Abstract:
A hexagonal-cell honeycomb carrier body, made of cordierite ceramic, for use in a carrier of a catalyst of purifying exhaust gas is disclosed as including a large number of hexagonal cells surrounded with cell walls formed in a hexagonal lattice pattern and a cylindrical skin layer covering outer circumferential sidewalls of the hexagonal cells. The hexagonal-cell honeycomb carrier body has GSA (Geometric Surface Area) of 3.5 mmW or more. A hexagonal-cell honeycomb catalyst body comprises the hexagonal-cell honeycomb carrier body and a catalyst layer which covers a surface of the hexagonal-cell honeycomb carrier body.
Abstract:
A diesel particulate filter comprising a plugged, wall-flow honeycomb filter body composed of cordierite and having a plurality of parallel end-plugged cell channels traversing the body from a frontal inlet end to an outlet end thereof, wherein the filter exhibits a CTE (25-800˚C) of less than 13x10 /˚C, a bulk filter density of less than 0.60 g/cm , a median pore diameter, d50, of less than 25 micrometers, a porosity and pore size distribution that satisfy the relationship Pm (%porosity/100)]} + 0.0366183(d90) - 0.00040119(d90) + 0.468815(100/%porosity) + 0.0297715(d50) + 1.61639(d50-d10)/d50, wherein d10, and d90 are pore diameters at 10% and 90% of the pore size distribution on a volumetric basis, and d10
Abstract:
A honeycomb filter for exhaust gas decontamination that can reduce any thermal stress generated by local temperature changes, and that is free from cracking and is excellent in strength, durability and temperature rise characteristics. Further, there are provided an adhesive of low heat capacity that can reduce any thermal stress generated; a coating material of low heat capacity that is excellent in heat insulation and can reduce any thermal stress generated; and a process for producing a honeycomb filter for exhaust gas decontamination wherein an enhancement of outline dimensional precision can be attained and breakages during the manufacturing process can be decreased. In particular, a honeycomb filter for exhaust gas decontamination, comprising a plurality of columnar porous ceramic members bound by means of an adhesive layer, the columnar porous ceramic members each comprising a multiplicity of through-holes having bulkheads interposed therebetween and arranged in longitudinal direction in parallel relationship, the bulkheads interposed between the through-holes capable of functioning a particle trapping filter, characterized in that the thermal expansion coefficient (alphaL) of the adhesive layer and the thermal expansion coefficient (alphaF) of the porous ceramic members satisfy the relationship: 0.01
Abstract:
A honeycomb structure body (1) in which a plurality of honeycomb segments (12) are integrated through connection layers (8), the honeycomb segments each having a large number of axially penetrating circulation holes (3) divided by porous separation walls (2). The honeycomb structure body is characterized in that each connection layer (8) includes one or more bonding layers (10) and one or more foundation layers (9) interposed between the honeycomb segment (12) and the bonding layer (10). A method for manufacturing the honeycomb structure body (1) is characterized in that the steps of bonding the honeycomb segments (12) include a step of applying at least one layer of a foundation agent on the honeycomb segments (12), a step of applying at least one layer of a bonding agent, and a step of bonding and integrating the honeycomb segments. Provided are the honeycomb structure body having high bonding strength and less likely to have failure such as cracks in bonded portions, and the method for manufacturing the honeycomb structure body.
Abstract:
A honeycomb filter (1), comprising a plurality of honeycomb segments (12) having a large number of flow holes (3), partitioned by partition walls (2) and passing in the axial direction thereof, and formed integrally with each other, characterized in that the heat conductivity and the strength or strength/Young's modulus of the honeycomb segments (12 1 ) disposed at the center part are higher than those of the honeycomb segments (12 0 ) disposed on the outer peripheral part, or the porosity, an average pore−size, or a (porosity x (average pore−size) 2 ) at the wall portion is smaller than that at the other portions, whereby the filter can be used as an exhaust emission particulate collection filter, an excellent regenerative efficiency can be provided, and high durability and low pressure loss can be achieved concurrently.
Abstract:
A honeycomb structure which has a large number of through holes penetrating in the direction of the axis partitioned by bulkheads, comprises refractory particles as an aggregate and metallic silicon, and is porous. The honeycomb structure can be suitably used as a filter for clarifying an emission gas from an automobile even under high SV conditions after being subjected to treatments such as sealing and carrying a catalyst.
Abstract:
A honeycomb structure (10) having a number of axially penetrating distribution holes (15) partitioned by partition walls (14), the partition walls (14) for the distribution holes(15) having a filtration ability, one of the respective ends of predetermined distribution holes being closed, the other ends of the remaining distribution holes being closed. The distribution holes (15) have a triangular cross sectional shape, and the density of the distribution holes (15) is less than 54.3 cells/cm . The honeycomb structure produces less thermal stress during use, has the durability to prevent cracking, and suffers a less loss of fluid pressure.
Abstract translation:一种蜂窝状结构体(10),其具有分隔壁(14)的多个轴向贯通分配孔(15),用于分配孔(15)的分隔壁(14)具有过滤能力,预定的各个端部之一 分配孔关闭,剩余分配孔的另一端关闭。 分配孔(15)具有三角形横截面形状,分配孔(15)的密度小于54.3个/ cm 2。 蜂窝结构在使用过程中产生较少的热应力,具有防止开裂的耐久性,并且承受较少的流体压力损失。
Abstract:
A method to form a laminar integral skin of a honeycomb structure is provided. The method includes extruding a ceramic precursor batch through a die with feedholes in entry side and slots in exit face of the die to form the honeycomb structure. In a region on the periphery of the die configured to form the cell matrix, a series of concentric slots around the matrix in the exit face of the die are configured to feed skin onto the matrix. Ring sections between concentric slots are angled away from the center and a mask is disposed on top of the periphery producing a channel for extruded skin to meet and bond to extruded matrix. Optionally, slots in the skin-forming ring sections enhance knitting between laminar skin layers. The die and honeycomb body having uniform integral skin are also provided.
Abstract:
An article, includes a porous ceramic honeycomb body and a housing disposed on at least one of an outer periphery of the porous ceramic honeycomb body and opposing end faces of the porous ceramic honeycomb body, wherein the housing exerts a compressive force on the porous ceramic honeycomb body in at least one of radial direction and axial direction. A method of making the article, includes heating to greater than or equal to about 200C the housing, crimping the housing tightly around the honeycomb body while the housing is greater than or equal to about 200C, and cooling the housing. The housing exerts a compressive force on the porous ceramic honeycomb body in at least one of radial direction and axial direction by shrinking on cooling more than the honeycomb body.