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以45~96μm纯Mo粉为喷涂粉末,在两种喷涂参数下采用超音速等离子喷涂工艺在45Cr Ni Mo VA钢表面制备了均匀致密、氧化量极少的Mo涂层,研究了不同参数下涂层微观结构、显微硬度、结合强度及耐磨性。结果表明,喷涂功率和气体流量略大的1号涂层各项性能均优于2号涂层。1号涂层的显微硬度为354 HV0.1,内聚强度为35 MPa;拉伸断口呈“微凹坑”、“微凸起”及塑性断裂后留下的微皱褶;10 N干摩擦下涂层磨损率高于基体,为粘着磨损机理,50 N润滑条件下涂层磨损率是基体的1/3,为磨粒磨损机理。
With 45 ~ 96μm pure Mo powder as the spray powder, the Mo coating with uniform and compact and little oxidation amount was prepared by supersonic plasma spray coating on the surface of 45Cr Ni Mo VA steel with two spraying parameters. Layer microstructure, microhardness, bond strength and wear resistance. The results show that the performance of coating No. 1 with slightly larger spray power and gas flow is better than that of coating No. 2. The microhardness of coating No. 1 was 354 HV0.1 and the cohesive strength was 35 MPa. The tensile fracture was micro-pits, micro-bumps and micro-wrinkles left after plastic fracture The wear rate of the coating under 10 N dry friction is higher than that of the matrix, which is the adhesion wear mechanism. The coating wear rate under 50 N lubrication is 1/3 of the matrix, which is the abrasive wear mechanism.