Abstract
A method is proposed for estimating the influence of the size and shape of electrocorundum powder particles on the average capillary radius of the porous structure of electrocorundum ceramic on the basis of the geometric form factor and specific surface area of the particles. The procedure is based on a three-dimensional model of the porous structure of materials where the geometry of the capillaries is taken into account. The expression obtained for the average capillary radius is significantly more accurate than Kozeny’s relation and methods based on a model with non-intersecting capillaries, which understate the radius. It is noted that the effect of the thickness of porous ceramic samples on the gas permeability is very small.
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