热障涂层界面应力测试研究进展

Research Progress of Interfacial Stress Measurement in Thermal Barrier Coatings

热障涂层为先进的抗热防腐高温防护涂层,广泛应用于航空航天的燃气涡轮叶片上。其多层结构特点以及复杂的服役环境往往造成层间界面裂纹与涂层剥离的失效形式。残余应力作为诱导裂纹产生和扩展的直接原因,检测残余应力的演变对研究涂层失效有着重要的指导意义,也是研究最为广泛的内容之一。介绍了热障涂层各层间残余应力的形成与主要影响因素,阐述了热障涂层/高温合金体系多层界面结构的应力检测方法的检测原理与研究进展,同时比较了这些检测技术在热障涂层中的适用范围以及优缺点。

Thermal barrier coatings is a kind of advanced heat-resistant protective coating, which has been ex- tensively used in aerospace gas turbine blades. However, its multi-layer structure and complex service environment of- ten result in interfacial cracks and coating spalling. The evolution of residual stress has important significance for the studies of coating failure mechanism and is widely studied, for it is the direct cause to the crackinitiation and propaga- tion. In this paper, the formation and primary influence factors of residual stress as well as the principles and research progress of various testing technologies are reviewed. Besides, the characteristics and the availabilities of these mea- surement technologies used for thermal barrier coatings are contrasted.