Amorphous silicon oxycarbide and crystalline silicon carbide fibers from curable alkenyl or alkynyl functional siloxane resins

摘要

The present invention claims herein a method for preparing a ceramic fiber from alkenyl or alkynyl functional resins and the ceramic fibers produced therefrom. The method comprises (A) forming a fiber from a siloxane resin comprised of R<1>aR<2>bRSiO(3-a-b)/2 units wherein R is an unsaturated carbon group; each R<1> is selected from an aryl group having from 6 to 10 carbon atoms or the functional derivatives thereof; each R<2> is selected from an alkyl group having from 1 to 4 carbon atoms or the functional derivatives thereof; a has a value of 0, 1 or 2; b has a value of 0, 1 or 2 with the proviso that a+b ≤ 2; (B) curing the fiber by exposing the fiber to high energy radiation to render it non-fusible; and (C) heating the non-fusible fiber in an inert environment to a temperature above 800 DEG C. to convert it to a ceramic fiber.