ZrO_2-SiO_2复合气凝胶的制备及其热稳定性研究

Preparation and Thermal Stability of ZrO_2-SiO_2 Composite Aerogels

为了改善纯ZrO_2气凝胶的高温稳定性,本研究以TEOS为硅源,以硝酸氧锆为锆源,通过滴加环氧丙烷,制备了ZrO_2-SiO_2复合气凝胶,探索了锆硅比例和热处理温度对复合气凝胶结构和性能的影响,结果表明,当锆硅比例为1:1时,制备的复合气凝胶比表面积最大,为551.7 m2/g;1000°C热处理后的比表面积为239.3 m2/g,1200°C热处理后的比表面积为89.5m2/g。与纯ZrO_2气凝胶相比,本研究所制得的ZrO_2-SiO_2复合气凝胶具有更好的热稳定性。

In order to improve the high temperature structural stability of pure zirconia aerogels, ZrO_2-SiO_2 composite aerogels were prepared by dropping propylene oxide, with TEOS as the silicon source and zirconyl nitrate as the zirconium source. This paper explored the effects of the molar ratio of zirconium and silicon and heat treatment temperature on the structure and properties of the prepared ZrO_2-SiO_2 composite aerogels. The results showed that, when the molar ratio of zirconium and silicon was 1：1, the prepared composite aerogels had the highest specific surface area of 551.7 m2/g. After being heat-treated at 1200°C, the specific surface area of composite aerogels decreased to 89.5 m^2/g. Compared to the pure ZrO_2 aerogels, the ZrO_2-SiO_2 composite aerogels had better thermal stability.