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Transactions of the INDIAN CERAMIC SOCIETY   Vol. 57  1998
Effect of Water Used During Gelation on the Phase Transformation of Al20 3-Si02 Gel
M. H. DAFADAR, s. DAS AND A. K. CHAKRA VORTY
Pages : 121-126
DOI : 10.1080/0371750X.1998.10804849
Abstract
Two kinds of AI20 3-Si02 gels have been synthesized out of aluminium nitrate and tetraethyl orthosilicate. First kind of gel, prepared in excess of hydrolysis agent, e.g. water, does not exhibit 980C exotherm due to formation of a spinel phase at an earlier temperature. Contrary to the first kind, the second kind of gel prepared in absolute alcohol only and in the absence of moisture develops considerable quantity of mullite directly at 980C with an exotherm in DT A. Comparative phase transformation sequences by X-ray technique reveal corundum prior to mullitization in first kind of gel. This explains the development of diphasic character of the gel because of the presence of large quantity of water during gelation process.
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