Ultrafast densification of high-entropy oxide (La0.2Nd0.2Sm0.2Eu0.2Gd0.2)2Zr2O7 by reactive flash sintering

被引：60
作者：
Mao, Hai-Rong [1 ]
Guo, Rui-Fen [1 ]
Cao, Yue [1 ]
Jin, Shen-Bao [2 ]
Qiu, Xiao-Ming [1 ]
Shen, Ping [1 ]
机构：
[1] Jilin Univ, Sch Mat Sci & Engn, Minist Educ, Key Lab Automobile Mat, 5988 Renmin St, Changchun 130022, Peoples R China
[2] Nanjing Univ Sci & Technol, Sch Mat Sci & Engn, Herbert Gleiter Inst Nanosci, Nanjing 210094, Peoples R China
来源：
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2021年 / 41卷 / 04期
基金：
中国国家自然科学基金;
关键词：
High-entropy pyrochlore oxide (HEPO); Reactive flash sintering (RFS); Mechanical property;
D O I：
10.1016/j.jeurceramsoc.2020.11.052
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：
Pyrochlore-type high-entropy oxides (HEOs) are usually sintered at high temperatures for a long time to achieve full density. Herein, we synthesized pyrochlore-structured (La0.2Nd0.2Sm0.2Eu0.2Gd0.2)(2)Zr2O7 HEOs with densities up to 99 % at a furnace temperature of 1200 degrees C in seconds via reactive flash sintering (RFS). The resultant HEOs achieved compositional uniformity at the atomic level and exhibited superior modulus, hardness and fracture toughness compared to the counterparts prepared by conventional solid-state sintering (at 1600 degrees C for 6 h). The underlying mechanisms for the ultrafast densification of the RFSed-HEOs were addressed in view of the roles of electric field, rapid heating, external pressure and internal reactions.
引用
收藏
页码：2855 / 2860
页数：6
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