Isothermal Dilatometric Study of Sintering in Kaolin |
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Authors: | Ján Ondru?ka Anton Trník Martin Keppert Igor Medved’ Libor Vozár |
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Affiliation: | 1. Department of Physics, Constantine the Philosopher University, A. Hlinku 1, 94974, Nitra, Slovakia 2. Department of Materials Engineering and Chemistry, Faculty of Civil Engineering, Czech Technical University, Thákurova 7, 16629, Prague, Czech Republic
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Abstract: | Solid-state sintering for kaolin samples was studied by dilatometric measurements in the isothermal regime in the temperature range from 600 °C to 1100 °C. The relative expansion was measured for a period of 10h. For the temperatures up to 850 °C, we observed only a small shrinkage (less than 0.5 %), most of which took place within the first 3h of the measurements. For the temperatures above 850 °C, a significant shrinkage occurred for the whole measured time interval and reached up to 2.7 %. Anomalous behavior—a decrease in the shrinkage with the temperature—was observed in the range from 700 °C to 850 °C. The dilatometric measurements are supplemented by porosity distribution measurements. The standard spherical-grains microscopic model was applied to determine that for the initial stages of the sintering process, grain boundary diffusion was the dominant mechanism at lower temperatures (600 °C to 850 °C), whereas lattice diffusion was dominant at higher temperatures (900 °C, 1050 °C, and 1100 °C). |
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