ABSTRACT

This paper investigates the effect of silica aerogels on mechanical (flexural and impact), non-destructive and thermal properties of glass/epoxy composites. Silica aerogels were mixed with epoxy at various volume fractions (1% and 3%) and infused with glass fabrics to produce composite laminates. Flexural tests indicated that the addition of aerogels increased the flexural strength of composites at the warp direction. Low impact energy (10–30 J) test results exhibited that impact force and energy absorption of composites were slightly increased . Higher energy (100 J) caused more severe damages and the effect of aerogels was more obvious. The thermogravimetric analysis revealed that addition of aerogels increased the thermostability. Generally, addition 1% of aerogel provides more improvement on mechanical properties and thermal stability compared to addition 3%. Although there is not a linear relationship between aerogel content and thermal conductivity, samples with 3% aerogel exhibited lower thermal conductivity values than other samples.

摘要

本文研究了二氧化硅气凝胶对玻璃/环氧树脂复合材料的机械（弯曲和冲击）、无损和热性能的影响。二氧化硅气凝胶与不同体积分数（1% 和 3%）的环氧树脂混合，并注入玻璃织物以生产复合层压板。弯曲试验表明，气凝胶的加入增加了复合材料在经向的弯曲强度。低冲击能量（10-30 J）测试结果表明复合材料的冲击力和能量吸收略有增加。更高的能量（100 J）造成的损伤更严重，气凝胶的效果更明显。热重分析表明，气凝胶的添加增加了热稳定性。一般来说，与添加 3% 的气凝胶相比，添加 1% 的气凝胶可提供更多的机械性能和热稳定性改进。尽管气凝胶含量与导热系数之间没有线性关系，但含有 3% 气凝胶的样品的导热系数值低于其他样品。