Patent ID: 7833606
Filing Date: 2010-11-16
Classification: B01D,C04B,F01N,Y02T,Y10T

Abstract:
1. A ceramic honeycomb structure having porous cell walls defining large numbers of flow paths, said cell walls having porosity of 55-70%, an average pore diameter of 10-40 μm, a concave area ratio CR (projected area ratio of portions lower than an average surface determined from cell wall surface roughness by a least square method) of 0.32-0.6, and an average concave depth H concave (average depth of portions lower than the average surface) of 0.02-0.1 mm, wherein said honeycomb structure is produced from cordierite-forming material powder containing 5-20% by mass of silica powder having a BET specific surface area of 1-3 m 2 /g and an aspect ratio of 1.2-5, and a pore-forming material consisting essentially of a foamed resin having an average particle size of 40-80 μm and added in an amount of 6-15 parts by mass to 100 parts by mass of said cordierite-forming material powder.