王志平,林小娉,贾鹏,丁坤英

• 1:中国民航大学天津市民用航空器适航与维修重点实验室
• 2:东北大学秦皇岛分校材料科学与工程系

摘要(Abstract)：

采用等离子喷涂技术在高温合金上制备了热障涂层(粘接层为NiCoCrAlY,陶瓷层为ZrO2-8%Y2O3),利用扫描电镜(SEM)、拉曼光谱(RFS)等试验手段研究了热障涂层热震失效的过程及残余应力大小和分布状态。结果表明:150次热循环后,陶瓷层和热生长氧化物(TGO)生成裂纹,其中陶瓷层的裂纹已扩展至TGO;350次热循环后,出现贯通陶瓷层与金属过渡层的纵向裂纹,涂层局部出现剥离,剥离位置位于TGO与陶瓷层界面;拉曼光谱(RFS)分析结果显示TGO内应力水平分布不均,局部厚大区和凸凹处残余应力较大,是裂纹萌生、扩展的主要部位。

关键词(KeyWords)： 热障涂层;热循环;残余应力;热生长氧化物

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(60879018)

作者(Author): 王志平,林小娉,贾鹏,丁坤英

DOI: 10.13289/j.issn.1009-6264.2012.04.025

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