对采用氧 -乙炔火焰喷焊、等离子喷涂后氧 -乙炔火焰重熔与等离子喷涂后炉内重熔三种工艺制备的WC增强Ni基自熔合金涂层与 38CrMoAl钢基材的结合界面形态的研究表明 ,在涂层熔化过程中 ,涂层与基材之间发生成分的互扩散 ,以基材中的元素Fe向熔融涂层中的扩散为主 ,其扩散程度对涂层与基材能否形成良好的冶金结合具有决定性的影响。当结合界面处的基材表层温度足够高时 ,基材中的元素Fe向涂层中的扩散量较大 ,扩散距离较长 ,在界面处就能够形成致密完整的Fe -Ni单相固溶体组织白亮层 ,使涂层与基材获得很高的结合强度 The interface morphology of WC-enhanced Ni-based self-fluxing alloy coating with 38CrMoAl steel substrate prepared by oxygen-acetylene flame spray welding, plasma spraying oxygen-acetylene flame remelting and remelting furnace after plasma spraying The results show that during the melting process of the coating, the mutual diffusion of the components occurs between the coating and the substrate, and the diffusion of the elemental Fe in the substrate into the molten coating is dominant. No good metallurgical bond formation has a decisive impact. When the surface temperature of the substrate at the bonding interface is high enough, the amount of elemental Fe diffused into the coating is larger and the diffusion distance is longer, and a dense and complete Fe-Ni single phase solid solution structure can be formed at the interface White bright layer, the coating and the substrate to obtain high bonding strength