Initial oxidation behavior of NiCoCrAlY coating prepared by arc-ion plating has been studied in air at 900, 1000 and 1100 °C. The results showed that phase transformation from transient θ-Al₂O₃ to α-Al₂O₃ was highly related to the temperature and oxidation time. The oxide scale in the initial stage was mainly composed of θ-Al₂O₃ at 900 °C. Instead, more amount of α-Al₂O₃ emerged out with increasing oxidation temperature. The elemental distribution after oxidation confirmed that faster chromium diffusion to the oxide scale played an important role in the speedy transformation from θ-Al₂O₃ to α-Al₂O₃. Y segregation at scale/coating interface resulted in less cavity formation and hence improved the oxide scale adherence.

研究了电弧离子镀制备的 NiCoCrAlY 涂层在 900、1000 和 1100 °C 空气中的初始氧化行为。结果表明，从瞬态θ-Al ₂ O ₃到α-Al ₂ O _{3 的}相变与温度和氧化时间高度相关。初始阶段的氧化皮主要由 θ-Al ₂ O ₃组成，温度为 900 ℃。相反，随着氧化温度的升高，出现了更多的α-Al ₂ O ₃。氧化后的元素分布证实，更快的铬扩散到氧化皮在 θ-Al ₂ O ₃的快速转变中起重要作用α-Al ₂ O ₃。氧化皮/涂层界面处的 Y 偏析导致较少的空腔形成，因此提高了氧化皮的附着力。