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The demand for high operating temperatures in gas turbine engines requires an urgent need for environmental barrier coatings (EBCs) materials that exhibit excellent resistance to molten calcium-magnesium-aluminum-silicate (CMAS) glasses. In this study, three types of (RE0.5Yb0.5)2Si2O7 (RE = Sc, Er, or Yb) bulk ceramics were prepared using an in-situ solid-phase reaction method, and their CMAS corrosion behaviors were investigated at 1500 °C. The results indicated that all the prepared bulk ceramics exhibited high densification and β-disilicate phase purity, and they showed both dissolution and penetration phenomena under CMAS corrosion at high temperatures. For Yb2Si2O7 and (Sc0.5Yb0.5)2Si2O7 ceramics, no significant apatite phase was detected. However, a large amount of apatite phases was observed in the CMAS residual zone of (Er0.5Yb0.5)2Si2O7 ceramics. Furthermore, it is probable that (Sc0.5Yb0.5)2Si2O7 has the smallest average RE-O bond length, leading to the highest resistance to CMAS dissolution, which is approximately 4.6 times higher than that of Yb2Si2O7, and 5.5 times higher than that of (Er0.5Yb0.5)2Si2O7. These findings may provide insights into the modification of CMAS corrosion resistance after doping of Sc or Er elements into the Yb2Si2O7 matrix lattice, and lay the foundation for designing high-entropy EBCs with superior CMAS resistance.

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Preparation and Calcium-Magnesium-Alumina-Silicate Corrosion Resistance of (RE0.5Yb0.5)2Si2O7 (RE = Sc, Er, or Yb) Ceramics at 1500 °C

  • 会议论文

  • 发表日期：

    2026年

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  • Kaibin Li,
  • Weize Wang,
  • Shilong Yang,
  • Yangguang Liu,
  • Hongchen Li,
  • Wenkang Zhang,
  • Changliang Wang,
  • Xiuxin Du

摘要

The demand for high operating temperatures in gas turbine engines requires an urgent need for environmental barrier coatings (EBCs) materials that exhibit excellent resistance to molten calcium-magnesium-aluminum-silicate (CMAS) glasses. In this study, three types of (RE0.5Yb0.5)2Si2O7 (RE = Sc, Er, or Yb) bulk ceramics were prepared using an in-situ solid-phase reaction method, and their CMAS corrosion behaviors were investigated at 1500 °C. The results indicated that all the prepared bulk ceramics exhibited high densification and β-disilicate phase purity, and they showed both dissolution and penetration phenomena under CMAS corrosion at high temperatures. For Yb2Si2O7 and (Sc0.5Yb0.5)2Si2O7 ceramics, no significant apatite phase was detected. However, a large amount of apatite phases was observed in the CMAS residual zone of (Er0.5Yb0.5)2Si2O7 ceramics. Furthermore, it is probable that (Sc0.5Yb0.5)2Si2O7 has the smallest average RE-O bond length, leading to the highest resistance to CMAS dissolution, which is approximately 4.6 times higher than that of Yb2Si2O7, and 5.5 times higher than that of (Er0.5Yb0.5)2Si2O7. These findings may provide insights into the modification of CMAS corrosion resistance after doping of Sc or Er elements into the Yb2Si2O7 matrix lattice, and lay the foundation for designing high-entropy EBCs with superior CMAS resistance.