(Ti,La)(C,N)-based solid solution cermets are fabricated from self-prepared (Ti,La)(C,N) carbonitrides by powder metallurgy with LaB₆ addition in the solid solution. Based on the results of XRD and SEM analyses, it is confirmed that there is complete dissolution of (Ti,La)(C,N) powder. The presence of La can effectively suppress grain overgrowth and thus enhance the homogeneity of porcelain microstructure, consequently increasing the particle size of black phase. On the basis of equal mass fraction of La, the performance of (Ti,La)(C,N)-based cermets is better than that of Ti(C,N)-La-based cermets prepared by simple addition of LaB₆ to Ti(C,N)-based cermet powder. The discrepancy can be directly related to the effect of adding LaB₆ in the solid solution. The physical and mechanical properties of (Ti,La)(C,N)-based cermets comes to optimum when the content of dissolved La is 0.25 wt%, and there is hardness elevation of 20%. With suitable La addition, there is decrease of oxygen content in the solid solution of cermets. It is hence deduced that LaB₆ can improve the performance of cermets as a deoxidizer.

（Ti，La）（C，N）基固溶金属陶瓷是通过粉末冶金和在固溶体中添加LaB _6的方法自制备的（Ti，La）（C，N）碳氮化物制成的。根据XRD和SEM分析的结果，可以确定（Ti，La）（C，N）粉末已完全溶解。La的存在可以有效地抑制晶粒的过度生长，从而增强了陶瓷微结构的均匀性，从而增加了黑相的粒径。在La的质量分数相等的基础上，（Ti，La）（C，N）基金属陶瓷的性能要好于通过简单地将LaB ₆加入到LaB _6中而制得的Ti（C，N）-La基金属陶瓷。Ti（C，N）基金属陶瓷粉末。差异可能与添加LaB ₆的效果直接相关在固溶体中。当溶解的La的含量为0.25wt％并且硬度提高20％时，（Ti，La）（C，N）基金属陶瓷的物理和机械性能达到最佳。通过添加适当的La，金属陶瓷固溶体中的氧含量会降低。因此推断出LaB ₆可以改善金属陶瓷作为脱氧剂的性能。