Cr₂AlC coating has potential applications as high temperature protective coating. However, inevitable interdiffusion at coating/substrate interface promotes Al depletion and deteriorates its oxidation resistance. In the present work, the oxidation behavior of a triple-layered Cr₂AlC coating, with (Cr,Al)₂O₃ inner layer, amorphous intermediate layer and crystalline Cr₂AlC outer layer, was investigated at 900 and 1000 °C in air. The effect of the (Cr,Al)₂O₃ inner layer as diffusion barrier was evaluated during the oxidation process. It is showed that the triple-layered Cr₂AlC coating could effectively improve the oxidation resistance of the M38G alloy substrate, due to the Cr₂AlC outer layer. The (Cr,Al)₂O₃ inner layer could prohibit internal nitridation and retard interdiffusion at the coating/substrate interface, improving oxidation resistance of the triple-layered Cr₂AlC coating. Furthermore, cracking of the triple-layered Cr₂AlC coating was found after oxidation at 900 and 1000 °C, due to the thermal stress and internal stress introduced by intermediate amorphous layer crystallization during oxidation.

Cr ₂ AlC 涂层具有作为高温保护涂层的潜在应用。然而，涂层/基材界面不可避免的相互扩散会促进铝的消耗并降低其抗氧化性。在目前的工作中，三层 Cr ₂ AlC 涂层的氧化行为，具有 (Cr,Al) ₂ O ₃内层，非晶中间层和结晶 Cr ₂ AlC 外层，在 900 和 1000 °C 下进行了研究。空气。在氧化过程中评估了 (Cr,Al) ₂ O ₃内层作为扩散阻挡层的效果。结果表明，三层 Cr ₂由于 Cr ₂ AlC 外层，AlC 涂层可以有效提高 M38G 合金基体的抗氧化性。(Cr,Al) ₂ O ₃内层可以抑制涂层/基材界面处的内部氮化和相互扩散，提高三层Cr ₂ AlC涂层的抗氧化性。此外，由于氧化过程中中间非晶层结晶引入的热应力和内应力，在 900 和 1000 °C 氧化后发现三层 Cr ₂ AlC 涂层开裂。