耐火材料 ›› 2025, Vol. 59 ›› Issue (2): 133-137.DOI: 10.3969/j.issn.1001-1935.2025.02.008

• 节能降耗 • 上一篇    下一篇

Fe2O3-SiO2复合气凝胶材料的制备及耐温性能

侯建业1,2), 张忠伦1,2), 付晓晴1,2), 王明铭2,3), 刘振森1,2,3)   

  1. 1)中建材科创新技术研究院(山东)有限公司 山东枣庄 277100
    2)山东省无机功能材料与智能制造重点实验室 山东枣庄 277100
    3)中国建筑材料科学研究总院有限公司 北京 100024
  • 收稿日期:2024-07-25 出版日期:2025-04-15 发布日期:2025-04-14
  • 通讯作者: 张忠伦,男,1976年生,博士,教授级高级工程师。E-mail:kyc3571@126.com
  • 作者简介:侯建业:男,1994年生,硕士,工程师。E-mail:1010125814@qq.com
  • 基金资助:
    国家重点研发计划(2023YFB3812300)。

Preparation and high-temperature resistance of Fe2O3-SiO2 composite aerogel materials

Hou Jianye, Zhang Zhonglun, Fu Xiaoqing, Wang Mingming, Liu Zhensen   

  1. First author’s address:China National Building Material Technology Innovation Academy (Shandong) Co.,Ltd.,Zaozhuang 277100,Shandong,China
  • Received:2024-07-25 Online:2025-04-15 Published:2025-04-14

摘要: 为了提高SiO2气凝胶在高温下的隔热性能,以溶胶-凝胶两步法制备SiO2前驱体溶液,将遮光剂Fe2O3粉末添加到SiO2前驱体溶液中,结合二氧化碳超临界干燥技术,制备出Fe2O3-SiO2复合气凝胶,探究Fe2O3遮光剂的添加(Fe2O3外加质量分数分别为0、0.2%、0.5%、1.0%和3.0%)对气凝胶的影响。结果表明:1)Fe2O3添加到气凝胶中,不会影响气凝胶的形貌;Fe2O3的添加抑制了材料因高温造成的质量损失,提高了复合材料在高温下的稳定性。2)温度低于800 ℃时,Fe2O3外加量为0.5%(w)的试样,其热导率最低,隔热性能最好;而在800~1 000 ℃温度下,Fe2O3外加量为1%(w)的试样,其热导率最低,仍保持较好的纳米多孔结构。3)通过控制Fe2O3外加量,可以得到适用于不同温度段的复合气凝胶。

关键词: Fe2O3-SiO2复合气凝胶, 遮光剂, 孔结构, 热导率, 高温性能

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 Fe2O3 extra-addition on the aerogels were investigated.The results show that:(1)Fe2O3 doping does not alter the aerogel morphology;Fe2O3 suppresses the mass loss caused by high temperatures and enhances the high-temperature stability of the composites;(2)below 800 ℃,the aerogel with 0.5% Fe2O3 exhibits the lowest thermal conductivity and the best insulation performance;between 800-1 000 ℃,the aerogel with 1% Fe2O3 performs 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 aerogel, opacifier, pore structure, thermal conductivity, high temperature performance

中图分类号: