Production of SiC-based composite material for SiC reinforcing fibers

摘要

PROBLEM TO BE SOLVED: To obtain an SiC reinforcing fiber for a composite material, having excellent heat resistance, toughness and strength by preparing a polymer blend obtained by adding a polymethylsilane.;SOLUTION: A melt obtained by adding the polymethylsilane to an organic solvent dissolving a polycarbosilane is prepared, and the resultant melt is heated and melted to progress a partial cross-linking and to provide a mixed polymer melt having 5-20 Pa.sec viscosity. The obtained mixed polymer melt is spun within a temperature range of 250-350°C to provide a fiber. The obtained fiber is heated in an oxidation atmosphere at 100-200°C to carry out the treatment for making the fiber infusible by oxidation, and the treated infusible fiber is fired in an inert atmosphere at ≥1,000°C.;COPYRIGHT: (C)2003,JPO