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在大气条件下经高温长时间保温后,ZrO2NiCoCrAlY 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, NiCoCrAlY 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
The NiCoCrAlY in the ZrO2NiCoCrAlY gradient coating undergoes serious oxidation after a long time heat-preservation at high temperature under atmospheric conditions, resulting in a large amount of oxides such as NiO, Al2O3 and Cr2O3, resulting in coarse network cracks in the ZrO2 surface layer Eventually resulting in the destruction of ZrO2 surface layer failure. After vacuum heat treatment of the gradient coating (900 ℃) for 8 h, the coating was intact. The metallurgical reaction between the NiCoCrAlY undercoating and the TC4 matrix took place. At the interface between the coating and the substrate, NiTi, NiTi2 and TiAl3 and other compounds of the reaction layer, coating thermal shock resistance can be significantly improved