Super heat-resistant silicon carbide fibers from poly-carbosilan

Details Super heat-resistant silicon carbide fibers from poly-carbosilan Super heat-resistant silicon carbide fibers from poly-carbosilan

1991-11-25

1994-02-01

Chaudhuri, Olik

Chemistry of inorganic compounds

Silicon or compound thereof

Binary compound

501 88, 501 95, 264 22, 264 66, C04B 3556

Patent

active

052830446

ABSTRACT:
A super heat-resistant silicon carbide fiber has an oxygen content of less than 0.1% by weight. In a process for producing the super heat-resistant silicon carbide fiber, a precursor fiber prepared by spinning a polycarbosilane having an oxygen content of less than 0.8% by weight is irradiated with a radiation in an oxygen-free atmosphere or in vacuo to make the precursor fiber infusible. The infusibilized fiber is fired in an oxygen-free atmosphere or in vacuo at a temperature of from 1000.degree. to 2200.degree. C. without exposure to an oxidizing atmosphere; or stabilized in the same atmosphere at a temperature of from 300.degree. to 600.degree. C. without exposure to an oxidizing atmosphere and fired in an oxygen-free atmosphere or in vacuo at a temperature of from 1000.degree. to 2200.degree. C.

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