简介概要

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.



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