Role of configurational entropy in enhancing CMAS corrosion resistance of rare-earth zirconates

Shihua ZHANG; Kunying DING; Zhongshen DONG; Jianhai YU; Yubo SUN; Tao ZHANG; Jiaxi YUAN; Jintao LU

doi:10.7527/S1000-6893.2025.32302

ACTA AERONAUTICAET ASTRONAUTICA SINICA >

2026 , Vol. 47 >Issue 5: 432302 - 432302

DOI: https://doi.org/10.7527/S1000-6893.2025.32302

Material Engineering and Mechanical Manufacturing

Role of configurational entropy in enhancing CMAS corrosion resistance of rare-earth zirconates

Shihua ZHANG ,
Kunying DING ,
Zhongshen DONG ,
Jianhai YU ,
Yubo SUN ,
Tao ZHANG ,
Jiaxi YUAN ,
Jintao LU

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^1.Tianjin Key Laboratory of Civil Aircraft Airworthiness and Maintenance，Civil Aviation University of China，Tianjin 300300，China
^2.Engineering & Technology Branch，China Southern Airlines Co. ，Ltd. ，Shenyang 110170，China

E-mail：dingkunying@126.com

Received date: 2025-05-27

Revised date: 2025-06-30

Accepted date: 2025-08-04

Online published: 2025-08-11

Supported by

National Key Research and Development Program(2023YFB4302400)

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Abstract

To investigate the influencing factors of CMAS corrosion resistance in rare-earth zirconates， seven low-， medium-， and high-entropy rare-earth zirconates RExZO （RE = Y， Ho， Dy， Er， Gd， Yb， Tm； x = 1-7） were prepared， and their CMAS corrosion behaviors at 1 300 ℃ were systematically studied. Results indicate that rare-earth zirconate materials undergo dissolution damage upon contact with CMAS at high temperatures， accompanied by the formation of a new apatite phase. The high-entropy structure facilitated the development of a dense reaction layer composed of apatite and fluorite phases through a “dissolution-reprecipitation” mechanism， significantly reducing the maximum infiltration depth from 80.6 μm for RE1ZO to 30.9 μm for RE7ZO （a 61.7% reduction）. Influenced by ionic radius variations， dissolved rare-earth elements exhibited gradient diffusion into the apatite and fluorite phases. Correlation analyses reveal a significant positive relationship between corrosion depth and optical basicity difference， while showing significant negative correlations with configurational entropy and atomic size disorder. First-principles calculations and XPS results further confirm that high configurational entropy reduces the Gibbs free energy and oxygen vacancy concentration of rare-earth zirconates while enhancing elemental binding energy， thereby improving structural stability. Based on these findings， an optimization strategy for designing CMAS-resistant rare-earth zirconates is proposed： priority should be given to material combinations featuring low optical basicity difference， high configurational entropy， and high atomic size disorder.

Key words： rare-earth zirconate; configurational entropy; CMAS corrosion; thermal barrier coating; high-entropy ceramic

Cite this article

Shihua ZHANG , Kunying DING , Zhongshen DONG , Jianhai YU , Yubo SUN , Tao ZHANG , Jiaxi YUAN , Jintao LU . Role of configurational entropy in enhancing CMAS corrosion resistance of rare-earth zirconates[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2026 , 47(5) : 432302 -432302 . DOI: 10.7527/S1000-6893.2025.32302

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