氧化错掺杂铝硅复合气凝胶耐热性能研究.

Zirconia aerogels were prepared by sol-gel method and supercritical ethanol drying using zirconium butoxide as zirconium source, and Zr-Al and Zr-Si composite aerogels were prepared by doping aluminum sec-butanol and dimethyldiethoxy silane. FESEM, XRD, FT-TR, specific surface area and pore structure analyzer were used to characterize the morphology, size and structure of the aerogels. The results showed that the density of aerogel decreased from ().393 g/cm1' to ().1 47 g/cm1', the specific surface area of aerogel increased from 1 78/g to 394 m2/g, and the temperature resistance also improved significantly. FESEM photos showed that the morphology of aerogel doped with Al and Si changed little after heat treatment. After heat treatment at 900C for 4h, the specific surface area of Zr-Si composite aerogel was still 1 68 mJ/g, and there was no phase transition of Zr()2. After doping aluminum and silicon elements, zirconia aerogel can effectively inhibit the phase transformation of zirconia and improve its temperature resistance. [ABSTRACT FROM AUTHOR]