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<p>Environmental barrier coatings (EBCs) are used to protect silicon carbide (SiC) components in gas turbine engines by inhibiting their surface reactions with water vapor and molten calcium-magnesium-alumino-silicates (CMAS). In this study, ytterbium monosilicate (Yb<sub>2</sub>SiO<sub>5</sub>) and mullite (3Al<sub>2</sub>O<sub>3</sub>.2SiO<sub>2</sub>) powders were synthesized and mixed with a specific content (mullite-12wt.%Yb<sub>2</sub>SiO<sub>5</sub>) as an EBC. The hot corrosion performance of the composite samples was investigated at 1300&#xa0;°C for various durations in contact with molten CMAS powder. Phase analysis of the synthesized powders and hot-corroded specimens was characterized using the X-ray diffraction (XRD) technique. A scanning electron microscope (SEM) equipped with an energy-dispersive spectrometer (EDS) was used to study the morphology and chemical composition of phases formed in the hot-corroded samples. The results showed that as the exposure time increased up to 48&#xa0;h, the rate of reaction-layer growth significantly decreased, indicating enhanced substrate protection at high temperatures. Additionally, the formation of resistant phases, such as Yb₃Al₅O₁₂ and anorthite, during the reaction leads to an improvement in coating performance. These findings highlight the potential of Yb₂SiO₅-based EBCs for advanced gas turbine applications.</p>

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An investigation on the hot corrosion behavior of mullite-12wt.%Yb2SiO5 as a novel EBC composite under CMAS melt attack

  • 期刊论文

  • 发表日期：

    2025年12月23日

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  • Alireza Hasani Arefi,
  • Majid Mohammadi,
  • Mostafa Hajian,
  • Seyedeh Mahla Seifzadeh Omrani,
  • Seyed Abdolkarim Sajjadi

摘要

Environmental barrier coatings (EBCs) are used to protect silicon carbide (SiC) components in gas turbine engines by inhibiting their surface reactions with water vapor and molten calcium-magnesium-alumino-silicates (CMAS). In this study, ytterbium monosilicate (Yb2SiO5) and mullite (3Al2O3.2SiO2) powders were synthesized and mixed with a specific content (mullite-12wt.%Yb2SiO5) as an EBC. The hot corrosion performance of the composite samples was investigated at 1300 °C for various durations in contact with molten CMAS powder. Phase analysis of the synthesized powders and hot-corroded specimens was characterized using the X-ray diffraction (XRD) technique. A scanning electron microscope (SEM) equipped with an energy-dispersive spectrometer (EDS) was used to study the morphology and chemical composition of phases formed in the hot-corroded samples. The results showed that as the exposure time increased up to 48 h, the rate of reaction-layer growth significantly decreased, indicating enhanced substrate protection at high temperatures. Additionally, the formation of resistant phases, such as Yb₃Al₅O₁₂ and anorthite, during the reaction leads to an improvement in coating performance. These findings highlight the potential of Yb₂SiO₅-based EBCs for advanced gas turbine applications.