Abstract
Abstract Alumina aerogels containing silicon carbide (SiC) whiskers were prepared using supercritical drying methods, and their thermal properties were examined. The effects of the SiC whiskers on the alumina aerogel were evaluated. The composite aerogel prepared by the supercritical extraction showed a higher specific surface area than an alumina aerogel without whiskers. Many cracks were observed in the composite aerogel fired at 1200 and 1400°C for 5 h. This is due to the difference of thermal shrinkage between the alumina aerogel and the SiC whiskers. The specific surface area of the composite aerogel was 26·1 m 2 /g, and that of the aerogel without whiskers 5·6 m 2 /g. The same effect was observed in a composite aerogel prepared by a different supercritical drying method at a higher temperature and pressure.
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