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Research Article | Open Access

High-entropy rare-earth zirconate ceramics with low thermal conductivity for advanced thermal-barrier coatings

Debao LIUa, Baolu SHIa, Liyan GENGb, Yiguang WANGa, Baosheng XUa( ), Yanfei CHENa
Institute of Advanced Structure Technology, Beijing Institute of Technology, Beijing 100081, China
Shanghai Space Propulsion Technology Research Institute, Shanghai 201109, China
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Graphical Abstract

Abstract

The high-entropy rare-earth zirconate ((La0.2Nd0.2Sm0.2Gd0.2Yb0.2)2Zr2O7, 5RE2Zr2O7 HE- REZs) ceramics were successfully prepared by a new high-speed positive grinding strategy combined with solid-state reaction method. The microstructure, crystal structure, phase composition, and thermophysical and mechanical properties of the samples were systematically investigated through various methods. Results indicate that the samples have a single-phase defect fluorite-type crystal structure with excellent high-temperature thermal stability. The as-prepared samples also demonstrate low thermal conductivity (0.9-1.72 W·m-1·K-1 at 273-1273 K) and high coefficient of thermal expansion (CTE, 10.9 × 10-6 K-1 at 1273 K), as well as outstanding mechanical properties including large Young’s modulus (E = 186-257 GPa) and high fracture toughness (KIC). Furthermore, the formation possibility of the as-prepared samples was verified through the first-principles calculations, which suggested the feasibility to form the 5RE2Zr2O7 HE-REZs in the thermodynamic direction. Therefore, in view of the excellent multifunctional properties exhibited by the as-prepared 5RE2Zr2O7 HE-REZs, they have great potential applications in next-generation thermal-barrier coatings (TBCs).

Keywords

high-entropy rare-earth zirconates (HE-REZs)first-principles calculationsthermal conductivitythermal stabilityYoung’s modulusthermal-barrier coatings (TBCs)

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Journal of Advanced Ceramics
Volume 11 Issue 6,
June 2022
Pages 961-973
DOI: 10.1007/s40145-022-0589-z
Cite this article:
LIU D, SHI B, GENG L, et al. High-entropy rare-earth zirconate ceramics with low thermal conductivity for advanced thermal-barrier coatings. Journal of Advanced Ceramics, 2022, 11(6): 961-973. https://doi.org/10.1007/s40145-022-0589-z

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Received: 21 November 2021
Revised: 16 March 2022
Accepted: 19 March 2022
Published: 11 May 2022
© The Author(s) 2022.

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