| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a ceramic honeycomb structure suitable for a ceramic honeycomb filter which is high in initial particulate capturing efficiency, e.g., in an early stage of operation of a diesel engine or immediately after regeneration of a filter, can prevent harmful fine particles from being discharged in the early stage and can realize low pressure loss. <P>SOLUTION: The ceramic honeycomb structure has a number of passages partitioned by porous partition walls. The porosity of the partition wall is 55 to 75%, the average pore diameter Da on the surface of the partition wall is 5 to 30 μm, and the pore area ratio Sa on the surface of the partition wall is 10 to 30%. Further, the average value La of the opening part lengths at the surface of a plurality of pores open to the surface of the partition wall observed in a cut surface perpendicular to the surface of the partition wall and the average value Lb of the widths of the plurality of pores at a depth of La from the surface of the partition wall on the cut surface have a relationship represented by 1.1<Lb/La<5. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
