Thermal barrier coating(TBC)is a critical technology for hot sections of aeroengines and gas turbines.The development of TBC can significantly improve fuel efficiency and thrust-to-weight ratio of engines,allowing them to operate at higher temperatures.However,this has also led to increasingly serious high-temperature corrosion issues for TBC.High-temperature corrosion includes environmental deposition corrosion,namely CaO,MgO,Al2O3 and SiO2(CMAS)induced corrosion,molten salt corro-sion,and the coupling corrosion of CMAS and molten salts,which cause premature failure of TBC and pose a serious threat to the safe operation of aero-engines and gas turbines.This paper reviews the dis-covery process of these corrosion problems and their reaction mechanisms with TBC at high tempera-tures,and summarizes the current international research progress on the corrosion-resistant TBC from two aspects,i.e.,new TBC materials development and novel coating microstructure design.By compre-hensively sorting out the corrosion problems and protection methods of TBC at high temperatures,the pa-per provides a perspective on the research direction for developing long-lifetime and corrosion-resistant TBC.
关键词
热障涂层/CMAS腐蚀/熔盐腐蚀/耦合腐蚀
Key words
thermal barrier coating/CMAS corrosion/molten salt corrosion/coupling corrosion
维普
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