CERAMIC POROUS BODY AND METHOD FOR EVALUATING ITS PERMEABILITY

摘要

A ceramic porous body where a multiplicity of pores are formed in a ceramic basic material at a specified porosity. A pore part (1) is discriminated from a non-pore part (2) by binarizing the cross-sectional plane image of the basic material by image analysis. When a line (3) passing the central part of the pore part (1) is drawn, the porosity (ɛ(%)), the means width (DP (mum)) of the pore parts represented by the mean value of the distance, between the outlines specifying the pore part (1), perpendicular to the center line (3), the length of the center line (3) between adjacent branch points (4), the mean length (L (mum)) of pore parts represented by the mean value of the length of the center line (3) between the end (5) of the center line (3) and the branch point (4), and the mean pore size (DH (mum)) satisfy a specified relation. Used as a material composing a filter, e.g. a DPF, it retains a sufficient strength while having a high porosity and exhibits high capturing efficiency and high permeability.