Study on Microwave Sintering Process of Ultra-fine Ti(C,N)-based Cermets

Ultra-fine Ti(C,N) matrix cermets were prepared by a microwave sintering technology.The effects of sintering temperature and holding time on the mechanical properties of the ultra-fine Ti(C,N) matrix cermets were studied.The fracture morphology and microstructure were investigated by scanning electron microscope(SEM).The results show that this cermet exhibits two kinds of microstructures of black core-grey rim and white core-grey rim.When the sintering temperature was too high or the holding time was too long,the grains obviously grew coarser,resulting in low mechanical properties.The ultra-fine Ti(C,N) matrix cermet sintered at 1500 ℃ for 30 minutes shows small grain,homogeneous microstructure and excellent properties.