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Microstructure, thermomechanical performance, and CMAS corrosion resistance of high-entropy (Sc0.2Yb0.2Tm0.2Y0.2Gd0.2)2Si2O7 disilicate
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DOI：10.1016/j.mtla.2026.102813.png)
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Abstract
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A high entropy disilicate, (Sc0.2Yb0.2Tm0.2Y0.2Gd0.2)2Si2O7 (brief to (5RE0.2)2Si2O7), has been synthesized via solid state method. Phase identification through XRD and Raman spectra presents that (5RE0.2)2Si2O7 possesses the single β-type crystal (space group C2/m (12)). Microstructure analysis confirms the even distribution of constituent elements and high relative density (93.7%) of ceramic bulks. Subsequently, thermal/mechanical properties and anti-CMAS (typically CaO-MgO-Al2O3-SiO2) corrosion behaviors (1300/1400 °C) of (5RE0.2)2Si2O7 have been evaluated. Notably, compared with pure Yb2Si2O7, (5RE0.2)2Si2O7 demonstrates greater thermal/mechanical properties. Specifically, at 200–1200 °C, the coefficient of thermal expansion (CTE) of (5RE0.2)2Si2O7 (3.4–5.26 × 10–6 K–1) remains within the acceptable range for SiC-based ceramic composites. Meanwhile, (5RE0.2)2Si2O7 exhibits excellent high-temperature phase stability, lower thermal conductivity (1.28–1.88 W·m–1·K–1), enhanced hardness (HV: 7.44 ± 0.14 GPa), and improved fracture toughness (KIC: 2.43 ± 0.12 MPa·m¹/²). Furthermore, at 1300 °C and 1400 °C, (5RE0.2)2Si2O7 displays superior CMAS corrosion resistance, mainly owing to the formation of protective apatite layers. This study has effectively expanded the library of disilicate materials suitable for environmental barrier coatings (EBCs) via investigating compositional control and performance optimization within the disilicate system, offering valuable theoretical insights and practical guidance for the rational design of disilicate-based EBCs materials.
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