Abstract
We studied the effect of a corundum and gibbsite on the reaction process andphysical properties of cordierite ceramics. The results were as follows:
(1) In the fired bodies obtained from the kaolin-talc-gibbsite mixture, gibbsite attributed to the cordierite formation without rearrangement into corundum in the firing process.
(2) In the case of small particle size of ground mixture, apparent porosity of bodies fired at 1200°C were 0% in both case of kaolin-talc-corundum mixture and kaolin-talc-gibbsite mixture.
(3) The bending strength and thermal expansion coefficient of bodies fired at1300°C obtained from both mixtures increased with decrease in particle size ofground mixtures. The optimum particle size of kaolin-talc-gibbsite mixture wasabout 0.4μm, because over grinding mixture caused a decrease in cordieritecontent of body fired at 1300°C.
