Honeycomb structure and exhaust gas purifying device

Patent metadata

Field	Value
Publication number	US-12383852-B2
Application number	US-202217810874-A
Country	US
Kind code	B2
Filing date	Jul 6, 2022
Priority date	Feb 7, 2020
Publication date	Aug 12, 2025
Grant date	Aug 12, 2025

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

The invention claimed is:

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 an other end face of the honeycomb structure to form a flow path,
wherein the cells include a plurality of wire pieces comprising a magnetic substance, such that individual cells contain a plurality of wire pieces alternatingly arranged with a plurality of spaces or a plurality of buffer material segments in an extension direction that extends from the one end face of the honeycomb to the other end face of the honeycomb, and
wherein each wire piece within a cell is completely separated from the other wire pieces in the cell by one or more spaces or buffer material segments.

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 each cell of the plurality of cells is ⅕ or more of the total length of the wire pieces in the extending direction of each cell of the plurality of 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

• B01J35/57

  Honeycombs · CPC title

• F01N3/027 Primary

  using electric or magnetic heating means · CPC title

• F01N3/0222

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

• B01D46/2476

  Monolithic structures · CPC title

• B01D46/24495

  Young's modulus · CPC title