Effect of microstructure evolution and crystal structure on thermal properties for plasma-sprayed RE_(2)SiO_(5)(RE=Gd,Y,Er)environmental barrier coatings

作     者：Xin Zhong Tao Zhu Yaran Niu Haijun Zhou Le Zhang Xiangyu Zhang Qilian Li Xuebin Zheng Xin Zhong;Tao Zhu;Yaran Niu;Haijun Zhou;Le Zhang;Xiangyu Zhang;Qilian Li;Xuebin Zheng

作者机构：Key Laboratory of Inorganic Coating Materials CASShanghai Institute of CeramicsChinese Academy of SciencesShanghai200050China Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of SciencesBeijing100049China Structural Ceramics and Composites Engineering Research CenterShanghai Institute of CeramicsChinese Academy of SciencesShanghai200050China Avic Manufacturing Technology InstituteBeijing100024China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2021年第85卷第26期

页      面：141-151页

核心收录：

学科分类：080503[工学-材料加工工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：financially supported by the National Key R&D Program of China(No.2018YFB0704400) the National Science and Technology Major Project(No.2017-VI-0020-0092) the Shanghai Technical Platform for Testing on Inorganic Materials(No.19DZ2290700) the Shanghai Sailing Program(No.19YF1453900) the Natural Science Foundation of Shanghai(No.20ZR1465700) 

主　　题：Rare-earth monosilicates Environmental barrier coating Microstructure evolution Thermal properties Crystal structure 

摘      要：In this work,the microstructure evolution,thermal expansion,thermal conductivity,and thermal shock resistance properties of the plasma-sprayed Xl-Gd_(2)SiO_(5),X2-Y_(2)SiO_(5),and X2-Er_(2)SiO_(5)coatings were evaluated and compared by experimental measurement and theoretical *** showed that significant microstructure evolution such as crystallization of amorphous phase,grain growth,and defects reduction was observed in the RE_(2)SiO_(5)coatings after thermal aging at 1400℃.The Xl-Gd_(2)SiO_(5)coating exhibited higher CTE values than the X2-Y_(2)SiO_(5)and X2-Er_(2)SiO_(5)coatings,which was related to their crystal *** thermal conductivity of thermal-aged RE_(2)SiO_(5)coating was much higher than that of the as-sprayed RE_(2)SiO_(5)coating,and thermal conductivity was determined not only by crystal structure but also mainly by the microstructure of the *** X2-Y_(2)SiO_(5)and X2-Er_(2)SiO_(5)coatings with lower thermal mismatch stre s ses presented much better thermal shock resistance than the X1-Gd_(2)SiO_(5)coating.