Abstract
Using the isothermal method, the densification process of the quartz-feldspar-kaolinite system, representative of ceramics used for building construction, was investigated at various packing ratios (65-69%). The Arrhenius equation can be established between the temperature and the time necessary for densification before the vitrification point. In addition, the particles show a rhombic dodecahedron orientation, as described by Sallam et al., irrespective of the packing ratio at forming. A linear relation can be established between the logarithm of the packing ratio and the logarithms of the gradient and intercept of the Arrhenius equation. The apparent activation energy necessary for vitrification is 104-117kcal/mol, and the apparent activation energy decreased with increasing packing ratio. This indicates a possibility that the body possesses a specific coefficient for densification which is extremely important industrially.
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