A ceramic honeycomb structure suitable for particulate filters, having an inlet face and an outlet face, comprising a plurality of inlet cells and a plurality of outlet cells extending through the structure from the inlet face to the outlet face, the inlet cells being open at the inlet face and clos
A ceramic honeycomb structure suitable for particulate filters, having an inlet face and an outlet face, comprising a plurality of inlet cells and a plurality of outlet cells extending through the structure from the inlet face to the outlet face, the inlet cells being open at the inlet face and closed where adjoining the outlet face, and the outlet cells being open at the outlet face and closed where adjoining the inlet face. The inlet and/or outlet cells are quadrangular in cross-section and are arranged in an alternating pattern; the outlet cells may have a cross-sectional area generally smaller than that of inlet cells and no point of a given inlet cell is closer to an adjacent inlet cell than to an adjacent outlet cell. A process for preparing the ceramic honeycomb structure is also disclosed.
대표청구항▼
1. A ceramic honeycomb structure having an inlet face and an outlet face, comprising a plurality of inlet cells and a plurality of outlet cells extending through the structure from the inlet face to the outlet face, the inlet cells being open at the inlet face and closed where adjoining the outlet f
1. A ceramic honeycomb structure having an inlet face and an outlet face, comprising a plurality of inlet cells and a plurality of outlet cells extending through the structure from the inlet face to the outlet face, the inlet cells being open at the inlet face and closed where adjoining the outlet face, and the outlet cells being open at the outlet face and closed where adjoining the inlet face, wherein: the inlet and outlet cells are arranged in a checkerboard arrangement,the inlet cells are quadrangular in cross-section; andadjacent inlet cells along a given diagonal within the checkerboard arrangement are rotated relative to one another. 2. The ceramic honeycomb structure of claim 1, wherein adjacent inlet cells along a given diagonal of the checkerboard arrangement are rotated relative to one another by an angle higher than 1 degree. 3. The ceramic honeycomb structure according to claim 1, wherein no point of a given inlet cell is closer to an adjacent inlet cell than to an adjacent outlet cell. 4. The ceramic honeycomb structure according to claim 1, wherein the surface of filtration per volume of filter ranges from 0.8 to 1 mm2/mm3. 5. The ceramic honeycomb structure according to claim 1, wherein the aperture ratio is higher than 35%. 6. The ceramic honeycomb structure according to claim 1, wherein the outlet cells have an acute interior angle (α) ranging from 50 to 85 degrees. 7. The ceramic honeycomb structure according to claim 1, wherein the inlet cells have an acute interior angle (β) and the outlet cells have an acute interior angle (α), and (β) is higher than (α). 8. The ceramic honeycomb structure according to claim 1, wherein quadrangular cells have one or more chamfered or rounded corners. 9. The ceramic honeycomb structure according to claim 1, wherein adjacent cells are separated by partition walls having a thickness ranging from 100 to 500 microns. 10. The ceramic honeycomb structure according to claim 1, comprising one or more minerals selected from the group consisting of silicon carbide (SiC), silicon nitride, mullite, cordierite, zirconia, titania, silica, magnesia, alumina, spinel, tialite, kyanite, sillimanite, andalusite, lithium aluminum silicate, and aluminum titanate. 11. The ceramic honeycomb structure according to claim 1, having a coefficient of thermal expansion ranging from 0 to 9·10−6K−1. 12. The ceramic honeycomb structure according to claim 1, wherein the cells have a surface roughness Ra ranging from 1 to 100 microns. 13. The ceramic honeycomb structure according to claim 1, having a total porosity ranging from 20 to 80%. 14. The ceramic honeycomb structure according to claim 1, having pore diameter d50 ranging from 1 to 60 microns. 15. A process for preparing a ceramic honeycomb structure according to claim 1, the method comprising: providing a green honeycomb structure having a pattern of inlet cells and outlet cells according to claim 1;optionally drying the green honeycomb structure; andsintering the green honeycomb structure. 16. The method according to claim 15, wherein providing a green honeycomb structure comprises providing an extrudable ceramic mixture and extruding the mixture to form the green honeycomb structure. 17. A particulate filter comprising one or more ceramic honeycomb structures according to claim 1.
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이 특허에 인용된 특허 (14)
Outland Robert J. (Grosse Pointe Woods MI), Ceramic filters for diesel exhaust particulates.
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