Ceramic honeycomb filter and its production method
AssigneeHitachi Metals, Ltd.
InventorsMasakazu Konomi, Hirohisa Suwabe
Life of this patent
Estimating the term…
Abstract
A ceramic honeycomb filter comprising a honeycomb structure having large numbers of flow paths partitioned by porous cell walls, and plugs alternately formed in the flow paths on the exhaust-gas-inlet and outlet sides, the outlet-side plugs having porosity of 65% or less, and the upstream-side end surfaces of the outlet-side plugs having surface roughness Ra of 13-50 μm.
Claims5
A ceramic honeycomb filter comprising a honeycomb structure having large numbers of flow paths partitioned by porous cell walls, and plugs alternately formed in said flow paths on the exhaust-gas-inlet and outlet sides, said outlet-side plugs having porosity of 65% or less, and the upstream-side end surfaces of said outlet-side plugs having surface roughness Ra of 13-50 μm.
A method for producing a ceramic honeycomb filter comprising a honeycomb structure having large numbers of flow paths partitioned by porous cell walls, and plugs alternately formed in said flow paths on the exhaust-gas-inlet and outlet sides, said outlet-side plugs having porosity of 65% or less, and the upstream-side end surfaces of said outlet-side plugs having surface roughness Ra of 13 μm or more, comprising the steps of forming the outlet-side plugs with slurry containing ceramic powder having an average particle size of 5 μm or less, accumulating ceramic powder having an average particle size of 10-200 μm on the upstream-side end surfaces of the plugs, and integrally sintering them.
Dependencies are inferred from the claim text.