Patent ID: 8470430

Claim:
A honeycomb structure having a honeycomb shape which is a columnar article having two end faces and an outer peripheral surface connecting the two end faces to each other and which includes a plurality of cells as through channels for a fluid formed in parallel between the two end faces and partitioned by partition walls of a porous material, wherein at least in a central axis side of the columnar article, as compared with partition walls of an end face side portion of an inlet of the fluid, partition walls of an end face side portion of an outlet of the fluid satisfy at least one of the following conditions (1) to (4): (1) a heat conductivity being relatively high; (2) a heat capacity being relatively large; (3) a bending strength being relatively high; and (4) a porosity being relatively low; and wherein the end face side portion of the outlet of the fluid is a portion of 1/n of the whole structure from the end face of the outlet of the fluid in the central axis direction of the columnar article, the value n is 2 or more and 10 or less, and wherein only the end face side portion of the outlet or a portion of the article comprising the end face side portion of the outlet is coated with a modification slurry, the modification slurry including SiC particles having an average particle diameter that is 2% or more and 60% or less of the average pore diameter of the porous material of the partition walls.