双芯环结构Ti(C,N)基金属陶瓷材料的制备与性能研究

Study on the preparation and properties of Ti(C,N)-based cermet with double-core ring structure

采用固相化学反应与碳热还原氮化相结合的方法,将W、Mo、Ta等重金属元素与(C,N)复合,制备得到(W,Mo,Ta)(C,N)粉末,并利用高能球磨机与Ti(C,N)基体进行混合,再经压制成型、低压烧结制备出具有双芯环结构的Ti(C,N)基金属陶瓷。利用X射线衍射仪、扫描电子显微镜分析双芯环结构对Ti(C,N)基金属陶瓷微观形貌和力学性能的影响。结果表明,在高温烧结过程中,通过Ostwald溶解–析出机制所形成的双芯环结构可以阻止裂纹扩展,达到增韧效果;结果说明,可通过优化Ti(C,N)基金属陶瓷材料的芯环结构,达到增加金属陶瓷材料韧性的目的。

The solid phase chemical reaction and the carbothermal reduction-nitridation method were combined to prepare the(W,Mo,Ta)(C,N)powders,using the heavy metal elements as W,Mo,and Ta.The(W,Mo,Ta)(C,N)powders and Ti(C,N)-based ceramic powders were mixed by high-energy ball milling.Then,the Ti(C,N)-based cermet with a double-core ring structure was obtained by pressing formation and low pressure sintering.The effect of double-core ring structure on the microstructures and mechanical properties of Ti(C,N)-based cermet was investigated by X-ray diffraction and scanning electron microscopy.The results show that,the double-core ring structure formed by the Ostwald dissolution-precipitation mechanism during the high-temperature sintering process can prevent cracks from extending,which leads to the excellent toughness performance.The toughness of Ti(C,N)-based cermet can be improved by optimizing the core ring structure of the cermet material.