【摘要】 采用薄带钎料粘贴在CoCrW预置层表面进行真空加热,实现了真空熔结制备涂层的新方法,对涂层的组织和抗微动磨损性能进行了研究。结果表明:涂层组织致密,涂层与基体和Ni基钎料与CoCrW粉末颗粒之间能够形成良好的冶金结合。熔结涂层组织由Co基和Ni基固溶体以及Co₆W₆C,Cr₇C₃,W₂C,Ni₃B,CrB等硬质相组成。基于致密的组织、良好的冶金结合和综合力学性能,真空熔结CoCrW涂层显示出优秀的抗微动磨损性能。更多还原

【Abstract】 A novel vacuum melting method, which was characterized by the application of brazing foil, was proposed. With BNi-2 nickel-based brazing foil, a pre-placed CoCrW adhesive coating was melted in a vacuum furnace. The microstructure and fretting wear resistance of the coating were studied. The results showed that fully dense coating was obtained. A good metallurgical bonding was achieved not only between coating and substrate but also hard phases and bonding phases. The microstructure of the coating was composed of hard phases such as Co6W6C, Cr7C3, W2C, Ni3B, CrB and ductile phases including nickel-based and cobalt-based solid solutions. Based on the dense microstructure, the excellent metallurgical bonding and the hard phases strengthening, it is found that the fretting wear resistance of vacuum melting CoCrW coating was remarkably superior to the plasma spraying CoCrW coating and 1Crl8Ni9Ti stainless steel.更多还原