New generation thermal barrier coatings for ultrahigh temperature applications

The research background, significance and current status of thermal barrier coatings (TBCs) for advanced gas turbine engines were highlighted. Research progress in new generation TBCs for ultra-high temperature applications was reviewed, which involved new ceramic topcoat materials with excellent high-temperature capability and thermal barrier performance, new metallic bond coat materials with good oxidation resistance at temperatures above 1150°C and chemical compatibility with the underlying advanced single crystal superalloys, design of novel TBC structure architecture with superior durability, and advanced manufacturing technologies of TBCs. The effects of the deposit under engine environment comprising calcium, magnesium, aluminum and silicon (CMAS) on the TBCs lifetime were discussed. Also, the approaches to mitigate CMAS attack of TBCs were summarized. Eventually, the prospective trends and hot research topics of new generation TBCs for ultra-high temperature applications were forecast.