US 7,348,049 B2Granted

Honeycomb structural body, manufacturing method of the honeycomb structural body, and exhaust gas purifying device

AssigneeIbiden Co., Ltd.

InventorYutaka Yoshida

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Abstract

A honeycomb structural body comprising: a pillar-shaped ceramic block and a sealing material provided on an outer peripheral portion of said ceramic block, each of them having irregularities formed on an outer peripheral face wherein: when a least square curve is determined by a least square method on the basis of points constituting the contour of a cross-section, a center-of-gravity is defined as c1, a distance between a minimum concentric circumscribed curve having c1 and the center-of-gravity c1 is defined as D1, a distance between a maximum concentric inscribed curve having c1 and the center-of-gravity c1 is defined as D2, and the following inequality is satisfied: about 0.3 mm≦(D1-D2); same definition is applied to said ceramic block, a center-of-gravity thereof is defined as c2, a distance between a minimum concentric circumscribed curve having c2 and the center-of-gravity c2 is defined as D3, a distance between a maximum concentric inscribed curve having c2 and the center-of-gravity c2 is defined as D4, and the following inequality is satisfied: about 0.5 mm≦(D3-D4)≦about 7.0 mm.

Claims53

Dependent claims

A honeycomb structural body comprising:

a pillar-shaped ceramic block made of porous ceramic which includes a number of through holes that are placed in parallel with one another in the length direction with a wall portion interposed therebetween;
and
a sealing material provided on an outer peripheral portion of said pillar-shaped ceramic block, each of said honeycomb structural body and said pillar-shaped ceramic block having irregularities formed on an outer peripheral face thereof
wherein:
when a least square curve is determined by a least square method on the basis of points constituting the contour of a cross-section perpendicular to the length direction of said honeycomb structural body, a center-of-gravity thereof is defined as c1, a distance between a minimum concentric circumscribed curve, having c1 as the center-of-gravity, of said least square curve and the center-of-gravity c1 is defined as D1, a distance between a maximum concentric inscribed curve, having c1 as the center-of-gravity, of said least square curve and the center-of-gravity c1 is defined as D2, and
(D1-D2) is defined as M1,
the following inequality is satisfied:
about 0.3 mm≦M1;
and
when a least square curve is determined by a least square method on the basis of points constituting the contour of a cross-section perpendicular to the length direction of said ceramic block, a center-of-gravity thereof is defined as c2, a distance between a minimum concentric circumscribed curve, having c2 as the center-of-gravity, of said least square curve and the center-of-gravity c2 is defined as D3, a distance between a maximum concentric inscribed curve, having c2 as the center-of-gravity, of said least square curve and the center-of-gravity c2 is defined as D4, and (D3-D4) is defined as M2, the following inequality is satisfied:
about 0.5 mm≦M2≦7.0 mm.

8 more elements

A manufacturing method of a honeycomb structural body comprising a pillar-shaped ceramic block made of porous ceramic which includes a number of through holes that are placed in parallel with one another in the length direction with a wall portion interposed therebetween;

and a sealing material provided on an outer peripheral portion of said pillar-shaped ceramic block, each of said honeycomb structural body and said pillar-shaped ceramic block having irregularities formed on an outer peripheral face thereof wherein:
when a least square curve is determined by a least square method on the basis of points constituting the contour of a cross-section perpendicular to the length direction of said honeycomb structural body, a center-of-gravity thereof is defined as c1, a distance between a minimum concentric circumscribed curve, having c1 as the center-of-gravity, of said least square curve and the center-of-gravity c1 is defined as D1, a distance between a maximum concentric inscribed curve, having c1 as the center-of-gravity, of said least square curve and the center-of-gravity c1 is defined as D2, and (D1-D2) is defined as M1, the following inequality is satisfied:
about 0.3 mm ≦M1;
and when a least square curve is determined by a least square method on the basis of points constituting the contour of a cross-section perpendicular to the length direction of said ceramic block, a center-of-gravity thereof is defined as c2, a distance between a minimum concentric circumscribed curve, having c2 as the center-of-gravity, of said least square curve and the center-of-gravity c2 is defined as D3, a distance between a maximum concentric inscribed curve, having c2 as the center-of-gravity, of said least square curve and the center-of-gravity c2 is defined as D4, and (D3-D4) is defined as M2, the following inequality is satisfied:
about 0.5 mm ≦M2 ≦7.0 mm, wherein the method comprises a step of:
processing an outer peripheral face of a ceramic dried body obtained by drying a ceramic molded body that contains a ceramic material constituting each of said porous ceramic members so as to form a plurality of kinds of ceramic dried bodies having different shapes.

3 more elements

and a sealing material provided on an outer peripheral portion of said pillar-shaped ceramic block, each of said honeycomb structural body and said pillar-shaped ceramic block having irregularities formed on an outer peripheral face thereof wherein:
when a least square curve is determined by a least square method on the basis of points constituting the contour of a cross-section perpendicular to the length direction of said honeycomb structural body, a center-of-gravity thereof is defined as c1, a distance between a minimum concentric circumscribed curve, having c1 as the center-of-gravity, of said least square curve and the center-of-gravity c1 is defined as D1, a distance between a maximum concentric inscribed curve, having c1 as the center-of-gravity, of said least square curve and the center-of-gravity c1 is defined as D2, and (D1-D2) is defined as M1, the following inequality is satisfied:
about 0.3 mm≦M1;
and when a least square curve is determined by a least square method on the basis of points constituting the contour of a cross-section perpendicular to the length direction of said ceramic block, a center-of-gravity thereof is defined as c2, a distance between a minimum concentric circumscribed curve, having c2 as the center-of-gravity, of said least square curve and the center-of-gravity c2 is defined as D3, a distance between a maximum concentric inscribed curve, having c2 as the center-of-gravity, of said least square curve and the center-of-gravity c2 is defined as D4, and (D3-D4) is defined as M2, the following inequality is satisfied:
about 0.5 mm≦M2≦7.0 mm, wherein the method comprises a step of:
performing extrusion molding to form ceramic molded bodies having a plurality of kinds of cross-sectional shapes.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 11/098,410Filed 5 Apr 2005
Priority: JP 2004-1114305 Apr 2004
Published: US 2005/0229565 A120 Oct 2005
Granted: 25 Mar 2008
Term ends: Not estimatedThe source records don’t support an estimate.

Classification27 codes

F01N 3/0222
Characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous: the structure being monolithic, e.g. honeycombs
B01D 46/0001
Filters or filtering processes specially modified for separating dispersed particles from gases or vapours: making filtering elements
B01D 46/2429
Characterized by parameters related to the physical properties of the honeycomb structure material: of the honeycomb walls or cells
B01D 46/24491
Characterized by parameters related to the physical properties of the honeycomb structure material: porosity