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<p>A novel high-entropy rare earth (Yb<sub>0.25</sub>Sc<sub>0.25</sub>Er<sub>0.25</sub>Tm<sub>0.25</sub>)<sub>2</sub>Si<sub>2</sub>O<sub>7</sub> or 4(YSET)<sub>0.25</sub> disilicate was fabricated through a solid-solution method to protect the underlying SiC substrate from harsh environment at elevated temperature. XRD analysis showed that the newly fabricated 4(YSET)<sub>0.25</sub> exactly matched with the constituent base Yb<sub>2</sub>Si<sub>2</sub>O<sub>7</sub> having a single stable <i>β</i> phase. The microstructure analysis showed that the powder was uniformly mixed. A CMAS exposure&#xa0;test was done to check the corrosion properties of 4(YSET)<sub>0.25</sub> at 1300&#xa0;°C for 4&#xa0;h and 48&#xa0;h. The 4(YSET)<sub>0.25</sub> showed better resistance against CMAS after 48&#xa0;h at 1300&#xa0;°C, and a negligible amount of Ca was able to penetrate toward the 4(YSET)<sub>0.25</sub> substrate. The overall performance of 4(YSET)<sub>0.25</sub> against CMAS was far better than their single constituent elements.</p>

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Excellent CMAS Corrosion Resistance of a Novel Multicomponent High-Entropy Rare Earth (Yb0.25Sc0.25Er0.25Tm0.25)2Si2O7 Disilicate

  • 期刊论文

  • 发表日期：

    2025年3月4日

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  • Sehreish Abrar,
  • Faisal Nazeer,
  • Abdul Malik

摘要

A novel high-entropy rare earth (Yb0.25Sc0.25Er0.25Tm0.25)2Si2O7 or 4(YSET)0.25 disilicate was fabricated through a solid-solution method to protect the underlying SiC substrate from harsh environment at elevated temperature. XRD analysis showed that the newly fabricated 4(YSET)0.25 exactly matched with the constituent base Yb2Si2O7 having a single stable β phase. The microstructure analysis showed that the powder was uniformly mixed. A CMAS exposure test was done to check the corrosion properties of 4(YSET)0.25 at 1300 °C for 4 h and 48 h. The 4(YSET)0.25 showed better resistance against CMAS after 48 h at 1300 °C, and a negligible amount of Ca was able to penetrate toward the 4(YSET)0.25 substrate. The overall performance of 4(YSET)0.25 against CMAS was far better than their single constituent elements.