Honeycomb filter
AssigneeNGK Insulators, Ltd.
InventorsShuichi Ichikawa, Naoshi Masukawa
Life of this patent
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Abstract
A honeycomb filter 1, which comprises an integral structure of a plurality of honeycomb segments 12 bonded by an adhesive 8. The honeycomb segment has numbers of through-holes 3, which are surrounded by partition walls 2 and extend in the axial direction of the segment. The honeycomb filter is characterized in that a ratio of a thermal conductivity κ s of the honeycomb segment 12 to a thermal conductivity κ a of the adhesive 8, κ s/κ a, is in a range of 5 to 300 and a density ρ a of the adhesive 8 is in a range of 0.1 to 4 g/cc. The honeycomb filter can prevent excessive temperature increase, can be low in non-uniformity of temperature distribution, and can be superior in durability.
Claims23
A honeycomb filter which comprises an integral structure of a plurality of honeycomb segments bonded by an adhesive, the honeycomb segment having numbers of through-holes which are surrounded by partition walls and extend in an axial direction of the segment,
- wherein a ratio of a thermal conductivity κ s of the honeycomb segment to a thermal conductivity κ a of the adhesive, κ s/κ a, is in a range of 5 to 300, a density ρ a of the adhesive is in a range of 0.1 to 4 g/cc and a heat capacity Ha per unit volume of the adhesive, represented by specific heat Cpa×density ρ a is in a range of 0.1×106 to 3×106 J/m3·K.
A honeycomb filter which comprises an integral structure of a plurality of honeycomb segments bonded by an adhesive, the honeycomb segment having numbers of through-holes which are surrounded by partition walls and extend in an axial direction of the segment,
- wherein a ratio of a thermal conductivity κ s of the honeycomb segment to a thermal conductivity κ a of the adhesive, κ s/κ a, is in a range of 5 to 300 and a density ρ a of the adhesive is in a range of 0.1 to 4 g/cc, and
- wherein the honeycomb filter comprises two or more adhesives different in either or both of thermal conductivity κ a and heat capacity Ha per unit volume.
A honeycomb filter which comprises an integral structure of a plurality of honeycomb segments bonded by an adhesive, the honeycomb segment having numbers of through-holes which are surrounded by partition walls and extend in an axial direction of the segment,
- wherein a ratio of a thermal conductivity κ s of the honeycomb segment to a thermal conductivity κ a of the adhesive, κ s/κ a, is in a range of 5 to 300, a density ρ a of the adhesive is in a range of 0.1 to 4 g/cc and a thermal expansion coefficient of the adhesive is in a range of 1×10−6 to 8×10−6° C.
Dependencies are inferred from the claim text.