Research Progress on High-temperature Resistance of Al2O3-SiO2 Aerogels

HU Xinyu; ZHANG Yu; WU Yongpeng; DING Xingxing; LIN Yu; HE Bin; CUI Yangwen; WANG Zhenghui

doi:10.7643/ issn.1672-9242.2026.02.015

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Equipment Environmental Engineering ›› 2026, Vol. 23 ›› Issue (2) : 130-139. DOI: 10.7643/ issn.1672-9242.2026.02.015

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Research Progress on High-temperature Resistance of Al₂O₃-SiO₂ Aerogels

HU Xinyu¹, ZHANG Yu¹, WU Yongpeng^1,2, DING Xingxing^1,2,*, LIN Yu^1,2, HE Bin^1,2, CUI Yangwen^1,2, WANG Zhenghui²

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Abstract

This article introduces the research progress on the high-temperature resistance of Al₂O₃-SiO₂ aerogels to provide research ideas for improving the high-temperature performance of Al₂O₃-SiO₂ aerogels. Based on the sol-gel methods, the effects of sol, gel, aging, and drying processes on the properties of Al₂O₃-SiO₂ aerogel composites are introduced. Methods for improving the high-temperature performance of Al₂O₃-SiO₂ aerogels are proposed by enhancing the compatibility among transition metals, rare earth elements, high-temperature resistant particles, dispersed fibers, fiber preforms and Al₂O₃-SiO₂ aerogels. By introducing particles such as zirconium, titanium, yttrium, silicon carbide (SiC), and carbon nanotubes (CNTs), the pore structure and microstructure of Al₂O₃-SiO₂ aerogels are effectively improved, high-temperature phase changes or shrinkage are suppressed, and the high-temperature thermal insulation performance of Al₂O₃-SiO₂aerogels is enhanced. The mechanical properties and high-temperature thermal insulation performance of Al₂O₃-SiO₂ aerogels are simultaneously improved by using dispersed fibers and fiber preform reinforcement methods, resulting in fiber-reinforced Al₂O₃-SiO₂ aerogel composites with excellent overall performance. In response to issues such as the limited high-temperature application scenarios of Al₂O₃-SiO₂ aerogels, the core path to improving the high-temperature performance of silica-alumina aerogels is further clarified.

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aerogel / Al₂O₃-SiO₂ / alumina / silica / composites / high temperature resistance / doping modification / fiber reinforcement

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HU Xinyu, ZHANG Yu, WU Yongpeng, DING Xingxing, LIN Yu, HE Bin, CUI Yangwen, WANG Zhenghui. Research Progress on High-temperature Resistance of Al₂O₃-SiO₂ Aerogels[J]. Equipment Environmental Engineering. 2026, 23(2): 130-139 https://doi.org/10.7643/ issn.1672-9242.2026.02.015

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