Ni基自熔合金涂层与钢基材的界面形态及其作用

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

Study on the Morphology and Action of the Interface Between Ni Base Self-fluxing Alloy Coating and Steel Substrate

The interface morphology between WC enhanced Ni base self-fluxing alloy coating and 3SCrMoAI steel substrate ,which were fabricated respectively by oxyacetylene flame spraywelding,plasma spraying oxyacetylene flame re-melting, plasma spraying re-melting in electric furnace, was investigated. The results show that the composition diffusion between the coatings and substrate occurs during the coatings - melting process ,which mainly is Fe element in substrate diffusing into the melted coating. The composition diffusion has definitive influence on the interface morphology. When the temperature of substrate surface is high enough, there will be amount of Fe element diffusing into the coating, and a thin and dense layer of Fe-Ni solution phase forms at the interface between the coating and substrate. So the adherent strength will be improved remarkably and the coating will have excellent anti-spell property.