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US 12,544,702 B2Granted
Pillar-shaped honeycomb structure and method for manufacturing same
AssigneeNGK Insulators, Ltd.
InventorKoichi Sendo
Life of this patent
Estimating the term…
Abstract
A pillar-shaped honeycomb structure filter including a plurality of first cells and a plurality of second cells, the first cells and the second cells being alternately arranged adjacent to each other with a porous partition wall interposed therebetween, wherein a ceramic porous film, in which an average film thickness T (unit: μm) is 2 to 50 μm, a porosity P (unit: %) is 65 to 90%, and the average film thickness T and the porosity P satisfy a relational expression of 0.36 T+60≤P≤0.75 T+72, is formed on a surface of each of the first cells.
Claims7
A pillar-shaped honeycomb structure filter, comprising:
- a plurality of first cells extending from an inlet side end surface to an outlet side end surface, opening on the inlet side end surface and having a sealing portion on the outlet side end surface;
- and
- a plurality of second cells extending from the inlet side end surface to the outlet side end surface, having a sealing portion on the inlet side end surface and opening on the outlet side end surface, the first cells and the second cells being alternately arranged adjacent to each other with a porous partition wall interposed therebetween;
- wherein a ceramic porous film, in which an average film thickness T is 2 to 50 m, a porosity P is 65 to 90%, and the average film thickness T and the porosity P satisfy a relational expression of 0.42 T+67≤P≤0.75 T+72, is formed on a surface of each of the first cells,
- wherein the porous film is formed on the surface of the first cells after the pillar-shaped honeycomb structure has undergone a firing step,
- wherein a thickness of the porous partition wall is 0.26 mm or less;
- and
- wherein the porous partition wall comprises 50% by mass or more of cordierite.
5 more elements
Dependencies are inferred from the claim text.