| abstract |
Preceramic polymers which have particular utility in providing protective ceramic coatings on carbon/carbon composites, graphite, carbon fibers, and other normally oxidizable materials are prepared by reacting 0.25-20 parts by weight of a trialkyl-, trialkoxy-, or triaryloxyboroxine in which any alkyl or alkoxy groups contain 1-6 carbons with one part by weight of a polysilazane to form an organoborosilazane polymer. |