Chem. J. Chinese Universities ›› 2019, Vol. 40 ›› Issue (12): 2566.doi: 10.7503/cjcu20190369

• Physical Chemistry • Previous Articles     Next Articles

Synthesis and Reusable Properties of Robust Al2O3-SiO2 Aerogel

Enshuang ZHANG,Hongyan HUANG,Tao LIU,Lijuan HE,Hui GUO,Wenjing LI(),Fan ZHANG,Jieying YANG,Hao ZHANG,Yingmin ZHAO   

  1. Aerospace Institute of Advanced Material & Processing Technology, Beijing 100074, China
  • Received:2019-07-03 Online:2019-12-04 Published:2019-12-04
  • Contact: Wenjing LI E-mail:ht3lwj@126.com

Abstract:

An Al2O3-SiO2 composite aerogel with robust mechanical property was constructed by nanocrystalline assembly. Due to different heat resistance of Al2O3 and SiO2, robust Al2O3-SiO2 aerogel can be prepared by controlling treating temperature. The effects of Al/Si molar ratio and treating temperature on microstructure were studied and the best experiment condition was obtained. The aerogel gets densities of 0.25 g/cm 3, specific surface of 123.9 m 2/g, thermal coefficient of 0.029 W·m -1·K -1 fabricated in the best experiment condition. The test result showed that the microstructures of aerogel unchanged in extreme conditions such as water immersion and freeze. And thermal coefficient of aerogel still remains 0.029 W·m -1·K -1 after 10 cycles heat treatment(800 ℃, 30 min). The robust Al2O3-SiO2 aerogel is expected to solve the problem that thermal insulation material cannot be used repeatedly in future aerospace vehicles and near space vehicles. This method prove a new idea for new aerogel insulation materials.

Key words: Aerospace vehicle, Nanopores, Aerogel, Reusable property, Thermal insulation material

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