Porous high-entropy rare-earth phosphate (REPO<sub>4</sub>, RE = La, Sm, Eu, Ce, Pr and Gd) ceramics with excellent thermal insulation performance via pore structure tailoring

Peixiong Zhang; Enhui Wang; Jingjing Liu; Tao Yang; Hailong Wang; Xinmei Hou

doi:10.1007/s12613-023-2788-1

Volume 31 Issue 7

Jul. 2024

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2024 > 31(7): 1651-1658

Peixiong Zhang, Enhui Wang, Jingjing Liu, Tao Yang, Hailong Wang, and Xinmei Hou, Porous high-entropy rare-earth phosphate (REPO₄, RE = La, Sm, Eu, Ce, Pr and Gd) ceramics with excellent thermal insulation performance via pore structure tailoring, Int. J. Miner. Metall. Mater., 31(2024), No. 7, pp. 1651-1658. https://doi.org/10.1007/s12613-023-2788-1

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Peixiong Zhang, Enhui Wang, Jingjing Liu, Tao Yang, Hailong Wang, and Xinmei Hou, Porous high-entropy rare-earth phosphate (REPO4, RE = La, Sm, Eu, Ce, Pr and Gd) ceramics with excellent thermal insulation performance via pore structure tailoring, Int. J. Miner. Metall. Mater., 31(2024), No. 7, pp. 1651-1658. https://doi.org/10.1007/s12613-023-2788-1

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Research Article

Porous high-entropy rare-earth phosphate (REPO₄, RE = La, Sm, Eu, Ce, Pr and Gd) ceramics with excellent thermal insulation performance via pore structure tailoring

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Corresponding authors:
Enhui Wang E-mail: wangenhui@ustb.edu.cn

Xinmei Hou E-mail: houxinmeiustb@ustb.edu.cn
Received: 31 July 2023; Revised: 30 October 2023; Accepted: 17 November 2023; Available online: 21 November 2023

Abstract

Abstract

Thermal insulation materials play an increasingly important role in protecting mechanical parts functioning at high temperatures. In this study, a new porous high-entropy (La_1/6Ce_1/6Pr_1/6Sm_1/6Eu_1/6Gd_1/6)PO₄ (HE (6RE_1/6)PO₄) ceramics was prepared by combining the high-entropy method with the pore-forming agent method and the effect of different starch contents (0–60vol%) on this ceramic properties was systematically investigated. The results show that the porous HE (6RE_1/6)PO₄ ceramics with 60vol% starch exhibit the lowest thermal conductivity of 0.061 W·m⁻¹·K⁻¹ at room temperature and good pore structure stability with a linear shrinkage of approximately 1.67%. Moreover, the effect of large regular spherical pores (>10 μm) on its thermal insulation performance was discussed, and an optimal thermal conductivity prediction model was screened. The superior properties of the prepared porous HE (6RE_1/6)PO₄ ceramics allow them to be promising insulation materials in the future.

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