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采用等离子喷涂和激光重熔复合工艺在AZ91D镁合金表面制备Al-Si-Cu合金涂层,利用扫描电子显微镜(SEM)、显微硬度计、摩擦磨损试验机等研究了涂层的微观组织、显微硬度与摩擦磨损性能。结果表明,激光重熔后涂层组织致密均匀,涂层与基体呈良好的冶金结合,涂层显微硬度约为基体的2.2倍,由于晶粒细化和硬质相的存在耐磨性较基体明显提高,重熔层的磨损机制主要为磨粒磨损。
The Al-Si-Cu alloy coating was prepared on the surface of AZ91D magnesium alloy by plasma spraying and laser remelting. The microstructure of the coating was studied by scanning electron microscopy (SEM), microhardness tester, friction and wear tester, Microhardness and friction and wear properties. The results show that the microstructure of the coating is dense and uniform after laser remelting, and the coating has a good metallurgical bond with the substrate. The microhardness of the coating is about 2.2 times that of the matrix. Because of the grain refinement and the wear resistance of the hard phase, The substrate is obviously improved, and the wear mechanism of the remelted layer is mainly abrasive wear.