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Research Article | Open Access

Xenotime-type high-entropy (Dy1/7Ho1/7Er1/7Tm1/7Yb1/7Lu1/7Y1/7)PO4: A promising thermal/environmental barrier coating material for SiCf/SiC ceramic matrix composites

Peixiong Zhanga, Xingjun Duana, Xiaochang Xiea, Donghai Dingb, Tao Yanga, Xinmei Houa ( ), Yunsong Zhaoc( ), Enhui Wanga( )
Innovation Research Institute for Carbon Neutrality, University of Science and Technology Beijing, Beijing 100083, China
College of Materials Science and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China
Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095, China
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Abstract

Rare-earth phosphates (REPO4) are regarded as one of the promising thermal/environmental barrier coating (T/EBC) materials for SiCf/SiC ceramic matrix composites (SiC-CMCs) owing to their excellent resistance to water vapor and CaO–MgO–Al2O3–SiO2 (CMAS). Nevertheless, a relatively high thermal conductivity (κ) of the REPO4 becomes the bottleneck for their practical applications. In this work, novel xenotime-type high-entropy (Dy1/7Ho1/7Er1/7Tm1/7Yb1/7Lu1/7Y1/7)PO4 (HE (7RE1/7)PO4) has been designed and synthesized for the first time to solve this issue. HE (7RE1/7)PO4 with a homogeneous rare-earth element distribution exhibits high thermal stability up to 1750 ℃ and good chemical compatibility with SiO2 up to 1400 ℃. In addition, the thermal expansion coefficient (TEC) of HE (7RE1/7)PO4 (5.96×10−6 ℃−1 from room temperature (RT) to 900 ℃) is close to that of the SiC-CMCs. What is more, the thermal conductivities of HE (7RE1/7)PO4 (from 4.38 W·m−1·K−1 at 100 ℃ to 2.25 W·m−1·K−1 at 1300 ℃) are significantly decreased compared to those of single-component REPO4 with the minimum value ranging from 9.90 to 4.76 W·m−1·K−1. These results suggest that HE (7RE1/7)PO4 has the potential to be applied as the T/EBC materials for the SiC-CMCs in the future.

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high-entropy ceramics (HECs)(Dy1/7Ho1/7Er1/7Tm1/7Yb1/7Lu1/7Y1/7)PO4 ((7RE1/7)PO4)thermal/environmental barrier coatings (T/EBCs)thermal expansion coefficient (TEC)thermal conductivity (κ)

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Journal of Advanced Ceramics
Volume 12 Issue 5,
May 2023
Pages 1033-1045
DOI: 10.26599/JAC.2023.9220736

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Cite this article:
Zhang P, Duan X, Xie X, et al. Xenotime-type high-entropy (Dy1/7Ho1/7Er1/7Tm1/7Yb1/7Lu1/7Y1/7)PO4: A promising thermal/environmental barrier coating material for SiCf/SiC ceramic matrix composites. Journal of Advanced Ceramics, 2023, 12(5): 1033-1045. https://doi.org/10.26599/JAC.2023.9220736

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Received: 07 December 2022
Revised: 20 February 2023
Accepted: 26 February 2023
Published: 10 April 2023
© The Author(s) 2023.

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