Mechanism-guided prediction of CMAS corrosion resistance and service life for high-entropy rare-earth disilicates
Peer-Reviewed Publication
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To achieve a deep understanding of the CMAS corrosion mechanism and lifetime prediction of high-performance thermal/environmental barrier coating materials, the (Er1/4Y1/4Lu1/4Yb1/4)2Si2O7 and (Er1/6Tm1/6Y1/15Gd1/15Lu4/15Yb4/15)2Si2O7 high-entropy rare-earth disilicates designed in this study exhibit approximately 70% reduction in CMAS corrosion depth compared to their single-principal-component counterparts, demonstrating excellent CMAS corrosion resistance. The research further reveals that lattice distortion induced by multi-cation doping can inhibit the penetration of CMAS melt, while large-radius rare-earth ions reduce the corrosion activity by consuming Ca²⁺ in the melt. Additionally, it elucidates the temperature-dependent transition of corrosion mechanisms—dominantly governed by thermodynamics–kinetics competition at 1300 °C, whereas shifting to a dissolution–reprecipitation mechanism at 1500 °C. On this basis, an extended Kalman filter model incorporating physical mechanisms was developed for the first time, enabling high-precision prediction of long-term corrosion depth and rate, thereby providing a reliable tool for coating lifetime assessment.
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