Controllable Preparation and Performance Regulation of Aligned Fiber-reinforced Aerogels Composites for Super-thermal Insulation
Ordered fiber-reinforced aerogel composites were successfully synthesized by impregnating 4 layer of aligned glass fibers in silica sol through 6 specified laminated designs. The SEM and FFT analysis was carried out to evaluate the fiber alignment in the aerogel composites. The effects of the fiber alignments and the laminated structures on the thermal conductivity and the compressive and bending strength of the aerogel composites were studied. The results showed that the reinforced fibers exhibited high alignment and the reinforced nanoporous aerogel composites had a low thermal conductivity of 0.023~0.028 W·m-1·K-1. The reinforced fibers significantly improved both the compressive strength and the bending strength of the aerogel composites. Moreover, the fiber alignments and the laminated design had a significant effect on the mechanical property. The aerogel composites with a smaller orthogonal number between the adjacent fiber layers had the higher compressive strength. The fiber alignments of the aerogel composites had inverse effects on the bending strength at L and T directions. The aerogel composites had higher modulus as their fiber alignment was consistent to the bending directions.
Super-thermal insulation Thermal conductivity Aerogels Aligned-Fibers
Huijun Wu Yundan Liao Yunfei Ding Shuai Yin
School of Civil Engineering, Guangzhou University, Guangzhou 510006, China Guangdong Provincial Key School of Civil Engineering, Guangzhou University, Guangzhou 510006, China
国际会议
4th International Symposium on Heat Transfer and Energy Conservation(第四届传热与节能国际研讨会 ISHTEC2012)
广州
英文
1-4
2012-01-06（万方平台首次上网日期，不代表论文的发表时间）