研究了等离子喷涂两层热障涂层在大气和真空环境下 ,经 110 0℃不同时间扩散处理后相结构的变化。结果表明 ,喷涂过程中 ,Zr O2 发生 M相→T相转变 ;经大气环境扩散处理后 ,Zr O2 发生 T相→M相转变 ,Ni Cr Al Y相被氧化形成 Al2 O3和 Ni Al2 O4 相 ,同时 r′- Ni3Al相有强烈的择优取向。 The phase structure of the plasma sprayed two-layer thermal barrier coatings was studied after being diffused at 110 ℃ for different time under atmospheric and vacuum conditions. The results show that during the spraying process, the transformation of M phase → T phase takes place in ZrO 2; the transformation of T phase to M phase in ZrO 2 occurs after the atmospheric diffusion; the phase of NiCuAlY is oxidized to form Al 2 O 3 and NiAl 2 O 4 phase, At the same time r’-Ni3Al phase has a strong preferred orientation.