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Ceramic honeycomb structure and its production method

  • US 9,981,255 B2
  • Filed: 03/31/2014
  • Issued: 05/29/2018
  • Est. Priority Date: 04/02/2013
  • Status: Active Grant
First Claim
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1. A ceramic honeycomb structure comprising a plurality of cells partitioned by porous cell walls, said cell walls having(a) porosity of 50-80%;

  • andwhen measured by mercury porosimetry,(b) a median pore diameter being 25-50 μ

    m;

    (c) (i) a cumulative pore volume in a pore diameter range of 20 μ

    m or less being 25% or less of the total pore volume;

    (ii) a cumulative pore volume in a pore diameter range of more than 20 μ

    m and 50 μ

    m or less being 50% or more of the total pore volume; and

    (iii) a cumulative pore volume in a pore diameter range of more than 50 μ

    m being 12% or more of the total pore volume;

    wherein an opening area ratio of pores open on said cell wall surfaces (a total opening area of pores per a unit cell wall surface area) is 30% or more; and

    wherein said ceramic honeycomb structure has an A-axis compression strength of 1.0 MPa or more.

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