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Fabrication of Al2O3 aerogel-SiO2 fiber composite with enhanced thermal insulation and high heat resistance

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Abstract

The thermal-resistance Al2O3 aerogels and Al2O3 aerogel-SiO2 fiber composite by using inorganic aluminum salt as the precursor were synthesized by the sol–gel process. The method was straightforward, inexpensive, and safe. Furthermore, it was found that the as-prepared Al2O3 aerogel had high crystal phase transition temperature. As the heat treatment temperature increased to 900 °C, the crystal phase transition from γ-AlOOH to γ-Al2O3 occurred within the Al2O3 aerogel. Meanwhile, the Al2O3 aerogel-SiO2 fiber composite exhibited high Young’s modulus of tensile strength up to 6.59 MPa and low thermal conductivity at 35 °C (0.028 W/(m K)) and high temperature of 600 °C (0.033 W/(m K)). In addition, the results indicated that the Al2O3 aerogel-SiO2 fiber composite had the moderate hydrophobic property as well as mechanical property.

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Acknowledgements

This research was financially supported by Sichuan Science and Technology Program (No. 2018RZ0127), the Project of State Key Laboratory of Environment-friendly Energy Materials, Southwest University of Science and Technology (Nos. 17FKSY0111 and 18zxhk16) and the Doctoral Research Fund of Southwest University of Science and Technology (No. 16zx7142).

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Authors and Affiliations

  1. State Key Laboratory of Environment-friendly Energy Materials, School of Material Science and Engineering, Southwest University of Science and Technology, 621010, Mianyang, People’s Republic of China

    Shangyan Wen

  2. State Key Laboratory of Environment-friendly Energy Materials, School of Science, Southwest University of Science and Technology, 621010, Mianyang, People’s Republic of China

    Shangyan Wen, Hongbo Ren, Jiayi Zhu & Yutie Bi

  3. Research Center of Laser Fusion, China Academy of Engineering Physics, 621900, Mianyang, People’s Republic of China

    Lin Zhang

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  1. Shangyan Wen
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Wen, S., Ren, H., Zhu, J. et al. Fabrication of Al2O3 aerogel-SiO2 fiber composite with enhanced thermal insulation and high heat resistance. J Porous Mater 26, 1027–1034 (2019). https://doi.org/10.1007/s10934-018-0700-6

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