SIC fibers having low oxygen content and methods of preparation

Compositions: ceramic – Ceramic compositions – Carbide or oxycarbide containing

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C04B 3556

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active

052428702

ABSTRACT:
A method of preparing preceramic SiC fibers having a very low oxygen content by forming fibers from a solution of a polycarbosilane and a vinylic SiC precursor in a mutual volatile solvent, heating fibers in an oxygen-free inert atmosphere to effect a cross-linking reaction therebetween. Also disclosed is a method of preparing SiC fibers having superior high temperature properties and a very low oxygen content comprising heating the above-described cross-linked preceramic fibers in an inert atmosphere substantially free of oxygen for a time and at a temperature sufficient to pyrolyze the cross-linked fibers to SiC fibers. The disclosure also describes the novel fibers produced by the above-described methods.

REFERENCES:
patent: 4800221 (1989-01-01), Marko
patent: 4847345 (1989-07-01), Takamizawa et al.
"Synthesis of Continuous SiC Fibers with High Tensile Strength" Yajima et al. Journal of American Ceramic Society vol. 59 No. 7-8 pp. 324-327 (Aug. 1976).

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