Method of producing dense sintered silicon carbide body from polycarbosilane

摘要

A method of producing a dense sintered silicon carbide body, which is high in flexural strength, purity and strength at an elevated temperature, from polycarbosilanes is disclosed. This method comprises the following steps of: A. polymerizing organosilicon compounds to obtain insoluble and unmeltable polycarbosilane of which the melting or softening temperature lies higher than its thermal decomposition temperature; B. grinding this insoluble and unmeltable polycarbosilane to powder; C. decomposing this powder thermally in the range of 600 DEG to 2200 DEG C. in a nonoxidizing atmosphere to obtain silicon carbide; D. molding this silicon carbide powder; and E. sintering the thus molded body in a nonoxidizing atmosphere.