Cu含量对Ni基定向合金涂层组织与摩擦学性能的影响

Effect of Cu Content on Microstructure and Tribological Properties of Ni-Based Directional Structure Alloy Coatings

采用火焰喷涂+感应重熔+强制冷却复合技术制备了Cu添加的Ni60/Cu定向结构复合涂层。研究了Cu含量对Ni60/Cu定向结构涂层微观组织、物相演变、微观硬度及摩擦磨损性能的影响。结果表明:在定向结构涂层形成过程中,Cu元素持续向晶粒内部扩散,导致涂层随着Cu含量增加,硬度持续降低。Cu含量对涂层显微组织产生重要影响,当Cu含量为15%时,涂层定向结构组织呈垂直于界面生长特征,微观结构细密规整。当Cu含量为15%时,涂层以磨粒磨损为主,显示出最低的摩擦系数和最小的磨损率,充分发挥了Cu元素的减摩效果,但过量的Cu元素添加反而使涂层耐磨性能变差。

The Cu-added Ni60/Cu directional structure composite coating was prepared by flame spraying+induction remelting+forced cooling composite technology.The effects of Cu content on the microstructure,phase evolution,microhardness and friction and wear properties of Ni60/Cu oriented structure coating were studied.The results show that the Cu element diffuses continuously into the grain during the formation of the directional structure coating,resulting in a continuous decrease in the hardness of the coating as the Cu content increases.The content of Cu has an important influence on the microstructure of the coating.When the Cu content is 15%,the directional structure of the coating shows a growth characteristic perpendicular to the interface,and the microstructure is f ine and regular.The coating is mainly abrasive wear,which shows the lowest friction coefficient and the lowest wear rate,and gives full play to the fri ction reducing effect caused by Cu element when the Cu content is 15%.However,the excessive addition of Cu makes the wear resistance of the coating worse.