Abstract
Compacts of an equimolar mixture of Si and C powders were buried in an equimolar mixture of Ti and C powders, and was ignited by a tungsten heater with peassure of 1 GPa or without pressure. In the case of the processing without pressure, SiC powder with a mean particle size of 4μm was obtained by the SHS reaction which was assisted by the heat of the SHS reaction of Ti-C. The densely sintered SiC body with a relative density of 95% (maximum value) was obtained by the SHS processing with pressure. However, the reproducebility of the degree of densification was very poor. It was clarified by X-ray diffraction and high-resolution TEM observation that the SiC crystal prepared by this SHS processing was mainly composed of 3C polytype with containing a small amount of 6H, 2H and 4H polytypes as hosts.
