High entropy defective fluorite structured rare-earth niobates and tantalates for thermal barrier applications

查看全文 作　　者：Zifan [1,2]ZHAO;Heng [1]CHEN;Huimin [1]XIANG;Fu-Zhi [1]DAI;Xiaohui [3]WANG;Wei [4]XU;Kuang [4]SUN;Zhjjian [2]PENG;Yanchun [1]ZHOU

机构地区：[1]Science and Technology on Advanced Functional Composite Laboratory,Aerospace Research Institute of Materials&Processing Technology,Beijing 100076,China;[2]School of Engineering and Technology,China University of Geosciences,Bejing 100083,China;[3]Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;[4]Shanghai Chenhua Science and Technology Corporation Ltd.,Shanghai 201804,China

出　　处：《Journal of Advanced Ceramics》索引2020年第9卷第3期,共9页

基　　金：This study was financially supported by the National Natural Science Foundation of China(Nos.51672064 and 51972089). 摘　　要：Rare-earth tantalates and niobates(REjTaO7 and REjNbO7)have been considered as promising candidate thermal barrier coating(TBC)materials in next generation gas-turbine engines due to their ultra-low thermal conductivity and better thermal stability than yttria-stabilized zirconia(YSZ).However,the low Vickers hardness and toughness are the main shortcomings of RE;TaO-and REjNbOr that limit their applications as TBC materials.To increase the hardness,high entropy(Yu3Ybu3Er/3)sTaOr,(Y13YbnErns)NbO,and(Sm1/6Eu1/6Y 1/6Yb1/6Lu1/6Er1/6)3(Nb1/2Ta1/2)O7 are designed and synthesized in this study.These high entropy ceramics exhibit high Vickers hardness(10.912.0 GPa),close thermal expansion coefficients to that of single-principal-component RE3TaO,and RE;NbO,(7.9×10^-6-10.8×10-6 C-1 at room temperature),good phase stability,and good chemical compatibility with thermally grown Al2O3,which make them promising for applications as candidate TBC materials. 关键词：high entropy ceramics defective fluorite structure rare-earth niobates/tantalates thermal barrier coating material

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High entropy defective fluorite structured rare-earth niobates and tantalates for thermal barrier applications

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