WC粉末粒度对Ti(C,N)基金属陶瓷组织和性能的影响

研究了WC粉末粒度对Ti(C,N)基金属陶瓷Ti(C_(0.7)N_(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。

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

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 Mo2 C,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(C0.7N0.3)-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.