In this research, a novel method for regulating components in RE₂SiO₅/RE₂Si₂O₇ multiphase silicates was developed, combining the benefits of suitable thermal expansion coefficient (CTE) and outstanding corrosion resistance against calcium-magnesium-alumino-silicate (CMAS). This approach enhanced the overall thermophysical properties. Additionally, the results from the CMAS corrosion resistance test indicated that (Lu1/3Yb1/3Tm1/3)₂SiO₅/(Lu1/3Yb1/3Tm1/3)₂Si₂O₇ and (Lu1/4Yb1/4Tm1/4Er1/4)₂SiO₅/(Lu1/4Yb1/4Tm1/4Er1/4)₂Si₂O₇ exhibited exceptional resistance to CMAS penetration, even at temperatures up to 1500 ℃. To comprehend the corrosion mechanism of CMAS on these silicates, we introduced a reaction-diffusion model, which involved observing interface changes between the corrosion product layer and the silicate block. This was achieved using Electron Back Scatter Diffraction (EBSD). These findings lay a theoretical basis for selecting rare earth elements in RE₂SiO₅/RE₂Si₂O₇ multiphase silicates based on the radius of different rare earth cations.
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Chen et al. (2024) studied this question.
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