Ngk Insulators, Inc.

Satoshi Sakashita

Hiroyuki Nagaoka

Shingo Sokawa

Toshihiro Hirakawa

Yoshimasa Omiya

Ayaka Sakai

Masayuki Uchida

Yukio Miyairi

Kenji Suzuki

Toshio Yamada

Hideyuki Suzuki

Manabu Isomura

Shogo Hirose

Makoto Teranishi

Yuichi Tajima

Shuji Ueda

Masaaki Ito

Hirotaka Yamamoto

Naoki Yoshida

Kazuya Mori

Akifumi Kawakami

Rishun Kin

Takayuki Ogata

Norihisa Fujie

Mitsuharu Ono

Norihiro Wakida

Takahiko Nakatani

Takehide Shimoda

Shiori Nakao

Mitsuo Takahashi

Yuki Fukumi

Risyun Kin

Yuichiro Watanabe

Shinji Ishida

A method for producing a porous body, comprising a raw-material mixing step of mixing talc having an average particle size of 1 &#x3bc;m or more and 18 &#x3bc;m or less, alumina, an auxiliary raw material containing a material that undergoes a eutectic reaction with talc and being prepared in an amount so as to satisfy a weight ratio of 0.5% or more and 1.5% or less by weight relative to the talc, and a pore-forming agent, to provide green body, and a molding and firing step of molding the green body to provide a compact and firing this compact at a firing temperature of 1350&#xb0; C. to 1440&#xb0; C.

Method for producing porous body

In a porous body, a surface layer thickness Ts takes a relatively small value satisfying P&#x2265;0.54 Ts (formula (1)), the surface layer thickness Ts being derived by a microstructure analysis using the porous-body data that is prepared through three-dimensional scanning of a region including a surface (inflow plane) of the porous body. Here, P denotes a porosity [%] of the porous body, and 0%&#x3c;P&#x3c;100% and 0 &#x3bc;m&#x3c;Ts are assumed. The surface layer thickness Ts is derived as a distance in a thickness direction (X direction) between a surface-layer region start planein which a straight-pore opening ratio becomes 98% or less for the first time and a surface-layer region end planein which the straight-pore opening ratio becomes 1% or less for the first time.

Porous body, honeycomb filter, microstructure analysis method, program for same, and microstructure analyzer

Object information representing a honeycomb structure with a plurality of meshes is obtained, and an inner-wall-surface heat transfer coefficient h, i.e., a heat transfer coefficient between an inner wall surface of a cell and a fluid, is derived as follows. First, one of the meshes as a target for derivation of the inner-wall-surface heat transfer coefficient his set (S), and a dimensionless coordinate X* is derived on the basis of position information (X-coordinate) of the set mesh and fluid state information (S). An inner-wall-surface dimensionless heat transfer coefficient Nucorresponding to the derived dimensionless coordinate X* is then derived on the basis of the inner-wall-surface dimensionless correspondence information (Sto S). The inner-wall-surface heat transfer coefficient hin the mesh set as the derivation target is then derived on the basis of the derived inner-wall-surface dimensionless heat transfer coefficient Nu(S).

Method for analyzing honeycomb structure, and program and analysis device for the same

A method for manufacturing a honeycomb structure according to the present invention is a method for manufacturing a honeycomb structure provided with partitions forming a plurality of cells. This manufacturing method includes a structure formation process including a pore-forming material placement step of placing a pore-forming material for forming pores in the partitions, a raw material placement step of placing tabular grains and raw material grains such that the tabular grains are arranged in a predetermined direction with respect to the partition surfaces while the tabular grains and the raw material grains constitute a raw material for forming the partitions, and a sintering step of sintering the placed raw material. The honeycomb structure is produced by repeating the structure formation process a plurality of times.

Method for manufacturing honeycomb structure, apparatus for manufacturing honeycomb structure, and honeycomb structure

A CPU of an analysis apparatus performs a fluid analysis and derives transient distribution information that represents an accumulation distribution of a particulate layer on an inflow-side inner circumferential surface of a honeycomb structure at a time point after a short time interval &#x394;t (step S). The CPU then repeatedly performs a fluid analysis by taking into account the transient distribution information derived previous time to repeatedly derive transient distribution information (steps Sto S) and then derives post-transient-analysis distribution information that represents the accumulation distribution of the particulate layer at a later time point (step S).

Pressure loss analysis method, a non-transitory computer readable medium, and a pressure loss analysis apparatus for analyzing pressure loss in a honeycomb structure

A method for manufacturing a porous body includes a structure forming step that is repeatedly performed a plurality of times and includes: a pore-forming material placing step of placing a pore-forming materialfor forming pores in the porous body; an aggregate placing step of placing aggregate particleswhich are part of raw materials of the porous body; a binder placing step of placing binder particleswhich are part of the raw materials of the porous body; and a binding step of heat-fusing at least part of the placed binder particlesto bind aggregate particlestogether.

Method and apparatus for manufacturing porous body

A honeycomb structural bodycomprises a porous partition portionwhich forms a plurality of cells each functioning as a flow path of a fluid, and in the partition portion, the average pore diameter is 10 to 20 &#x3bc;m, and a wet area rate R (=S/V) which is the rate of a wet area S of pores to a volume V of the partition portionis 0.000239 &#x3bc;mor more.

Honeycomb structural body and method for manufacturing the same

A porous body constituting a porous partition wallof a honeycomb filterhas a porosity P of 20% to 60%, a permeability k of 1 &#x3bc;mor more and satisfies k&#x2265;0.2823 P&#x2212;10.404. The porous body is obtained by a method for producing, for example, includes (a) a step of acquiring porous body data representing a temporary porous body having porosity higher than target porosity, (b) a step of deriving information about a flow rate for each space voxel during passage of a fluid through inside of the porous body, (c) a step of preferentially replacing the voxel having a low flow rate among the space voxels with the object voxel, and adjusting the porosity of the porous body data to the target porosity, and (d) a step of forming a porous body based on the porous body data after replacement.

Porous body, honeycomb filter, method for producing porous body, and method for producing honeycomb filter

A method for analyzing a microstructure of a porous body is, for example, a method using porous-body data in which positional information providing a position of a voxel of a porous body obtained by three-dimensional scanning is associated with voxel type information including information that allows determination as to whether the voxel is a spatial voxel representing a space or an object voxel representing an object. This method includes (a) a step of defining an imaginary surface that is in contact with at least one object voxel present on a surface of the porous body, and identifying, as opening-related voxels, spatial voxels that are in contact with the imaginary surface and spatial voxels that continuously lie in a linear direction from the imaginary surface; and (b) a step of analyzing a microstructure of the porous body on a basis of the opening-related voxels.

Method for analyzing microstructure of porous body, and program and microstructure analyzer for the same

A ceramic body is heated to a predetermined temperature by using a furnace, and a cooling gas is ejected toward a first end face of the ceramic body so that the first end face of the ceramic body is cooled. At this time, the temperature of the first end face of the ceramic body is measured by a radiation thermometer provided on the same side from which the cooling gas is ejected, and the internal temperature is measured by a thermocouple provided in the ceramic body. Thereafter, a thermal shock resistance test in which actual use conditions are simulated is performed by obtaining the temperature gradient of the ceramic body from measurement results of the temperature of the first end face of the ceramic body and the internal temperature and checking the absence or presence of cracks that occurs to the ceramic body.

Thermal shock resistance testing method and thermal shock resistance testing apparatus

A holding jig has a tubular jig base member, and a tubular expansion/contraction member disposed on an inner peripheral surface side of the tubular jig base member. Both end sides of the tubular expansion/contraction member are fixed to both end sides of the tubular jig base member along the whole periphery. A configuration of an inner peripheral surface of the tubular expansion/contraction member is smaller than a surface configuration of a pillar-like body (a honeycomb structure) to be held. On the other hand, a configuration of an inner peripheral surface of the tubular jig base member is larger than the surface configuration of the pillar-like body (the honeycomb structure) to be held.

Holding jig and pressure loss measuring device

A honeycomb catalyst body includes a tubular honeycomb base material having porous partition walls to define and form a plurality of cells extending as through channels of a fluid from one end surface from which the fluid flows in to the other end surface from which the fluid flows out, and a catalyst loaded onto the partition walls. In the honeycomb base material, at least one slit which is open in a side surface of the honeycomb base material is formed, and a width of the slit is from 1.0 to 10.0 mm.

Honeycomb catalyst body

Filter for removing particle matter

Plural of virtual curved surface solids, each of which is a curved surface solid formed by a combination of plural of virtual spheres, is placed so as to fill in space voxels, referring to porous-body data in which positional information is associated with voxel-type information (step S). Information regarding a flow rate for each space voxel when a fluid passes through a porous body is derived by executing a fluid analysis based on the porous-body data (step S). A flow-rate-weighted mean diameter Ru, which is a weighted average obtained by weighting an equivalent diameter R'for each virtual curved surface solid with a volume Vand an average flow rate Ufor each virtual curved surface solid, is derived based an information regarding the virtual curved surface solids and information regarding the flow rate for each space voxel (step S).

Microstructure analysis method, program for same, and microstructure analysis apparatus

A plugged honeycomb structure including a honeycomb structure body, outflow side plugged portions, and inflow side plugged portions. A shape of cells in a cross section is a hexagonal shape. Among six corner portions of each of the hexagonal cells, the corner portion between two partition walls at least one of which is the partition wall separating inflow cells or outflow cells from each other is a specific corner portion, and the corner portion between the two partition walls each of which is the partition wall separating the inflow cell and the outflow cell is an unspecific corner portion. At least one of the specific corner portions is provided with a reinforcing portion so that a shape of the specific corner portion is rounded, and the unspecific corner portions are not provided with the reinforcing portions.

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Yokkaichi, Japan

Satoshi Sakashita