Abstract
A monolithic colloidal gel of mullite composition, prepared from SiO 2 and boehmite sols, was sintered under isothermal conditions. The sintering process was studied by dilatometry, thermogravimetric analysis, bulk density measurements and discontinuous shrinkage measurements. The silica component of stoichiometric colloidal mullite gel prevented crystallization of α-Al 2O 3 in the system. The initial rapid part of the sintering is controlled by the alumina phase and it is not a viscous sintering process in the sense of Scherer's viscous sintering model. The final part of sintering, above approximately 80% of the theoretical density, is controlled by the silica component of the gel and agrees very well with the Scherer model.
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