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Preparation of Al2O3-SiO2 aerogel by ambient pressure drying for thermal insulation application

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Abstract

Al2O3-SiO2 aerogel (ASA) was prepared by convenient ambient pressure drying using inexpensive AlCl3·H2O as precursor, and silicon was deposited during the aging of aluminum gel. To explore the influence of Chloride ion on the property of ASA, ion exchange technology was used to remove the Chloride ion in the aluminum sol. ASA exhibits a low thermal conductivity of 0.029 W m−1 K−1 at room temperature, and the specific surface area of Cl-free ASA after heat-treated at 1200 °C is 95.2 m2/g, which is higher than that of the chlorine-containing aerogel (11.4 m2/g), showing enhanced thermal stability of ASA. Analysis of XRD and XPS indicate that the removal of chloride ions makes it more difficult for ASA to establish Al–O–Si groups during the aging process, so the γ-Al2O3 and cristobalite phase do not transform to mullite phase at 1200 °C. Due to the better thermal stability of ASA, it has great potential for high-temperature applications in the fields of insulation, thermal protection materials, and building external wall thermal insulation.

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Acknowledgements

We acknowledge the funding supports from National Natural Science Foundation of China (Grant. No.: 51972222).

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Authors and Affiliations

  1. Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education, School of Materials Science and Engineering, Tianjin University, Tianjin, 300350, China

    Wenpu Zhao, Yuecheng Ji, Yifan Pang, Xiaolei Li & Huiming Ji

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Contributions

WZ: Conceptualization, Experimentalize, Data curation, Writing – original draft. YJ: Data curation. YP: Validation. XL: Supervision. HJ: Supervision Review & Editing.

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Correspondence to Huiming Ji.

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Zhao, W., Ji, Y., Pang, Y. et al. Preparation of Al2O3-SiO2 aerogel by ambient pressure drying for thermal insulation application. J Porous Mater 30, 1753–1761 (2023). https://doi.org/10.1007/s10934-023-01457-9

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