NiCoCrAlY coatings were prepared using arc-ion-plating on a second generation Ni-base single crystal superalloy, in which some of them underwent vacuum annealing treatment while the others did not. Early oxidation behavior of the two coatings, including phase pattern and morphological evolution of oxide scale during the short term oxidation, has been studied in static air at 1000 °C. The results showed that the vacuum treatment was not only efficient in inhibiting the cavity formation, but also significantly increased the adhesion between oxide scale and coating. Compared with those without vacuum annealing, the NiCoCrAlY coatings with vacuum treatment exhibited slower phase transformation from metastable θ-Al₂O₃ to stable α-Al₂O₃. Initial oxidation behavior of as-received and annealed coatings, especially the effect of vacuum annealing on morphology evolution and adhesion of oxide scale, are particularly discussed.

NiCoCrAlY涂层是通过在第二代Ni基单晶高温合金上进行电弧离子镀制备的，其中一些经过了真空退火处理，而其他则没有进行。已经在1000°C的静态空气中研究了两种涂层的早期氧化行为，包括短期氧化过程中的相图和氧化物垢的形态演变。结果表明，真空处理不仅有效抑制了空腔的形成，而且显着提高了氧化皮与涂层之间的附着力。与那些没有真空退火相比，涂层的NiCoCrAlY用真空处理从表现出较慢的亚稳相变θ-Al系₂ ö ₃至稳定的α-Al ₂ ö ₃。特别讨论了原样和退火涂层的初始氧化行为，特别是真空退火对形态演变和氧化皮附着力的影响。