Ngk Insulators, Inc.

Ayaka Sakai

Satoshi Sakashita

Hiroyuki Nagaoka

Yuichi Tajima

Yuji Sasaki

Shingo Sokawa

Yasuyuki Furuta

Fumihiko Yoshioka

Tatsuya Ohashi

Ritsuko Teranishi

A honeycomb filter comprising a pillar-shaped honeycomb structure body having a porous partition wall and a plugging portion, wherein, in a pore diameter distribution of the partition wall, in the case where the pore diameter (μm) whose cumulative pore volume is 10% of the total pore volume is denoted by D10, the pore diameter (μm) whose cumulative pore volume is 50% of the total pore volume is denoted by D50, and the pore diameter (μm) whose cumulative pore volume is 90% of the total pore volume is denoted by D90, all of the following equations (1) to (6) are satisfied.8.4 μm<10  (1)17.5 μm<50<24.0 μm  (2)90<55.2 μm  (3)(log90−log10)/log50<0.60  (4)log90/log50<1.30  (5)log50/log10<1.38  (6)

Honeycomb filter

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

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

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).

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Nagoya, Japan

Ayaka Sakai