Abstract: A honeycomb structure is provided that includes a plurality of pillar-shaped honeycomb fired bodies, each having a number of cells longitudinally disposed in parallel with one another with a cell wall therebetween. An adhesive layer is interposed between adjacent honeycomb fired bodies of the plurality of honeycomb fired bodies to combine the plurality of honeycomb fired bodies together, and a sealing material layer is formed on an outer peripheral face of the combined plurality of honeycomb fired bodies. At least two honeycomb fired bodies of the plurality of honeycomb fired bodies have an outer wall that forms a portion of the outer peripheral face of the combined plurality of honeycomb fired bodies. At least one of the outer walls has a protruding portion extending from a surface thereof, and the protruding portion is made from a same material as a material of the at least one outer wall.

Abstract: The honeycomb structure includes a plurality of cells longitudinally placed in parallel with one another with a cell wall therebetween, and a catalyst supported by the cell wall. The cell wall is formed of inorganic particles, inorganic fiber matter, and inorganic binder. Aan area of the cell wall occupied by the catalyst that is supported by a surface of the inorganic fiber matter is about 5% or less of a sum of an area of the cell wall occupied by the catalyst that is supported by a surface of the inorganic particles, the area of the cell wall occupied by the catalyst that is supported by the surface of the inorganic fiber matter, and an area of the cell wall occupied by the catalyst that is supported by a surface of the inorganic binder.

Abstract: A method for manufacturing a honeycomb structure includes a molding step of manufacturing a pillar-shaped honeycomb molded body by using a raw material composition, and a firing step of carrying out a firing treatment on the honeycomb molded body to manufacture a honeycomb fired body. The pillar-shaped honeycomb molded body has a large number of cells disposed in substantially parallel with one another in a longitudinal direction with a cell wall therebetween. The raw material composition includes inorganic particles, at least one of inorganic fibers and inorganic whiskers, and an inorganic binder. The inorganic particles include secondary particles formed by an agglomeration of primary particles. An average particle diameter of the inorganic binder in the raw material composition is about 1/200 to about 1/40 of an average particle diameter of the inorganic particles.

Abstract: A pillar-shaped honeycomb structure having a plurality of cells formed by laminating a plurality of lamination members with a plurality of through holes. The plurality of through holes form the plurality of cells. The lamination members are a substantially disc shaped. A plane portion, a protruding portion, or a cut-out portion is formed on a peripheral side face of the lamination member, or a rod member is inserted in at least one cell of the plurality of cells, where the rod member penetrates from one end to the other end of the cell.

Abstract: The pore forming material for a porous body of the present invention comprises organic polymer particles and inorganic particles. As the embodiment thereof, there may be mentioned one having a structure in which the inorganic particles are contained in the organic polymer particles, and an aggregate body of the organic polymer particles and the inorganic particles. The inorganic particles may be inorganic micro-balloons, and the organic polymer particles may be organic micro-balloons.

Abstract: A pore forming material for a porous body includes organic polymer particles and inorganic particles.

Abstract: An integral honeycomb filter assembly is produced by adhering ceramic seal layer outer surfaces of a plurality of honeycomb filters. Each of the plurality of honeycomb filters has a plurality of cells defined by a cell wall, and purifies fluid including particulates with the cell wall. 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 for each honeycomb filter is 0.06 to 0.75 mm/mm2. 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 for the integral honeycomb filter assembly is 0.06 to 0.75 mm/mm2.

Abstract: A method for manufacturing a honeycomb structure includes manufacturing a pillar-shaped honeycomb molded body having a large number of cells disposed in substantially parallel with one another in a longitudinal direction with a cell wall therebetween by using a raw material composition. The raw material composition includes inorganic particles, at least one of inorganic fibers and inorganic whiskers, and an inorganic binder. The method further includes carrying out a firing treatment on the honeycomb molded body to manufacture a honeycomb fired body. An average particle diameter of the inorganic binder in the raw material composition is about 10 to about 50 nm.

Abstract: A method for manufacturing a honeycomb structure includes mixing inorganic particles, at least one of inorganic fibers and inorganic whiskers, and an inorganic binder solution to prepare a raw material composition. The method further includes manufacturing a pillar-shaped honeycomb molded body by extrusion-molding the raw material composition, and firing the molded body to manufacture a honeycomb fired body. The molded body has a large number of cells disposed in substantially parallel with one another in a longitudinal direction with a cell wall therebetween. A blending amount of the inorganic binder solution is about 30 to about 60% by weight to the total amount of the inorganic particles, at least one of the inorganic fibers and the inorganic whiskers, and the inorganic binder solution. A concentration of the inorganic binder solution is about 35 to about 50% by weight.

Abstract: A method for inspecting a honeycomb fired body includes transporting the honeycomb fired body along a transportation line, and inspecting the honeycomb fired body for a crack during the transporting step.

Abstract: An object of the present invention is to provide a honeycomb structural body (filter) which has a low pressure loss upon collecting particulates, makes it possible to deposit a great amount of particulates and ashes, and is less likely to produce cracks.

Abstract: A honeycomb filter includes a honeycomb structure in which a plurality of cells are placed in parallel with one another in the longitudinal direction with a cell wall therebetween; and a cylindrical metal casing that covers the outer peripheral side face of the honeycomb structure. A shortest distance between the outermost cells among the plurality of cells and the inner face of the metal casing is at least about 1 mm and at most about 3 mm.

Abstract: A honeycomb structure includes large-volume cells and small-volume cells with a cell wall therebetween; a plug sealing at either one of end portions of the cells; and a catalyst supported on the cell wall. The large-volume cell has a larger cross-sectional area perpendicular to its longitudinal direction than that of the small-volume cell. The large-volume cell is sealed at one end portion of the honeycomb structure, while the small-volume cell is sealed at the other end portion of the honeycomb structure. The catalyst is supported only on the cell walls forming the large-volume cells, or on both of the cell walls forming said large-volume cells and the cell walls forming said small-volume cells. An amount of the catalyst supported on the cell walls forming the large-volume cells is larger per unit volume than that on the cell walls forming the small-volume cells.

Abstract: The invention provides a filter that has a plurality of through holes and satisfies the expression 2.5×A/B+52.5?C?2.5×A/B+60.2 (A?20, 0<B?20), where A(%) represents the ratio of pores with a pore diameter of 10 ?m or less to the total pore volume in a wall part between the through holes; B(%) represents the ratio of pores with a pore diameter of 30 ?m or more to the total pore volume in the wall part; and C(%) represents the aperture ratio of a plane perpendicular to the through holes.

Abstract: A filter has a honeycomb structural body having a plurality of large-capacity through holes and small-capacity through holes placed in parallel with one another in a length direction. A total (a) of lengths in the cross section of wall surfaces of one large-capacity through hole, the wall surfaces being shared by the one large-capacity through hole and adjacent large-capacity through holes to a total (b) of lengths in the cross section of wall surfaces of one large-capacity through hole, the wall surfaces being shared by the one large-capacity through hole and adjacent small-capacity through holes is defined as ?. A ratio (A/B) of the area (A) of the cross section of the one large-capacity through hole to the area (B) of the cross section of one of the adjacent small-capacity through holes is defined as ?. The ? and ? satisfy the relationship represented by the formulas: 0<??1.5 and 2<??2.75, and ??(20/9)?2+.

Abstract: An object of the present invention is to provide a honeycomb structural body (filter) which has a low pressure loss upon collecting particulates, makes it possible to deposit a great amount of particulates and ashes, and is less likely to produce cracks.

Abstract: A honeycomb structural body which is capable of increasing the limiting collection amount of particulate, reducing the pressure loss in use, and reducing fluctuations in the pressure loss even if the flow rate from an internal combustion engine of exhaust gases fluctuates. The honeycomb structural body is a columnar honeycomb structural body in which a large number of through holes are arranged side by side in the length direction with a partition wall interposed therebetween. The large number of through holes are constituted by a group of large-capacity through holes, with one end thereof sealed to make the total cross-sectional areas perpendicular to the length direction relatively greater, and a group of small-capacity through holes, with the other end thereof sealed to make the total cross-sectional areas relatively smaller. The honeycomb structural body includes a plurality of columnar porous ceramic members.

Abstract: Ceramic particles, fine particles having smaller average particle diameter smaller than that of the ceramic particles and a reduction-resistant material are mixed to obtain a puddle. The reduction-resistant material is a material that is reduced by carbon at a higher temperature as compared with a temperature at which an oxide (for example, silica) of an element contained in the ceramic particles is reduced. The average particle diameter of the ceramic particles is preferably about in a range of 5 to 100 ?m and the average particle diameter of the fine particles is preferably about in a range of 0.1 to 10 ?m. The reduction-resistant material is, for example, alumina. This puddle is extrusion molded into a honeycomb filter and the molded object is sintered at about 1600 to 2200° C.

Abstract: A method of manufacturing a porous sintered body includes mixing at least two groups of silicon carbide particles and a pore forming material having an average particle diameter Y ?m to obtain a molding material. The at least two groups of silicon carbide particles have different average particle diameters and have a first group of silicon carbide particles whose blending quantity by weight in the molding material is greatest among the at least two groups of silicon carbide particles. The first group have an average particle diameter X ?m. The relationships 15?X, 0.5·X?Z?0.9·X, and 0.8·Z?Y?1.8·Z are satisfied, wherein Z ?m is an average pore diameter of the porous sintered body no less than 10 ?m and no greater than 20 ?m.

Abstract: An inorganic fiber aggregate includes an inorganic material and inorganic fibers on which the inorganic material is provided to fix the inorganic fibers each other.