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<p>Silica aerogels (SA) are considered potential thermal insulation materials owing to their low thermal conductivity. However, the poor mechanical properties of SA limit their utilization in thermal insulation fields. To solve this, silica aerogel composites (ASF/SA) were fabricated using methyltriethoxysilane (MTES) as silicon source and aluminum silicate fiber (ASF) as the reinforcement via ambient pressure drying. The synthesis process avoids extra surface modification and solvent replacement steps. With this fast and simple method, the influence of four important preparative parameters on the sol-gel polymerization of aerogels has been systematically studied. The obtained ASF/SA with 1–5 wt% fiber content exhibited low thermal conductivity of 0.037–0.042&#xa0;W·m<sup>− 1</sup>·K<sup>− 1</sup> with density of 0.23–0.25&#xa0;g·cm<sup>−</sup>³. ASF/SA composites have good mechanical properties with the compression stress of 1.79–2.14&#xa0;MPa and the compression modulus of 0.77–1.13&#xa0;MPa under 60% deformation. In addition, ASF/SA exhibited excellent thermal stability with a residual weight of 92.04% at 800 ℃ and hydrophobicity with contact angles ranging from 145° to 158°. Thus, these excellent features indicate ASF/SA composite is further expected to have broad prospects in various thermal insulation fields.</p>

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A facile and green preparation of aluminum silicate fiber reinforced silica aerogel composites for thermal insulation

  • 期刊论文

  • 发表日期：

    2025年2月10日

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  • Tao Deng,
  • Yufeng Li,
  • Chongwen Jiang,
  • Le Xie

摘要

Silica aerogels (SA) are considered potential thermal insulation materials owing to their low thermal conductivity. However, the poor mechanical properties of SA limit their utilization in thermal insulation fields. To solve this, silica aerogel composites (ASF/SA) were fabricated using methyltriethoxysilane (MTES) as silicon source and aluminum silicate fiber (ASF) as the reinforcement via ambient pressure drying. The synthesis process avoids extra surface modification and solvent replacement steps. With this fast and simple method, the influence of four important preparative parameters on the sol-gel polymerization of aerogels has been systematically studied. The obtained ASF/SA with 1–5 wt% fiber content exhibited low thermal conductivity of 0.037–0.042 W·m− 1·K− 1 with density of 0.23–0.25 g·cm−³. ASF/SA composites have good mechanical properties with the compression stress of 1.79–2.14 MPa and the compression modulus of 0.77–1.13 MPa under 60% deformation. In addition, ASF/SA exhibited excellent thermal stability with a residual weight of 92.04% at 800 ℃ and hydrophobicity with contact angles ranging from 145° to 158°. Thus, these excellent features indicate ASF/SA composite is further expected to have broad prospects in various thermal insulation fields.