激光熔敷耐磨梯度复合涂层的研究

利用激光熔敷方法在Ａ３钢表面制备ＷＣ梯度涂层，并分析了涂层的微观结构、硬度及耐磨性。结果表明，涂层的组织为镍基固溶体加少量硼化物、碳化物及硬质相ＷＣ，其中ＷＣ颗粒的粒度及含量沿母材向表面方向呈梯度变化。涂层的硬度和耐磨性随着成分的变化而平缓变化，界面应力降低，涂层与基体结合牢固。

The Study on Wear-resistant Graded Layer Coated by Laser-Alloying

A wear-resistant graded WC coating on steel A3 substrate was made by for-alloying. The micro-structure, hardness and the wear resistance of the layer were examined. The layer contained solid solu tions with Ni-matrix, Ni-matrix, borides carbides hardening phase WC grains. The volume and content of WC grains varied gradually from surface to substrate, the hardness and the wear-resistance of the coating also mutate grad ually, in the advantage of that, the interfacial stress decreased. Therefore, the coating had a excellent bonding with substrate.