Abstract
The properties of the porous materials, such as permeability, moisture adsorption, water absorption and durability for slag-action, are affected by the pore structure. In this study, the pore size distribution of the accessible pore of the sintered MgO was measured with the mercury pressure porosimeter and the through pore was measured with the back diffusion method. The validity of these methods of pore size distribution measurement especially for the back diffusion method was discussed. The slip flow component (K0) of the permeability coefficient calculated from the pore size distribution of the back diffusion method agreed well with that obtained by permeability measurement. It was found that the back diffusion method is very available for the through pore size distribution measurement.The shrinkage and the change in the pore size distribution by sintering were measured. The pore structure is changed by sintering not only in porosity but also remarkably in tortuosity. The tortuosity plays very important roles in permeability and slag-action of refractory as well as the pore size distribution.
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