Unveiling the Corrosion Mechanisms of High‐Entropy RETaO <sub>4</sub> Through In Situ Observation

The ambiguous understanding of calcium-magnesium aluminosilicate (CMAS) corrosion mechanisms in RETaO<sub>4</sub> has hindered performance optimization through rare-earth compositional engineering. This study systematically investigates the corrosion behavior of 3-10 component RETaO<sub>4</sub> systems. In situ X-ray diffraction/Transmission electron microscope coupled with Electron backscatter diffraction analysis unveils dynamic reaction pathways during the pre-corrosion heating stage, identifying the crystallization and growth patterns of dominant corrosion product pyrochlore-structured (Ca<sub>2-a-b</sub>RE<sub>a</sub>Al<sub>b</sub>)(Ta<sub>2-c-d</sub>Mg<sub>c</sub>Si<sub>d</sub>)O<sub>7</sub>. A reaction-diffusion mechanism of CMAS corrosion for RETaO<sub>4</sub> is proposed, highlighting the different behaviors of various rare earth elements in the corrosion process. Among eight types of RETaO<sub>4</sub>, La<sub>1/6</sub>Nd<sub>1/6</sub>Sm<sub>1/6</sub>Eu<sub>1/6</sub>Gd<sub>1/6</sub>Dy<sub>1/6</sub>TaO<sub>4</sub> exhibits the best corrosion resistance, with a relatively thin corrosion layer and the ability to avoid element segregation and localized infiltration. These findings establish composition-property relationships for designing next-generation corrosion-resistant thermal barrier coatings.

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Publication Details

Journal
Advanced Science
Published
2025-07-21
DOI
https://doi.org/10.1002/advs.202509828
Primary Topic
Electronic and Structural Properties of Oxides
Type
article
Field-Weighted Citation Impact
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article

Unveiling the Corrosion Mechanisms of High‐Entropy RETaO 4 Through In Situ Observation

Peng Fan, Yaran Niu, Wei Zheng, Yiling Huang et al.
Advanced Science
Electronic and Structural Properties of Oxides
article

Unveiling the Corrosion Mechanisms of High‐Entropy RETaO 4 Through In Situ Observation

Peng Fan, Yaran Niu, Wei Zheng, Yiling Huang, Zeyu Chen, Xuemei Song, Chucheng Lin, Yi Han Zeng
article en

Abstract

The ambiguous understanding of calcium-magnesium aluminosilicate (CMAS) corrosion mechanisms in RETaO<sub>4</sub> has hindered performance optimization through rare-earth compositional engineering. This study systematically investigates the corrosion behavior of 3-10 component RETaO<sub>4</sub> systems. In situ X-ray diffraction/Transmission electron microscope coupled with Electron backscatter diffraction analysis unveils dynamic reaction pathways during the pre-corrosion heating stage, identifying the crystallization and growth patterns of dominant corrosion product pyrochlore-structured (Ca<sub>2-a-b</sub>RE<sub>a</sub>Al<sub>b</sub>)(Ta<sub>2-c-d</sub>Mg<sub>c</sub>Si<sub>d</sub>)O<sub>7</sub>. A reaction-diffusion mechanism of CMAS corrosion for RETaO<sub>4</sub> is proposed, highlighting the different behaviors of various rare earth elements in the corrosion process. Among eight types of RETaO<sub>4</sub>, La<sub>1/6</sub>Nd<sub>1/6</sub>Sm<sub>1/6</sub>Eu<sub>1/6</sub>Gd<sub>1/6</sub>Dy<sub>1/6</sub>TaO<sub>4</sub> exhibits the best corrosion resistance, with a relatively thin corrosion layer and the ability to avoid element segregation and localized infiltration. These findings establish composition-property relationships for designing next-generation corrosion-resistant thermal barrier coatings.

Advanced ScienceVol. 12(39)
Chinese Academy of Sciences (CN), Shanghai Institute of Ceramics (CN)
Openalex Percentile: Top 87%
Electronic and Structural Properties of Oxides
DOIOpen Access PDFOpenAlex
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