Abstract: A honeycomb structure includes periphery honeycomb fired bodies which include at least a single piece of a periphery small honeycomb fired body having in the cross-section a cross-sectional area which is less than about 60% of a cross-sectional area of a single piece of the center-portion honeycomb fired body. A cross-sectional area of a periphery honeycomb bonded body in the cross-section is about 60% or more of the cross-sectional area of a single piece of the center-portion honeycomb fired body. The second adhesive layer is provided between the periphery small honeycomb fired body and the at least one piece of the honeycomb fired body. The second adhesive layer has thermal conductivity higher than thermal conductivity of a first adhesive layer. The second adhesive layer has Young's modulus higher than Young's modulus of the first adhesive layer. The center-portion honeycomb fired bodies are bonded together with the first adhesive layer.

Abstract: A pillar-shaped honeycomb structure has a plurality of cells longitudinally placed in parallel with one another with a wall portion therebetween, wherein the honeycomb structure mainly includes inorganic fibers which form the honeycomb structure without lamination interfaces.

Abstract: A honeycomb structure includes a plurality of honeycomb fired bodies and an adhesive layer. The plurality of honeycomb fired body has a longitudinal direction and a plurality of cell walls extending along the longitudinal direction to define a plurality of cells. The adhesive layer is provided between the plurality of honeycomb fired bodies to connect the honeycomb fired bodies. Pore diameters of pores in the adhesive layer are about 300 ?m or less. A ratio of a total area of pores having a pore diameter of at least about 50 ?m and at most about 300 ?m and an aspect ratio of at least about 1 and at most about 1.5 in a cross-section perpendicular to the longitudinal direction to a total area of pores having a pore diameter of at least about 50 ?m and at most about 300 ?m is about 90% or more.

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 structured body of the present invention is a pillar-shaped honeycomb structured body comprising a large number of through holes that are longitudinally placed in parallel with one another with a partition wall therebetween, wherein the large number of through holes include a group of large-capacity through holes being sealed at one of end portions so that the sum of areas on a cross section perpendicular to the longitudinal direction is made relatively larger, and a group of small-capacity through holes being sealed at the other end portion so that the sum of areas on the cross section is made relatively smaller, and the partition wall that separates the adjacent through holes constituting the group of large-capacity through holes is provided with a selective catalyst supporting portion used for selectively supporting a catalyst.

Abstract: A honeycomb structure is disclosed that includes plural honeycomb units bonded together by using a sealing material layer, each of the honeycomb units including plural through-holes separated by plural partition walls and provided in parallel along a longitudinal direction. Each of the honeycomb units includes at least ceramic particles, and inorganic fibers and/or whiskers; a cross sectional area of the honeycomb unit is from about 5 cm2 to about 50 cm2; and an outer surface of each honeycomb unit and the sealing material layer satisfy: about 0.5??/d×(dc/?c+df/?f)?about 1, where, ?f (W/mK) and df (mm) represent a thermal conductivity and a thickness of the outer surface of the honeycomb units, respectively, ?c (W/mK) and dc (mm) represent a thermal conductivity and a thickness of the sealing material layer, respectively, and ? (W/mK) and d (mm) represent a thermal conductivity and a thickness of the combination of the outer surface and the sealing material layer.

Abstract: An exhaust gas purification apparatus 10 includes an engine 20, a manifold 22 connected to the engine 20 and through which exhaust gas generated by burning fuel flows, and a casing 26 connected to the manifold 22 and holding a honeycomb filter 30 with a catalyst carried thereon. In the exhaust gas purification apparatus 10, the honeycomb filter 30 is disposed in a position such that the length of an exhaust gas route between the uppermost upstream portion of the manifold 22 through which exhaust gas flows and the head portion of the honeycomb filter 30 is about 1 m or less. The honeycomb filter 30 has a porosity of about 70% or more.

Abstract: An object of the present invention is to provide a honeycomb structural body for use in a filter, which can be provided with a large amount of catalyst, can suppress an increase in pressure loss upon collecting particulates, can have a high particulate collecting capability and can efficiently carry out a regenerating process and a toxic gas purifying process. The honeycomb structural body of the present invention is a pillar-shaped honeycomb structural body that is mainly composed of inorganic fibers and has a structure in that a large number of through holes are placed in parallel with one another in the length direction with a partition wall interposed therebetween. Herein, the inorganic fibers, which form the honeycomb structural body, are arranged in such a manner that more fibers are aligned along a face perpendicular to the forming direction of the through holes rather than aligned along a face in parallel with the forming direction of the through holes.

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 which makes it possible to prevent a thermal stress from concentrating on plugs for sealing a group of inlet-side through holes and the vicinity thereof during a regenerating process, and consequently to prevent occurrence of cracks. The honeycomb structural body of the present invention is a pillar-shaped honeycomb structural body mainly made of porous ceramics, in which a plurality of through holes are placed in parallel with one another in the length direction with a partition wall interposed therebetween. Herein, the through holes are constituted by a group of inlet-side through holes, whose ends are sealed by plugs at the outlet side such that the total sum of areas on cross sections perpendicular to the length direction is made relatively greater, and a group of outlet-side through holes, whose ends are sealed by plugs at the inlet side such that the total sum of areas on the cross sections thereof is made relatively smaller.

Abstract: A honeycomb structural body comprises one or plural pillar-shaped porous ceramic members in which many through-holes are arranged side by side in a longitudinal direction through partition walls and either one end portions of these through-holes are sealed. The partition wall forming the structural body has a surface roughness of not less than 10 ?m as a maximum roughness Rz defined in JIS B0601-2001 and an average pore size of 5-100 ?m in a pore distribution measured by a mercury pressure method, and satisfies the following relationship: A?90?B/20 or A?100?B/20 when a ratio pores having a pore size of 0.9-1.1 times the average pore size to total pore volume is A (%) and a thickness of the partition wall is B (?m), and there is proposed an effective honeycomb structural body having excellent pressure loss and catching efficiency and a high catalyst reactivity.

Abstract: A porous body includes skeleton particles directly binding with each other and forming inner surfaces and void spaces, each of the skeleton particles being one of a nitride ceramic, a carbide ceramic and an oxide ceramic, and inorganic compound components bound to the inner surfaces formed by the skeleton particles directly bound with each other and including an inorganic compound formed by calcinating pore forming particles including an organic polymer and inorganic particles being one or more inorganic material of a nitride ceramic, a carbide ceramic, an oxide ceramic, a metal and a metal compound. The ceramic of the skeleton particles is different from the inorganic compound of the inorganic compound components.

Abstract: A honeycomb structure is a pillar-shaped honeycomb structure in which a plurality of cells, separated from each other by a cell wall, are formed in a longitudinal direction. When the honeycomb structure is divided into two portions by a plane in parallel with either one of end faces in the longitudinal direction of the honeycomb structure so that apparent volumes of the respective two portions become equal to each other, the respective two portions have apparent densities different from each other.

Abstract: An object of the present invention is to provide a honeycomb structural body for use in a filter, which can support a large amount of catalysts, can suppress increase in pressure loss upon collecting particulates, can have a high particulate collecting capability and can efficiently carry out a regenerating process and a toxic gas purifying process. The honeycomb structural body according to the present invention is a pillar-shaped honeycomb structural body having a structure in which a plurality of through holes are placed in parallel with one another in the length direction with a partition wall interposed therebetween, wherein lamination members are laminated in the length direction so that the through holes are superposed on one another, and one of ends of each through hole is sealed.

Abstract: A honeycomb structure includes a ceramic block formed by bonding a plurality of pillar-shaped honeycomb fired bodies by interposing an adhesive layer therebetween, and a sealing material layer provided on the periphery of the ceramic block. Each of the honeycomb fired bodies has a large number of cells disposed in parallel with one another in a longitudinal direction with a cell wall therebetween. The adhesive layer and the sealing material layer are integrally formed with substantially no interface to divide the two layers.

Abstract: A sintering aid for promoting sintering of ceramic particles and fine particles that are the same materials as ceramic particles and have smaller average particle diameter are mixed to obtain a puddle. The average particle diameter of ceramic particles is preferably about in a range of 5 to 100 ?m; the average particle diameter of the fine particles is preferably about in a range of 0.1 to 1.0 ?m, and the average particle diameter of the sintering aid is preferably about in a range of 0.1 to 10 ?m. As the sintering aid, for example, alumina is used. This puddle is extrusion molded into a honeycomb shape and the molded object is fired at a firing temperature lower than a temperature for sintering without mixing a sintering aid. The thermal conductivity of the obtained honeycomb structure 10 shows about 60% or more of the thermal conductivity of a fired body fired without adding a sintering aid to ceramic particles and shows about 12 W/m·K or more at 20° C.

Abstract: The honeycomb structured body of the present invention is a honeycomb structured body in which a plurality of porous ceramic members are combined with one another through an adhesive layer, each of the porous ceramic members having a plurality of cells which are allowed to penetrate in a longitudinal direction with a wall portion therebetween and either one end of which is sealed, with a catalyst supporting layer being adhered to the wall portion, wherein an average pore diameter of the porous ceramic member is larger than an average particle diameter of particles constituting the catalyst supporting layer, and when a pore diameter distribution of the porous ceramic member and a particle diameter distribution of particles constituting the catalyst supporting layer are drawn with the pore diameter and the particle diameter being on the same axis, a pore volume in an overlapped area of both the distributions is about 10% or less to the entire pore volume of the porous ceramic member.

Abstract: A honeycomb filter includes a honeycomb fired body having cells longitudinally disposed either end of each cell being sealed. The honeycomb filter includes an outlet-side catalyst supporting area, an inlet-side catalyst supporting area, and a catalyst unsupporting area formed between the catalyst supporting areas. A thermal conductivity of the catalyst unsupporting area is larger than those of the catalyst supporting areas. Y (%), Z (%), and X (%) satisfy the following inequalities, about 1?Y?about 19, (880?70Y)/9?Z?(825?15Y)/9 (about 1?Y?about 10), (330?15Y)/9?Z?(1375?70Y)/9 (about 10?Y?about 19), and X=100?Y?Z in which Y, Z, X indicate a ratio of a length of the outlet-side catalyst supporting area, the inlet-side catalyst supporting area, the catalyst unsupporting area, respectively, to an entire length of the honeycomb filter.

Abstract: A catalyst supporting honeycomb including a pillar-shaped honeycomb structure having a plurality of cells formed in parallel with one another in a longitudinal direction with a cell wall interposed therebetween, and catalyst particles supported on the honeycomb structure. The catalyst particles include an oxide catalyst, an average particle diameter of which is at least about 0.05 ?m and at most about 1.00 ?m.

Abstract: A catalyst supporting honeycomb includes a pillar-shaped honeycomb structure and catalyst particles supported on the honeycomb structure. The honeycomb structure includes cell walls extending in a longitudinal direction of the honeycomb structure to define a plurality of cells extending in the longitudinal direction. The plurality of cells include large-volume cells having first opening ends and second closing ends opposite to the first opening ends along the longitudinal direction, and small-volume cells having first closed ends and second opening ends opposite to the first closed ends along the longitudinal direction. Total cross sectional areas of the large-volume cells on a plane perpendicular to the longitudinal direction are larger than total cross sectional areas of the small-volume cells on the plane. The catalyst particles include an oxide catalyst having an average particle diameter of at least about 0.05 ?m and at most about 1.00 ?m.