Effects of grains morphology on the final properties of traditional ceramic materials


In this paper, the effects of grains morphology on sintering behaviour and final microstructure of a porcelain tile body were studied by means of optical dilatometry, heating microscopy and SEM investigations. Two samples made up of the same porcelain tile body composition, formed with the same specific pressure and subjected to the same firing cycle, but obtained using grains with different morphologies were analysed. The first sample was obtained by pressing spray-dried grains showing the typical hollow sphere shape, the second one was prepared with dense spherical grains obtained by wet regranulation from the original powders.