High-entropy rare-earth disilicate (Lu0.2Yb0.2Er0.2Tm0.2Sc0.2)2Si2O7: A potential environmental barrier coating material

被引：47
作者：
Guo, Xiaotong [1 ]
Zhang, Yulei [1 ]
Li, Tao [1 ]
Zhang, Pengfei [1 ]
Shuai, Kang [1 ]
Li, Jie [1 ]
Shi, Xiaohong [1 ]
机构：
[1] Northwestern Polytech Univ, Carbon Carbon Composites Res Ctr, Shaanxi Key Lab Fiber Reinforced Light Weight Com, Xian 710072, Peoples R China
来源：
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2022年 / 42卷 / 08期
基金：
中国国家自然科学基金;
关键词：
High-entropy rare-earth disilicates; Environmental barrier coating; Water vapor corrosion resistance; Thermophysical properties; THERMAL-PROPERTIES; SILICATE; POLYMORPHISM; PERFORMANCE; COMPOSITES; RESISTANCE; STABILITY; OXIDATION; CORROSION; MULLITE;
D O I：
10.1016/j.jeurceramsoc.2022.03.006
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：
A new high-entropy ceramic (Lu0.2Yb0.2Er0.2Tm0.2Sc0.2)2Si(2)O(7) ((5RE(0.2))(2)Si2O7) was proposed as a potential environmental barrier coating (EBC) material for ceramics matrix composites in this work. Experimental results showed that the (5RE(0.2))(2)Si2O7 synthesized by solid-phase sintering was a monoclinic solid solution and had good phase stability proved by no obvious absorption/exothermic peak in the DSC curve from room temperature to 1400 & DEG;C. It performed a lower coefficient of thermal expansion (2.08 x10(-6)-4.03 x10(-6) & DEG;C-1) and thermal conductivity (1.76-2.99 Wem(-1)e & DEG;C-1) compared with the five single principal RE2Si2O7. In water vapor corrosion tests, (5RE(0.2))(2)Si2O7 also exhibited better water vapor corrosion resistance attributed to the multiple doping effects. The weight loss was only 3.1831 x 10(-5) gecm(-2) after 200 h corrosion at 1500 & DEG;C, which was lower than that of each single principal RE2Si2O7. Therefore, (5RE(0.2))(2)Si2O7 could be regarded as a remarkable candidate for EBCs.
引用
收藏
页码：3570 / 3578
页数：9
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