Mo对Ti(C,N)基金属陶瓷包覆相结构与性能的影响

Influence of Molybdenum Content on the Structure and Characteristic of Rim Phase of Ti(C, N)-based Cermets

研究了不同Mo含量对高镍Ti(C,N)基金属陶瓷包覆相的组织结构与性能的影响。在Ti(C,N)基金属陶瓷中添加3%～15%不同含量的Mo,分别于1420℃、1430℃、1440℃温度下,进行真空烧结制备试样,通过扫描电镜观察组织结构与断口形貌,用三点弯曲法测试抗弯强度,用洛氏硬度计测得试样硬度。结果表明:当Mo含量为9%时材料的组织均匀,形成的包覆相厚度适中;在1430℃真空烧结时,比在1420℃及1440℃烧结时材料的力学性能好;当真空烧结温度为1430℃、Mo含量为9%时,试样的综合性能最好。

The influence of Mo content on the microstructure and mechanical properties of Ti （C, N）-based cermets with high Ni have been studied systematically. Different contents of Mo （3-15wt%） were added into Ti （C, N）-based cermets. Specimens were fabricated by conventional powder metallurgy and vacuum sintered at the temperature of 1420℃, 1430℃, and 1440℃ individually. The microstructure and fracture morphology were investigated by scanning electron microscope, and the mechanical properties such as transverse strength and hardness were measured. The results show that the microstructure is uniform and the thickness of rim phase is moderate when the content of Mo is 9 wt%; the mechanical properties of the specimens sintered at 1430℃ are better than those sintered at 1420℃and 1440℃. The integrated properties of transverse strength and hardness are the best when the content of Mo is 9 wt% and the sintering temperature is 1430℃.