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Journal of Advanced Ceramics 2019, 8(4): 576-582 https://doi.org/10.1007/s40145-019-0342-4
Rapid Communication | Open Access | Issue | Published: 25 July 2019

High-entropy pyrochlores with low thermal conductivity for thermal barrier coating materials

Show Author's Information Fei LI†,  Lin ZHOU†,  Ji-Xuan LIU,  Yongcheng LIANG,  Guo-Jun ZHANG( )
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Institute of Functional Materials, College of Science, Donghua University, Shanghai 201620, China

† These authors contributed equally to this work.

Keywords:
thermal conductivity, high-entropy ceramics, pyrochlore, thermal barrier coating (TBC)
Cite this article:
LI F, ZHOU L, LIU J-X, et al. High-entropy pyrochlores with low thermal conductivity for thermal barrier coating materials. Journal of Advanced Ceramics, 2019, 8(4): 576-582. https://doi.org/10.1007/s40145-019-0342-4
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Abstract Full text Electronic supplementary material About this article

High-entropy pyrochlore-type structures based on rare-earth zirconates are successfully produced by conventional solid-state reaction method. Six rare-earth oxides (La2O3, Nd2O3, Sm2O3, Eu2O3, Gd2O3, and Y2O3) and ZrO2 are used as the raw powders. Five out of the six rare-earth oxides with equimolar ratio and ZrO2 are mixed and sintered at different temperatures for investigating the reaction process. The results demonstrate that the high-entropy pyrochlores (5RE1/5)2Zr2O7 have been formed after heated at 1000 ℃. The (5RE1/5)2Zr2O7 are highly sintering resistant and possess excellent thermal stability. The thermal conductivities of the (5RE1/5)2Zr2O7 high-entropy ceramics are below 1 W·m-1·K-1 in the temperature range of 300-1200 ℃. The (5RE1/5)2Zr2O7 can be potential thermal barrier coating materials.


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Electronic supplementary material
About this article

High-entropy pyrochlores with low thermal conductivity for thermal barrier coating materials

Show Author's information Fei LI†, Lin ZHOU†, Ji-Xuan LIU, Yongcheng LIANG, Guo-Jun ZHANG( )
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Institute of Functional Materials, College of Science, Donghua University, Shanghai 201620, China

† These authors contributed equally to this work.

Abstract

High-entropy pyrochlore-type structures based on rare-earth zirconates are successfully produced by conventional solid-state reaction method. Six rare-earth oxides (La2O3, Nd2O3, Sm2O3, Eu2O3, Gd2O3, and Y2O3) and ZrO2 are used as the raw powders. Five out of the six rare-earth oxides with equimolar ratio and ZrO2 are mixed and sintered at different temperatures for investigating the reaction process. The results demonstrate that the high-entropy pyrochlores (5RE1/5)2Zr2O7 have been formed after heated at 1000 ℃. The (5RE1/5)2Zr2O7 are highly sintering resistant and possess excellent thermal stability. The thermal conductivities of the (5RE1/5)2Zr2O7 high-entropy ceramics are below 1 W·m-1·K-1 in the temperature range of 300-1200 ℃. The (5RE1/5)2Zr2O7 can be potential thermal barrier coating materials.

Keywords: thermal conductivity, high-entropy ceramics, pyrochlore, thermal barrier coating (TBC)

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Publication history

Received: 05 June 2019
Accepted: 18 June 2019
Published: 25 July 2019
Issue date: December 2019

Copyright

© The author(s) 2019

Acknowledgements

Financial support from the National Natural Science Foundation of China (Nos. 51532009, 51602324, and 51872405) are gratefully acknowledged.

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