Accession Number : AD0695388

Title :   PREPARATION OF B-MODIFICATION SILICON CARBIDE ALLOYED WITH VARIOUS IMPURITIES,

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Prokofeva,N. K. ; Reifman,M. B.

Report Date : 03 FEB 1969

Pagination or Media Count : 12

Abstract : The beta-modification of silicon carbide can be obtained by any of the following methods: (1) synthesis from silicon and carbon (graphite) at 1400-1500 degrees C, which yields beta-SiC in the form of a dark powder of non-stoichiometric composition; (2) crystallization from melts of silicon with certain metals, a process based on the substantial temperature variation of the solubility of silicon carbide in fused metals; beta-SiC is obtained in this case in the form of very small plates and needles; (3) thermal decomposition or reduction of compounds containing silicon and carbon on a surface heated to 1400-2200 degrees C. The report reviews, analyzes, and evaluates these preparation methods.

Descriptors :   (*SILICON CARBIDES, SYNTHESIS(CHEMISTRY)), GRAPHITE, SILANES, HALOGENATED HYDROCARBONS, IMPURITIES, ADDITIVES, CRYSTALLIZATION, THERMOCHEMISTRY, BORON, ALUMINUM, PHOSPHORUS, REDUCTION(CHEMISTRY), CHEMICAL PRECIPITATION, VAPORS, CHLORINE COMPOUNDS, SOLUBILITY, USSR

Subject Categories : Ceramics, Refractories and Glass
      Fabrication Metallurgy

Distribution Statement : APPROVED FOR PUBLIC RELEASE