目的 采用等离子转移弧堆焊技术制成镍基球形碳化钨复合涂层，研究碳化钨含量对复合涂层摩擦磨损性能的影响，以用于实际生产开发。方法 碳化钨质量分数分别为20%、30%、50%、60%的镍基混合粉末通过等离子堆焊方法制备成复合涂层，并采用Bruker公司生产的万能摩擦磨损试验机对镍基碳化钨复合涂层的侧面进行摩擦磨损性能测试。对各组涂层的表面形貌、摩擦系数、划痕横截面积及磨损面的微观形貌进行对比分析，探究碳化钨的含量对复合涂层摩擦磨损性能的影响。结果 等离子转移弧堆焊镍基球形碳化钨复合涂层的耐磨性能随着碳化钨含量的增大而增大，同时近熔合区基体的耐磨性能也不断提高。当碳化钨质量分数小于50%时，主要发生的是粘着磨损和氧化磨损；当碳化钨质量分数大于50%时，主要发生的是粘着磨损和磨料磨损。结论 由于碳化钨的存在以及增强相的不断生成，随着碳化钨含量的增大，复合涂层的磨损性能不断提高。出于性能和成本考虑，当碳化钨质量分数为50%时更适合实际应用。

The work aims to study the influence of different WC contents on the wear resistance of Ni-based WC composite coatings deposited by the plasma transfer arc, so as to expand the use in practice. Ni-based composite coatings were sintered by plasma transferred arc welding with 20%, 30%, 50% and 60% content. Cross-sectional friction wear tests were conducted with multifunctional friction and wear tester made by Bruker corporation. By observing morphology, friction coefficient, cross-sectional area and microstructure of wear track, the influence of WC content on the wear resistance of composite coating was investigated. The results indicated that the wear resistance of Ni-based WC composite coatings deposited by the plasma transfer arc welding rose while the content of WC increased; meanwhile the wear resistance of the base near the fusion zone was also improved. When the content of WC was less than 50%, adhesive wear and oxidative wear mainly existed. When it exceeded 50%, adhesive wear and abrasive wear mainly happened. Due to the existence of WC and the continuous generation of wild phase, the wear resistance of composite coating will be continuously improved with the enhancement of the WC content. For the sake of performance and cost, WC of 50wt.% is more suitable for practical applications.