| 介孔SBA-15/SiO2气凝胶硅-硅复合材料的制备和性能 |
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| 作者姓名： | 彭超豪 杨穆 栾奕 金召奎 谭僖 |
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| 作者单位： | 北京科技大学材料科学与工程学院,北京,100083;北京科技大学材料科学与工程学院,北京,100083;北京科技大学材料科学与工程学院,北京,100083;北京科技大学材料科学与工程学院,北京,100083;北京科技大学材料科学与工程学院,北京,100083 |
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| 基金项目： | 国家科技支撑计划资助项目(2013BAJ01B03)，中央高校基本科研业务费资助项目(FＲF-SD-12-004B) |
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| 摘 要： | 以有序介孔二氧化硅颗粒SBA-15为添加剂,利用酸碱两步法制备SBA-15/SiO2气凝胶硅-硅复合材料.研究SBA-15添加量对气凝胶复合材料的形成过程和性能的影响,采用扫描电镜和氮气吸附-脱附对样品的结构进行表征,并测试其力学性能和热导率.结果表明:少量有序介孔二氧化硅材料SBA-15的加入能大大缩短二氧化硅气凝胶形成时间,提高气凝胶复合材料的力学性能,并保持较低的热导率,而材料的比表面积仅略有下降.
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| 关 键 词： | 气凝胶 二氧化硅 介孔材料 制备方法 力学性能 热导率 |
| 收稿时间： | 2014-11-19 |
Preparation and properties of a mesoporous SBA-15/silica composited aerogel |
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| Affiliation: | School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China |
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| Abstract: | A mesoporous SBA-15/silica composited aerogel was prepared by a two-step acid-alkali method with SBA-15 as an additive. The effects of the amount of SBA-15 on the formation process and the performance of the eomposited aerogel were investigated. The microstructure of the composited aerogel was characterized by scanning electron microscopy and N2 adsorption-desorption isotherms, and the mechanical properties and thermal conductivity were tested. It is found that as a small amount of SBA-15 is added, the gelation time of silica greatly shortens, the mechanical properties improves, the thernlal conductivity still keeps small, while the specific surface area slightly decreases. |
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