镍基合金上Pt-Al涂层的高温氧化行为研究

High Temperature Oxidation Behavior of Platinum Modified Aluminide Coatings on Nickel-Based Superalloys

采用电镀铂之后渗铝的方法在GH586镍基高温合金上制备铂铝(Pt-Al)涂层,采用扫描电子显微镜(SEM)、X射线衍射仪、电子能谱仪等方法研究分析其高温抗氧化性能。结果表明,Pt-Al涂层具有优良的抗高温氧化性能,Pt的加入,在涂层与基体的互扩散中起到了扩散障的作用,抑制了基体合金元素向外层扩散,优化了材料的选择性氧化。同时,对Pt元素在其中的作用机制进行探讨。

The high-temperature oxidation resistance behavior of Pt-Al coatings prepared by the electroplating of platinum with the following pack cementation of aluminum on nickel-based superalloys GH586 was studied by SEM, XRD and EDS. The results show that high temperature oxidation resistance of the Pt-Al coatings is excellent. The addition of platinum can prevent the diffusion of the alloy elements in the superalloys outwards to surface layer, and thus increase the high temperature oxidation resistance of coatings. The operation mechanisms of platinum on oxidation behavior were also discussed.