| Reactive spark plasma sintering of a dual-phase high-entropy (La0.2Gd0.2Sm0.2Er0.2Yb0.2)2Zr2O7 ceramic for thermal barrier coatings |
| Jiahang Liu1, Yan Li1, Zhe Lu1, Jun-Seob Lee2, Yeon-Gil Jung2, Heekyu Choi3, Yanwen Zhou1, Hao Chen4 |
1School of Materials and Metallurgical Engineering, University of Science and Technology Liaoning, Anshan, 114051, China
2School of Materials Science and Engineering, Changwon National University, Changwon, Gyeongnam, 641 773, Republic of Korea
3Department of Mechatronics Convergence, College of Engineering, Changwon National University, Changwon, Gyeongnam, 641 773, Republic of Korea
4Shandong Nuclear Power Equipment Manufacturing Co., Ltd, Haiyang, 265100, China |
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Received: December 3, 2024; Revised: April 6, 2025 Accepted: May 4, 2025. Published online: May 22, 2025. |
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| ABSTRACT |
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Dual-phase high-entropy rare-earth zirconates (Re2Zr2O7) have become a research hotspot for thermal barrier coating ceramic materials due to their excellent properties. Currently, the research on dual-phase high-entropy Re2Zr2O7 is mainly realized by the conventional solid-state method for the synthesis of ceramics. In contrast, little research has been reported on the rapid synthesis of dual-phase high-entropy Re2Zr2O7 using spark plasma sintering. Therefore, a dual-phase high-entropy (La0.2Gd0.2Sm0.2Er0.2Yb0.2)2Zr2O7 (LGSEY) ceramic was synthesized by reactive spark plasma sintering (RSPS) at 1600 °C for 10 min. Structural analysis showed that LGSEY consisted of both pyrochlore and fluorite structures, and the rare-earth cations were uniformly distributed within the ceramics without segregation, indicating that RSPS could optimize the synthesis of dual-phase high-entropy rare-earth zirconates. Compared with Gd2Zr2O7 and La2Zr2O7, LGSEY exhibited excellent mechanical and thermal properties, including higher hardness, fracture toughness, glass-like thermal conductivity, and higher thermal expansion coefficient, suggesting that LGSEY is a promising candidate for application as a new thermal barrier coating material. |
| Key words:
Spark plasma sintering · High-entropy ceramic · Mechanical properties · Thermal properties |
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