application of these compounds in the form of ceramics requires high electrical conductivity, and this property depends on the orientation of the crystallites in the ceramics. Microwave energy (2. 45 GHz) is used for the sintering of BETA alumina ceramics. Systematic orientation of BETA alumina platelets is checked by X-rays and microscopy. 11 refs. In French. Desc.: *SUPERCONDUCTING MATERIALS; CERAMIC MATERIALS--Sintering; ELECTRIC HEATING; MICROWAVES; CRYSTALS--Orientation Class. Codes: 708 (Electric & Magnetic Materials); 812 (Ceramics & Refractories); 642 (Industrial Furnaces & Process Heating); 711 (Electromagnetic Waves); 933 (Solid State Physics) 70 (ELECTRICAL ENGINEERING); 81 (CHEMICAL PROCESS INDUSTRIES); 64 (HEAT & THERMODYNAMICS); 71 (ELECTRONICS & COMMUNICATIONS); 93 (ENGINEERING PHYSICS) Y029008 132 0720468 E.I. Monthly No: EI780645034 E.I. Yearly No: EI78072291 TEMPERATURE-STABLE DIELECTRIC RESONATORS REPLACE EXPENSIVE INVAR, BOOST Q IN M?Cs. Bearse, Stacy V.; Herbaugh, Robert E. Microwaves v 16 n 12 Dec 1977 p 14, 16, 18 CODEN: MCRWAR ISSN: 0026-2919 Lang.: Eng. A new ceramic, a special compound of barium titanate, was developed for use as a dielectric resonator. The material will allow the designer to reduce the size and cost of high-performance waveguide filters and, for the first time, provide the designers of microwave integrated circuits with a thermally stable, high-Q resonator. Desc.: *RESONATORS--*Microwaves; INTEGRATED CIRCUIT MANUFACTURE; BARIUM TITANATE; CERAMIC MATERIALS--Dielectric Properties Class. Codes: 714 (Electronic Components); 712 (Electronic & Ther?ionic Materials); 812 (Ceramics & Refractories); 713 (Electronic Circuits) 71 (ELECTRONICS & COMMUNICATIONS); 81 (CHEMICAL PROCESS INDUSTRIES) Y029008 133 0714642 E.I. Monthly No: EI7805035732 E.I. Yearly No: EI78056333 PHASE METHOD OF MICROWAVE FLAW DETECTION OF PIEZOCERAMIC MANUFACTURED ARTICLES. Marchuk, G. M.; Rudakov, V. N. Leningrad Electrotech Inst, USSR Soviet Journal of Nondestructive Testing (English translation of Defektoskopiya) v 13 n 2 Mar-Apr 1977 p 197-200 CODEN: SJNTAB ISSN: 0038-5492 Lang.: Eng. Distributed and vocal defects (nonuniformities in density and thickness) in materials with high dielectric constant (piezoelectric ceramics) are investigated using the phase method of microwave flaw detection. 4 refs. Desc.: *NONDESTRUSTIVE EXAMINATION--*Microwaves; PIEZOELECTRIC MATERIALS--Measurements Class. Codes: 421 (Materials Properties); 422 (Materials Testing); 708 (Electric & Magnetic Materials); 711 (Electromagnetic Waves); ?42 (MATERIALS PROPERTIES & TESTING); 70 (ELECTRICAL ENGINEERING); 71 (ELECTRONICS & COMMUNICATIONS) Y029008 134 0707253 E.I. Monthly No: EI7804025126 E.I. Yearly No: EI78031433 MICROWAVE ABSORPTION AND STATIC MAGNETIC PROPERTIES OF COPRECIPITATED BARIUM FERRITE. Roos, W.; Haak, H.; Voigt, C.; Hempel, K. A. Inst fuer Werkstoff der Elektrotech, Rheinish Westfael Tech Hochsch, Aachen, Ger J Phys (Paris), Colloq n C-1, Suppl au J Phys (Paris) v 38 n 4 Apr 1977, Int Conf on Ferrites, 2nd, Bellevue, Fr, Sep 14-17 1976 p C1. 35-C1. 37 CODEN: JPQCAK ISSN: 0449-1947 Lang.: Eng. The resonance absorption in negative field, predicted by the single domain theory, has been found. The coercive force //jH//c and the saturation magnetization SIGMA //s can be improved with acid treatment, values of //jH//c = 6400 Oe and SIGMA //s = 70. 7 emu/g are obtained. Both conventional sintering and rapid hot-pressing lead to a high density and good magnetic properties. A density of RHO = 5. 02 g/m**3 and a maximum energy product of (BH) (maximum) = 1. 4 MGOe were achieved by rapid hot-pressing. 5 refs. Desc.: *FERRITES--*Magnetic Properties Class. Codes: 708 (Electric & Magnetic Materials) 70 (ELECTRICAL ENGINEERING) Y029008 135 0696210 E.I. Monthly No: EI7802008237 E.I. Yearly No: EI78007823 Properties of Bird Feathers as Piezoelectric Transducers and as Receptors of Microwave Radiation. LES PROPRIETES DES PLUMES D'OISEAU EN TANT QUE TRANSDUCTEURS PIEZO-ELECTRIQUES ET RECEPTEURS DE MICRO-ONDES. Bigu Del Blanco, J; Romero Sierra, Cesar Univ Queens, Kingston, Ont Onde Electrique v 57 n 8-9 Aug-Sep 1977 p 532-536 CODEN: ONELAS ISSN: 0030-2430 Lang.: FRENCH An investigation was made of the properties of bird feathers as piezoelectric transducers in the audiofrequency range and as dielectric receptors of electromagnetic radiation in the microwave region. In the first case, cartridges of the ceramic and magnetic type and an electromagnetic transducer probe were used as detecting devices. Results show piezoelectric resonances in the 1-20 kHz region for the calami of feathers. The characteristics of bird feathers, as receptors of microwave fields, were studied in the 10-16 GHz region. Experiments were conducted coupling the specimen (feather) to a length of waveguide which served, together with other microwave components, as a primary detector. Microwave power radiation patterns were measured both in the presence and in the absence of the specimen. Results indicated a substantial increase in the microwave power collected in the forward direction, and a decrease of the radiation pattern beamwidth when the feather was present. Furthermore, some experimental evidence indicated the possibility of inducing piezoelectric effects in the specimen by audiofrequency pulse-modulated microwave fields. These results are important in view of the fundamental role that feathers play in the life of birds, and the influence of environmental factors on bird behavior. 21 refs. In French. Desc.: *BIOMEDICAL ENGINEERING--*Bioelectrical Phenomena; PIEZOELECTRIC TRANSDUCERS; MICROWAVES Ident.: FEATHERS Class. Codes: 461 (Biotechnology); 711 (Electromagnetic Waves) 704 (Electric Components & Equipment) 46 (BIOENGINEERING); 71 (ELECTRONICS & COMMUNICATIONS); 70 (ELECTRICAL ENGINEERING) Y029008 136 074461 E.I. Monthly No: EI7712094506 E.I. Yearly No: EI77088705 Thermo-emf of High-Dispersion Titanium Nitride. TERMO-E. D. S. VYSOKODISPERSNOGO NITRIDA TITANA. Domashnev, I. A.; Troitskii, V. N.; Grebtsov, B. M.; Kurkin, E. N. Acad of Sci of the USSR Izvestiya Akademii Nauk SSSR, Neorganicheskie Materialy v 13 n 6 Jun 1977 p 1025-1026 CODEN: IVNMAW ISSN: 0002-337X Lang.: RUSSIAN A study was made of the thermo-emf of granulated compact titanium nitride samples with a mean particle size of about 500 A which were synthesized in a microwave discharge plasma. It was found that after annealing at 1000 DEGREE K the thermo-emf of these samples is increased almost fivefold in comparison with that of sintered samples. 4 refs. In Russian. Desc.: *TITANIUM COMPOUNDS; POWDER METAL PRODUCTS-- Electric Properties Class. Codes: 804 (Chemical Products); 536 (Powder Metallurgy) 80 (CHEMICAL ENGINEERING); 53 (METALLURGICAL ENGINEERING) Y029008 137 0667233 E.I. Monthly No: EI7711081393 E. I. Yearly No: EI77028688 FAILURE OF AN ALUMINA-TO-COPPER SEALED ELECTRON TUBE. Viechnicki, Dennis J. US Army Mater & Mech Res Cent, Watertown, Mass American Ceramic Society Bulletin v 56 n 4 Apr 1977 p 412-415 CODEN: ACSBA7 ISSN: 0002-7812 Lang.: Eng. Failure by arcing of alumina-to-copper sealed electron tubes with active metal brazes was traced to increased tube gas released into the tube envelope by the intersection of propagating end cracks with pores in the alumina. End cracks were caused by reaction of the braze with the alumina and by the thermal expansion mismatch between the two. End cracks were almost totally eliminated with the use of metallized ceramics in sintered powder metal seals. 15 refs. Desc.: *ELECTRON TUBES, MICROWAVE--*Reliability Class. Codes: 714 (Electronic Components) 71 (ELECTRONICS & COMMUNICATIONS) Y029008 138 0665462 E.I. Monthly No: EI7711079202 E.I. Yearly No: EI77004823 800 MHz 10 WATT MIC POWER AMPLIFIER. Maki, Tomokazu; Noda, Yhji NEC, Tokyo, Jpn NEC Research & Development n 44 Jan 1977 p 49-56 CODEN: NECRAU ISSN: 0547-051X Lang.: ENGLISH A wideband, high gain, high output MIC (microwave integrated circuit) power amplifier for ?800 MHz band mobile service has been developed. The amplifier is composed of a thin-film circuit, uses an alumina ceramic substrate having EPSILON //r = 9. 5 dielectric constant and is compact in construction due to wavelength contraction. Transistors used for the MIC power amplifier have attained sufficient ruggedness due to the use of an emitter ballasting resistor and design consideration against destruction of the electric field mode. High reliability is provided by the use of a i-Pt-Au metallization system and thermal design, whereby the junction temperature is controlled to below 135 DEGREE C. The amplifier provides an output power of 12. 0 watts and a power gain of 21 db at an input voltage of 12. 0 volts over a frequency band of 110 MHz. The outside dimensions of the MIC power amplifier are 60 mm X 30 mm X 16 mm. 6 refs. Desc.: *AMPLIFIERS, POWER TYPE; AMPLIFIERS, MICROWAVE; INTEGRATED CIRCUITS Class. Codes: 713 (Electronic Circuits) 71 (ELECTRONICS & COMMUNICATIONS) Y029008 139 0649848 E.I. Monthly No: EI7709066662 E.I. Yearly No: EI77049025 CONFERENCE ON ADVANCES IN MAGNETIC MATERIALS AND THEIR APPLICATIONS, 2ND, 1976. Anon IEE, Sci, Educ, and Manage Div, London, Engl IEE Conference Publication n 142, Conf on Adv in Magn Maier and their Appl, 2nd, London, Engl, Sep 1-3 1976. Publ by IEE, London, Engl, 1976 172 p CODEN: IECPB4 Lang.: Eng. Forty two papers by various authors are presented. The topics discussed are: Epitaxial growth of ferrite, magnetic Ni-Fe-Co films, new particles of solid solutions, ferromagnetic liquids, ferrite cores, microwave filter, grain-oriented silicon-iron, effects of pinning on domain wall motion, normal flux effects on power loss, losses due to transverse fluxes, surface impedance of iron, flexible bonding effects on domain structure, magnetostriction effect on Young's modulus, Co-Fe soft magnetic alloys, toroidal cores, Ni-Fe alloys for current transformers, high gradient magnetic separation, high intensity magnetic separation, magnetic susceptibility and viscosity, mineral slurries separation by cryogenic magnet, asbestos fibers separation, vehicles using DC and permanent magnets, magnetically suspended vehicles, electromagnetic levitation, switching power supply vehicles, electromagnetic levitation, switching power supply using ferrite transformers, levitation with superconducting magnets, linear superconducting motors, induction machines, satellite stabilization, permanent magnets, and barium hexoferrite magnets sintering. Individual papers are indexed separately. Desc.: *MAGNETIC MATERIALS--*Applications Class. Codes: 708 (Electric & Magnetic Materials) 70 (ELECTRICAL ENGINEERING) Y029008 140 0645662 E.I. Monthly No: EI7708054913 E.I. Yearly No: EI77011633 CERAMICS OF GOOD THERMAL STRENGTH FROM FUSED POWDERS OF YTTRIUM AND SCANDIUM OXIDES. Fekhretdinov, F. A.; Molchanov, M. S.; Aleksandrov, V. I.; Osikov, V. V. Tatarintsev, V. M. Refractories (English translation of Ogneupory) v 17 n 5-6 May-Jun 1976 p 320-22 CODEN: REFRAL ISSN: 0034-3102 Lang.: Eng. Ceramic processed from the oxides of yttrium and scandium possesses good electrophysical and anticorrosion properties and is therefore a useful material for electric insulators in high-temperature equipment, more particularly in plasma equipment. However, the low thermal strength of these oxides limits their use for this purpose. An investigation was carried out of the conditions for producing refractories from electrofused Y//2O//3 by casting. Components of intricate shape were produced at a firing shrinkage of about 6%. Conditions were refined for producing refractories with good thermal strength from powders of Y//2O//3 and Sc//2O//3 by semidry molding. 4 refs. Desc.: *CERAMIC MATERIALS--*Thermal Properties; YTTRIUM COMPOUNDS-- Thermal Properties; SCANDIUM AND ALLOYS--Thermal Properties; ELECTRIC INSULATING MATERIALS--Ceramic; PLASMA DEVICES Class. Codes: 812 (Ceramics & Refractories); 804 (Chemical Products); 547 (Precious & Rare Earth Metals & Alloys); 413 (Insulating Materials); 932 (High Energy, Nuclear & Plasma Physics) 81 (CHEMICAL PROCESS INDUSTRIES); 80 (CHEMICAL ENGINEERING); 54 (METAL GROUPS); 41 (CONSTRUCTION MATERIALS); 93 (ENGINEERING PHYSICS) Y029008 141 0639957 E.I. Monthly No: EI7707051946 E.I. Yearly No: EI77071073 HIGH TEMPERATURE MICROWAVE HEATING IN REFRACTORY MATERIALS. Berteaud, A. J.; Badot, J. C. CNRS, Thiais, Fr Journal of Microwave Power v 11 n 4 Dec 1976 p 316-320 CODEN: JLMPAB ISSN: 0022-2739 Lang.: Eng. Microwave energy can be used to create high temperatures ( < 1700 DEGREE C for alumina) in refractory materials. Energy conversion takes place with a very good efficiency (90% in the conversion process of microwaves to thermal energy) if an appropriate applicator is utilized. Experiments at 2. 45 GHz involving either the sintering of alumina or melting of silica for fiber fabrication are described which confirm the feasibility of this new process. Desc.: *REFRACTORY MATERIALS--*Dielectric Properties; ELECTRIC HEATING, DIELECTRIC--Microwaves Class. Codes: 812 (Ceramics & Refractories); ?42 (Industrial Furnaces & Process Heating) 81 (CHEMICAL PROCESS INDUSTRIES); 64 (HEAT & THERMODYNAMICS) Y029008 142 0633767 E.I. Monthly No: EI7706037712 E.I. Yearly No: EI77007715 PROPERTIES OF BIRD FEATHERS AS CONVERSE PIEZOELECTRIC TRANSDUCERS AND AS RECEPTORS OF MICROWAVE RADIATION -- 1. BIRD FEATHERS AS CONVERSE PIEZOELECTRIC TRANSDUCERS. Bigu-Del-Blanco, J.; Romero-Sierra, C. Queen's Univ, Kingston, Ont Biotelemetry v 2 n 6 1976 p 341-364 CODEN: BTMYA6 ISSN: 0301-5912 Lang.: Eng. An investigation was made of the properties of bird feathers as piezoelectric transducers in the audiofrequency range and as dielectric receptors of electromagnetic radiation in the microwave region. In the first case, cartridges of the ceramic and magnetic type and an electromagnetic transducer probe were used as detecting devices. Results show piezoelectric resonances in the 1 to 20-kHz region for the calami of feathers. 35 refs. Desc.: *BIOLOGICAL MATERIALS--*Electronic Properties; PIEZOELECTRIC TRANSDUCERS; ANTENNAS, DIRECTIVE--Microwave; ANTENNAS, DIPOLE--Microwave Ident.: BIRD FEATHERS Class. Codes: 461 (Biotechnology); 701 (Electricity & Magnetism); 708 (Electric & Magnetic Materials); 716 (Radar, Radio & TV Electronic Equipment) 46 (BIOENGINEERING); 70 (ELECTRICAL ENGINEERING); 71 (ELECTRONICS & COMMUNICATIONS) Y029008 143 0629522 E.I. Monthly No: EI7706041701 E.I. Yearly No: EI77053378 REPRODUCIBLE METHODS FOR THE FABRICATION OF MICROWAVE STRIP LINES OF HIGH PRECISION AND RELIABILITY. Brauer, W.; Kienel, G.; Wechsung, R. Leybold Hereaus & Co, Koeln, Ger Solid State Technology v 19 n 12 Dec 1976 p 67-73 CODEN: SSTEAP ISSN: 0038-111X Lang.: Eng. Improvements in fabrication techniques of microstrip circuits for the 10 GHz range are described. Ceramic, sapphire and quartz were investigated as substrate materials and new measuring methods were developed for the determination of the dielectric constant, using the circular resonator, the rectangular resonator and the capacitance measurement methods. For producing the chromium gold metallization, the cathode sputtering technique was optimized in such a way that the gold layers had an extremely high adhesive strength and an electrical conductivity which was only 10% lower than that of the bulk material. Circuit delineation was produced by means of ion etching. Microwave test circuits are described by means of which the fabrication parameters and their variations can be exactly related to the parameters of the finished microstrips. 13 refs. Desc.: *MICROSTRIP DEVICES Class. Codes: 714 (Electronic Components) 71 (ELECTRONICS & COMMUNICATIONS) Y029008 144 0595557 E.I. Monthly No: EI7701006540 E.I. Yearly No: EI77085976 PROPERTIES OF BIRD FEATHERS AS PIEZOELECTRIC TRANSDUCERS AND AS RECEPTORS OF MICROWAVE RADIATION. Bigu del Banco, J.; Romero-Sierra, C. Queen's Univ, Kingston, Ont Colloq Int sur les Capteurs Bio-Med (Biocapt 75) Int Conf on Biomed Transducers, Paris, Fr, Nov ?-7 1975 Publ by Com d'Organ du Colloq de Paris, Fr, 1975 v 1 p 127-132 Lang.: Eng. An investigation was made of the properties of bird feathers as piezoelectric transducers in the audiofrequency range and as dielectric receptors of electromagnetic radiation in the microwave region. In the first case, cartridges of the ceramic and magnetic type and an electromagnetic transducer probe were used as detecting devices. Results show piezoelectric resonances in the 1-20 kHz region for the calami (quills) of feathers. The characteristics of bird feathers, as receptors of microwave fields, were studied in the 10-16 GHz region. Experiments were conducted coupling the specimen (feather) to a length of waveguide which served, together with other microwave components as a primary detector. Microwave power radiation patterns were measured both in the presence and in the absence of the specimen. Results indicated a substantial increase in the microwave power collected in the forward direction, and a decrease of the radiation pattern beam-width when the feather was present. Furthermore, some experimental evidence indicated the possibility of inducing piezoelectric effects in the specimen by audiofrequency pulse-modulated microwave fields. These results are important in view of: (i) the fundamental role that feathers play in the life of birds, and (ii) the influence of environmental factors on bird behavior. 21 refs. Desc.: *SYSTEMS SCIENCE AND CYBERNETICS--*Bionics; PIEZOELECTRIC TRANSDUCERS; RADIO RECEIVERS--Microwave Frequencies Ident.: BIRD FEATHERS; BIOLOGICAL TRANSDUCERS Class. Codes: 461 (Biotechnology); 704 (Electric Components & Equipment); 716 (Radar, Radio & TV Electronic Equipment) 46 (BIOENGINEERING); 70 (ELECTRICAL ENGINEERING); 71 (ELECTRONICS & COMMUNICATIONS) Y029008 145 0594821 E.I. Monthly No: EI7701000922 E.I. Yearly No: EI7701392 CAPACITORS FOR MICROWAVE APPLICATIONS. Veloric, Harold S.; Mitchell, Joseph Jr.; Theriault, Gerald E.; Carr, Lester A. Jr. RCA Lab, Princeton, NJ IEEE Transactions on Parts, Hybrids and Packaging v PHP-12 n 2 Jun 1976 83-89 CODEN: IEPHAA ISSN: 0099-4634 Lang.: Eng. The properties and design of a metal oxide-metal (MOM) capacitor are reviewed and its performance is compared with that of conventional MOS and metalized ceramic capacitors. The MOM structure is fabricated by growing a high-performance dielectric such as SiO//2 or Si//3N//4 on silicon and metalizing the dielectric with several mils of copper, after which the silicon " handle " is removed and replaced with copper. The MOM capacitor has the high capacitance density, low dielectric loss, and low temperature coefficient properties of thermally grown dielectrics. In addition, the resistive electrode loss is minimized by the replacement of the lossy silicon with copper. The electrode loss for the MOS and MOM capacitors is evaluated as a function of frequency and is in good agreement with the loss estimated from the surface sheet resistance. The series resistance of an MOM capacitor is only 10 percent of that measured for a comparable MOS structure. MOM capacitors have been successfully soldered into circuits; these assemblies have been temperature cycled and high temperature stressed. 11 refs. Desc.: *CAPACITORS; MICROWAVE DEVICES Class. Codes: 714 (Electronic Components) 71 (ELECTRONICS & COMMUNICATIONS) Y029008 146 0592929 E.I. Monthly No: EI7701001020 E.I. Yearly No: EI7701104 MICROWAVE-ABSORBING FERRITE-DIELECTRIC COMPOSITES. Maguire, E. A.; Readey, D. W. Raytheon Res Div, Waltham, Mass Journal of the American Ceramic Society v 59 n 9-10 Sep-Oct 1976 p 434-437 CODEN: JACTAW ISSN: 00?2-7820 Lang.: Eng. Two-phase composites of spinel ferrites and lithium aluminosilicates were prepared and investigated as microwave-absorbing materials. The magnetic and dielectric loss parameters which determine the heating characteristics were examined. Low-thermal-expansion composites were developed which were effective absorbers of microwave radiation. 3 refs. Desc.: *CERAMIC MATERIALS--*Ferroelectric Ident.: SPINELS Class. Codes: 812 (Ceramics & Refractories) 81 (CHEMICAL PROCESS INDUSTRIES) Y029008 147 0587673 E.I. Monthly No: EI7612083672 E.I. Yearly No: EI76060113 LIGHT MACHINING OF SINTERED IRON COMPACT. Sugita, Tadaaki; Tanaka, Miyoshi Journal of the Japan Society of Powder and Powder Metallurgy v 23 n 5 Aug 1976 p 178-183 CODEN: FOUA2 ISSN: 0532-8799 Lang.: JAPANESE The machining performances of three types of cutting tools in light machining of the sintered iron compacts, which are sintered alumina containing titanium carbide, cemented carbide and cermet, are discussed. Also, the performance of each tool was evaluated in the continuous cutting condition by turning and in the intermittent cutting condition by face milling. The experimental results indicate that the sintered alumina containing titanium carbide is superior to the other tools from the viewpoint of tool life. 14 refs. In Japanese. Desc.: *POWDER METAL PRODUCTS--*Machining; POWDER METALLURGY--Iron CUTTING TOOLS Class. Codes: 536 (Powder Metallurgy); 545 (Iron & Steel); 603 (Machine Tools); 605 (Small Tools & Hardware) 53 (METALLURGICAL ENGINEERING); 54 (METAL GROUPS); 60 (MECHANICAL ENGINEERING) Y029008 148 058196 E.I. Monthly No: EI7612082080 E.I. Yearly No: EI76044086 EVALUATION OF A RANDOM SIGNAL CORRELATION SYSTEM FOR ULTRASONIC FLAW DETECTION. Bilgutay, Nihat M.; Furgason, Eric S.; Newhouse, Vernon L. Purdue Univ, West Lafayette, Indiana IEEE Transactions on Sonics and Ultransonics v SU-23 n 5 Sep 1976 p 329-333 CODEN: IESUAU ISSN: 0018-9537 Lang.: Eng. A random signal flaw detection system has been developed with signal-to-noise ratio enhancement approximately 10 000 times greater than conventional ultrasonic pulse-echo systems. Experimental results are presented which demonstrate that the system can penetrate highly absorbent materials such as plexiglass, high-density silicon nitride and alumina at greater distances than is possible with conventional pulse-echo systems. The system is shown to detect echoes from grain boundaries which indicate that the system could have applications in microstructure evaluation of materials. Finally, the possible application of this system to accurate sound velocity measurement in strongly absorbing materials is discussed. 7 refs. Desc.: *MATERIALS TESTING--*Nondestructive Testing; ULTRASONIC APPLICATIONS Class. Codes: 423 (General Materials Properties & Testing); 753 (Sound Technology & Ultrasonics) 42 (MATERIALS PROPERTIES & TESTING); 75 (ACOUSTICAL TECHNOLOGY) Y029008 149 0572041 E.I. Monthly No: EI7610069707 E.I. Yearly No: EI76063544 SIALON DERIVED FROM CLAY TO PROVIDE AN ECONOMICAL REFRACTORY MATERIAL. Lee, J. G.; Casarini, R.; Cutler, Ivan B. Univ of Utah, Salt Lake City Industrial Heating v 43 n 4 Apr 1976 p 50-53 CODEN: INHTAZ ISSN: 0019-8374 Lang.: Eng. Sialon is a solid solution of silicon nitride and aluminum oxide that can be cold pressed and sintered. Its name is an acronym of the elements in the solid solution. The usual method of obtaining Sialon is by sintering a mixture of silicon nitride (obtained from silicon) and alumina at 1700 DEGREE C. This article describes an easier and inexpensive route to production of sintered Sialon, by using clay and carbon (which can be coal) as the raw materials. Ball clays, kaolins and halloysite have been used with equal success. Sialon made from clay can withstand 1800 DEGREE C for short periods of time in an oxidizing temperature without melting. Desc.: *REFRACTORY MATERIALS; CLAY PRODUCTS; SILICON COMPOUNDS Ident.: SIALON Class. Codes: 812 (Ceramics & Refractories); 804 (Chemical Products) 81 (CHEMICAL PROCESS INDUSTRIES); 80 (CHEMICAL ENGINEERING) Y029008 150 0570129 E.I. Monthly No: EI761006504 E.I. Yearly No: EI76009704 ABRASIVE MACHINING OF CERAMICS. Turker, Emin G.; Stanislao, Joseph Cleveland State Univ, Ohio Society of Manufacturing Engineers, Technical Papers n MR75-612 for Meet, Hartford, Conn, Sep 24-25 1975, 13 p CODEN: SMEPBA Lang.: Eng. The abrasive system under investigation was composed of various grades of polycrystalline alumina, single crystal alumina, and hot pressed silicon nitride machined with resin bonded diamond wheels. Effect of liquids on the abrasive machining of ceramics were also studied in detail. It is found that material removal efficiency and power consumption are closely related to workpiece history as well as wetting characteristics and mode of applications of liquids. Surface quality of finished product is discussed and related to machining parameter and to liquids. Desc.: *CERAMIC MATERIALS--*Machining; GRINDING Ident.: ABRASIVE MACHINING Class. Codes: 812 (Ceramics & Refractories); 604 (Metal Cutting & Machining) 81 CHEMICAL PROCESS INDUSTRIES); 60 (MECHANICAL ENGINEERING)