等离子喷涂ZrO2-NiCoCrAlY梯度涂层的界面强化热处理工艺
来源期刊：中国有色金属学报1999年第3期
论文作者：向兴华 刘正义 李尚周 尹钟大 朱景川
文章页码：520 - 525
关键词：等离子喷涂；热障涂层；热处理；抗热震性
Key words：plasma spraying；thermal barrier coating；heat treatment；thermal shock resistance
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。
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.
