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(Gd1/7Dy1/7Ho1/7Er1/7Tm1/7Yb1/7Lu1/7)2Si2O7 high-entropy disilicate: A promising environmental barrier coating material

(Gd1/7Dy1/7Ho1/7Er1/7Tm1/7Yb1/7Lu1/7)2Si2O7高熵稀土 双硅酸盐: 一种极具应用潜力的环境障涂层材料

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Abstract

The unique combination of a series of thermal properties and water-oxygen corrosion resistance is crucial for high-entropy disilicates serving as environmental barrier coating materials. Here, we report a novel (Gd1/7Dy1/7Ho1/7Er1/7Tm1/7Yb1/7Lu1/7)2Si2O7 high-entropy disilicate (7HERED) that simultaneously possesses excellent match of coefficient of thermal expansion with SiCf/SiC composites across 473–1973 K, ultralow thermal conductivity (1.5 Wm−1 K−1 at 1273 K), superior high-temperature stability up to 1973 K, and water-oxygen corrosion resistance at 1673 K. Such superior properties are attributed to the high-entropy and lattice-distortion effects. Our 7HERED shows great potential as a next-generation environmental barrier coating material.

摘要

作为一种潜在的环境障涂层材料, 高熵稀土双硅酸盐的热物理 化学性质至关重要. 本文报道了一种新型(Gd1/7Dy1/7Ho1/7Er1/7Tm1/7-Yb1/7Lu1/7)2Si2O7高熵稀土双硅酸盐(7HERED), 它兼具与SiCf/SiC复合 材料良好的热膨胀系数匹配性、超低的热导率( 1 2 7 3 K时为 1.5 Wm−1 K−1)、高达1973 K的高温稳定性以及在1673 K下优异的耐水 氧腐蚀性等优异的综合性能. 这种优异的综合性能可归因于7HERED 的高熵效应和晶格畸变效应. 本文所开发的7HERED有望作为下一代 环境障涂层材料.

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Acknowledgements

This work was supported by the National Key Research and Development Program of China (2022YFB3708600) and the National Natural Science Foundation of China (52122204).

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Authors and Affiliations

  1. School of Materials Science and Engineering, South China University of Technology, Guangzhou, 510641, China

    Yang Liu  (刘洋), Lei Zhuang  (庄磊), **bo **e  (谢**波), Hulei Yu  (俞呼雷) & Yanhui Chu  (褚衍辉)

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  1. Yang Liu  (刘洋)
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  2. Lei Zhuang  (庄磊)
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  3. **bo **e  (谢**波)
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  4. Hulei Yu  (俞呼雷)
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  5. Yanhui Chu  (褚衍辉)
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Contributions

Author contributions Chu Y conceived and designed this work. Liu Y and **e P performed the experiments. Chu Y, Liu Y, **e P and Zhuang L analyzed the data and wrote the manuscript. All authors commented on the manuscript.

Corresponding authors

Correspondence to **bo **e  (谢**波) or Yanhui Chu  (褚衍辉).

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Conflict of interest The authors declare that they have no conflict of interest.

Additional information

Supplementary information Supporting data are available in the online version of the paper.

Yang Liu is currently a PhD student at South China University of Technology. His research interest focuses on the corrosion resistance of high-entropy silicates.

**bo **e is currently an associate professor at South China University of Technology. He received his PhD degree from University of Science and Technology of China in 2001. From 2001 to 2003, he was as a postdoctoral researcher at Sun Yat-sen University. His current research interest mainly focuses on synthesis of high-entropy ceramic powders.

Yanhui Chu is currently a professor at South China University of Technology. He received his PhD degree from Northwestern Polytechnical University in 2016. From Jan. 2014 to Sep. 2015, he was as a visiting scholar at Harvard University. His current research interest mainly focuses on the design, modeling and fabrication of high-entropy ceramics.

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Liu, Y., Zhuang, L., **e, P. et al. (Gd1/7Dy1/7Ho1/7Er1/7Tm1/7Yb1/7Lu1/7)2Si2O7 high-entropy disilicate: A promising environmental barrier coating material. Sci. China Mater. (2024). https://doi.org/10.1007/s40843-024-2998-6

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