Characterization of Porosity in Porcelain-Bonded Porous Alumina Ceramics

A water removal method was used to determine pore sizes in highly porous large-pore-size specimens. The maximum, minimum, and equivalent pore sizes, as well as complete size distributions (number of pores vs pore sizes), were obtained. The results agree with those obtained using a mercury porosimeter. Characterizing parameters such as permeable porosity, labyrinth factor, and structure factor were estimated from the water removal porosimeter data. Electrolytic resistance was measured to determine the tortuosity and inert porosity. A physical meaning of Archie's law which correlates the formation resistivity factor with porosity is also given. Sonic Young's and shear moduli depended on both the porosity and particle sizes. The Young's modulus was linearly related to the modulus of rupture.