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Rapid Communication | Open Access

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

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.

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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 barrier coating (TBC)pyrochlorehigh-entropy ceramicsthermal conductivity

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Journal of Advanced Ceramics
Volume 8 Issue 4,
December 2019
Pages 576-582
DOI: 10.1007/s40145-019-0342-4
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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Received: 05 June 2019
Accepted: 18 June 2019
Published: 25 July 2019
© The author(s) 2019

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