文献类型：期刊文献

英文题名：High-temperature thermal stability modification of (La 0.2 Y 0.2 Sm 0.2 Eu 0.2 Nd 0.2 ) 2 Zr 2 O 7 ceramic aerogel for enhanced thermal insulation performance

作者：Han, Yuqing[1];Wu, Youqing[1];Huang, Sheng[1,2];Zhang, Hong[3];Wang, Yuhao[3];Liang, Zijun[1];Guan, Xuebo[3];Wu, Shiyong[1,2]

机构：[1]East China Univ Sci & Technol, Dept Chem Engn Energy Resources, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Minist Educ, Engn Res Ctr Resource Utilizat Carbon Containing W, Shanghai 200237, Peoples R China;[3]Naicher New Mat Yingkou Co Ltd, Yingkou 115004, Peoples R China

年份：2024

卷号：50

期号：12

起止页码：22010

外文期刊名：CERAMICS INTERNATIONAL

收录：;EI(收录号：20241415840840);WOS:【SCI-EXPANDED(收录号:WOS:001239073300003)】；

基金：This study was supported by the Key Technologies Program of the Yingkou Science and Technology Bureau [Item No. 2022JH3/0200003] .

语种：英文

外文关键词：High-entropy ceramics; Aerogel; High-temperature thermal stability; Thermal conductivity

摘要：In this study, tetraethylorthosilicate and dimethyldiethoxysilane were employed to modify high-entropy (La 0.2 Y 0.2 Sm 0.2 Eu 0.2 Nd 0.2 ) 2 Zr 2 O 7 (5RE 2 Zr 2 O 7 ) ceramic aerogels to address the challenges of particle agglomeration and pore structure collapse that occur during the calcination step in the preparation of high -entropy ceramic aerogels. Following the modification, the specific surface area of the ceramic aerogel increased significantly from 32.22 m 2 /g to 148.65 m 2 /g to 201.61 m 2 /g. Simultaneously, the formation of defective fluorite or pyrochlore crystal structures led to reduced thermal conductivity in the three types of high -entropy ceramic aerogels, namely 5RE 2 Zr 2 O 7 (from 0.212 W m - 1 center dot K -1 to 0.139 W m - 1 center dot K -1 ), 5RE 2 ZSA (from 0.065 W m - 1 center dot K -1 to 0.049 W m - 1 center dot K - 1 ), and DDS/5RE 2 ZSA (from 0.046 W m - 1 center dot K -1 to 0.039 W m - 1 center dot K -1 ), compared to their respective non -high -entropy counterparts. Balancing the porous structure of high -entropy ceramic aerogels with an adequate number of defective fluorite or pyrochlore crystals is challenging. Addressing this challenge is a key direction for advancing high -entropy aerogels in the future.