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Comparative study of water vapor corrosion resistance in directionally solidified RE3Al5O12/Al2O3 eutectic ceramics at 1500°C: Effect of eutectic structure and rare earth elements
Cui Zhou, Zhilin Tian, Liya Zheng, Sikai Wang, Tiefeng Du, Jiemin Wang, Bin Yang, Min Guo, Luchao Sun, Jingyang Wang
Extreme Materials ›› 2026, Vol. 2 ›› Issue (1) : 58-68.
PDF(18275 KB)
PDF(18275 KB)
Comparative study of water vapor corrosion resistance in directionally solidified RE3Al5O12/Al2O3 eutectic ceramics at 1500°C: Effect of eutectic structure and rare earth elements
Al2O3-based directionally solidified eutectic (DSE) ceramics are recognized as promising candidates for high-temperature structural materials in advanced aeroengines. Nevertheless, their corrosion resistance at elevated temperatures continues to pose a critical challenge, limiting broader application in hot-section components. This study investigates corrosion behavior of RE3Al5O12 (REAG)/Al2O3 (RE = rare earth) DSE ceramics in water vapor atmosphere (90 H2O(g) + 10 vol% air(g)) at 1500°C for durations up to 200 h, with focus on the influence of eutectic structure and RE elements in garnet phases via examining three samples (high-entropy (Y0.2Gd0.2Ho0.2Er0.2Yb0.2)3Al5O12 DSEs fabricated at 10 and 300 mm/h and YAG/Al2O3 DSE grown at 10 mm/h). The results indicate that REAG/Al2O3 DSE ceramics exhibit excellent water vapor corrosion resistance at 1500°C for up to 200 h, with mass loss values ranging from −0.00757 to −0.00708 mg·cm−2·mg−1. During corrosion, Al2O3 phase acts as corrosion-susceptible component compared to REAG phase, with corrosion depth showing a nearly linear relationship with the average Al2O3 lamellar width. In addition, garnet phases experience slight grain growth, reducing the contact area between water vapor and Al2O3 phase; Gd demonstrates the slowest diffusion rate when compared to other RE elements. Despite these changes, all samples maintain their preferred crystallographic orientations, confirming the structural stability of REAG/Al2O3 DSEs under water vapor atmosphere at 1500°C.
Water vapor corrosion / RE3Al5O12/Al2O3 / Eutectic ceramic / Directional solidification
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Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
Thanks for supports from the National Key R&D Program of China (2024YFB3714504); National Natural Science Foundation of China (52130204, U21A2063); LiaoNing Revitalization Talents Program (XLYC2203090); International Partnership Program of the Chinese Academy of Sciences (172GJHZ2022094FN).
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