Rigid silica xerogel/alumina fiber composites and their thermal insulation properties
Rigid silica xerogel/alumina fiber composites and their thermal insulation properties
复制标题
刚性二氧化硅干凝胶/氧化铝纤维复合材料及其隔热性能
DOI：
10.1007/s10934-018-0711-3
复制
发表时间：
2019-08-01
影响因子：
2.6
通讯作者：
Hu, Zijun
中科院分区：
文献类型：
--
作者：
Li, Junning;Wu, Wenjun;Hu, Zijun
采用一种经济有效的常压干燥方法成功制备了力学性能良好的二氧化硅干凝胶/氧化铝纤维复合材料。微观结构研究表明，氧化铝纤维作为增强体嵌入到二氧化硅干凝胶基体中，大大提高了复合材料的强度。当氧化铝纤维含量增加到4.0%时，复合材料的抗压强度和弯曲强度分别为0.96 MPa和2.53 MPa，而室温热导率在0.051 ~ 0.059 W/mK之间略有变化。如TG-DSC结果所示，该复合物是疏水的并且保持防水性直到300 °C。在800 °C下加热25 min后，复合材料仍保持结构完整，表现出良好的耐热性能。上述特性表明，该复合材料作为保温材料在节能领域具有很大的应用潜力。
Mechanically robust silica xerogel/alumina fiber composites were successfully prepared by a cost-effective ambient pressure drying route. Microstructure investigation shows that the alumina fibers embed into the silica xerogel matrix as reinforcements, which improves the strength of the composites greatly. As the alumina fibers volume increases to 4.0%, the compressive and flexural strength value of the composite is 0.96 MPa and 2.53 MPa, while the thermal conductivity at room temperature slightly changes between 0.051 and 0.059 W/mK. The composite is hydrophobic and keeps water repellent until 300 °C as shown by the TG–DSC result. After being heated at 800 °C for 25 min, the composite remains structurally intact demonstrated good thermal resistant property. The above characteristics indicate that the as prepared composite has great potential application as thermal insulation material in energy-saving area.