phase evolution in ultra-fine TiC_(0.7)N_(0.3)-based cermet during sintering

摘要

Ultra-fine TiC_(0.7)N_(0.3)-based cermet is prepared and the phase evolution and microstructure are studied by XRD and SEM. The results show that in ultra-fine cermet, solid state reactions take place more readily than in common cermets at 900 deg C; liquid phase forms at aboul 1230 deg C in ultra-fine cermets, which is at a lower temperature than what has been reported; denitridation occurs during sintering of both cermets in vacuum, and they had better be sintered in N_2 to preserve the C/N atomic ratio of TiC_(0.7)N_(0.3).