Method for curing of green polysilazane-based silicon carbide precursor fibers

摘要

Disclosed herein are methods of curing silicon carbide precursor polymer fibers, such as polysilazanes, using moisture and free radical generators, such as peroxides. Also disclosed are methods of forming, curing, and using silicon carbide precursor polymers that contain alkenyl groups and free radical generators, such as peroxides.

主权项

1. A method of curing a polysilazane fiber comprising:
a) forming a polysilazane fiber by:
i. reacting at least one methylchlorodisilane; at least one organochlorosilane comprising at least one alkenyl group; and at least one nitrogen-containing additive to form a resin;ii. combining the resin with at least one free-radical generator and optionally at least one inhibitor to form a resin mixture; andiii. spinning said resin mixture to form said polysilazane fiber, wherein said spinning is performed at a temperature below the 1 hr, half-life temperature of the free radical generator; b) exposing said polysilazane fiber to moisture; and c) curing said polysilazane fiber by exposing said polysilazane fiber to a temperature above the 1 hr half-life temperature of the free radical generator but below the softening point temperature of the moisture-exposed polysilazane fiber.