| abstract |
A powdery mixture of fine SiC powder with one or more oxidensintering additives of Al 2 O 3 , Y 2 O 3 , SiO 2 and CaO is blended and uniformlyndispersed in a polymeric SiC precursor to prepare a matrix-forming polymericnslurry. A preform of SiC fiber, which has quasi-stoichiometric compositionnwith high crystallinity, is impregnated with the polymeric slurry and thennhot-pressed at a temperature of 1600°C or higher in presence of a liquidnphase. Since the heat-resistant SiC fiber is used as strengthening fiber, thenprepreg is sintered to a dense SiC composite excellent in mechanicalnproperties by one-step hot-pressing. |