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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 Coating is an advanced anti-corrosion and anti-corrosion high temperature coating, widely used in aerospace turbine blades. Its multi-layer structure and complex service environment often lead to the failure of interfacial interface cracks and coating delamination. Residual stress as a direct cause of the induced crack growth and expansion, the detection of residual stress evolution has important guiding significance for the study of coating failure, is also one of the most widely studied. The formation and main influencing factors of residual stress in each layer of thermal barrier coating are introduced. The principle and research progress of the stress detection method in multilayer interface of thermal barrier coating / superalloy system are expounded. At the same time, Thermal barrier coating in the scope and advantages and disadvantages.