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Journal of Advanced Ceramics 2023, 12(5): 1033-1045 https://doi.org/10.26599/JAC.2023.9220736
Research Article | Open Access | Issue | Published: 10 April 2023

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

Show Author's Information 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
Keywords:
high-entropy ceramics (HECs), thermal expansion coefficient (TEC), (Dy1/7Ho1/7Er1/7Tm1/7Yb1/7Lu1/7Y1/7)PO4 ((7RE1/7)PO4), thermal/environmental barrier coatings (T/EBCs), thermal conductivity (κ)
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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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Abstract Full text Electronic supplementary material About this article

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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About this article

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

Show Author's information 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

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.

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

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Publication history

Received: 07 December 2022
Revised: 20 February 2023
Accepted: 26 February 2023
Published: 10 April 2023
Issue date: May 2023

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© The Author(s) 2023.

Acknowledgements

This work was supported by the National Key R&D Program of China (No. 2021YFB3701404), the National Science Fund for Distinguished Young Scholars (No. 52025041), and the National Natural Science Foundation of China (Nos. 51904021 and 52174294).

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