Multi-component strategy for remarkable suppression of thermal conductivity in strontium diyttrium oxide: The case of high-entropy Sr (Y0.2Sm0.2Gd0.2Dy0.2Yb0.2)2O4 ceramic

被引：11

作者：

Luo, Xuewei ^{[1
]}

Li, Hantao ^{[1
]}

Huang, Shuo ^{[1
]}

Li, Kaiyun ^{[1
]}

Li, Jianping ^{[2
]}

Yang, Xiuen ^{[2
]}

Xu, Chunhui ^{[3
]}

Hou, Shuen ^{[1
]}

Jin, Hongyun ^{[1
]}

机构：

[1] China Univ Geosci, Fac Mat Sci & Chem, Engn Res Ctr Nanogeomaterials, Minist Educ, Wuhan 430074, Peoples R China

[2] Chengdu Holy Ind & Commerce Corp Ltd Grp, Chengdu 611937, Peoples R China

[3] Guiyang AECC Power Precis Casting Co Ltd, Guiyang 550000, Peoples R China

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2023年 / 43卷 / 12期

关键词：

High-entropy ceramics; SrY2O4; Reduced thermal conductivity; Thermal barrier coatings; BARRIER COATINGS; STABILITY; TEMPERATURE; CE;

D O I：

10.1016/j.jeurceramsoc.2023.04.040

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：

Anti-spinel oxide SrY2O4 has attracted extensive attention as a promising host lattice due to its outstanding high-temperature structural stability and large thermal expansion coefficient (TEC). However, the overhigh thermal conductivity limits its application in the field of thermal barrier coatings. To address this issue, a novel highentropy Sr(Y0.2Sm0.2Gd0.2Dy0.2Yb0.2)(2)O-4 ceramic was designed and synthesized for the first time via the solid-state method. It is found that the thermal conductivity of Sr(Y0.2Sm0.2Gd0.2Dy0.2Yb0.2)(2)O-4 is reduced to 1.61 W center dot m(-1)center dot K-1, 53 % lower than that of SrY2O4 (3.44 W center dot m(-1)center dot K-1) at 1500 degrees C. Furthermore, reasonable TEC (11.53 x10(-6) K-1, 25 degrees C similar to 1500 degrees C), excellent phase stability, and improved fracture toughness (1.92 +/- 0.04 MPa center dot m1/ 2) remained for the high-entropy Sr(Y0.2Sm0.2Gd0.2Dy0.2Yb0.2)(2)O-4 ceramic, making it a promising material for next-generation thermal barrier coatings.

引用

页码：5339 / 5346

页数：8

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