Abstract
The drying kinetics of the wet alumina pieces prepared by pressure filtration of ultrafine (average size 0.16μm) alumina powder in various dispersion conditions were studied. The effects of acidic dispersant and two drying control chemicals (DCC) were investigated by studying the change of contact angle, surface potential, green properties and drying kinetics. By appropriately controlling temperature and humidity, the drying kinetics can be divided into two stages, starting from an interfacial evaporation, then ending with a vapor diffusion through a porous matrix. The drying rate of the initial stage of the drying process is linearly dependent upon drying time, which will then change to a parabolic decrease behavior controlled by a diffusion-limited mechanism. These kinetic phenomena can be described by three parameters, including mass loss rate, J, mass transport coefficient, k, and diffusion coefficient, D. In association with the analysis of these kinetic parameters, the effects of drying with the change of temperature and relative humidity will be clarified. The results show that the kinetics is greatly improved and the drying can be reduced to only one step.
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