SU Hui WU Yefan

（Laboratory of New Energy Sources, Jingdezhen Ceramic Institute, Jingdezhen, Jiangxi 333001）

Abstract: Many issues of film drying for aqueous tape casting are to be accounted for. For example, the simultaneous transfer of heat, mass and momentum in solids is beyond the description of mathematics. The drying process of tape-cast films can be divided into a stage of drying at a constant speed and a stage of evaporating at a declining speed. In the past, due to the limitations in experimental technology, some drying mechanisms were not fully understood. There were even off-limits and fallacies in drying kinetics. As the drying mechanism is very complex and the present study was insufficient, the kinetic data of drying came from laboratory tests. The research on the relation between structure and properties can expand the understanding of the drying process: the characterization of the film by electron microscopy can reveal the change of microstructure and moisture component in it; the TGA technology associates the change in humidity of the film with temperature, thus providing a theoretical basis for the design of drying process; solid-state NMR spectroscopy can be used to measure the water-proton spin-lattice relaxation time of the moisture and to semi- antitatively calculate the ratios of both the removable hydration and free water and the unremovable bound water.

Key words: aqueous tape casting; film; binder; drying rate; drying characteristics