Novel fibrous/nano-Al2O3 insulation composites produced using sol-gel impregnation for energy-saving

作者：Li, Yuanbing^*; Liu, Jingfei; Yin, Bo; Li, Shujing; Chen, Pan; Cai, Zhen

来源：Journal of Sol-Gel Science and Technology, 2023, 107(3): 598-607.

DOI：10.1007/s10971-023-06140-8

• Refractory ceramic fiber
• Nano-Al2O3
• Sol-gel
• Thermal conductivity

The sol-gel method is a technique used to create a controlled porous structure by building up colloidal particles during the gelation process. In this study, a sol-gel method was utilized to prepare fibrous/nano-Al2O3 insulation composites using glass fiber, nano-Al2O3, and silica sol as primary materials for performance characterization. The samples exhibited high porosities (78.35-81.30%) and low thermal conductivities (0.084-0.159 W m(-1) k(-1) at 200-600 ? ). The introduction of nano-Al2O3 resulted in a well-distributed aperture hierarchy and promoted multidirectional heat transfer paths. The fibers were arranged in a three-dimensional structure, overlapping each other, while the nano-powders were dispersed in a liquid phase and cross-linked to form a spatial mesh structure. The findings of this research have potential applications in heat preservation and energy-saving.