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Unveiling the Corrosion Mechanisms of High‐Entropy RETaO4 Through In Situ Observation.

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Název: Unveiling the Corrosion Mechanisms of High‐Entropy RETaO4 Through In Situ Observation.
Autoři: Chen, Zeyu, Huang, Yiling, Peng, Fan, Lin, Chucheng, Zheng, Wei, Song, Xuemei, Niu, Yaran, Zeng, Yi
Zdroj: Advanced Science; 10/20/2025, Vol. 12 Issue 39, p1-11, 11p
Témata: CORROSION engineering, RARE earth metals, X-ray diffraction, THERMAL barrier coatings, SCIENTIFIC observation, PYROCHLORE, RARE earth oxides
Abstrakt: The ambiguous understanding of calcium‐magnesium aluminosilicate (CMAS) corrosion mechanisms in RETaO4 has hindered performance optimization through rare‐earth compositional engineering. This study systematically investigates the corrosion behavior of 3–10 component RETaO4 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 (Ca2‐a‐bREaAlb)(Ta2‐c‐dMgcSid)O7. A reaction‐diffusion mechanism of CMAS corrosion for RETaO4 is proposed, highlighting the different behaviors of various rare earth elements in the corrosion process. Among eight types of RETaO4, La1/6Nd1/6Sm1/6Eu1/6Gd1/6Dy1/6TaO4 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. [ABSTRACT FROM AUTHOR]
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Databáze: Complementary Index
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Abstrakt:The ambiguous understanding of calcium‐magnesium aluminosilicate (CMAS) corrosion mechanisms in RETaO4 has hindered performance optimization through rare‐earth compositional engineering. This study systematically investigates the corrosion behavior of 3–10 component RETaO4 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 (Ca2‐a‐bREaAlb)(Ta2‐c‐dMgcSid)O7. A reaction‐diffusion mechanism of CMAS corrosion for RETaO4 is proposed, highlighting the different behaviors of various rare earth elements in the corrosion process. Among eight types of RETaO4, La1/6Nd1/6Sm1/6Eu1/6Gd1/6Dy1/6TaO4 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. [ABSTRACT FROM AUTHOR]
ISSN:21983844
DOI:10.1002/advs.202509828