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Preparation of heat-resistant alumina aerogels

Published online by Cambridge University Press:  03 March 2011

Yasuyuki Mizushima  and
Makoto Hori
Yasuyuki Mizushima
Affiliation:
Colloid Research Institute, 350-1 Ogura, Yahatahigashi-ku, Kitakyushu 805, Japan
Makoto Hori
Affiliation:
Colloid Research Institute, 350-1 Ogura, Yahatahigashi-ku, Kitakyushu 805, Japan
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Abstract

Alumina aerogels were prepared using supercritical drying methods, and their thermal properties were examined. The effects of several additives to the alumina aerogel and supercritical drying methods were examined in order to improve heat resistance. Silica, phosphoric oxide, barium oxide, lanthanum oxide, and SiC whisker were effective for maintaining a high specific surface area of the alumina aerogel at a temperature over 1200 °C. Silica was found to be the most effective among the additives. The addition of 10 mol % silica resulted in an alumina aerogel with the highest specific surface area, 114.3 m2/g at 1200 °C, and increased the transformation temperature to α alumina. Barium oxide and lanthanum oxide formed smaller crystals within the alumina, compared with those of alumina alone. SiC whisker caused many cracks in the alumina aerogel. When supercritically dried, the alumina aerogel was strengthened by treatment at higher temperature and pressure.

Type
Articles
Information
Journal of Materials Research , Volume 8 , Issue 11 , November 1993 , pp. 2993 - 2999
Copyright
Copyright © Materials Research Society 1993

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