(1. 華南理工大學機電工程系，廣州 510641；
2. 哈爾濱工業(yè)大學材料科學與工程學院， 哈爾濱 150001)
摘 要: 在大氣條件下經(jīng)高溫長時間保溫后，ZrO2-NiCoCrAlY梯度涂層中的NiCoCrAlY組元發(fā)生嚴重氧化，形成大量的NiO，Al2O3和Cr2O3等氧化物，導致ZrO2表面層中產(chǎn)生粗大網(wǎng)狀裂紋，并最終導致ZrO2表面層碎裂而失效。對梯度涂層進行(900℃)保溫(8 h)的真空熱處理后，涂層完好無損，Ni-CoCrAlY底層與TC4基體發(fā)生了冶金化學反應(yīng)，在涂層與基體界面形成了含NiTi，NiTi2和TiAl3等化合物的反應(yīng)層，涂層的抗熱震性能得以顯著地提高。
關(guān)鍵字: 等離子噴涂；熱障涂層；熱處理；抗熱震性
（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
