Continuous inorganic fibers and process for production thereof

Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Rod – strand – filament or fiber

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428379, D02G 300

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active

046632298

ABSTRACT:
Continuous inorganic fibers consisting substantially of Si, Zr and C and optionally of O, said fibers being composed of (1) an amorphous material consisting substantially of Si, Zr and C and optionally of O, or (2) an aggregate consisting substantially of ultrafine crystalline particles of .beta.-SiC, ZrC, a solid solution of .beta.-SiC and ZrC and ZrC.sub.1-x wherein O<x<1 and having a particle diameter of not more than 500 .ANG., in which amorphous SiO.sub.2 and ZrO.sub.2 sometimes exist in the neighborhood of these ultrafine crystalline particles, or (3) a mixture of said amorphous material (1) and said aggregate (2) of ultrafine crystalline particles. The aforesaid continuous inorganic fibers can be produced by the following steps: a first step of preparing a semi-inorganic block copolymer comprising polycarbosilane blocks having a main chain skeleton composed mainly of carbosilane units of the formula --Si--CH.sub.2 --, each silicon atom of said carbosilane units having bonded thereto a side-chain group selected from the class consisting of hydrogen, lower alkyl and phenyl, and zirconoxane units of the formula --Sr-O--; a second step of preparing a spinning dope of said semi-inorganic block copolymer and spinning the dope; a third step of subjecting the resulting fibers to a treatment of rendering them infusible under tension or under no tension; and a fourth step of firing the infusible fibers at a temperature of 800.degree. to 1800.degree. C. in a vacuum or in an atmosphere of an inert gas or a reducing gas.

REFERENCES:
patent: 4100233 (1978-07-01), Yajima et al.
patent: 4283376 (1981-08-01), Yajima et al.
patent: 4342712 (1982-08-01), Yajima et al.
patent: 4347347 (1982-08-01), Yajima et al.
patent: 4359559 (1982-11-01), Yajima et al.

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