Process for making silicon nitride whisker

Details Process for making silicon nitride whisker Process for making silicon nitride whisker

1989-10-11

1991-01-15

Straub, Gary P.

Chemistry of inorganic compounds

Silicon or compound thereof

Binary compound

C01B 21068

Patent

active

049852248

ABSTRACT:
Silica powder or a mixture of silica powder and silicon nitride whisker is heated at a temperature ranging from 800.degree. C. to 1,700.degree. C. in a gas mixture of ammonia gas (NH.sub.3) and hydrocarbon gas (C.sub.m H.sub.n) so as to produce silicon nitride whisker. The gas mixture flows at the rate of 10 mm/sec or less. The NH.sub.3 /CH.sub.4 ratio of the ammonia to the hydrocarbon, expressed as CH.sub.4, ranges from 0.5:1 to 2000:1 by volume. The silica powder is preferably mixed with at least one of six catalysts: transition metals; alkali metals; alkaline earth metals; halides of transition metals; halides of alkali metals; and alkaline earth metals. One mol part of the silica powder is mixed with 0.001-1.0 mol part of the catalyst.

REFERENCES:
patent: 3991166 (1976-11-01), Jack et al.
patent: 4280989 (1981-07-01), Seimiya et al.
patent: 4414190 (1983-11-01), Seimiya et al.
patent: 4594330 (1986-06-01), Suzuki et al.
patent: 4604273 (1986-08-01), Czupryna et al.

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