High-entropy fluorite oxides: Atomic stabiliser effects on thermal-mechanical properties

被引：27

作者：

Li Liew, Siao ^{[1
]}

Ni, Xi Ping ^{[1
]}

Wei, Fengxia ^{[1
]}

Tan, Sze Yu ^{[1
]}

Luai, Meng Tzee ^{[1
]}

Lim, Poh Chong ^{[1
]}

Teo, Siew Lang ^{[1
]}

Rafiq, Nafisah Bte Mohd ^{[1
]}

Zhou, Jun ^{[1
]}

Wang, Shijie ^{[1
]}

机构：

[1] Inst Mat Res & Engn, ASTAR Agcy Sci Technol & Res, 2 Fusionopolis Way,Innovis, Singapore 138634, Singapore

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2022年 / 42卷 / 14期

关键词：

High-entropy fluorite oxides; Thermal Barrier Coating; Co-stabiliser; Coefficients of thermal expansion; Thermal conductivity; BARRIER COATINGS; CONDUCTIVITY; CERAMICS; DISORDER;

D O I：

10.1016/j.jeurceramsoc.2022.07.026

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：

High-entropy oxides Hf0.25Zr0.25Ce0.25Gd0.125X0.125O2-delta (X = Ca, Ti or Si) have been fabricated via solid-state reactions, in which the co-stabiliser X was intentionally chosen for its significant atomic mass and size differ-ence from Gd. The single phase of these cubic fluorite oxides with dense microstructures has been confirmed by XRD, EDS and TEM characterizations. These phases are thermally stable without the appearance of secondary phase and phase separation within the temperature range studied (up to 1200 C). Compared to yttria-stabilised zirconia (YSZ), which is used in the current commercial thermal barrier coatings, these fluorite oxides have higher coefficients of thermal expansion and lower thermal conductivities. They also exhibit comparable Young's modulus and hardness with other reported high-entropy fluorite oxides. The fluorite oxides reported in this study are promising to improve the thermal expansion matching between ceramic topcoat and metal substrates for thermal barrier coating applications.

引用

页码：6608 / 6613

页数：6

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