热障涂层系统损伤与断裂研究进展

Advances in Damage and Fracture of Thermal Barrier Coatings

热障涂层(thermal barrier coating,TBC)具有隔热、抗氧化、抗腐蚀和抗冲刷等性能,能进一步提高热端部件服役温度和使用寿命,是航空发动机和燃气轮机关键核心技术之一。在高温、高压、强氧化和强腐蚀的服役环境中,热障涂层系统(thermal barrier coatings,TBCs)易发生涂层脱粘、起泡、屈曲、开裂、剥落等形式的失效,严重影响热端部件的服役寿命。因此,研究TBCs损伤与断裂对于保障高温叶片等热端部件的安全稳定运行具有重要意义。针对TBCs损伤与断裂问题,重点介绍了近年来TBCs的失效机理、本构模型、损伤与断裂的力学分析方法方面的研究成果,在热循环/热冲击和热机械载荷作用下、腐蚀环境下TBCs的损伤与断裂行为,以及TBCs强度试验与损伤检测方法的研究进展,分析总结了TBCs损伤与断裂研究的发展趋势,力求为我国航空发动机和燃气轮机的基础研究和技术开发提供支撑。

Thermal barrier coating(TBC)is one of the key technologies of aeroengine and gas turbine,which can improve the service temperature and service life of hot end components due to their abilities to insulate against the heat transfer and resist the oxidation,corrosion and erosion.Under the conditions with high temperature and pressure,strong oxidation and corrosion,thermal barrier coatings(TBCs)are prone to failure in the form of coating debonding,blistering,buckling,cracking and spalling,which seriously limits the service life of hot end components.Therefore,it is of great significance to study the damage and fracture mechanism of TBCs to ensure the safety and stability of high-temperature blades and other hot end components in service.This article presents a comprehensive overview of development of TBCs,including:①the damage and fracture behaviors and failure mechanisms of TBCs,②constitutive model,③damage and fracture mechanics method and their behaviors under harsh environment,④the development of TBCs strength test and damage detection methods,⑤perspective for the study on damage and fracture of TBCs.The aim of this work is to provide support for basic research and technology development of aeroengine and gas turbine in China.