Abstract Three types of NiAlSiY coatings with different aluminum concentration were prepared. The isothermal oxidation behavior and mechanism of coatings at 500 °C were studied. The results indicate a multilayer oxide layer composed of NiO outer layer and Al2O3 inner layer is formed on the surface. The diffusion of aluminum in the coating and the phase transition from β-NiAl to γ'-Ni3Al promote the formation of Al2O3. Silicon plays an important role in the diffusion of aluminum by refining grains. When the aluminum is 21 wt.%, a dense Al2O3 layer can be formed on the NiAlSiY coating after oxidation for 30 h.

中文翻译：

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500 ℃下铝浓度对NiAlSiY涂层组织和氧化层演化行为的影响

摘要 制备了三种不同铝浓度的NiAlSiY涂层。研究了涂层在 500°C 下的等温氧化行为和机理。结果表明在表面形成了由NiO外层和Al2O3内层组成的多层氧化层。铝在涂层中的扩散和从 β-NiAl 到 γ'-Ni3Al 的相变促进了 Al2O3 的形成。硅通过细化晶粒在铝的扩散中起重要作用。当铝含量为 21 wt.% 时，氧化 30 h 后可在 NiAlSiY 涂层上形成致密的 Al2O3 层。