Honeycomb unit and honeycomb structure
A honeycomb unit includes a plurality of walls and a plurality of cells. The plurality of cells are defined by the plurality of walls and extend along a longitudinal direction of the honeycomb unit. Each of the plurality of cells has opposite first and second end portions along the longitudinal direction. Either one of the first and second end portions is sealed. X and Y satisfy a following relationship, 100/3·X+5≦Y≦100/3·X+40, wherein Y is a ratio of a weight of an unsealed region in said cells to a weight of a sealed region in said cells and X is a ratio of a length in the longitudinal direction of said honeycomb unit to an area of a cross-section perpendicular to the longitudinal direction of said honeycomb unit. X is at least about 0.1 and at most about 0.26.
1. A honeycomb unit comprising:
a plurality of walls; and
a plurality of cells which are defined by the plurality of walls and which extend along a longitudinal direction of the honeycomb unit, each of said plurality of cells having opposite first and second end portions along the longitudinal direction, either one of the first and second end portions being sealed, X and Y satisfying a following relationship
100/3 ·X+ 5 ≦Y≦ 100/3 ·X+ 40
wherein Y is a ratio of a weight of an unsealed region in said cells to a weight of a sealed region in said cells, and wherein X is a ratio of a length in the longitudinal direction of said honeycomb unit to an area of a cross-section perpendicular to the longitudinal direction of said honeycomb unit, and X is at least about 0.1 and at most about 0.26.
2. The honeycomb unit according to claim 1 ,
wherein
an apparent density of the unsealed region in said cells of said honeycomb unit is at least about 0.4 g/cm 3 and at most about 0.7 g/cm 3 .
3. The honeycomb unit according to claim 1 ,
wherein
an apparent density of the sealed region in said cells of said honeycomb unit is at least about 0.4 g/cm 3 and at most about 2.0 g/cm 3 .
4. The honeycomb unit according to claim 1 ,
wherein
said honeycomb unit comprises silicon carbide based ceramics.
5. The honeycomb unit according to claim 1 ,
wherein
said honeycomb unit and the plug of the sealed region comprise the same porous ceramic.
6. The honeycomb unit according to claim 1 ,
wherein
said honeycomb unit and the plug of the sealed region comprise silicon carbide based ceramics.
7. The honeycomb unit according to claim 1 ,
wherein
a catalyst is supported on said honeycomb unit.
8. A honeycomb structure comprising:
a plurality of honeycomb units; and
at least one adhesive layer bonding the plurality of honeycomb units, each of the plurality of honeycomb units comprising:
a plurality of walls; and
a plurality of cells which are defined by the plurality of walls and which extend along a longitudinal direction of the honeycomb unit, each of said plurality of cells having opposite first and second end portions along the longitudinal direction, either one of the first and second end portions being sealed, X and Y satisfying a following relationship
100/3 ·X+ 5 ≦Y≦ 100/3 ·X+ 40
wherein Y is a ratio of a weight of an unsealed region in said cells to a weight of a sealed region in said cells, and
wherein X is a ratio of a length in the longitudinal direction of said honeycomb unit to an area of a cross-section perpendicular to the longitudinal direction of said honeycomb unit, and X is at least about 0.1 and at most about 0.26.
9. The honeycomb structure according to claim 8 ,
wherein
in at least one of said honeycomb units, an apparent density of the unsealed region in said cells is at least about 0.4 g/cm 3 and at most about 0.7 g/cm 3 .
10. The honeycomb structure according to claim 8 ,
wherein
in at least one of said honeycomb units, an apparent density of the sealed region in said cells is at least about 0.4 g/cm 3 and at most about 2.0 g/cm 3 .
11. The honeycomb structure according to claim 8 ,
wherein
at least one of said honeycomb units comprises silicon carbide based ceramics.
12. The honeycomb structure according to claim 8 ,
wherein
in at least one of said honeycomb units, said honeycomb unit and the plug of the sealed region comprise the same porous ceramic.
13. The honeycomb structure according to claim 8 ,
wherein
in at least one of said honeycomb units, said honeycomb unit and the plug of the sealed region comprise silicon carbide based ceramics.
14. The honeycomb structure according to claim 8 ,
wherein
a catalyst is supported on said honeycomb structure.
15. The honeycomb structure according to claim 8 ,
wherein
said honeycomb structure is applied to an exhaust gas purifying device for a vehicle.
16. A honeycomb structure comprising:
one honeycomb unit comprising:
a plurality of walls; and
a plurality of cells which are defined by the plurality of walls and which extend along a longitudinal direction of the honeycomb unit, each of said plurality of cells having opposite first and second end portions along the longitudinal direction, either one of the first and second end portions being sealed, X and Y satisfying a following relationship
100/3 ·X+ 5 ≦Y≦ 100/3 ·X+ 40
wherein Y is a ratio of a weight of an unsealed region in said cells to a weight of a sealed region in said cells, and
wherein X is a ratio of a length in the longitudinal direction of said honeycomb unit to an area of a cross-section perpendicular to the longitudinal direction of said honeycomb unit, and X is at least about 0.1 and at most about 0.26.
17. The honeycomb structure according to claim 16 ,
wherein
an apparent density of the unsealed region in said cells of said honeycomb unit is at least about 0.4 g/cm 3 and at most about 0.7 g/cm 3 .
18. The honeycomb structure according to claim 16 ,
wherein
an apparent density of the sealed region in said cells of said honeycomb unit is at least about 0.4 g/cm 3 and at most about 2.0 g/cm 3 .
19. The honeycomb structure according to claim 16 ,
wherein
said honeycomb unit comprises cordierite or aluminum titanate.
20. The honeycomb structure according to claim 16 ,
wherein
said honeycomb unit and the plug of the sealed region comprise the same porous ceramic.
21. The honeycomb structure according to claim 16 ,
wherein
said honeycomb unit and the plug of the sealed region comprise cordierite or aluminum titanate.
22. The honeycomb structure according to claim 16 ,
wherein
a catalyst is supported on said honeycomb structure.
23. The honeycomb structure according to claim 16 ,
wherein
said honeycomb structure is applied to an exhaust gas purifying device for a vehicle.