Mechanical Property of Silica Aerogel Fibers Composite Insulation

作者：Zhang Zhihua^*; Sun Lijun; Wei XiaoQing; Wang Wenqin; Shen Jun; Ni Xingyuan; Wu Guang ming; Zhou Bin

来源：Rare Metal Materials and Engineering, 2012, 41: 415-418.

• silica aerogel
• mullite fibers
• sol-gel
• mechanical property
• thermal conductivity

Nano-porous silica aerogels doped with mullite fibers were prepared via sol-gel progress with polyethoxydisiloxanes (E-40) as silicon source. The mullite fibers were distributed inside the silica aerogels to act as a supporting skeleton material, which could increase the mechanical property. The morphology and pore structure of silica aerogels doped with fibers were characterized by SEM. The mechanical properties and the thermal conductivities of silica aerogel-fiber composites were determined by a dynamic mechanical analyzer and a hot disk device. The silica aerogels doped with fibers still maintain a spongy porous structure and high porosity, even after the heat treatment. The mechanical strength of the silica aerogels increases from 1.5x10(5) to 3.8x10(6) Pa. With the rising of the heat treatment temperature, the mechanical strength of the composites would be increased to 10-20 times. The thermal conductivity of silica aerogels is 0.023 W/(m.K) at room temperature in air. The thermal conductivity of the composites is 0.032 W/(m.K) after 1000 degrees C and is still recognized as the preferred super-insulation material.

• 出版日期2012-11
• 单位同济大学