Patent ID: 8470255
Filing Date: 2013-06-25
Classification: B01J,C04B,F01N

Abstract:
1. A honeycomb filter comprising a base material having a honeycomb-structured substrate provided with a plurality of cells separated by partition walls of porous ceramic having pores and functioning as exhaust gas passages, wherein plugging portions are formed alternately in one side open end portions and the other side open end portions of the plural cells, at least in pores formed in a surface layer of the partition walls and in pores in the partition walls, a composite region is formed by depositing particles having an average particle diameter smaller than an average pore diameter of the partition walls in a surface layer portion of the partition walls on the exhaust gas inflow side, the partition walls have an average pore diameter of 5 to 40 μm and a porosity of 35 to 75%, the particles deposited have an average particle diameter of 1 to 15 μm, and the composite region has a height of 80 μm or less with respect to the partition wall surface direction from the outermost contour line of the partition walls.