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Journal of Advanced Ceramics 2023, 12(4): 861-872 https://doi.org/10.26599/JAC.2023.9220726
Research Article | Open Access | Issue | Published: 14 March 2023

Synergistic effects of high-entropy engineering and particulate toughening on the properties of rare-earth aluminate-based ceramic composites

Show Author's Information Tian-Zhe Tu,  Ji-Xuan Liu( ),  Yue Wu,  Lin Zhou,  Yongcheng Liang,  Guo-Jun Zhang( )
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, College of Science, Institute of Functional Materials, Donghua University, Shanghai 201620, China
Keywords:
mechanical properties, thermal properties, thermal barrier coating (TBC), high-entropy particulate composites, fine grains
Cite this article:
Tu T-Z, Liu J-X, Wu Y, et al. Synergistic effects of high-entropy engineering and particulate toughening on the properties of rare-earth aluminate-based ceramic composites. Journal of Advanced Ceramics, 2023, 12(4): 861-872. https://doi.org/10.26599/JAC.2023.9220726
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Abstract Full text About this article

Rare-earth aluminates (REAlO3) are potential thermal barrier coating (TBC) materials, but the relatively high thermal conductivity (k0, ~13.6 W·m−1·K−1) and low fracture toughness (KIC, ~1.9 MPa·m1/2) limit their application. This work proposed a strategy to improve their properties through the synergistic effects of high-entropy engineering and particulate toughening. High-entropy (La0.2Nd0.2Sm0.2Eu0.2Gd0.2)AlO3 (HEAO)-based particulate composites with different contents of high-entropy (La0.2Nd0.2Sm0.2Eu0.2Gd0.2)2Zr2O7 (HEZO) were designed and successfully prepared by solid-state sintering. The high-entropy feature of both the matrix and secondary phases causes the strong phonon scattering and the incorporation of the HEZO secondary phase, remarkedly inhibiting the grain growth of the HEAO phase. As a result, HEAO–xHEZO (x = 0, 5%, 10%, 25%, and 50% in volume) ceramic composites show low thermal conductivity and high fracture toughness. Compared to the most commonly applied TBC material—yttria stabilized-zirconia (YSZ), the HEAO–25%HEZO particulate composite has a lower thermal conductivity of 0.96–1.17 W·m−1·K−1 (298–1273 K), enhanced fracture toughness of 3.94±0.35 MPa·m1/2, and comparable linear coefficient of thermal expansion (CTE) of 10.5×10−6 K−1. It is believed that the proposed strategy should be revelatory for the design of new coating materials including TBCs and environmental barrier coatings (EBCs).


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About this article

Synergistic effects of high-entropy engineering and particulate toughening on the properties of rare-earth aluminate-based ceramic composites

Show Author's information Tian-Zhe Tu, Ji-Xuan Liu( ), Yue Wu, Lin Zhou, Yongcheng Liang, Guo-Jun Zhang( )
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, College of Science, Institute of Functional Materials, Donghua University, Shanghai 201620, China

Abstract

Rare-earth aluminates (REAlO3) are potential thermal barrier coating (TBC) materials, but the relatively high thermal conductivity (k0, ~13.6 W·m−1·K−1) and low fracture toughness (KIC, ~1.9 MPa·m1/2) limit their application. This work proposed a strategy to improve their properties through the synergistic effects of high-entropy engineering and particulate toughening. High-entropy (La0.2Nd0.2Sm0.2Eu0.2Gd0.2)AlO3 (HEAO)-based particulate composites with different contents of high-entropy (La0.2Nd0.2Sm0.2Eu0.2Gd0.2)2Zr2O7 (HEZO) were designed and successfully prepared by solid-state sintering. The high-entropy feature of both the matrix and secondary phases causes the strong phonon scattering and the incorporation of the HEZO secondary phase, remarkedly inhibiting the grain growth of the HEAO phase. As a result, HEAO–xHEZO (x = 0, 5%, 10%, 25%, and 50% in volume) ceramic composites show low thermal conductivity and high fracture toughness. Compared to the most commonly applied TBC material—yttria stabilized-zirconia (YSZ), the HEAO–25%HEZO particulate composite has a lower thermal conductivity of 0.96–1.17 W·m−1·K−1 (298–1273 K), enhanced fracture toughness of 3.94±0.35 MPa·m1/2, and comparable linear coefficient of thermal expansion (CTE) of 10.5×10−6 K−1. It is believed that the proposed strategy should be revelatory for the design of new coating materials including TBCs and environmental barrier coatings (EBCs).

Keywords: mechanical properties, thermal properties, thermal barrier coating (TBC), high-entropy particulate composites, fine grains

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Publication history

Received: 28 November 2022
Revised: 20 January 2023
Accepted: 27 January 2023
Published: 14 March 2023
Issue date: April 2023

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© The Author(s) 2023.

Acknowledgements

We acknowledge the financial supports from the National Natural Science Foundation of China (Nos. 52032001 and 52211540004) and the Fundamental Research Funds for the Central Universities (No. 2232021A-01).

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