▎ 摘　　要

NOVELTY - Silicon carbide polymer precursor ceramic defect healing method comprises e.g. (i) dissolving polycarbosilane powder, vinyltriethoxysilane and certain amount of Custer catalyst in xylene to obtain xylene solution, and dispersing graphene oxide powder in purified water to obtain aqueous solution, mixing the xylene solution and the aqueous solution, heating the mixed liquid in water bath, stirring with a magnetic stirrer, allowing to stand the reaction solution, taking out upper layer liquid by rotary evaporation, and grinding to obtain precursor poly(N-vinylguanidine) powder, and compression molding to obtain silicon carbide-reduced graphene oxide blank body, sintering silicon carbide-reduced graphene oxide blank body at high temperature under an argon atmosphere in an atmospheric tube furnace, and cooling, (ii) immersing in liquid polycarbosilane precursor, and (iii) oxidizing at high temperature in the air at different temperatures to obtain final product. USE - The method is useful for silicon carbide polymer precursor ceramic defect healing method. DETAILED DESCRIPTION - Silicon carbide polymer precursor ceramic defect healing method comprises (i) dissolving polycarbosilane powder, vinyltriethoxysilane and certain amount of Custer catalyst in xylene to obtain xylene solution, and dispersing graphene oxide powder in purified water to obtain aqueous solution, mixing the xylene solution and the aqueous solution, heating the mixed liquid in water bath, stirring with a magnetic stirrer, allowing to stand the reaction solution, taking out upper layer liquid by rotary evaporation, and grinding to obtain precursor poly(N-vinylguanidine) powder, and compression molding to obtain silicon carbide-reduced graphene oxide blank body, sintering silicon carbide-reduced graphene oxide blank body at high temperature under an argon atmosphere in an atmospheric tube furnace, and cooling to obtain black three-dimensional silicon carbide-reduced graphene oxide ceramic, (ii) immersing the above obtained ceramic in liquid polycarbosilane precursor having small molecular weight, taking out, drying, and cracking at high temperature in argon atmosphere, and repeating the immersing step many times to obtain impregnated three-dimensional silicon carbide-reduced graphene oxide ceramic, and (iii) oxidizing impregnated three-dimensional silicon carbide-reduced graphene oxide ceramic at high temperature in the air at different temperatures to obtain final product.