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采用超音速等离子喷涂技术在45#钢基体上制备Ni60合金涂层,对预制的涂层分别进行高频感应重熔和感应重熔+强制冷却处理。借助OM、SEM、XRD、显微硬度计和销盘式摩擦磨损试验机对3种涂层的组织结构、显微硬度分布及摩擦磨损性能进行分析,研究Ni60合金涂层组织结构及其性能的演变特征。结果表明:3种涂层组织结构差异较大,单纯感应重熔涂层使喷涂涂层组织结构细密化,感应重熔+强制冷却的涂层形成了外延型生长的定向晶结构。喷涂涂层硬度自内向外呈明显下降趋势,而后续处理的2种涂层均表现为自内向外略为增加趋势,导致喷涂涂层尽管有较高的平均硬度,但表层硬度低于其他2种涂层。3种涂层均有很好的耐磨性能,但后续处理使涂层的摩擦系数明显增大,耐磨性能显著增强,尤其附加强制冷却的涂层表现出更加优异的耐磨性能,其平均磨损率分别低于喷涂涂层约8.5倍和单纯感应重熔涂层约2倍。
The Ni60 alloy coating was prepared on 45 # steel substrate by supersonic plasma spray technique. The prefabricated coatings were treated by high frequency induction remelting and induction remelting + forced cooling. The microstructure and microhardness distribution and friction and wear properties of the three coatings were analyzed by means of OM, SEM, XRD, microhardness tester and pin-plate friction and wear tester. The microstructure and properties of Ni60 alloy coating Evolutionary features. The results show that the structure of the three kinds of coatings is quite different. The microstructure of the sprayed coating is refined by the induction of the remelted coating, and the epitaxial growth of the oriented crystal structure is formed by induction remelting and forced cooling. The hardness of the sprayed coatings decreased obviously from the inside to the outside, while the two coatings treated subsequently showed a slightly increasing trend from the inside to the outside, resulting in the spray coating having a lower surface hardness than the other two despite the higher average hardness coating. All the three coatings have good wear resistance, but the subsequent treatment makes the coating significantly increase the friction coefficient, significantly improved wear resistance, especially with forced cooling coating showed more excellent wear resistance, the average The wear rates are about 8.5 times lower than the spray coating and about 2 times the simple induction remelting coating.