研究了带NiCrAlY,TiAlCr及搪瓷涂层的TiAlNb合金分别在800℃和900℃时的氧化行为.结果表明,3种涂层均能在一定程度上对基体合金提供防护,但氧化后,涂层和合金间出现了不同程度的反应和互扩散.氧化时,NiCrAlY涂层发生内氧化,且在NiCrAlY/TiAlNb界面互扩散严重,而界面的某些区域形成的保护性Al2O3虽能有效阻碍氧的内扩散,但也导致涂层从基体表面剥落;TiAlCr涂层表面形成连续Al2O3能对基体提供很好的防护,但涂层/合金界面出现的Nb和Cr的互扩散带可能会影响涂层寿命及基体合金的力学性能.在与TiAl合金接触时,搪瓷变得不稳定,氧化过程中,涂层与合金界面形成一定厚度的反应层,致使涂层与合金间结合力下降.
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