Liu Lin, Wang Xiaodong, Zhang Ze, Shi Yixin, Zhao Yicheng, Shen Shiqi, Yao Xiandong, Shen Jun
Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, School of Physics Science and Engineering, Tongji University, Shanghai 200092, China.
College of Chemistry and Chemical Engineering, Shaoxing University, Shaoxing 312000, China.
Gels. 2022 Jun 15;8(6):380. doi: 10.3390/gels8060380.
Alumina aerogels are considered to have good application prospects in the high-temperature field. In this study, monolithic mullite fiber-reinforced alumina aerogels with excellent mechanical and thermal properties were synthesized via a facile method without the use of any chelating agents. This method successfully avoids the introduction of impurities during the use of catalysts and chelating agents while greatly reducing gelation time, and thus helps mullite fibers to uniformly disperse in the sol. The compressive stress at 80% strain of the obtained mullite fiber-reinforced alumina aerogels was as high as 16.04 MPa-426% higher than that of the alumina aerogel without the addition of mullite fibers. Regarding thermal properties, the shrinkage of the mullite fiber-reinforced alumina aerogels (AM) samples was less than 1% after heat treatment at 1300 °C for 2 h. Furthermore, the rear-surface temperature of the AM samples burned by a butane blow torch was only 68 °C. These outstanding properties make AM samples promising for application in thermal insulation materials in high-temperature fields such as aerospace and industrial thermal protection in the future.
氧化铝气凝胶被认为在高温领域具有良好的应用前景。在本研究中，通过一种简便的方法合成了具有优异机械性能和热性能的整体式莫来石纤维增强氧化铝气凝胶，该方法不使用任何螯合剂。这种方法成功避免了在使用催化剂和螯合剂过程中引入杂质，同时大大缩短了凝胶化时间，从而有助于莫来石纤维在溶胶中均匀分散。所得莫来石纤维增强氧化铝气凝胶在80%应变下的压缩应力高达16.04 MPa，比未添加莫来石纤维的氧化铝气凝胶高426%。在热性能方面，莫来石纤维增强氧化铝气凝胶（AM）样品在1300℃热处理2小时后的收缩率小于1%。此外，用丁烷喷枪燃烧的AM样品背面温度仅为68℃。这些优异的性能使得AM样品在未来航空航天和工业热防护等高温领域的隔热材料应用中具有广阔前景。
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