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<p>To enhance the thermal stability of SiO<sub>2</sub> aerogels at high temperature, this study proposes a method involving the incorporation of MgAl<sub>2</sub>O<sub>4</sub> nanoparticles into SiO<sub>2</sub> aerogels to improve their high-temperature stability. By comparing the performance of MgAl<sub>2</sub>O<sub>4</sub>-SiO<sub>2</sub> aerogel with pure SiO<sub>2</sub> aerogels after heat treatment at high temperatures, it is demonstrated that the MgAl<sub>2</sub>O<sub>4</sub> nanoparticles significantly enhances the thermal stability of SiO<sub>2</sub> aerogels at elevated temperatures while almost no effect on thermal conductivity, about 0.0312 and 0.0322&#xa0;W/(m·K). The MgAl<sub>2</sub>O<sub>4</sub>-SiO<sub>2</sub> aerogels exhibit superior thermal stability and insulation performance compared to pure SiO<sub>2</sub> aerogels at temperatures exceeding 800 ℃. Notably, even after heat treatment at 1100℃, a condition that causes pure SiO<sub>2</sub> aerogels to nearly lose their porous structure, the MgAl<sub>2</sub>O<sub>4</sub>-SiO<sub>2</sub> aerogels retain a specific surface area of 81.95 m<sup>2</sup>/g and thermal conductivity of 0.0584&#xa0;W/(m·K).</p>

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Improvement of thermal stability performance of SiO2 aerogels by MgAl2O4 nanopowder

  • 期刊论文

  • 发表日期：

    2025年4月22日

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  • Wenlong Zhang,
  • Bin Wang,
  • Yuxin Xu,
  • Xiao Chen,
  • Kuibao Zhang,
  • Yan Hao

摘要

To enhance the thermal stability of SiO2 aerogels at high temperature, this study proposes a method involving the incorporation of MgAl2O4 nanoparticles into SiO2 aerogels to improve their high-temperature stability. By comparing the performance of MgAl2O4-SiO2 aerogel with pure SiO2 aerogels after heat treatment at high temperatures, it is demonstrated that the MgAl2O4 nanoparticles significantly enhances the thermal stability of SiO2 aerogels at elevated temperatures while almost no effect on thermal conductivity, about 0.0312 and 0.0322 W/(m·K). The MgAl2O4-SiO2 aerogels exhibit superior thermal stability and insulation performance compared to pure SiO2 aerogels at temperatures exceeding 800 ℃. Notably, even after heat treatment at 1100℃, a condition that causes pure SiO2 aerogels to nearly lose their porous structure, the MgAl2O4-SiO2 aerogels retain a specific surface area of 81.95 m2/g and thermal conductivity of 0.0584 W/(m·K).