Investigation of improving the thermophysical properties and corrosion resistance of RE 2 SiO 5 /RE 2 Si 2 O 7 multiphase silicates by component design with RE doping

作者：Zeyu Chen, Yiling Huang, Zhaoxuan Zhang, Wei Zheng, Xuemei Song, Yaran Niu, Yi Zeng · 发表于：Journal of Advanced Ceramics · 年份：2024 · DOI：10.26599/jac.2024.9220903 · 被引用次数：31 · 研究领域：Advanced ceramic materials synthesis、Nuclear materials and radiation effects、Glass properties and applications

In this research, a novel method for regulating components in RE 2 SiO 5 /RE 2 Si 2 O 7 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 (Lu 1/3 Yb 1/3 Tm 1/3 ) 2 SiO 5 /(Lu 1/3 Yb 1/3 Tm 1/3 ) 2 Si 2 O 7 and (Lu 1/4 Yb 1/4 Tm 1/4 Er 1/4 ) 2 SiO 5 /(Lu 1/4 Yb 1/4 Tm 1/4 Er 1/4 ) 2 Si 2 O 7 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 RE 2 SiO 5 /RE 2 Si 2 O 7 multiphase silicates based on the radius of different rare earth cations.