Corrosion behavior and mechanism of the Y2O3–Al2O3–SiO2 system during long-term corrosion in water-oxygen environment at 1350 °C

The effect of long-term corrosion in water-oxygen atmosphere at 1350 °C on the organization of eutectic glass of the Y2O3–Al2O3–SiO2 (YAS) system was investigated and the corrosion mechanism was analysed. As corrosion time increases, the surface crystals of glass-ceramics, especially cristobalite, i...

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Bibliographic Details
Published in:Ceramics international 2023-09, Vol.49 (17), p.28344-28353
Main Authors: Ma, Yujie, Yang, Shaobo, Meng, Xinyu, Kou, Sijie, Deng, Juanli, Fan, Shangwu
Format: Article
Language:English
Subjects:
Corrosion
Water-oxygen
X-phase
Y2O3–Al2O3–SiO2 system
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Summary:The effect of long-term corrosion in water-oxygen atmosphere at 1350 °C on the organization of eutectic glass of the Y2O3–Al2O3–SiO2 (YAS) system was investigated and the corrosion mechanism was analysed. As corrosion time increases, the surface crystals of glass-ceramics, especially cristobalite, is gradually consumed, resulting in a gradual increase in the roughness of the surface. Subsequently, the thermal expansion mismatch of corrosion products causes internal stresses, which result in cracks and accelerate corrosion of the glass-ceramics. It is worth mentioning that this eutectic composition showed an unknown X-phase after 100 h of corrosion, and its structure was reasonably predicted.
ISSN:0272-8842
DOI:10.1016/j.ceramint.2023.06.089