Novel nanometer alumina-silica insulation board with ultra-low thermal conductivity

作者：Liu, Jingfei; Li, Yuanbing^*; Li, Shujing; Chen, Pan

来源：Ceramics International, 2022, 48(8): 10480-10485.

DOI：10.1016/j.ceramint.2021.12.257

• Nanometer
• Process parameter
• Pore size distribution
• Thermal conductivity

Advanced nano-porous super thermal insulation materials are widely used in spacecraft, soler-thermal shielding, heat exchangers, photocatalytic carriers due to their low thermal conductivity. In this work, adopting dry preparation technology, nano-Al2O3, nano-SiO2, SiC and glass fibers as raw materials, novel nanometer alumina-silica insulation board (NAIB) were prepared. The preparation process was simple, safe, and reliable. In addition, the NAIB exhibited a high porosity (91.3-92.3%), small pore size (39.83-44.15 nm), low bulk density (0.22-0.26 g/cm(3)), better volumetric stability, and low thermal conductivity (0.031-0.050 W/(m.K) (200-800 degrees C)), respectively. The as-prepared NAIB could render them suitable for application as high-temperature thermal insulation materials.