A ceramic filter assembly having improved exhaust gas processing efficiency. The ceramic filter assembly (9) is produced by adhering with a ceramic seal layer (15) outer surfaces of a plurality of filters (F1), each of which is formed from a sintered porous ceramic body. The seal layer (15) has a th
A ceramic filter assembly having improved exhaust gas processing efficiency. The ceramic filter assembly (9) is produced by adhering with a ceramic seal layer (15) outer surfaces of a plurality of filters (F1), each of which is formed from a sintered porous ceramic body. The seal layer (15) has a thickness of 0.3 mm to 3 mm and a thermal conductance of 0.1 W/mK to 10 W/mk.
대표청구항▼
What is claimed is: 1. An integral ceramic filter assembly produced by adhering with a ceramic seal layer outer surfaces of a plurality of filters, each of which is formed from a sintered α-type silicon carbide, wherein the seal layer has a thickness of 0.3 to 3 mm and a thermal conductance of
What is claimed is: 1. An integral ceramic filter assembly produced by adhering with a ceramic seal layer outer surfaces of a plurality of filters, each of which is formed from a sintered α-type silicon carbide, wherein the seal layer has a thickness of 0.3 to 3 mm and a thermal conductance of 0.1 to 10 W/mk. 2. The ceramic filter assembly according to claim 1, wherein the filter has an average porosity of 30 to 70%. 3. The ceramic filter assembly according to claim 1, wherein the filter has a thermal conductance of 20 to 80 W/mk. 4. The ceramic filter assembly according to claim 1, wherein the filter has a thermal conductance of 20 to 80 W/mk and an average porosity of 30 to 70%. 5. The ceramic filter assembly according to claim 1, wherein the seal layer includes 3 to 80 wt % of inorganic grains. 6. The ceramic filter assembly according to claim 1, wherein the assembly is a diesel particulate filter. 7. The ceramic filter assembly according to claim 1, wherein the filter has a plurality of cells, and each cell has an outer surface which carries at least one oxide catalyst selected from a platinum group element, other metal elements and oxides of these metal elements. 8. The ceramic filter assembly according to claim 1, wherein the assembly has an outer form in a round cross-section or oval cross-section. 9. An exhaust gas purification apparatus having the ceramic filter assembly according to claim 1 arranged in a casing that is located in an exhaust gas passage of an internal combustion engine. 10. An integral ceramic filter assembly produced by adhering with a ceramic seal layer outer surfaces of a plurality of elongated honeycomb filters, each of which is formed from a sintered α-type silicon carbide, wherein a ratio L/S between a filter length L in a flow direction of a processed fluid and a filter cross-section S in a direction perpendicular to the flow direction is 0.06 to 0.75 mm/mm 2. 11. The ceramic filter assembly according to claim 10, wherein the filter length is 167 to 300 mm. 12. The ceramic filter assembly according to claim 10, wherein the assembly is a diesel particulate filter. 13. The ceramic filter assembly according to claim 10, wherein the filter is formed from a sintered porous silicon carbide body. 14. The ceramic filter assembly according to claim 10, wherein the filters are offset from one another in a direction perpendicular to a filter axial direction. 15. The ceramic filter assembly according to claim 10, wherein the filter has a plurality of cells, and each cell has an outer surface which carries at least one oxide catalyst selected from a platinum group element, other metal elements and oxides of these metal elements. 16. An exhaust gas purification apparatus having the ceramic filter assembly according to claim 10 arranged in a casing that is located in an exhaust gas passage of an internal combustion engine. 17. An elongated honeycomb filter formed from a sintered α-type silicon carbide, the honeycomb filter having a ratio L/S between a filter length L in a flow direction of a processed fluid and a filter cross-section S in a direction perpendicular to the flow direction is 0.06 to 0.75 mm/mm2. 18. The ceramic filter assembly according to claim 17, wherein the filter has a plurality of cells, and each cell has an outer surface which carries at least one oxide catalyst selected from a platinum group element, other metal elements and oxides of these metal elements. 19. The ceramic filter assembly according to claim 17, wherein the form of the filter is a triangular pole-like shape or a hexagonal pole-like shape. 20. The ceramic filter assembly according to claim 17, wherein the filter length is 167 to 300 mm. 21. An exhaust gas purification apparatus having the ceramic filter assembly according to claim 17 arranged in a casing that is located in an exhaust gas passage of an internal combustion engine. 22. A honeycomb filter formed from a sintered α-type silicon carbide, wherein the average pore diameter of the honeycomb filter is 5 to 15 μm, the average porosity is 30 to 50%, and the honeycomb filter has 20% or more of through pores. 23. The honeycomb filter according to claim 22 comprising a plurality of cells including a first cell having a first end surface sealed by a sealing body and a second cell adjacent to the first cell, the second cell having a second end surface that is opposite to the first surface, the second end surface being sealed by a sealing body, wherein the cell number per square inch is 120 or more, and the thickness of a cell wall defining the cells is 0.46 mm or less. 24. The honeycomb filter according to claim 22, wherein the sintered α-type silicon carbide has impurities of less than 5 wt %. 25. The honeycomb filter according to claim 22, wherein the filter has a plurality of cells, and each cell has an outer surface which carries at least one oxide catalyst selected from a platinum group element, other metal elements and oxides of these metal elements. 26. The honeycomb filter according to claim 24, wherein the impurities of the silicon carbide is Al, Fe, O or free C. 27. The honeycomb filter according to claim 22, wherein the total volume of the filter is 쩌 to 2 times the total displacement of an internal combustion engine. 28. An exhaust gas purification apparatus having the honeycomb filter according to claim 22 arranged in a casing that is located in an exhaust gas passage of an internal combustion engine. 29. A honeycomb filter formed from a sintered α-type silicon carbide having a plurality of cells where each cell is defined by a cell wall, wherein the specific surface area of grains forming the cell wall is 0.1 m2/g or more. 30. The honeycomb filter according to claim 29, wherein said filter is used for exhaust gas purification. 31. The honeycomb filter according to claim 29, wherein the cell wall is formed from a porous body. 32. The honeycomb filter according to claim 29, wherein the filter has a plurality of cells, and each cell has an outer surface which carries at least one oxide catalyst selected from a platinum group element, other metal elements and oxides of these metal elements. 33. The honeycomb filter according to claim 29, wherein the average pore diameter of the honeycomb filter is 1 to 50 μm. 34. The honeycomb filter according to claim 29, wherein the average porosity of the honeycomb filter is 30 to 70%. 35. The honeycomb filter according to claim 29, wherein the cell density is 120/inch2 or greater. 36. The honeycomb filter according to claim 29, wherein the thickness of the cell wall is 0.46 mm or less. 37. The honeycomb filter according to claim 29, wherein the honeycomb filter has 20% or more of through pores. 38. The honeycomb filter according to claim 29, wherein a specific surface area of the grains forming the cell wall of the honeycomb filter is 0.1 to 1.0 m2/g. 39. The honeycomb filter according to claim 29, wherein a specific surface area of the grains forming the cell wall of the honeycomb filter is 0.3 to 0.8 m2/g. 40. An exhaust gas purification apparatus having the honeycomb filter according to claim 29 arranged in a casing that is located in an exhaust gas passage of an internal combustion engine. 41. An integral ceramic filter assembly produced by adhering with a ceramic seal layer outer surfaces of a plurality of filters, each of which is formed from a sintered porous ceramic body, wherein the filters are offset from each other in a direction perpendicular to a filter axial direction, and the seal layer has a thickness of 0.3 mm to 3 mm and a thermal conductance of 0.1 W/mK to 10 W/mK.
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