Accession Number : ADP007751

Title :   Microwave Synthesis of Metal Carbides,

Corporate Author : CALIFORNIA UNIV LOS ANGELES DEPT OF MATERIALS SCIENCE AND ENGINEERING

Personal Author(s) : Kozuka, Hiromitsu ; Mackenzie, John D.

Report Date : 27 APR 1992

Pagination or Media Count : 8

Abstract : Microwave heating of metal oxide/ graphite or glassy carbon powder mixtures was carried out in Ar, utilizing a commercial microwave oven operated at 2.45 GHz and 700 W. Temperatures of up to 1400 - 1500 deg C could be obtained within 13 min, and Silicon carbide, Titanium carbide, Niobium carbide and Tantalum carbide were formed within 20 min. This method was also shown to offer a new process for producing SiC whiskers. Not only the amount of carbon but also the compactness of the starting powders was found to be essential for heating efficiency.

Descriptors :   *METALS, *MICROWAVES, *CARBIDES, *CERAMIC MATERIALS, CARBON, EFFICIENCY, GLASSY CARBON, GRAPHITE, HEATING, MICROWAVE OVENS, MIXTURES, OVENS, OXIDES, POWDERS, TEMPERATURE, ARGON, POWDER ALLOYS, SILICON CARBIDES, WHISKERS(CRYSTALS), RADIATION ABSORPTION, COMPOSITE MATERIALS, FIRING(CERAMICS), DIFFRACTION, SYMPOSIA.

Subject Categories : Ceramics, Refractories and Glass
      Laminates and Composite Materials
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE