Preparation and High-temperature Resistance of Fe2O3-SiO2 Composite Aerogel Materials

doi:10.19691/j.cnki.1004-4493.2025.04.009

China's Refractories ›› 2025, Vol. 34 ›› Issue (4): 42-46.DOI: 10.19691/j.cnki.1004-4493.2025.04.009

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Preparation and High-temperature Resistance of Fe₂O₃-SiO₂ Composite Aerogel Materials

HOU Jianye^1,2, ZHANG Zhonglun^1,2,3,*, FU Xiaoqing^1,2, WANG Mingming^2,3, LIU Zhensen^1,2,3

1 CNBM Technology Innovation Academy (Shandong) Co., Ltd., Zaozhuang 277100, China;
2 Shandong Key Laboratory of Inorganic Functional Materials and Intelligent Manufacture, Zaozhuang 277100, China;
3 CBMA Co., Ltd., Beijing 100024, China

Online:2025-12-15 Published:2026-01-04
Contact: *e-mail: kyc3571@126.com
About author:Hou Jianye is an intermediate engineer at CNBM Technology Innovation Academy (Shandong) Co., Ltd. He is currently primarily engaged in research and development in the field of aerogel materials.

Abstract

Abstract: To improve the thermal insulation performance of SiO₂ aerogels at high temperatures, SiO₂ precursor solutions were prepared via a sol-gel two-step method. Fe₂O₃ powder was extra added as an opacifier to the SiO₂ precursor solutions with mass fractions of 0, 0.2%, 0.5%, 1.0%, and 3.0%; and Fe₂O₃-SiO₂ composite aerogels were fabricated using CO₂ supercritical drying technology. The effects of the Fe₂O₃ extra addition on the aerogels were investigated. The results show that: (1) Fe₂O₃doping does not alter the aerogel morphology; Fe₂O₃ suppresses the mass loss at high temperatures and enhances the high-temperature stability of the composite; (2) below 800 °C, the aerogel with 0.5% Fe₂O₃ exhibits the lowest thermal conductivity and the best thermal insulation performance; at 800-1 000 °C, the aerogel with 1% Fe₂O₃ exhibits the lowest thermal conductivity and a good nanoporous structure; (3) by adjusting the Fe₂O₃ extra addition, composite aerogels suitable for different temperature ranges can be tailored.

Key words: Fe₂O₃-SiO₂ composite aerogels, opacifier, pore structure, thermal conductivity, high temperature performance

HOU Jianye, ZHANG Zhonglun, FU Xiaoqing, WANG Mingming, LIU Zhensen. Preparation and High-temperature Resistance of Fe₂O₃-SiO₂ Composite Aerogel Materials[J]. China's Refractories, 2025, 34(4): 42-46.

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Preparation and High-temperature Resistance of Fe₂O₃-SiO₂ Composite Aerogel Materials

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