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Journal of Advanced Ceramics https://doi.org/10.26599/JAC.2023.9220736
Research Article | Open Access | Just accepted | Available online: 27 February 2023

Xenotime-type high entropy (Dy1/7Ho1/7Er1/7Tm1/7Yb1/7Lu1/7 Y1/7)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( )

a Innovation Research Institute for Carbon Neutrality, University of Science and Technology Beijing, Beijing 100083, China

b College of Materials Science and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China

c Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials, Beijing, 100095, China

Keywords:
High-entropy ceramics, (Dy1/7Ho1/7Er1/7Tm1/7Yb1/7Lu1/7Y1/7)PO4, Thermal/ environmental barrier coatings, Thermal expansion coefficient, Thermal conductivity
Cite this article:
Zhang P, Duan X, Xie X, et al. Xenotime-type high entropy (Dy1/7Ho1/7Er1/7Tm1/7Yb1/7Lu1/7 Y1/7)PO4: A promising thermal/environmental barrier coating material for SiCf/SiC ceramic matrix composites. Journal of Advanced Ceramics, 2023, https://doi.org/10.26599/JAC.2023.9220736
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Abstract 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, relatively high thermal conductivity of REPO4 becomes the bottleneck for their practical application. In this work, novel xenotime‑type high entropy (Dy1/7Ho1/7 Er1/7Tm1/7Yb1/7Lu1/7Y1/7)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 °C and good chemical compatibility with SiO2 up to 1400 °C. In addition, the thermal expansion coefficient (TEC) of HE (7RE1/7)PO4 (5.96 × 10-6/°C at room temperature to 900 °C) is close to that of SiC-CMCs. What’s more, the thermal conductivity of HE (7RE1/7)PO4 (from 4.38 W·m-1 K-1 at 100 °C to 2.25 W·m-1 K-1 at 1300 °C) is 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 T/EBC material for SiC-CMCs in the future.

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Publication history

Received: 07 December 2022
Revised: 20 February 2023
Accepted: 26 February 2023
Available online: 27 February 2023

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© The Author(s) 2023.

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