(1. 华南理工大学机电工程系，广州 510641；
2. 哈尔滨工业大学材料科学与工程学院， 哈尔滨 150001)
摘 要: 在大气条件下经高温长时间保温后，ZrO2-NiCoCrAlY梯度涂层中的NiCoCrAlY组元发生严重氧化，形成大量的NiO，Al2O3和Cr2O3等氧化物，导致ZrO2表面层中产生粗大网状裂纹，并最终导致ZrO2表面层碎裂而失效。对梯度涂层进行(900℃)保温(8 h)的真空热处理后，涂层完好无损，Ni-CoCrAlY底层与TC4基体发生了冶金化学反应，在涂层与基体界面形成了含NiTi，NiTi2和TiAl3等化合物的反应层，涂层的抗热震性能得以显著地提高。
关键字: 等离子喷涂；热障涂层；热处理；抗热震性
（1. Department of Mechanical Engineering, South China University of Technology，Guangzhou 510641, P.R.China
2. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, P.R.China）
Abstract:After heat treatment at high temperature for a long time in air, the NiCoCrAlY component oxidized seriously and a lot of NiO, Al2O3 and Cr2O3 formed in plasma sprayed ZrO2-NiCoCrAlY graded coating, which is the primary reason to induce the ZrO2 top layer breaking and spalling at last. After heat treatment in vacuum at 900℃ for 8 h, the graded coating undamaged, and a chemical-metallurgical reaction layer which contains some NiTi, NiTi2 and TiAl3 formed between NiCoCrAlY bond layer and TC4 substrate, so the thermal shock property of the graded coating improved remarkably.
Key words: plasma spraying；thermal barrier coating；heat treatment；thermal shock resistance
