YTTRIUM-CONTAINING COMPOSITE POWDER, COMPOSITE SINTERED BODY, AND METHOD OF MANUFACTURING SAME

摘要

An yttrium-containing composite powder for use as a material of a silicon nitride/silicon carbide composite sintered body is produced by thermally decomposing yttrium-con-taining polysilazane having an Si-N bond and an Si-C bond and an Si-O-Y bond and/or an N-O-Y bond in molecules thereof in an inert gas atmosphere or a vacuum at a temperature of at least 800.degree.C, and grinding the thermally decomposed yttriumcontaining polysilazane.