Abstract: The aerogel composites after heat treatment at different temperatures were tested and analyzed by means of scanning electron microscope, specific surface area and porosity tester, infrared spectrometer and XRD. The results showed that the density, linear shrinkage, thermal conductivity, compression strength and compression modulus of the aerogel composites increased after heat treatment below 1 100 ℃, but the change was not obvious, indicating that the aerogel composites could maintain stable structure and properties at 1 100 ℃. When the heat treatment temperature was 1 200 ℃, the structure and properties of the aerogel composites changed obviously. On the microscopic scale, the pore structure of the aerogel collapsed seriously, and the density increased suddenly. On the macro scale, the aerogel composites became hard and shrinked seriously. On the properties, the thermal conductivity of composites increased obviously, the thermal insulation performance decreased, the compression strength and compression modulus increased obviously, and the toughness of the aerogel composites decreased obviously. It showed that after 1 200 ℃ heat treatment, the aerogel structure was seriously damaged, and its performance decreased obviously. In this work, the effect of heat treatment on the properties of silica aerogel composites was studied, the road of the research for reusable high-temperature silica aerogel composites was explored.
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2019, Vol. 33 
