Honeycomb structure and method of manufacturing the same
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B01D-024/00
B01D-039/14
B01D-039/00
B01D-050/00
출원번호
US-0083993
(2005-03-21)
등록번호
US-7429285
(2008-09-30)
우선권정보
JP-2004-086086(2004-03-24)
발명자
/ 주소
Kuki,Tatsuyuki
Kai,Ryuji
출원인 / 주소
NGK Insulators, Ltd.
대리인 / 주소
Oliff & Berridge, PLC
인용정보
피인용 횟수 :
7인용 특허 :
6
초록▼
A honeycomb structure 20 includes a cell structure 10 having a plurality of cells 9 communicating between two open ends being partitioned and defined by porous partition walls 7, an outer wall 30 disposed at the periphery of the cell structure 10, and first plugging portions 25 disposed in a checker
A honeycomb structure 20 includes a cell structure 10 having a plurality of cells 9 communicating between two open ends being partitioned and defined by porous partition walls 7, an outer wall 30 disposed at the periphery of the cell structure 10, and first plugging portions 25 disposed in a checkered flag pattern at one end and the other end of the cell structure 10 by plugging alternately either of the two open ends of the cells, a fluid to be flown from one of the open ends of each of the cells 9 being capable of penetrating the porous partition walls 7 and flowing out from the other open end 5 of each of the cells 9 as a filtered fluid. The honeycomb structure 20 includes the first plugging portions 25 having been fired after plugging, and second plugging portions 26 having been unfired even after plugging.
대표청구항▼
What is claimed is: 1. A honeycomb structure, comprising: a cell structure having a plurality of cells communicating between two open ends and being formed by having been partitioned by porous partition walls; an outer wall provided at a periphery of the cell structure; and first plugging portions
What is claimed is: 1. A honeycomb structure, comprising: a cell structure having a plurality of cells communicating between two open ends and being formed by having been partitioned by porous partition walls; an outer wall provided at a periphery of the cell structure; and first plugging portions provided in a checkered flag pattern at one end and the other end of the cell structure to plug either of the two open ends of the cells alternately; through which a fluid flowing from open ends thereof and penetrating the porous partition walls into the neighboring cells whose other ends are open and flowing out from the other open ends as a filtered fluid; and second plugging portions; the first plugging portions being fired after plugging but the second plugging portions being unfired even after plugging. 2. The honeycomb structure according to claim 1, wherein the second plugging portions are provided in such manner that a part of the face of at least one end out of two open ends of the cells located at an outermost peripheral portion of the structure and those located inwardly within a predetermined number counting from the outermost peripheral cell, and to which the first plugging portions are not provided is plugged thereby. 3. The honeycomb structure according to claim 2, wherein a distance from the outermost peripheral cell to a peripheral cell to which the second plugging portions are formed is 2 to 10% of a hydraulic diameter of the honeycomb structure defined by the following equation (1): description="In-line Formulae" end="lead"HD=4S/L (1)description="In-line Formulae" end="tail" wherein HD means hydraulic diameter, S means cross-sectional area of honeycomb structure perpendicular to gas passage direction, and L means circumference of cross section of honeycomb structure perpendicular to gas passage direction. 4. The honeycomb structure according to claim 1, wherein a length of the second plugging portion being formed on one end face of the cell among two ends of the structure is shorter than that of the first plugging portion. 5. The honeycomb structure according to claim 4, wherein the length of the second plugging portion is 0.5 to 3.0 mm. 6. The honeycomb structure according to claim 1, wherein a length of the second plugging portion being formed on other end face of the cell among two ends of the structure from its end face is longer than that of the first plugging portion. 7. The honeycomb structure according to claim 4, wherein a length of the second plugging portion being formed on other end face of the cell among two ends of the structure from its end face is longer than that of the first plugging portion. 8. The honeycomb structure according to claim 6, wherein the length of the second plugging portion is 5.0 mm or more. 9. The honeycomb structure according to claim 7, wherein the length of the second plugging portion is 5.0 mm or more. 10. The honeycomb structure according to claim 1, wherein at least one of the outer wall and the second plugging portion of the honeycomb structure is formed of a material containing ceramics. 11. The honeycomb structure according to claim 1, comprising a protrusion formed of a material containing ceramics and peripherally provided to the honeycomb structure on a position of at least one of end faces extending from the outer wall to the peripheral cells of the honeycomb structure. 12. The honeycomb structure according to claim 11, wherein a vertical cross-sectional shape of the protrusion is a tapered shape or a round head shape. 13. The honeycomb structure according to claim 1, wherein the second plugging portions are mainly formed in ranges of 10 to 80��, 100 to 170��, 190 to 260��, and 280 to 350�� based on an axis which passes through a center of the honeycomb structure and intersects the partition walls at right angles. 14. The honeycomb structure according to claim 3, wherein the second plugging portions are mainly formed in ranges of 10 to 80��, 100 to 170��, 190 to 260��, and 280 to 350�� based on an axis which passes through a center of the honeycomb structure and intersects the partition walls at right angles. 15. The honeycomb structure according to claim 1, wherein a cross-sectional shape of the cell is a triangle, quadrangle, hexagon, octagon, or circle, or a shape obtained by combining these shapes. 16. The honeycomb structure according to claim 1 which includes one material selected from the group consisting of cordierite, silicon carbide, silicon nitride, alumina, mullite, aluminum titanate, and LAS as a main crystal phase. 17. A method of manufacturing a honeycomb structure which comprises the steps of: providing a first plugging portion to a honeycomb formed product, in which a plurality of cells communicating between two open ends are partitioned and formed by porous partition walls, in a checkered flag pattern at one end and the other end of the honeycomb formed product so that either of the two open ends of each of the cells is plugged with a plugging material, alternately, firing the honeycomb formed product to obtain a honeycomb structure; grinding a periphery of the honeycomb structure to a predetermined outer dimension to form grooves open to the outside and extending in the axial direction by removing an outer portion of partition walls of the outermost peripheral cells which faces to outside; filling at least thus formed grooves of the honeycomb structure with a material containing ceramics to form an outer wall to have a predetermined outer dimension; and filling at least a part of the open ends of the cells located at an outermost peripheral portion of the structure and located inwardly from the outermost peripheral cell at a position within a predetermined number of cells counting therefrom, and to which the first plugging portions are not provided is plugged thereby, and drying the material used for plugging to form a second plugging portion; said second plugging portion being unfired. 18. The method of manufacturing a honeycomb structure according to claim 17, wherein the material containing at least one ceramic material selected from the group consisting of cordierite particles, ceramic fibers and an amorphous oxide matrix present between cordierite particles and/or ceramic fibers. 19. The method of manufacturing a honeycomb structure according to claim 18, wherein the amorphous oxide matrix is a matrix formed of colloidal silica or colloidal alumina. 20. The method of manufacturing a honeycomb structure according to claim 17, wherein the honeycomb structure includes one material selected from the group consisting of cordierite, silicon carbide, silicon nitride, alumina, mullite, aluminum titanate, and LAS as a main crystal phase.
Audinwood, Colby William; Cecce, Anthony Joseph; Culbertson, Toka M; Warren, Courtney Spencer, Compositions and methods for plugging honeycomb bodies with reduced plug depth variability.
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