The SiO₂-deposited Al₂O₃-SiO₂ aerogel (Si-ASA) with high thermal stability and mechanical properties was synthesized by silica deposition method during aging. Compared with the ASA without silica deposition, the Si-ASA maintains higher specific surface areas after being calcined at 1000 °C (384.0), 1100 °C (245.5), and 1200 °C (124.2 m²/g). When the heating temperature exceeds 1000 °C, the mullite phase begins to appear, and the crystallization activation energy of the Si-ASA (1019.24 kJ/mol) is higher than that of the ASA (975.95 kJ/mol). The results show that silica deposition can restrain viscous flow between particles and increase skeleton strength by particles growth and skeleton coarsening, and it can restrain the growth of γ-Al₂O₃ by forming more SiOAl bonds in the system. This work is of great significance to the design of super thermal insulation materials with high thermal stability.

通过时效过程中的二氧化硅沉积法合成了具有高热稳定性和机械性能的SiO ₂沉积Al ₂ O ₃ -SiO ₂气凝胶（Si-ASA）。与没有二氧化硅沉积的ASA相比，Si-ASA在1000°C（384.0），1100°C（245.5）和1200°C（124.2 m ²）煅烧后保持较高的比表面积/G）。当加热温度超过1000℃时，莫来石相开始出现，并且Si-ASA的结晶活化能（1019.24kJ / mol）高于ASA的结晶活化能（975.95kJ / mol）。结果表明，二氧化硅的沉积可以抑制颗粒之间的粘性流动，并通过颗粒的生长和骨架的粗化来增加骨架的强度，并且可以通过在系统中形成更多的Si OA l键来抑制γ- Al ₂ O ₃的生长。这项工作对设计具有高热稳定性的超级隔热材料具有重要意义。