In this study, tailored heat treatment was employed to lower the flammability of hydrophobic silica aerogels (HSA). The effects of heat treatment temperature, time, and heating rate on the pore structure and flammability of the treated SA were investigated in detail. It was revealed that the heat-treated HSA still maintained a mesoporous structure with a lower tap density and a higher specific surface area. The chemical groups of the treated HSA were influenced significantly by the heat treatment temperature but were independent of the heat treatment time and heating rate. Due to the removal of organic groups, the flammability of the heat-treated SA was reduced significantly. Hence, it was demonstrated that reducing the flammability of HSA by tailored heat treatment was feasible, which can provide a simple approach to reduce the flammability of SA and benefited their expansion in thermal insulation field.

在这项研究中，采用量身定制的热处理来降低疏水性二氧化硅气凝胶（HSA）的可燃性。详细研究了热处理温度，时间和加热速率对处理过的SA的孔结构和可燃性的影响。结果表明，经热处理的HSA仍保持具有较低的振实密度和较高的比表面积的中孔结构。所处理的HSA的化学基团受到热处理温度的显着影响，但与热处理时间和加热速率无关。由于去除了有机基团，热处理后的SA的可燃性大大降低。因此，证明了通过定制热处理降低HSA的可燃性是可行的，