Honeycomb structure

Patent metadata

Field	Value
Publication number	US-9255514-B2
Application number	US-201414224670-A
Country	US
Kind code	B2
Filing date	Mar 25, 2014
Priority date	Mar 29, 2013
Publication date	Feb 9, 2016
Grant date	Feb 9, 2016

Abstract

A honeycomb structure includes a tubular bonded honeycomb segment assembly having a plurality of honeycomb segments and a bonding layer which bonds side surfaces of the plurality of honeycomb segments to each other; and a pair of electrode members disposed on a side surface of the bonded honeycomb segment assembly, a volume resistivity of each of the honeycomb segments is from 1 to 200 Ωcm, at least a part of the bonding layer is made of a bonding material having a conductivity, a volume resistivity of the bonding layer is from 2 to 2000 Ωcm, and each of the pair of electrode members is formed into a band-like shape extending in an extending direction of the cells of the bonded honeycomb segment assembly, and one electrode member is disposed on a side opposite to the other electrode member via a center of the bonded honeycomb segment assembly.

First claim

What is claimed is:

1. A honeycomb structure comprising:
a tubular bonded honeycomb segment assembly having a plurality of tubular honeycomb segments having porous partition walls to define and form a plurality of cells which become through channels for a fluid and extend from one end surface to the other end surface, and also having a bonding layer which bonds side surfaces of the plurality of tubular honeycomb segments to each other; and a pair of electrode members disposed on a side surface of the tubular bonded honeycomb segment assembly,
wherein a volume resistivity of each of the tubular honeycomb segments of the tubular bonded honeycomb segment assembly is from 1 to 200 Ωcm, at least a part of the bonding layer is made of a bonding material having conductivity,
a volume resistivity of the bonding layer having conductivity is from 2 to 2000 Ωcm, and
each of the pair of electrode members is formed into a band-like shape extending in an extending direction of the plurality of cells of the tubular bonded honeycomb segment assembly, and in a cross section perpendicular to the cell extending direction, one electrode member in the pair of electrode members is disposed on a side opposite to the other electrode member in the pair of electrode members via a center of the tubular bonded honeycomb segment assembly.

2. The honeycomb structure according to claim 1 ,
wherein when the volume resistivity of the bonding layer having the conductivity is ρjo, an open frontal area ratio of the tubular honeycomb segment is OFA, the volume resistivity of the tubular honeycomb segment is ρA and a numeric value calculated in accordance with a formula of ρA/(1−OFA/100) is Rjo, a value of ρjo/Rjo as a value of a ratio of the ρjo to the Rjo is from 0.2 to 3.0.

3. The honeycomb structure according to claim 1 , wherein a porosity of the bonding layer is from 30 to 70%.

4. The honeycomb structure according to claim 2 , wherein a porosity of the bonding layer is from 30 to 70%.

5. The honeycomb structure according to claim 1 ,
wherein in the cross section perpendicular to the cell extending direction, the bonding layer has a both-end contact linear portion as a linear portion in which one end portion comes in contact with the one electrode member and the other end portion comes in contact with the other electrode member, and
a resistance value between the one end portion and the other end portion in the both-end contact linear portion is larger than a resistance value of the tubular honeycomb segment.

6. The honeycomb structure according to claim 2 ,
wherein in the cross section perpendicular to the cell extending direction, the bonding layer has a both-end contact linear portion as a linear portion in which one end portion comes in contact with the one electrode member and the other end portion comes in contact with the other electrode member, and
a resistance value between the one end portion and the other end portion in the both-end contact linear portion is larger than a resistance value of the tubular honeycomb segment.

7. The honeycomb structure according to claim 3 ,
wherein in the cross section perpendicular to the cell extending direction, the bonding layer has a both-end contact linear portion as a linear portion in which one end portion comes in contact with the one electrode member and the other end portion comes in contact with the other electrode member, and
a resistance value between the one end portion and the other end portion in the both-end contact linear portion is larger than a resistance value of the tubular honeycomb segment.

8. The honeycomb structure according to claim 4 ,
wherein in the cross section perpendicular to the cell extending direction, the bonding layer has a both-end contact linear portion as a linear portion in which one end portion comes in contact with the one electrode member and the other end portion comes in contact with the other electrode member, and
a resistance value between the one end portion and the other end portion in the both-end contact linear portion is larger than a resistance value of the tubular honeycomb segment.

9. The honeycomb structure according to claim 1 ,
wherein in the cross section perpendicular to the cell extending direction, the bonding layer has a one-end contact linear portion as a linear portion in which both end portions are positioned in an outer periphery of the tubular bonded honeycomb segment assembly and only one end portion comes in contact with the electrode member, and
a resistance value between the one end portion and the other end portion in the one-end contact linear portion is larger than a resistance value of the tubular honeycomb segment.

10. The honeycomb structure according to claim 1 ,
wherein in the cross section perpendicular to the cell extending direction, the bonding layer has a non-contact vertical linear portion as a linear portion in which both end portions are positioned in an outer periphery of the tubular bonded honeycomb segment assembly and do not come in contact with the electrode members and which does not intersect with a line segment connecting centers of the pair of electrode members to each other, and
a resistance value between the one end portion and the other end portion in the non-contact vertical linear portion is larger than a resistance value of the tubular honeycomb segment.

11. The honeycomb structure according to claim 1 ,
wherein in the cross section perpendicular to the cell extending direction, the bonding layer has a non-contact transverse linear portion as a linear portion in which both end portions are positioned in an outer periphery of the tubular bonded honeycomb segment assembly and do not come in contact with the electrode members and which intersects with a line segment connecting centers of the pair of electrode members to each other, and
a resistance value between the one end portion and the other end portion in the non-contact transverse linear portion is smaller than a resistance value of the tubular honeycomb segment.

12. The honeycomb structure according to claim 1 ,
wherein a material of the tubular honeycomb segment contains a silicon-silicon carbide composite material as a main component, an average particle diameter of silicon carbide in the tubular honeycomb segment is from 3 to 50 μm, a porosity of the porous partition walls of the tubular honeycomb segment is from 35 to 60%, and a content ratio of silicon in the tubular honeycomb segment is from 10 to 40 mass % of a total mass of silicon and silicon carbide in the tubular honeycomb segment.

Assignees

• Ngk Insulators Ltd

Inventors

• Omiya Yoshimasa
• Kaneda Atsushi
• Mase Kazumi

Classifications

• F01N2330/06

  Ceramic, e.g. monoliths · CPC title

• F01N3/2026

  directly electrifying the catalyst substrate, i.e. heating the electrically conductive catalyst substrate by joule effect · CPC title

• B01D46/2425

  characterized by parameters related to the physical properties of the honeycomb structure material · CPC title

• C04B37/005

  consisting of glass or ceramic material · CPC title

• F01N3/2828

  Ceramic multi-channel monoliths, e.g. honeycombs · CPC title