Cubic fluorite-based lanthanum cerium oxide thermal barrier top-coat fabrication, properties, and performance: Present status and prospects
K. Praveen, Heejin Kim, G. Sivakumar, Min Wook Lee
Abstract
Lanthanum cerium oxide (La2Ce2O7, LC) is one of the emerging ceramic thermal barrier coatings (TBC) owing to its low thermal conductivity and a high coefficient of thermal expansion compared with conventional yttria-stabilized zirconia (YSZ). This review summarizes powder production, thermophysical properties, coating processes, thermal durability, mitigation against calcium magnesium alumino-silicate attack and volcanic ash, high-temperature corrosion, and doping of other rare-earth oxides to enhance their properties and performance. The advantages of developing hybrid, double-layered, and multi-layered coatings are discussed to improve the high-temperature corrosion resistance and lifetime of the coatings. The improved LC-TBCs for commercial usage and the prolonged life of components with improved properties are presented in detail.