Atmospheric Pressure Preparation and Property Characterization of SiO2 Aerogel Fiber Thermal Insulation Composites

Abstract

Abstract: SiO₂ aerogel has poor mechanical properties and strong thermal insulation properties. In order to make SiO₂ aerogel a good thermal insulation material, a preparation method of SiO₂ aerogel fiber thermal insulation composites was proposed. SiO₂ aerogel fiber insulation composites were prepared under atmospheric pressure condition by ethyl orthosilicate (TEOS) as precursor, glass fiber and ceramic fiber as reinforcers, and silane coupling agents KH550 and KH570 as fiber treatment agents, and the material properties were characterized. The results show that the higher the content of hexadecyl trimenthyl ammonium (CTAB) in precursor is, the lower the thermal conductivity of SiO₂ aerogel in composite is, which can be as low as 0.028 W/(m·K). When using silane coupling agent KH550, the interface bonding strength between matrix and fiber is higher. The mechanical properties of SiO₂ aerogel reach a high level with the addition of fiber. When the molar ratio of TEOS to CTAB is 1∶0.022, the thermal conductivity of glass fiber/SiO₂ aerogel composites treated with KH550 is 0.054 W/(m·K), the mechanical properties are good, and the thermal insulation property is optimal.

Key words: SiO₂ aerogel, thermal insulation composite, silane coupling agent, fiber composite, atmospheric drying, thermal conductivity, mechanical property

CLC Number:

TB332

DU Cuifeng, LI Lijun, WANG Yuan, CHANG Baomeng, WANG Jiuzhu. Atmospheric Pressure Preparation and Property Characterization of SiO₂ Aerogel Fiber Thermal Insulation Composites[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(12): 4406-4411.

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Atmospheric Pressure Preparation and Property Characterization of SiO₂ Aerogel Fiber Thermal Insulation Composites

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