Abstract NiCoCrAlY coatings with and without Ta were plasma-sprayed onto Ti44Al6Nb1Cr alloy to investigate their microstructure and oxidation resistance at 900 °C for 100 h. The results indicated that the oxidation resistance of the NiCoCrAlY coating was better than that of the NiCoCrAlYTa coating. The formation of Al2O3 scale on the NiCoCrAlYTa coating was inhibited due to the low Al concentration and the dragging effect of Ta. Furthermore, loose NiO/CoO scale on the NiCoCrAlYTa coating promoted the inward diffusion of oxygen. As a result, an Al2O3 layer was formed at the interface, suppressing interdiffusion between coating and substrate.

中文翻译：

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Ti44Al6Nb1Cr合金上含和不含Ta的等离子喷涂NiCoCrAlY涂层的显微组织和氧化行为

摘要 将含和不含 Ta 的 NiCoCrAlY 涂层等离子喷涂到 Ti44Al6Nb1Cr 合金上，研究其微观结构和在 900 °C 下 100 h 的抗氧化性。结果表明，NiCoCrAlY涂层的抗氧化性能优于NiCoCrAlYTa涂层。由于低Al浓度和Ta的拖拽作用，NiCoCrAlYTa涂层上Al2O3氧化皮的形成受到抑制。此外，NiCoCrAlYTa 涂层上松散的 NiO/CoO 氧化皮促进了氧气的向内扩散。结果，在界面处形成了 Al2O3 层，抑制了涂层和基材之间的相互扩散。