WC粉末粒度对Ti（C,N）基金属陶瓷组织和性能的影响

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Effect of WC Powder Size on the Microstructure and Properties of Ti（C,N）-based Cermets

1. Department of Aircraft Maintenance Engineering, Chengdu Aeronautic Polytechnic, Chengdu 610100, Sichuan, China;
2. School of Manufacturing Science and Engineering, Sichuan University, Chengdu 610065, Sichuan, China

摘要: 研究了WC粉末粒度对Ti (C, N) 基金属陶瓷Ti (C_0.7N_0.3) -15%WC-15%Ni显微组织和性能的影响。研究结果表明, 降低WC粉末粒度后组织中出现了大量的白芯-灰环结构的晶粒, 总体晶粒度均匀并得到细化 (2μm以下) 。细化的WC粉末不仅使WC的溶解速度增大, Ti (C, N) 的溶解速度也增大。细化WC粉末粒度可以提高金属陶瓷的硬度, 但是断裂韧性却有所下降。
- Ti(C,N)基金属陶瓷 /
- WC /
- 细化 /
- 显微组织 /
- 性能
Abstract: Mo₂C is normally added to improve the wettability between Ti （C,N） and Ni in Ti （C,N）-based cermets. Due to the increasing price of Mo₂C,much attention has been paid to Ti （C,N）-based cermets with WC addition. In this paper,the effect of WC powder size on the microstructure and properties of Ti(C_0.7N_0.3)-15% WC-15% Ni cermets free of Mo₂C was studied. The experimental results show that the cermet with smaller size of WC powder addition presents a white core and grey rim structure,and the grains have smaller size （average grain size is below 2 μm） and a uniform size distribution. Furthermore,the ultra-fine WC powder can not only raise its own dissolution rate but also that of Ti （C,N）. Although the ultra-fine WC powder can increase the hardness of the cermet,it makes the fracture toughness of the cermet have a reduction.
- Ti (C，N)-based cermets /
- WC /
- refinement /
- microstructure /
- properties