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Effect of Vacuum Pre-oxidation Treatment on Oxidation Behavior of Thermal Barrier Coating
Author(s): DU Zhong, WANG Quan-sheng, LIU Yan-bo, LI Yun-kai
Pages: 27-
31
Year: 2015
Issue:
5
Journal: Journal of Aeronautical Materials
Keyword: thermal barrier coating; vacuum pre-oxidation; high temperature oxidation; thermally grown oxide;
Abstract: 利用超音速火焰喷涂技术在DZ40M合金表面制备了NiCoCrAlY粘结层,采用等离子喷涂技术在粘结层表面制备了陶瓷面层,并对整体热障涂层进行了真空预氧化处理.通过高温静态氧化实验研究了真空预氧化对热障涂层的氧化行为的影响.结果表明:真空预处理可在MCrAlY粘结层和陶瓷面层的界面处形成连续、致密的α-Al2O3层;在1050℃下氧化800h后,喷涂态涂层TGO中除α-Al2O3外,还生成了大量尖晶石氧化物,而预氧化涂层TGO则以α-Al2O,为主;预氧化处理有效抑制了涂层在高温氧化过程中尖晶石氧化物的形成,从而降低了整体氧化膜的生长速率.
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