Thermophysical and mechanical properties of dual-phase medium- and high-entropy rare-earth zirconate ceramics

被引：17
作者：
Fan, Wei [1 ]
Liu, Yanfen [1 ]
Lv, Zebin [1 ]
Bai, Yu [2 ]
Wang, Yu [2 ]
Liu, Kun [3 ]
Lin, Zhiye [1 ]
Ou, Jianming [1 ]
机构：
[1] North Univ China, Sch Energy & Power Engn, Taiyuan 030051, Peoples R China
[2] Xi An Jiao Tong Univ, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China
[3] Zhengzhou Univ Light Ind, Mech & Elect Engn Inst, Zhengzhou 450000, Peoples R China
来源：
CERAMICS INTERNATIONAL | 2023年 / 49卷 / 23期
基金：
中国国家自然科学基金;
关键词：
Thermal barrier coatings; High-entropy ceramics; Pyrochlore-fluorite dual -phase structure; Thermophysical and mechanical properties; LOW THERMAL-CONDUCTIVITY; FLUORITE OXIDES; DISORDER; TRANSITION;
D O I：
10.1016/j.ceramint.2023.09.129
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：
The medium-entropy ceramic (La1/3Nd1/3Gd1/3)2(Zr3/4Ce1/4)2O7 and high-entropy ceramic (La1/5Nd1/5Sm1/ 5Eu1/5Gd1/5)2(Zr3/4Ce1/4)2O7 were successfully synthesized. The two ceramics had a pyrochlore-fluorite dualphase structure, and they exhibited excellent phase stability at elevated temperature. Grain refinement or solution strengthening improved the Vickers hardness, fracture toughness and elastic modulus of the dual-phase ceramics. Compared with the single-element ceramic La2Zr2O7, multicomponent doping resulted in a significant increase in the thermal expansion coefficient. Simultaneously, the thermal conductivity of the dual-phase ceramics was lower than that of single-phase ones. In addition, on account of the large size disorder parameter of the medium-entropy ceramic, the thermal conductivity could outperform its high-entropy counterpart. These results indicate that pyrochlore-fluorite dual-phase rare-earth zirconates have enormous potential in applications concerning next generation thermal barrier coatings.
引用
收藏
页码：38000 / 38006
页数：7
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