Preparation and Characterization of Nanoporous Super Insulation Materials Reinforced with Aluminum Silicate Fiber

To solve the low strength problem of silica aerogel,the nanoporous super insulation materials,reinforced with aluminum silicate fiber,were prepared from TEOS through sol-gel process and supercritical drying technology.Their bulk densities were 74-189 kg·m-3,and their thermal conductivity and pore diameter distribution were measured by using the transient hot-strip and BET methods respectively.The test results indicated that their thermal conductivity is 25.3-30.5 mW·(m·K)-1 at normal temperature and pressure,the thermal conductivity of the typical sample(103 kg·m-3) is 93.78 mW·(m·K)-1 at 723K and the pore diameter of it is mainly in the range of 10-20 nm.Additionally,these materials have adequate strength compared with silica aerogel,so they can be used in project and have wide application.