INVESTIGATION OF PORE STRUCTURE OF GLASS COMPACTS BY MEANS OF MERCURY POROSIMETRY

摘要

Silica green bodies, mainly prepared by electrophoretic deposition (EPD) are characterized by means of mercury porosimetry in order to investigate the influence of three different parameters of the deposition process. The strongest impact on mean pore size and total specific pore volume is the solids loading of the suspensions used. With increasing solid matter content both mean pore size and specific pore volume decrease. The specific pore volume is directly associated with the porosity. For the deposition voltage, the opposite is true. Here, higher voltages lead to higher values of mean pore radius and porosity. The suspension should be fully stabilized during the deposition process since then it is possible to obtain lowest porosity. The comparison of green bodies prepared by different shaping techniques indicates that samples, electrophoretically deposited, exhibit the best values regarding both small mean pore radii and small porosities.