CERAMIC HONEYCOMB FILTER AND METHOD FOR MANUFACTURING SAME

摘要

A ceramic honeycomb filter for removing fine particles in exhaust gas, characterized in that: a plurality of ceramic honeycomb structures each having many cells separated by porous partition walls are connected in an axial direction, with the end faces thereof being joined to each other; at least part of the partition walls of at least one set of adjoining ceramic honeycomb structures are joined to each other in a mutually shifted state; when the opening area of one cell in the cross-section perpendicular to the axial direction of the upstream one of the adjoining ceramic honeycomb structures is expressed as A01, and the opening area of the one cell after being reduced as a result of being narrowed by the upstream end face of the partition walls of the downstream ceramic honeycomb structure is expressed as A02,the average of the opening area ratios A0 (=A02/A01) of the respective cells in any contiguous 5 cells×5 columns (=25 cells) is equal to or less than 0.9; and the roughness (the maximum height is Rz) of each of the partition wall end face and the partition wall surface of the downstream ceramic honeycomb structure is equal to or larger than 15µm.