(Ti0.2V0.2Cr0.2Nb0.2Ta0.2)2AlC-(Ti0.2V0.2Cr0.2Nb0.2Ta0.2)C high-entropy ceramics with low thermal conductivity

被引：26
作者：
Liu, Chao [1 ,2 ]
Yang, Yue-yang [1 ]
Zhou, Zhi-fang [1 ]
Nan, Ce-wen [1 ]
Lin, Yuan-hua [1 ]
机构：
[1] Tsinghua Univ, Sch Mat Sci & Engn, State Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R China
[2] Cent South Univ, Natl Key Lab Sci & Technol Natl Def High Strength, Changsha, Peoples R China
来源：
JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 2022年 / 105卷 / 04期
基金：
中国国家自然科学基金;
关键词：
electrical conductivity; high-entropy ceramics; MAX phases; microstructure; spark plasma sintering; thermal conductivity; AL-C; PHASES; TI2ALC; TI; OPPORTUNITIES; EXPLORATION; STRATEGIES; MECHANISM; TI3ALC2; (TI;
D O I：
10.1111/jace.18252
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
In recent years, the microstructure and physicochemical properties of high-entropy ceramics have received much interest by the combination of multiple principal elements. Herein, (Ti0.2V0.2Cr0.2Nb0.2Ta0.2)(2)AlC-(Ti0.2V0.2Cr0.2Nb0.2Ta0.2)C high-entropy ceramics (M2AlC-MC HECs) were prepared by the spark plasma sintering (SPS) technique, attributing to the structural and chemical diversity of MAX phases. The microstructure of M2AlC-MC HECs was characterized from micron to atomic scales, and the phase composition of M2AlC-MC HECs was analyzed by a combination of Maud and Rietveld analysis. The results indicate the successful solid solution of Ti, V, Cr, Nb, and Ta atoms in the M-site of the 211-MAX configuration, and all the samples show a classic layered structure. The weight percentage of (Ti0.2V0.2Cr0.2Nb0.2Ta0.2)(2)AlC in the M2AlC-MC HECs was more than 90%. Furthermore, the thermoelectric properties of M2AlC-MC HECs were investigated for the first time in this study, and the electrical conductivity and thermal conductivity of HECs are 3278 S cm(-1) and 2.78 W m(-1) K(-1)at 298 K, respectively.
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页码：2764 / 2771
页数：8
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