Process for producing a boron-containing silicon carbide powder

Details Process for producing a boron-containing silicon carbide powder Process for producing a boron-containing silicon carbide powder

1987-01-27

1989-07-11

Lechert, Jr., Stephen J.

Chemistry of inorganic compounds

Silicon or compound thereof

Binary compound

501 88, C01B 3136

Patent

active

048470600

ABSTRACT:
Silicon carbide particles are produced by reacting a gaseous silicon compound or granular silicon with a carbon compound at a high temperature. In the reaction, the amount of free carbon content in the resultant silicon carbide particles can be controlled by monitoring the amount of unsaturated hydrocarbon such as acetylene, as a by-product. Moreover, silicon carbide particles can contain boron dispersed uniformly in the particles by a two step process comprising first reacting a silicon source and a boron source without a carbon source in a first reaction zone, to form boron-containing silicon particles, and second, reacting the resultant particles with a carbon source in a second reaction zone. Further, the above-mentioned monitoring of an unsaturated hydrocarbon by-product allows the obtaining of silicon carbide particles containing no free carbon, and the silicon carbide particles containing boron in the particles but no free carbon may be sintered without the addition of free carbon, to give a dense sinter.

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Japanese Journal of Applied Physics, vol. 19, No. 11, pp. L693-694, Nov. 1980, "Preparation of Ultrafine Powder by Modified Gas-Evaporation".

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