Structure and thermal evaluation of mullite aerogels

Gels with mullite composition are prepared from pseudoboehmite sol and tetramethoxysilane and then converted to aerogels using methanol or CO sub 2 supercritical drying. Structure of aerogels depends on nature of solvent used to perform hypercritical solvent evacuation. Thermal evolution of a monoli...

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Bibliographic Details
Published in:Journal of materials science 1991-01, Vol.26 (22), p.5979-5984
Main Authors: Cluzel, F, Larnac, G, Phalippou, J
Format: Article
Language:English
Online Access:Get full text
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Summary:Gels with mullite composition are prepared from pseudoboehmite sol and tetramethoxysilane and then converted to aerogels using methanol or CO sub 2 supercritical drying. Structure of aerogels depends on nature of solvent used to perform hypercritical solvent evacuation. Thermal evolution of a monolithic methanol-evacuated sample leads to crack-free ceramic with an apparent density of 1.1 that does not evolve when heat-treated at < 1200 degrees C. 30 refs.
ISSN:0022-2461