Conventional Brick Clays as a Challenge of Materials Science - New Explanation of Drying Sensitivities

In this research 13 drilling production, up to 18 m depth of "Lenti" conventional brick clay deposit were examined both on material, mineralogical structures and compositions as well as on technological properties. During the examination the mineralogical and chemical composition of the different layers were determined and tested on physical and technological properties. The authors have found that the grain size distributions and the volumes of X-ray amorphous submicron and nanoparticles of these conventional brick clays do not influence on the dry sensitivity of the extruded and formed green products of ceramics roof tiles. The authors have found also a strong correlation between the amount of X-ray amorphous nanoparticles of the raw materials and the bending strengths of the sintered ceramic rods. The higher the amount (proportion) of submicron and nanoparticles in the used clay minerals, the greater the bending strength of the produced sintered ceramics.