Method for producing SiC fiber-reinforced SiC composite material by means of hot press

摘要

A powdery mixture of fine SiC powder with one or more oxide sintering additives of Al₂O₃, Y₂O₃, SiO₂ and CaO is blended and uniformly dispersed in a polymeric SiC precursor to prepare a matrix-forming polymeric slurry. A preform of SiC fiber, which has quasi-stoichiometric composition with high crystallinity, is impregnated with the polymeric slurry and then hot-pressed at a temperature of 1600° C. or higher in presence of a liquid phase. Since the heat-resistant SiC fiber is used as strengthening fiber, the prepreg is sintered to a dense SiC composite excellent in mechanical properties by one-step hot-pressing.