Improvement strategy on thermophysical properties of A_(2)B_(2)O_(7)-type rare earth zirconates for thermal barrier coatings applications:A review  

作　　者：Zijian Peng Yuhao Wang Shuqi Wang Junteng Yao Qingyuan Zhao Enyu Xie Guoliang Chen Zhigang Wang Zhanguo Liu Yaming Wang Jiahu Ouyang 

机构地区：[1]School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China [2]School of Materials and Metallurgical Engineering,Inner Mongolia University of Science&Technology,Baotou 014010,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2024年第5期1147-1165,共19页矿物冶金与材料学报（英文版）

基　　金：the financial support from the National Natural Science Foundation of China(Nos.51572061,51621091,and 51321061);the Heilongjiang Touyan Team Program。

摘　　要：The A_(2)B_(2)O_(7)-type rare earth zirconate compounds have been considered as promising candidates for thermal barrier coating(TBC) materials because of their low sintering rate,improved phase stability,and reduced thermal conductivity in contrast with the currently used yttria-partially stabilized zirconia (YSZ) in high operating temperature environments.This review summarizes the recent progress on rare earth zirconates for TBCs that insulate high-temperature gas from hot-section components in gas turbines.Based on the first principles,molecular dynamics,and new data-driven calculation approaches,doping and high-entropy strategies have now been adopted in advanced TBC materials design.In this paper,the solid-state heat transfer mechanism of TBCs is explained from two aspects,including heat conduction over the full operating temperature range and thermal radiation at medium and high temperature.This paper also provides new insights into design considerations of adaptive TBC materials,and the challenges and potential breakthroughs are further highlighted for extreme environmental applications.Strategies for improving thermophysical performance are proposed in two approaches:defect engineering and material compositing.

关 键 词：rare earth zirconates thermal barrier coatings defect engineering doping and compositing thermal conductivity thermal expansion 

分 类 号：TG178[金属学及工艺—金属表面处理] TK471[金属学及工艺—金属学]