中文摘要：

在试验的基础上系统研究了纳米级Al2O3的含量对Ti（C,N）基金属陶瓷力学性能和显微结构的影响。结果表明,纳米Al2O3的添加可大幅提高Ti（C,N）基金属陶瓷的力学性能,特别是硬度和断裂韧性明显提高,克服了Ti（C,N）基金属陶瓷硬度较低的缺点,扩大了其应用范围。通过对材料微观结构的观察和分析,认为纳米Al2O3的添加细化了基体晶粒,主要断裂模式为穿晶断裂,晶粒的细化和断裂模式的改变是材料力学性能提高的主要原因。

英文摘要：

The effect of adding nano-scale Alumna on mechanical properties and microstructure of micro-scale Ti（C,N） matrix cermet tool materials were investigated, which based on the mechanisms of grain improved fracture toughness. The results show that the mechanical properties of Ti（C,N） based cermet are greatly enhanced by adding nano-scale Alumna, especially the hardness and fracture toughness are improved significantly. The disadvantages of lower hardness and fracture toughness of Ti（C,N） ceramic cutting tool materials are eliminated. Through observing and analyzing the microstructure of the materials by SEM, it is considered that Ti（C,N） grains are fined by adding nano-scale Al2O3 particles, the main fracture mode of the material is transgranular fracture and the improvement of mechanical properties of the material is due to the transformation of fracture mode and refining of Ti（C,N） grains.