Abstract
Mullite formation by reaction at high temperature of kaolinite with two types of alumina (aluminium hydroxide gel and reactive alumina) was investigated in the presence of three types of additives containing monovalent, divalent and trivalent cations i.e, MgO, Cr2O3 and TiO2. Role of these additives on product development was studied by bulk density, apparent porosity, true density, compressive strength measurements and XRD analysis of the sintered compacts. It was observed aluminium hydroxide gel containing samples to densify better and to contain more mullite after firing. Among the additives, MgO was found to influence the densification process to the maximum extent.
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