热障涂层氧化残余应力大小与演化过程测试.pdf

第十一届全国实验力学学术会议 大连 2005 1热障涂层氧化残余应力大小与演化过程测 试 1 1 2 王峰会 ，张勇 王泓 1 西安市西北工业大学工程力学系， 2 西北工业大学材料学院 西安 710072 摘要：热障涂层是一种应用广泛的提高高温部件工作效率的技术，在通常的涂层中，粘阶层 起到过渡和保护基体氧化的作用，在高温环境下，粘阶层会发生氧化，而氧化产生的残余应 力将引起热障涂层的损伤，表现为涂层的屈曲，起裂和剥落，导致热障涂层失效。研究测试 和监测涂层的残余应力，对于评估涂层的安全性和寿命是非常重要的。本文用应力引起光学 频谱位移的方法测试了空气等离子喷涂热障涂层中残余应力的大小，并测试了残余应力的大 小随氧化时间的变化。 关键词：热障涂层，残余应力，光学测试技术 Residual stress and damage evolution in TBCs by optical method Wang FH Zhang Yong Wang Hong (Department of Engineering Mechanics and College of Material Science and Engineering, Northwestern Polytechnical University, XI’an 710072) Abstract: In recently years, ruby fluorescence spectroscopy has been demonstrated as a powerful technique for monitoring residual stress evolution in the thermally grown oxide scale in thermal barrier coatings(TBC) systems. The measured residual stresses, in turn can be used to monitor evolution of damage in the coatings. Effective use of this technology for real time damage monitoring require the identification of strength in measured stresses that can be used as indicators of damage evolution. the present work focuses on studying the evolution od residual stresses in TBC systems during oxidation. The coating are atmospheric plasma sprayed (APS), the residual stress were measured at different oxidation time and to identify critical features so as to be used as indicators of failure in TBCs. Key Words: TBCs, residual stress, fluorescence spectroscopy. 1 、前言 随着燃气轮机技术的发展,对构件的温载承受能力的要求也越来越高，热防护问题已成为发 动机使用效率和寿命关键问题之一。传统的改进高温合金材料提高熔点,优化冷却流路,改善 冷却方式等诸多降温保护方法也都基本趋于成熟,进一步发展已受到一定限制。热障涂层技 术是目前正在发展的新的热防护技术,其基本思路是:在热端部件上喷涂一层很薄的隔热陶瓷 1 国家自然基金资助项目，项目编号 联系人：王峰会