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Journal of Advanced Ceramics 2022, 11(11): 1801-1814 https://doi.org/10.1007/s40145-022-0649-4
Research Article | Open Access | Issue | Published: 26 October 2022

Ti4+-incorporated fluorite-structured high-entropy oxide (Ce,Hf,Y,Pr,Gd)O2−δ: Optimizing preparation and CMAS corrosion behavior

Show Author's Information Fuhao CHENG,  Fengnian ZHANG,  Yufeng LIU,  Meng GUO,  Chufei CHENG,  Jiadong HOU,  Yang MIAO( ),  Feng GAO,  Xiaomin WANG( )
College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Keywords:
high-entropy ceramics (HECs), high-temperature stability, fluorite structure, calcium–magnesium–alumina–silicate (CMAS) corrosion
Cite this article:
CHENG F, ZHANG F, LIU Y, et al. Ti4+-incorporated fluorite-structured high-entropy oxide (Ce,Hf,Y,Pr,Gd)O2−δ: Optimizing preparation and CMAS corrosion behavior. Journal of Advanced Ceramics, 2022, 11(11): 1801-1814. https://doi.org/10.1007/s40145-022-0649-4
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Abstract Full text Electronic supplementary material About this article

Environmental barrier coatings (EBCs) with excellent chemical resistance and good high-temperature stability are of great significance for their applications in next-generation turbine engines. In this work, a new type of high-entropy fluorite-structured oxide (Ce0.2Hf0.2Y0.2Pr0.2Gd0.2)O2−δ (HEFO-1) with different Ti4+ contents were successfully synthesized. Minor addition of Ti4+ could be dissolved into a high-entropy lattice to maintain the structure stable, effectively reducing the phase formation temperature and promoting the shrinkage of bulk samples. Heat treatment experiments showed that all the samples remained a single phase after annealing at 1200–1600 ℃ for 6 h. In addition, high-entropy (Ce0.2Hf0.2Y0.2Pr0.2Gd0.2Ti0.2x)O2−δ demonstrated great resistance to calcium–magnesium–alumina–silicate (CMAS) thermochemical corrosion. When the content of Ti was increased to x = 0.5, the average thickness of the reaction layer was about 10.5 µm after being corroded at 1300 ℃ for 10 h. This study reveals that high-entropy (Ce0.2Hf0.2Y0.2Pr0.2Gd0.2Ti0.2x)O2−δ is expected to be a candidate for the next-generation EBC materials with graceful resistance to CMAS corrosion.


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About this article

Ti4+-incorporated fluorite-structured high-entropy oxide (Ce,Hf,Y,Pr,Gd)O2−δ: Optimizing preparation and CMAS corrosion behavior

Show Author's information Fuhao CHENG, Fengnian ZHANG, Yufeng LIU, Meng GUO, Chufei CHENG, Jiadong HOU, Yang MIAO( ), Feng GAO, Xiaomin WANG( )
College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China

Abstract

Environmental barrier coatings (EBCs) with excellent chemical resistance and good high-temperature stability are of great significance for their applications in next-generation turbine engines. In this work, a new type of high-entropy fluorite-structured oxide (Ce0.2Hf0.2Y0.2Pr0.2Gd0.2)O2−δ (HEFO-1) with different Ti4+ contents were successfully synthesized. Minor addition of Ti4+ could be dissolved into a high-entropy lattice to maintain the structure stable, effectively reducing the phase formation temperature and promoting the shrinkage of bulk samples. Heat treatment experiments showed that all the samples remained a single phase after annealing at 1200–1600 ℃ for 6 h. In addition, high-entropy (Ce0.2Hf0.2Y0.2Pr0.2Gd0.2Ti0.2x)O2−δ demonstrated great resistance to calcium–magnesium–alumina–silicate (CMAS) thermochemical corrosion. When the content of Ti was increased to x = 0.5, the average thickness of the reaction layer was about 10.5 µm after being corroded at 1300 ℃ for 10 h. This study reveals that high-entropy (Ce0.2Hf0.2Y0.2Pr0.2Gd0.2Ti0.2x)O2−δ is expected to be a candidate for the next-generation EBC materials with graceful resistance to CMAS corrosion.

Keywords: high-entropy ceramics (HECs), high-temperature stability, fluorite structure, calcium–magnesium–alumina–silicate (CMAS) corrosion

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Publication history

Received: 19 May 2022
Revised: 04 August 2022
Accepted: 19 August 2022
Published: 26 October 2022
Issue date: November 2022

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© The Author(s) 2022.

Acknowledgements

This research was supported by the National Natural Science Foundation for Young Scientists of China (Grant No. 51802213), Program of Applied Basic Research Program of Shanxi Province (Grant No. 201901D211118), and Key R&D Program of Shanxi Province (Grant No. 202102030201006).

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