Honeycomb filter and method for producing honeycomb filter

摘要

There is provided a honeycomb filter wherein particles having an average particle diameter smaller than the average pore diameter of partition walls are deposited at least in open pores formed in the surface layer of the partition wall and in the pores of the partition wall in a surface layer portion of the partition walls on the exhaust gas inflow side, thereby forming a composite region. The average pore diameter of the partition walls is 5 to 40 mum, and the porosity of the partition wall is 35 to 75%. The particles to be deposited have an average particle diameter of 1 to 15 mum, and the height of the composite region is not more than 80 mum in the direction from the outermost contour line of the partition walls to the surface of the partition walls.