Ceramic honeycomb filter and its production method

摘要

A ceramic honeycomb filter comprising a ceramic honeycomb structure having large numbers of flow paths partitioned by porous cell walls, and plugs disposed in the flow paths alternately on the exhaust gas inlet or outlet side, to remove particulate matter from an exhaust gas passing through the porous cell walls; the porous cell walls having porosity of 45-75%, the median pore diameter A (μm) of the cell walls measured by mercury porosimetry, and the median pore diameter B (μm) of the cell walls measured by a bubble point method meeting the formula of 35<(A−B)/B×100≦70, and the maximum pore diameter of the cell walls measured by a bubble point method being 100 μm or less.

主权项

1. A ceramic honeycomb filter comprising a ceramic honeycomb structure having large numbers of flow paths partitioned by porous cell walls, and plugs disposed alternately in said flow paths on the exhaust gas inlet or outlet side, to remove particulate matter from an exhaust gas passing through said porous cell walls;
said porous cell walls having porosity of 45-75%, the median pore diameter A (μm) of said cell walls measured by mercury porosimetry, and the median pore diameter B (μm) of said cell walls measured by a bubble point method meeting the formula of 35<(A−B)/B×100≦70, and the maximum pore diameter of said cell walls measured by a bubble point method being 100 μm or less.