采用等离子喷涂技术在TC4钛合金表面制备了Ni基WC耐磨涂层,利用扫描电镜、能谱仪、显微硬度仪、摩擦磨损试验机、X射线应力仪等研究了涂层的微观组织、成分、硬度、磨损量、磨损机制及残余应力特性等.结果表明:涂层呈现典型的层状结构,与基体结合良好,面层孔隙率为4.7％.显微硬度由表及里呈梯度变化,在798～990 HV0.3之间波动,同载荷下基体体积磨损量是涂层的8.9倍,基体磨损机制主要为磨粒磨损和黏着磨损,涂层磨损机制以磨粒磨损为主.涂层表面无裂纹存在,分布着压应力状态的残余应力.%Ni-based WC wear-resisting coatings were prepared on the surface of TC4 titanium alloy by plasma spraying technology. The coatings' properties such as microstructure, component, microhardness, abrasion loss, wear mechanism and residual stress were investigated by scanning electron microscope (SEM) , energy dispersive spectrometer (EDS), microhardness tester, friction wear test equipment, X-ray residual stress measurement tester, and so on. The results demonstrate that the coatings show typical layer structure and bond well with the TC4 substrate, the porosity of Ni+30%WC coating is 4. 7%. The microhardness presents gradient change from the coating to the substrate, which fluctuates in 798 ~ 990 HV0.3. The wear volume of the substrate is 8. 9 times of coating under the same load. The wear mechanism of the substrate are mainly abrasion wear and adhesive wear, while the coating is mainly abrasion wear. The coating surface has no cracks and its residual stress is compressive stress.
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