微米/纳米Ti(C,N)基金属陶瓷刀具材料的研制

Study on the Micron/Nano-Scale Ti(C,N) Based Cermet Tool Materials

系统研究了添加纳米级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。通过对微观结构观察和分析,可以看出,纳米Al2O3的添加细化了基体的晶粒,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。

The effect of adding nano-scale alumna on mechanical properties and microstructure of micron-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 influenced by adding nano-scale alumna, especially the hardness and fracture toughness improved significantly. At the same time the disadvantages of low hardness and fracture toughness of Ti（C,N） ceramic cutting tool materials are eliminated. The microstructure observation and analysis by SEM show that Ti（C,N） grains are fined by nano-scale Al2O3 particles, and transgranular fracture mode of the material is mainly observed. The improvement of mechanical properties is due to the transformation of fracture mode and fining of Ti（C,N） grains.