超细Ti(C,N)基金属陶瓷的微波烧结工艺研究

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

采用微波烧结技术制备了超细Ti(C,N)基金属陶瓷材料,考察了烧结温度和保温时间对超细Ti(C,N)基金属陶瓷材料力学性能的影响,并利用扫描电镜(SEM)观察了断口形貌和显微组织。结果表明:金属陶瓷组织存在黑芯-灰壳和白芯-灰壳两种结构,烧结温度过高,保温时间过长,晶粒均明显长大,导致材料力学性能下降。1 500℃下保温30 min,可获得晶粒细小、组织均匀、性能优异的超细Ti(C,N)基金属陶瓷。

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.