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| Structural Changes and Thermal Stability of Fiber Reinforced Aerogel Composites |
| Received:October 26, 2019 Revised:April 15, 2015 |
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| DOI：10.7643/issn.1672-9242.2020.01.010 |
| KeyWord:fiber reinforced aerogel composites thermal stability FTIR oxidation specific surface area |
| Author | Institution |
| ZHAO Shu-yuan |
National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, Harbin Institute of Technology, Harbin , China |
| DONG Jiang-long |
National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, Harbin Institute of Technology, Harbin , China |
| SUN Xin-yang |
National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, Harbin Institute of Technology, Harbin , China |
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| Abstract: |
| The paper aims to study the structure transformation characteristics and thermal stability of the heat insulation material -nano composite at high temperature. In this work, inspection methods such as SEM, XRD, FTIR and TGA were adopted. Fiber reinforced aerogel materials from room temperature to 650 ℃ had the quality of the continuous mas loss. From room temperature to the front of the heat, its mass loss was 1.66%; the heat release began at 365 ℃ heat, and reached the peak at 398 ℃. The quality loss in the whole exothermic process was about 1.3%; the mass loss from 650 ℃ to 435 ℃ h was 1.46%. After heat treatment at 400 ℃, the sample specific surface area increased from 268 m2/g to 437 m2/g; when the heat treatment temperature of the sample reached 600 ℃, the specific surface area of the sample obviously decreased to 198 m2/g accordingly. The results showed that the silica aerogel composite maintain amorphous structure, and small amount of titanium dioxide exists in crystalline form. At 400 ℃, Si—CH3 in silica aerogel is oxidized, leading to apparent exothermic peak. Then, polycondensation reaction occurs between Si—OH, increasing the network frame strength of Si—O—Si in aerogel after heat treatment at 600 ℃. The glass fibers are better covered with silica aerogel agglomerates for the as-received samples. However, after 1 h heat treatment at 600 ℃, a large proportion of aerogel blocks are fell off from the smooth surface of fibers. The shrinkage of aerogel nanoparticles results in a decrease in the specific surface area of the composite materials. |
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