Ngk Insulators, Inc.

Takahiro Kondo

Yasushi Kato

Junki Matsuya

Takahiro Honda

Yukio Miyairi

Yukihito Ichikawa

Shogo Hirose

Akihiro Mizutani

Koji Nagata

Makoto Teranishi

Suguru Kodama

Yoichi Aoki

Akifumi Nishio

Makoto Miyazaki

Yudai Kurimoto

Yuichi Hamazaki

Masahiro Shirai

Atsushi Mizuno

Yasushi Uchida

Hideyuki Toyoshima

A honeycomb structure includes a honeycomb structure body having porous partition walls, wherein a value of a porosity of the partition wall in a partitioning wall portion between the two cells is defined as a porosity A, a value of a porosity of the partition wall in an intersecting portion that is a region connecting two or more wall portions is defined as a porosity B, a value of A/B obtained by dividing the porosity A by the porosity B is from 0.5 to 0.95, and the porosity A is from 10 to 40%.

Honeycomb structure

A honeycomb filter includes a plugged honeycomb structure body which has cell rows arranged along one direction, in a cross section of the honeycomb structure body and including a first cell row constituted of at least one of an inflow cell and an outflow cell, and a through-cell, and a second cell row including no through-cells. A width P(mm) of the first cell row, a width P(mm) of the second cell row and a curvature radius R (&#x3bc;m) of a curved shape of corner portions of a polygonal shape of each cell satisfy a relation of Equation (1) below: Equation (1): 0.4 (R/1000)/((P+P)/2) 100 20.

Honeycomb filter

A honeycomb filter includes a plugged honeycomb structure body which has cell rows arranged along one direction in a cross section of the honeycomb structure body and including a first cell row in which at least the inflow cells are included and in which in the cross section perpendicular to the extending direction of the cells, a through channel area SA occupied by the inflow cells is larger than a through channel area SB occupied by the outflow cells, and a second cell row in which at least the outflow cells are included. A width P(mm) of the first cell row, a width P(mm) of the second cell row and a curvature radius R (&#x3bc;m) of a curved shape of corner portions of a polygonal shape of each cell satisfy a relation of Equation (1) below: Equation (1): 0.4&#x2264;(R/1000)/((P+P)/2)&#xd7;100&#x2264;20.

A honeycomb filter includes a honeycomb structure body having porous partition walls arranged to surround cells, in a cross section of the honeycomb structure body which is perpendicular to an extending direction of the cells, a value of a porosity of the partition wall in a partitioning region between the inflow cell and the outflow cell is defined as a porosity A, among intersecting portions where partitioning regions of the partition walls between the cells intersect one another, a value of a porosity of the partition wall in an intersecting portion between the two inflow cells is defined as a porosity B, and a value of A/B obtained by dividing the porosity A by the porosity B is from 0.50 to 0.95.

A honeycomb filter includes a plugged honeycomb structure body which has cell rows arranged along one direction in a cross section of the honeycomb structure body and including a first cell row constituted of inflow cells and a second cell row including outflow cells. A width P(mm) of the first cell row, a width P(mm) of the second cell row and a curvature radius R (&#x3bc;m) of a curved shape of corner portions of a polygonal shape of each cell satisfy relations of Equations (1) and (2) below: Equation (1): 2&#x2264;100&#x2212;(P/P&#xd7;100)&#x2264;50, and Equation (2): 0.4&#x2264;(R/1000)/((P+P)/2)&#xd7;100&#x2264;20.

A honeycomb filter includes a plugged honeycomb structure body which has cell rows arranged along one direction in a cross section of the honeycomb structure body and including a first cell row constituted of at least one of an inflow cell and an outflow cell, and a through-cell, and a second cell row including no through-cells. A width P(mm) of the first cell row, a width P(mm) of the second cell and a curvature radius R of a curved shape of corner portions of a polygonal shape of each cell satisfy relations of Equations (1) and (2) below: Equation (1): 2&#x2264;100&#x2212;(P/P&#xd7;100)&#x2264;50, and Equation (2): 0.4&#x2264;(R/1000)/((P+P)/2)&#xd7;100&#x2264;20.

A honeycomb structure comprising: a honeycomb structure body that includes a plurality of porous partition walls and intersection parts, and a catalyst layer, wherein the porosity of the partition wall is 20 to 70%, the average pore diameter of the pores in the partition wall is 1 to 60 &#x3bc;m, a plurality of the partition walls includes a notched partition wall having a recessed part in which at least one end is notched, the ratio of the notched partition wall in the partition walls is 1 to 100%, the recessed part of the notched partition wall has a depth of 10 to 200% of the standard length, and the recessed part of the notched partition wall is a part having a width of 33 to 100% of the standard width.

The honeycomb structure body has a dense part at a part in axial direction including a center region of the inflow end face, the dense part having a change ratio of porosity calculated by the following Expression (1) that is 2 to 8%, and has an outside-diameter increasing part, and the honeycomb structure body has a change ratio of average diameter calculated by the following Expression (2) that is 0.2 to 3%,(1&#x2212;Px/Py)&#xd7;100, &#x2003;&#x2003;Expression (1):

The honeycomb structure body has a dense part having a change ratio of porosity calculated by the following Expression (1) that is 1 to 5%. The honeycomb structure body also has an outside-diameter decreasing part in which the outside diameter decreases from the inflow end face to the outflow end face. The honeycomb structure body has a change ratio of average diameter calculated by the following Expression (2) that is 0.2 to 3%.(1&#x2212;)&#xd7;100,&#x2003;&#x2003;Expression (1):

A honeycomb structure including prismatic columnar honeycomb segments and a bonding layer, wherein the bonding layer has rows in each of which bonding layer portions each disposed between two honeycomb segments arranged to face each other are arranged to extend from one point of a peripheral edge of a bonded body of the honeycomb segments to the other point thereof, in a cross section, the bonding layer of each of the-rows is disposed so that among the bonding layer portions arranged in one direction, an outermost circumference bonding layer portion and at least one of the other bonding layer portions are not superimposed on each other on an extension line of the one direction, and a ratio of shift of side surfaces of adjacent honeycomb segments to a length of one side of a side surface of honeycomb segments having the same cross-sectional shape is 10% or less.

A honeycomb structure has partition walls defining a plurality of hexagonal cells the partition walls are constituted by combining standard partition walls having a partition wall thickness in a range smaller than &#xb1;10% to an average partition wall thickness of the partition walls, wide partition walls having a partition wall thickness of +10% or more to the average partition wall thickness, and narrow partition walls having a partition wall thickness of &#x2212;10% or less to the average partition wall thickness, and a non-standard partition wall ratio is in a range of 10% to 30% which is a ratio occupied by a subtotal number of non-standard partition walls obtained by adding the wide partition walls and the narrow partition walls in a total number of the partition walls which is obtained by adding the numbers of the standard partition walls, the wide partition walls and the narrow partition walls.

A plugged honeycomb structure in which in a cross section of a honeycomb structure body which is perpendicular to an extending direction of cells, inflow cells are disposed to surround an outflow cell, and the number of the inflow cells is larger than the number of the outflow cells, and the cross section has a plurality of intersecting portions of partition walls each defining the inflow cells which are adjacent to each other, and in 60% or more of a total number of the intersecting portions, a relation between a diameter (D) of a circle inscribed in the intersecting portion and a diameter (D) of a circle inscribed in the partition wall defining the inflow cell and the outflow cell which are adjacent to each other satisfies D/(&#x221a;2&#xd7;D)=1.20 to 1.80

Plugged honeycomb structure

A honeycomb structure includes a honeycomb body having a partition wall defining a plurality of cells that extend from an inflow-end face as one end face to an outflow-end face as the other end face, the honeycomb body having a circumferential shape at a cross section orthogonal to an extending direction of the cells that is a rectangular shape with four corners being chamfered and having a long diameter and a short diameter, wherein the plurality of cells are hexagon cells having a hexagonal shape at the cross section orthogonal to the extending direction of the cells, and the hexagon cells are configured so that a longest diagonal line of each hexagon cell and the long diameter L of the honeycomb body form an angle that is 0 to 6&#xb0;.

A honeycomb structure includes a honeycomb body having a partition wall defining a plurality of cells that extend from an inflow-end face as one end face to an outflow-end face as the other end face, the honeycomb body having a circumferential shape at a cross section orthogonal to an extending direction of the cells that is a rectangular shape with four corners being chamfered and having a long diameter and a short diameter, wherein the plurality of cells are hexagon cells having a hexagonal shape at the cross section orthogonal to the extending direction of the cells, and the hexagon cells are configured so that a longest diagonal line of each hexagon cell and the short diameter S of the honeycomb body form an angle that is 0 to 6&#xb0;.

A honeycomb structure having a quadrangular or triangular cross-sectional shape of cells and having specific open cells in which open changing portions are present only in a range of 20 mm or less from the first end face, and the open changing portion satisfies relations of 1&#x2264;|(1&#x2212;(D/D))&#xd7;100|&#x2264;80 and 1&#x2264;|(1&#x2212;(D/D))&#xd7;100|&#x2264;80. Dindicates a diameter of an inscribed circle which comes in contact with a peripheral edge of the open end of the cell in the first end face. Dindicates a diameter of the inscribed circle which comes in contact with the peripheral edge of the open end of the cell in the second end face. Dindicates a diameter of an inscribed circle which comes in contact with a peripheral edge of the cell in a cross section perpendicular to a direction from the first end face toward the second end face.

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Nagoya, Japan

Takahiro Kondo