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(La0.2Ce0.2Nd0.2Sm0.2Eu0.2)2Zr2O7:A novel high-entropy ceramic with low thermal conductivity and sluggish grain growth rate

查看全文 作　　者：Zifan [1,2]Zhao;Huimin [2]Xiang;Fu-Zhi [2]Dai;Zhijian [1]Peng;Yanchun [2]Zhou 高影响力作者 机构地区：[1]School of Engineering and Technology,China University of Geosciences,Beijing 100083,China;[2]Science and Technology on Advanced Functional Composite Laboratory,Aerospace Research Institute of Materials&Processing Technology,Beijing 100076,China高影响力机构 出　　处：《Journal of Materials Science & Technology》索引2019年第35卷第11期,共5页高影响力期刊 基　　金：financially supported by the National Natural Science Foundation of China (Nos.51672064 and U1435206) 摘　　要：Fine grains and slow grain growth rate are beneficial to preventing the thermal stress-induced cracking and thermal conductivity increase of thermal barrier coatings.Inspired by the sluggish diffusion effect of high-entropy materials,a novel high-entropy(HE)rare-earth zirconate solid solution(La0.2Ce0.2Nd0.2Sm0.2Eu0.2)2 Zr2 O7 was designed and successfully synthesized in this work.The as-synthesized(La0.2Ce0.2Nd0.2Sm0.2Eu0.2)2 Zr2 O7 is phase-pure with homogeneous rare-earth element distribution.The thermal conductivity of as-synthesized(La0.2Ce0.2Nd0.2Sm0.2Eu0.2)2 Zr2 O7 at room temperature is as low as 0.76 W m^-1 K^-1.Moreover,after being heated at 1500℃for 1-18 h,the average grain size of(La0.2Ce0.2Nd0.2Sm0.2Eu0.2)2 Zr2 O7 only increases from 1.69μm to 3.92μm,while the average grain size of La2Zr2O7 increases from 1.96μm to 8.89μm.Low thermal conductivity and sluggish grain growth rate indicate that high-entropy(La0.2Ce0.2Nd0.2Sm0.2Eu0.2)2Zr2O7 is suitable for application as a thermal barrier coating material and it may possess good thermal stress-induced cracking resistance. 关 键 词：(La0.2Ce0.2Nd0.2Sm0.2Eu0.2)2Zr2O7 High-entropy ceramics Thermal barrier coatings Slow grain growth rate
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