Honeycomb structured body, method for manufacturing honeycomb structured body and exhaust gas purifying device

A method for manufacturing a honeycomb structured body, comprising:

• manufacturing a ceramic molded body through extrusion-molding, using a raw material paste containing a ceramic material as a main component, said ceramic molded body having a plurality of cells placed in parallel with one another in the longitudinal direction with a cell wall therebetween;
• manufacturing a plurality of porous ceramic members through manufacturing of said porous ceramic members by degreasing and firing said ceramic molded body, each of said porous ceramic members having a plurality of cells placed in parallel with one another in the longitudinal direction with a cell wall therebetween, an outer edge wall on an outer edge surface thereof, and corner portions of the cells defined either solely by said outer edge wall or by said outer edge wall and said cell wall;
• manufacturing a porous ceramic member aggregated body by aggregating said plurality of porous ceramic members by interposing an adhesive paste layer;
• and
• drying said adhesive paste layer to solidify said adhesive paste layer,
• wherein upon manufacturing said ceramic molded body, a filling body is provided in at least one corner portion of at least one outer most cell in each of the porous ceramic members using a die,
• a first profile of the outermost cell at a cross-section perpendicular to the longitudinal direction of said cells is approximately a tetragon, and
• a second profile of the outermost cell at the same cross-section perpendicular to the longitudinal direction of said cells is approximately a right triangle, and
• wherein a first length of one side of said right triangle is at least about 5% and at most about 40% of a second length of one side of said tetragon.

A method for manufacturing a honeycomb structured body, comprising:

• manufacturing a ceramic molded body through extrusion-molding, using a raw material paste containing a ceramic material as a main component, said ceramic molded body having a plurality of cells placed in parallel with one another in the longitudinal direction with a cell wall therebetween;
• manufacturing a plurality of porous ceramic members through manufacturing of said porous ceramic members by degreasing and firing said ceramic molded body, each of said porous ceramic members having a plurality of cells placed in parallel with one another in the longitudinal direction with a cell wall therebetween, an outer edge wall on an outer edge surface thereof, and corner portions of the cells defined either solely by said outer edge wall or by said outer edge wall and said cell wall;
• manufacturing a porous ceramic member aggregated body by aggregating said plurality of porous ceramic members by interposing an adhesive paste layer;
• and
• drying said adhesive paste layer to solidify said adhesive paste layer,
• wherein
• in said manufacturing of said porous ceramic members, a filling body is formed in at least one corner portion of at least one outer most cell in each of the porous ceramic members after manufacturing of said ceramic molded body,
• a first profile of the outermost cell at a cross-section perpendicular to the longitudinal direction of said cells is approximately a tetragon, and
• a second profile of the outermost cell at the same cross-section perpendicular to the longitudinal direction of said cells is approximately a right triangle, and
• wherein a first length of one side of said right triangle is at least about 5% and at most about 40% of a second length of one side of said tetragon.

An exhaust gas purifying device, comprising:

• a honeycomb structured body in which a plurality of porous ceramic members bonded together;
• an adhesive layer interposed between adjacent porous ceramic members, each of the porous ceramic members having a plurality of cells placed in parallel with one another in a longitudinal direction, cell walls interposed between adjacent cells, an outer edge wall on an outer edge surface thereof, corner portions of the cells defined either solely by said outer edge wall or by said outer edge wall and said cell wall, and a filling body disposed in at least one corner portion of at least one outermost cell in each of the porous ceramic members;
• a casing that covers the periphery of said honeycomb structured body;
• and
• a holding sealing material that is placed between said honeycomb structured body and said casing, one end of said casing at an exhaust gas inlet side being connected to an introducing pipe that is connected to an internal combustion system, the other end of said casing being connected to an exhaust pipe that is connected to the outside,
• wherein
• a first profile of the outermost cell at a cross-section perpendicular to the longitudinal direction of said cells is approximately a tetragon, and
• a second profile of the outermost cell at the same cross-section perpendicular to the longitudinal direction of said cells is approximately a right triangle, and
• wherein a first length of one side of said right triangle is at least about 5% and at most about 40% of a second length of one side of said tetragon.