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 Zhang; Xingjun Duan; Xiaochang Xie; Donghai Ding; Tao Yang; Xinmei Hou; Yunsong Zhao; Enhui Wang

doi:10.26599/JAC.2023.9220736

Journal of Advanced Ceramics (May 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

Peixiong Zhang,
Xingjun Duan,
Xiaochang Xie,
Donghai Ding,
Tao Yang,
Xinmei Hou,
Yunsong Zhao,
Enhui Wang

Affiliations

Peixiong Zhang: Innovation Research Institute for Carbon Neutrality, University of Science and Technology Beijing, Beijing 100083, China
Xingjun Duan: Innovation Research Institute for Carbon Neutrality, University of Science and Technology Beijing, Beijing 100083, China
Xiaochang Xie: Innovation Research Institute for Carbon Neutrality, University of Science and Technology Beijing, Beijing 100083, China
Donghai Ding: College of Materials Science and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China
Tao Yang: Innovation Research Institute for Carbon Neutrality, University of Science and Technology Beijing, Beijing 100083, China
Xinmei Hou: Innovation Research Institute for Carbon Neutrality, University of Science and Technology Beijing, Beijing 100083, China
Yunsong Zhao: Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095, China
Enhui Wang: Innovation Research Institute for Carbon Neutrality, University of Science and Technology Beijing, Beijing 100083, China

DOI: https://doi.org/10.26599/JAC.2023.9220736
Journal volume & issue: Vol. 12, no. 5
pp. 1033 – 1045

Abstract

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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.

Published in Journal of Advanced Ceramics

ISSN: 2226-4108 (Print); 2227-8508 (Online)
Publisher: Tsinghua University Press
Country of publisher: China
LCC subjects: Technology: Chemical technology: Clay industries. Ceramics. Glass
Website: https://www.sciopen.com/journal/2226-4108

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