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Low thermal conductivity, compatible thermal expansion coefficient, and good calcium- magnesium-aluminosilicate (CMAS) corrosion resistance are critical requirements of environmental barrier coatings for silicon-based ceramics. Rare earth silicates have been recognized as one of the most promising environmental barrier coating candidates for good water vapor corrosion resistance. However, the relatively high thermal conductivity and high thermal expansion coefficient limit the practical application. Inspired by the high entropy effect, a novel rare earth monosilicate solid solution (Ho0.25Lu0.25Yb0.25Eu0.25)2SiO5 was designed to improve the overall performance. The as-synthesized (Ho0.25Lu0.25Yb0.25Eu0.25)2SiO5 shows very low thermal conductivity (1.07 W·m-1·K-1 at 600 ℃). Point defects including mass mismatch and oxygen vacancies mainly contribute to the good thermal insulation properties. The thermal expansion coefficient of (Ho0.25Lu0.25Yb0.25Eu0.25)2SiO5 can be decreased to (4.0-5.9)×10-6 K-1 due to severe lattice distortion and chemical bonding variation, which matches well with that of SiC ((4.5-5.5)×10-6 K-1). In addition, (Ho0.25Lu0.25Yb0.25Eu0.25)2SiO5 presents good resistance to CMAS corrosion. The improved performance of (Ho0.25Lu0.25Yb0.25Eu0.25)2SiO5 highlights it as a promising environmental barrier coating candidate.


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(Ho0.25Lu0.25Yb0.25Eu0.25)2SiO5 high-entropy ceramic with low thermal conductivity, tunable thermal expansion coefficient, and excellent resistance to CMAS corrosion

Show Author's information Zhilin CHENaZhilin TIANa( )Liya ZHENGaKeyu MINGaXiaomin RENb,cJingyang WANGbBin LIa( )
School of Materials, Shenzhen Campus of Sun Yat-sen University, Shenzhen 518107, China
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
School of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, China

Abstract

Low thermal conductivity, compatible thermal expansion coefficient, and good calcium- magnesium-aluminosilicate (CMAS) corrosion resistance are critical requirements of environmental barrier coatings for silicon-based ceramics. Rare earth silicates have been recognized as one of the most promising environmental barrier coating candidates for good water vapor corrosion resistance. However, the relatively high thermal conductivity and high thermal expansion coefficient limit the practical application. Inspired by the high entropy effect, a novel rare earth monosilicate solid solution (Ho0.25Lu0.25Yb0.25Eu0.25)2SiO5 was designed to improve the overall performance. The as-synthesized (Ho0.25Lu0.25Yb0.25Eu0.25)2SiO5 shows very low thermal conductivity (1.07 W·m-1·K-1 at 600 ℃). Point defects including mass mismatch and oxygen vacancies mainly contribute to the good thermal insulation properties. The thermal expansion coefficient of (Ho0.25Lu0.25Yb0.25Eu0.25)2SiO5 can be decreased to (4.0-5.9)×10-6 K-1 due to severe lattice distortion and chemical bonding variation, which matches well with that of SiC ((4.5-5.5)×10-6 K-1). In addition, (Ho0.25Lu0.25Yb0.25Eu0.25)2SiO5 presents good resistance to CMAS corrosion. The improved performance of (Ho0.25Lu0.25Yb0.25Eu0.25)2SiO5 highlights it as a promising environmental barrier coating candidate.

Keywords: thermal conductivity, environmental barrier coating (EBC), thermal expansion coefficient (TEC), high-entropy ceramic, rare earth silicate

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Publication history

Received: 05 December 2021
Revised: 18 April 2022
Accepted: 01 May 2022
Published: 15 June 2022
Issue date: August 2022

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© The Author(s) 2022.

Acknowledgements

This work was financially supported by Guangdong Basic and Applied Basic Research Foundation for Distinguished Young Scholars (Grant No. 2021B1515020083), Guang Dong Basic and Applied Basic Research Foundation for Young Scholars (Grant No. 21201910240002803), Shenzhen Science and Technology Program (Grant Nos. GXWD20201231165807008, 20200831172254001), and Fundamental Research Funds for the Central Universities, Sun Yat-sen University (Grant No. 2021qntd10). The authors are grateful to Dr. Wenxia Zhao from Sun Yat-sen University Instrumental Analysis & Research Center for her kind help with EPMA analysis.

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