中文摘要：

本文研究了添加不同比例的TaC、NbC对Ti（C，N）-NiMo系金属陶瓷的力学性能的影响及在750℃空气中的氧化行为，测定并计算了恒温氧化增重与时间的函数关系及氧化速率常数。结果表明，这类陶瓷材料的氧化为“钝性氧化”，TaC／NbC质量比为4：3时，显示出较好的力学性能和抗氧化性。通过X射线衍射（XRD）、扫描电镜（SEM）、能谱分析（EDS）等手段，分析了氧化膜的组成与结构，探讨了Ti（C，N）基金属陶瓷高温下的氧化机制。

英文摘要：

In this paper, the effect of the different ratio of TaC to NbC on Ti（C,N）- NiMo cermets mechanical property and the oxidation of Ti （C,N）-based cermets at 750℃ in air was studied. The function relations of isothermal weight gains vs oxidation time were deter- mined and oxidation rate was calculated. The results show that the oxidation kinetics of the Ti （C, N）-based cermets obey the typical parabolic rule. The material exhibits good oxidation resistance and mechanical properties. The structure of oxidation fdms was analyzed by means of X-ray diffraction （XRD） and scanning electron microscope （SEM）. The mechanism of oxidation resistance of Ti（C, N）-based cermets was discussed.