Fig. 3 shows the pore size distributions of the prepared filters at various sintering temperatures.The pore size distribution in the filter sintered at 1450 C was more uniform and narrower than those of other ceramic filters. To investigate filter uniformity,we divided each prepared filter into four zones and measured the partial pressure drop of the prepared
ceramic filters followed by our previous study [3]. Fig. 4 shows the partial pressure drop difference at each zone of the
prepared filters.As shown in the figure, the ceramic filter sintered at 1450 C showed the most constant partial pressure drop at the same filtration velocity regardless of divided zones.