Extreme Materials

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Corrosion performance of high-entropy (Ho_0.2Er_0.2Tm_0.2Yb_0.2Lu_0.2)₂Si₂O₇ environmental barrier coating material under CMAS conditions at 1500 ℃

Zhang Zhenya, Yuan Shuai, Zhu Zihao, Gao Wei, Meng Yifan, Xue Zhaolu, Xiang Tengfei, Shen Yizhou, Yan Kai, Gyawali Gobinda, Zhang Shihong

Extreme Materials, DOI: 10.1016/j.exm.2026.01.001

Fig.11 Reaction layer thickness in (5RE_0.2)₂Si₂O₇ ceramic (a), and average apatite formation rate (μm/h^0.5) vs. corrosion time ^0.5 (h^0.5) for Yb₂Si₂O₇ ceramic (b) pellets during CMAS corrosion for different times at 1500 ℃

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Fig.1 Schematic diagram of preparation of (5RE_0.2)₂Si₂O₇ powder and bulk.
Fig.2 XRD patterns (a), Rietveld refinement of XRD pattern (b), Raman spectrum (c), and crystal structure (d) of high-entropy (5RE_0.2)₂Si₂O₇
Table 1 Crystal structure parameters of high-entropy (5RE_0.2)₂Si₂O₇ and individual RE₂Si₂O₇
Fig. 3 Microstructure, EDS maps, and elemental composition of high-entropy (5RE_0.2)₂Si₂O₇ ceramic
Fig. 4 Heat capacity (a), thermal diffusivity coefficient (b), and thermal conductivity (c) of high-entropy (5RE_0.2)₂Si₂O₇ ceramic
Table 2. Thermal conductivity of (5RE_0.2)₂Si₂O₇ and each single principal RE₂Si₂O₇
Fig. 5 TG/DSC curves of high-entropy (5RE_0.2)₂Si₂O₇ from room temperature to 1500 °C
Fig. 6 Schematic diagram of microhardness of high-entropy (5RE_0.2)₂Si₂O₇
Fig.7 XRD patterns of the molten CMAS corrosion of (5RE_0.2)₂Si₂O₇ pellets for different times at 1500℃
Fig.8 Surface morphologies of the molten CMAS corrosion of (5RE_0.2)₂Si₂O₇ pellets for various durations at 1500 °C
Table 3 Atomic ratios (at%) of the corresponding points in Fig. 8
Fig. 9 Cross-sectional microstructures of the molten CMAS corrosion of (5RE_0.2)₂Si₂O₇ pellets for different times at 1500 °C.
Table 4 Atomic ratios (at%) of the corresponding points in Fig. 9
Fig. 10 Cross-sectional microstructures and EDS maps of (5RE_0.2)₂Si₂O₇ and Yb₂Si₂O₇ pellets after CMAS corrosion for 20 h at 1500 ℃

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