Abstract
Distributions of pore sizes greater than 100Å in tungsten and tungsten carbide powders have been determined by a Hg-porosimeter, (with the Hg-pressure up to about 1000 kg/cm2).
Pore sizes were corrected, assuming that the total surface area of pores calculated from the pore distribution curves is consistent with that by BET method.
Following results are obtained ;
(1) Relations between mean particle size obtained by permeability method (Fisher Sub-Sieve Sizer) and mean pore size determined by a Hg-porosimeter have been recognized.
(2) Ratio of mean particle size to mean pore size was about 1.0 for tungsten and about 0.5 for tungsten carbide powders. The discrepancy would be probably due to differences in pore shape between the powders.
(3) Pore distribution curves of each sample are characteristic of its shape. In almost all samples, one peak of maxima was present, but in exceptional case, in one of the tungsten powders, two peaks were observed.
