Materials Reports  2021, Vol. 35 Issue (z2): 90-93 |
| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| Preparation and Thermal Conductivity of High Temperature Silica Aerogel Composites |
| GUO Jianye1, ZHAO Yingmin2, LI Wenjing1, YANG Jieying1, WANG Ruijie1, SU Lijun1
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1 Research Institute of Aerospace Special Materials and Processing Technology, Beijing 100074, China
2 HIWING Technology Academy of CASIC, Beijing 100074, China |
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Abstract Silica sol was used as precursor to prepare silica aerogel composites by using RTM technology. The structure characterization of the aerogel composites was carried out. The thermal insulation and temperature resistance of aerogel composites were tested, the results show that the back temperature of 20 mm thick material is 186 ℃ after 900 ℃ and 1 000 s quartz lamp test, the linear shrinkage of material is 1.2% after 1 000 s muffle furnace test at 1 100 ℃, the aerogel composites have excellent thermal insulation and temperature resistance. The effect of temperature on the thermal conductivity of aerogel composites was studied, the results show that the thermal conductivity of aerogel composites increases with the increase of temperature, the thermal conductivity at 900 ℃ is 5 times of the thermal conductivity at room temperature. The influe-nce of gas environment on the thermal conductivity of aerogel composites was studied, the results show that the thermal conductivity of aerogel composites in nitrogen environment is basically the same as that in air environment.
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Published: 09 December 2021
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About author:: Jianye Guo received his M.S. degrees in April 2016 from the Third Research Institute of China Aerospace Science. He is currently an engineer in Research Institute of Aerospace Special Materials and Technology. His research interests are thermal protection materials.
Yingmin Zhao received his M.S. degrees in physical chemistry from Jilin University in July 1993. He is currently a professor in HIWING Technology Academy of CASIC. His research interests are non-metallic functional materials. |
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