Continuous inorganic fibers and process for production thereof

Details Continuous inorganic fibers and process for production thereof Continuous inorganic fibers and process for production thereof

D - Textiles, Paper

01

F

18/576, 204/91.3

D01F 9/10 (2006.01) C04B 35/571 (2006.01) C04B 35/622 (2006.01) C08G 77/60 (2006.01)

Patent

CA 1167216

ABSTRACT OF THE DISCLOSURE Continuous inorganic fibers consisting substantially of Si, Zr and C and optionally of 0, said fibers being com- posed of (1) an amorphous material consisting substantially of Si, Zr and C and optionally of 0, or (2) an aggregate consisting substantially of ultrafine crystalline particles of .beta.-SiC, ZrC, a solid solution of .beta.-SiC and Zr5 and ZrC1-x wherein 0 <x< 1 and having a particle diameter of not more than 500 .ANG., in which amorphous SiO2 and ZrO2 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 afore- said continuous inorganic fibers can he 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-CH2?, 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 ?Zr-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 to 1800°C in vacuum or in an atmosphere of an inert gas or a reducing gas.

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