초록

A process for producing oxygen-free or low-oxygen shaped bodies of silicon carbide, particularly SiC fibers, by using chemically reactive polysilanes and/or polycarbosilanes as precursors. In accordance with the invention green fibers are stabilized preferably in the presence of reactive gases.

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A process for producing an oxygen-free or low-oxygen formed article of silicon carbide comprising the steps of: forming under inert conditions a material consisting essentially of a polymeric organo-silicon compound with chemically reactive centers comprising an unsaturated group adjacent a silicon

A process for producing an oxygen-free or low-oxygen formed article of silicon carbide comprising the steps of: forming under inert conditions a material consisting essentially of a polymeric organo-silicon compound with chemically reactive centers comprising an unsaturated group adjacent a silicon atom which carries a halogen atom into a formed article having a desired shape, said formed article consisting essentially of said organo-silicon compound with chemically reactive centers; stabilizing the shape of the formed article consisting essentially of said organo-silicon compound with chemically reactive centers by a treatment selected from the group consisting of a) reacting the polymeric organo-silicon compound with a gaseous cross-linking agent selected from the group consisting of ammonia, primary amines and hydrogen sulfide; and b) subjecting the polymeric organo-silicon compound to a thermal cross-linking treatment at a temperature below the softening temperature of the polymeric compound; and thereafter pyrolyzing the stabilized article at a temperature greater than 1000°C. in an inert atmosphere under anaerobic conditions.