Characterization of phase transformation and thermal behavior of Sedlecky Kaolin

Abstract

The authors have examined how the properties are changing using different sintering temperature based on the kaolin. Kaolin powder and a mixture of kaolin and 10 m% alumina was made and measured their sintering properties (TG, DTG, DTA, height). Pellets were compacted from the powders and sintered at 450 °C, 575 °C, 775 °C, 870 °C, 1100 °C temperature. The volume shrinkage, sintering weight losses, microstructure and phase composition of sintered specimens were investigated. In the case of sintering at 450 °C the volume of the samples increased; with a further increase of the temperature a continuous volume decrease can be observed.