High-entropy(La_(0.2)Nd_(0.2)Sm_(0.2)Gd_(0.2)Yb_(0.2))_(2)(Zr_(0.75)Ce_(0.25))_(2)O_(7)thermal barrier coating material with significantly enhanced fracture toughness  

作　　者：Donghui GUO Feifei ZHOU Baosheng XU Yiguang WANG You WANG 

机构地区：[1]Institute of Advanced Structure Technology,Beijing Institute of Technology,Beijing 100081,China [2]Department of Materials Science,School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China

出　　处：《Chinese Journal of Aeronautics》2023年第4期556-564,共9页中国航空学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.52202057);the National Science and Technology Major Project,China(2017-VI-0020-0093).

摘　　要：Poor fracture toughness leads to premature failure of La_(2)(Zr_(0.75)Ce_(0.25))_(2)O_(7)(LCZ)ther-mal barrier coatings in an elevated temperature service environment.A novel coating material,namely(La_(0.2)Nd_(0.2)Sm_(0.2)Gd_(0.2)Yb_(0.2))_(2)(Zr_(0.75)Ce_(0.25))_(2)O_(7)(LNSGY)based on the high-entropy con-cept,was successfully fabricated by solid-state sintering.The microstructure of LCZ and LNSGY was investigated by X-Ray Diffraction(XRD),Raman Spectrometer(RS),Transmission Electronic Microscopy(TEM)and Scanning Electron Microscopy(SEM).The fracture toughness of the LCZ and LNSGY ceramics was evaluated.The LNSGY has excellent high-temperature phase stability,and the grain size of LNSGY ceramic is smaller than that of LCZ ceramic at an elevated temper-ature due to the sluggish diffusion effect.Compared with LCZ(fracture toughness is(1.4±0.1)MPa·m^(1/2)),the fracture toughness of LNSGY is significantly enhanced(fracture toughness is(2.0±0.3)MPa·m^(1/2)).Therefore,the LNSGY can be a promising advanced thermal barrier coat-ing material in the future.

关 键 词：Fracture toughness High-entropy ceramics High-temperature phase sta-bility Rare-earth zirconate Thermal barrier coatings 

分 类 号：V232[航空宇航科学与技术—航空宇航推进理论与工程]