Process for the production of long fibrous silicon carbide whisk

Details Process for the production of long fibrous silicon carbide whisk Process for the production of long fibrous silicon carbide whisk

1995-02-17

1997-03-25

Langel, Wayne

Chemistry of inorganic compounds

Silicon or compound thereof

Binary compound

423345, 427227, 4272552, C01B 3136

Patent

active

056141629

ABSTRACT:
The production of SiC whiskers and of mats thereof on a substrate by treatment, at 1250.degree. to 1500.degree. C., of a gaseous mixture including hydrogen and sources of Si and C atoms which are in the form of at least one oxygen-free compound, in the presence of a metal type catalyst, by a semi-continuous or periodic process, is characterized in that, during the growth period, an Al-Fe catalyst is introduced into the gas phase in the reaction zone, by means of carbon reduction of aluminosilicate ceramics, which comprise at least 73 weight % of Al.sub.2 O.sub.3 and 0.3 to 3.0 weight % of iron oxides and the substrate is a carbonized rayon fiber based carbon fabric which has been pre-treated, prior to carbonization, with a solution of borax and a solution of diammonium phosphate until the quantities of boron and phosphorus in the fabric do not amount to more than 4 and 2 weight %, respectively.

REFERENCES:
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patent: 4284612 (1981-08-01), Horne, Jr. et al.
patent: 4504453 (1985-03-01), Tanaka et al.
patent: 4789536 (1988-12-01), Schramm et al.
patent: 4789537 (1988-12-01), Shalek et al.
patent: 4849196 (1989-07-01), Yamada et al.
patent: 5404836 (1995-04-01), Milewski

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