Honeycomb structure and exhaust gas purifying device

Patent metadata

Field	Value
Publication number	US-2022362704-A1
Application number	US-202217810874-A
Country	US
Kind code	A1
Filing date	Jul 6, 2022
Priority date	Feb 7, 2020
Publication date	Nov 17, 2022
Grant date	—

Abstract

A pillar shaped honeycomb structure includes: an outer peripheral wall; and porous partition walls disposed on an inner side of the outer peripheral wall, the partition walls defining a plurality of cells, each of the cells extending from one end face to other end face to form a flow path, wherein the cells include a plurality of wire pieces made of a magnetic substance, the wire pieces being provided apart from each other via spaces or buffer materials in an extending direction of the cells.

First claim

1 . A pillar shaped honeycomb structure, comprising:
an outer peripheral wall; and porous partition walls disposed on an inner side of the outer peripheral wall, the partition walls defining a plurality of cells, each of the cells extending from one end face to other end face to form a flow path, wherein the cells include a plurality of wire pieces comprising a magnetic substance, the wire pieces being provided apart from each other via spaces or buffer materials in an extending direction of the cells.

2 . The honeycomb structure according to claim 1 , wherein each of the wire pieces has a length of 1 to 20 mm in the extending direction of the cells.

3 . The honeycomb structure according to claim 1 , wherein each of the spaces or the buffer materials has a length of 1 mm or more in the extending direction of the cells.

4 . The honeycomb structure according to claim 1 , wherein the total length of the spaces or the buffer materials in the extending direction of the cells is ⅕ or more of the total length of the wire pieces in the extending direction of the cells.

5 . The honeycomb structure according to claim 1 , wherein the buffer materials have a Young's modulus of 50 to 500 MPa.

6 . The honeycomb structure according to claim 1 , wherein the buffer materials have a porosity of 40 to 70%.

7 . The honeycomb structure according to claim 1 , wherein the buffer materials comprise cordierite, silica, or a ceramic material.

8 . The honeycomb structure according to claim 1 , wherein the wire pieces have a Curie temperature of 600° C. or more.

9 . The honeycomb structure according to claim 1 , wherein the wire pieces have a thermal expansion coefficient of 8×10 −6 /° C. to 12×10 −6 /° C.

10 . The honeycomb structure according to claim 1 , wherein the wire pieces comprise a FeCo alloy containing 10% by mass or more of Co or stainless steel.

11 . The honeycomb structure according to claim 1 , wherein the partition walls and the outer peripheral wall comprise a ceramic material.

12 . The honeycomb structure according to claim 11 , wherein the ceramic material is at least one selected from cordierite, silicon carbide, aluminum titanate, silicon nitride, mullite, and alumina.

13 . The honeycomb structure according to claim 1 , wherein the cells comprise:
a plurality of cells A which are opened on the one end face side and have plugged portions on the other end face; and a plurality of cells B which are arranged alternately with the cells A, and which are opened on the other end face side and have plugged portions on the one end face.

14 . An exhaust gas purifying device, comprising:
the honeycomb structure according to claim 1 ; a coil wiring that spirally surrounds an outer circumference of the honeycomb structure; and a metal pipe for housing the honeycomb structure and the coil wiring.

Assignees

• Ngk Insulators Ltd

Inventors

• Hosoda Kazuya
• Kimata Takafumi
• Izumi Yunie

Classifications

• B01D46/2429 Primary

  of the honeycomb walls or cells · CPC title

• F01N3/2882

  Catalytic reactors combined or associated with other devices, e.g. exhaust silencers or other exhaust purification devices (combined with absorbents or adsorbents only F01N3/0814; combined with particulate filters F01N3/035) · CPC title

• B01D46/24491

  Porosity · CPC title

• F01N3/28

  Construction of catalytic reactors · CPC title

• F01N3/0222

  the structure being monolithic, e.g. honeycombs · CPC title