The ceramic honeycomb structure according to the present invention includes a cell group having a plurality of cells which are divided each other by porous partition walls and functioning as a fluid channel, and porous outer wall surrounding and holding outermost peripheral cells located at a circum
The ceramic honeycomb structure according to the present invention includes a cell group having a plurality of cells which are divided each other by porous partition walls and functioning as a fluid channel, and porous outer wall surrounding and holding outermost peripheral cells located at a circumference of the cell group. In the partition walls, a part located at least one opening end of the cells of the cell group constitutes a reinforced partition wall part having higher strength than the other part of the partition walls (normal partition wall part) as well as having a variation of porosity per unit volume within ��2%. Uniform and excellent erosion resistance is achieved throughout the reinforced partition wall part.
대표청구항▼
The invention claimed is: 1. A ceramic honeycomb structure comprising: a cell group having cells, the cells being divided each other by porous partition walls and functioning as a fluid channel; and a porous outer wall surrounding and holding outermost peripheral cells located at a circumference of
The invention claimed is: 1. A ceramic honeycomb structure comprising: a cell group having cells, the cells being divided each other by porous partition walls and functioning as a fluid channel; and a porous outer wall surrounding and holding outermost peripheral cells located at a circumference of the cell group, wherein in the partition walls, a part located at at least one opening end of the cells of the cell group constitutes a reinforced partition wall part having higher strength than the other part of the partition walls as well as having a variation of porosity per unit volume within ��2%. 2. The ceramic honeycomb structure according to claim 1, wherein the value of porosity (%) of the reinforced partition wall part is smaller than the value of porosity (%) of the normal partition wall part by 3(%) or more. 3. The ceramic honeycomb structure according to claim 1, wherein porosity of the reinforced partition wall is 30% or less. 4. The ceramic honeycomb structure according to claim 1, wherein the minimum partition wall thickness of the partition walls is in the range of 0.030 to 0.076 mm. 5. The ceramic honeycomb structure according to claim 1, wherein the length from the end face of the opening end of the cells to a tip end of each reinforced partition wall part is not uniform throughout the reinforced partition wall part. 6. The ceramic honeycomb structure according to claim 1, wherein the partition wall thickness of the reinforced partition wall part is larger than the partition wall thickness of the normal partition wall part. 7. The ceramic honeycomb structure according to claim 1, wherein taking the outermost peripheral cell as a starting cell, taking any cell of the third to the twentieth cell located inwardly from the starting cell as an end cell and taking cells located inwardly from the end cell as basic cells, a relation between thickness (Tc) of partition walls forming the basic cells and a thickness of the starting cell (Tr1) of partition walls forming the starting cell and the end cell is 1.10≦Tr1/Tc≦3.00, and the relation between thickness (Tc) of partition walls forming the basic cells and the thickness of any cell of the third to the twentieth cell (Tr3-20) located inwardly from the starting cell, of partition walls forming the starting cell and the end cell is 1.10≦(Tr3-20)/Tc≦3.00. 8. The ceramic honeycomb structure according to claim 1, comprising at least one kind of ceramic selected from the group consisting of cordierite, alumina, mullite, silicon nitride, aluminum titanate, zirconia and silicon carbide. 9. The ceramic honeycomb structure according to claim 1, wherein a sectional shape of the honeycomb structure perpendicular to the channel is circular, elliptic, oval, trapezoidal, triangular, tetragonal, hexagonal or asymmetric. 10. The ceramic honeycomb structure according to claim 1, wherein the sectional shape of the honeycomb structure perpendicular to the channel is triangular, tetragonal or hexagonal. 11. The ceramic honeycomb structure according to claim 1, used as a carrier of catalyst for automobile exhaust gas emission control. 12. The ceramic honeycomb structure according to claim 1, incorporated into a catalyst converter in such a manner that the partition walls bear a catalyst component and the ceramic honeycomb structure is held at the outer circumference of the outer wall.
Cunningham George M. (Horseheads NY) Frost Rodney I. (Corning NY) Lachman Irwin M. (Corning NY), Extrusion die for protrusion and/or high cell density ceramic honeycomb structures.
Ueda Takeshi,JPX ; Ito Keiji,JPX ; Murata Masakazu,JPX ; Andou Yoshiyasu,JPX ; Tanaka Masakazu,JPX ; Obata Takashi,JPX, Honeycomb structural body and process for production of the same.
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