Mean pore size of sheet materials from nonspherical powders

1.	It is shown that the ratio of the mean pore size of a sintered sheet material produced from a non-spherical powder to the mean powder particle size diminishes with increase in starting particle size. Kozeny's formula cannot be used for calculating the mean pore sizes of sheet materials other than those of 20–30% porosity made from a 20–40 powder fraction.
2.	It has been established that in the power-type relationship between the mean pore size of a sheet material and its porosity the exponent grows with increase in powder particle size. Deviations from the power-type relationship exhibited by sheets of more than 40% porosity produced from coarse powder fractions are linked with changes in the pore tortuosity factor.