# US 2019/0314802 A1 · Honeycomb structure

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- Number: US 2019/0314802 A1
- Document ID: US20190314802A1
- Status: Published application
- Kind: A1
- Application number: 16/378,968
- Filed: 2019-04-09
- Published: 2019-10-17
- Earliest claimed: 2018-04-13
- Assignees: NGK Insulators, Ltd.
- Applicants: Ngk Insulators, Ltd.
- Inventors: Takefumi KIMATA; Takahiro TOMITA
- Web page: https://patentgrep.com/patent/US20190314802A1

## CPC

- B01D 53/885: {Devices in general for catalytic purification of waste gases}
- B01D 53/94: by catalytic processes
- B01J 21/06: Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof
- B01J 27/224: Silicon carbide
- B01J 35/57: Honeycombs
- F01N 3/2013: {using electric or magnetic heating means}
- F01N 3/2026: {directly electrifying the catalyst substrate, i.e. heating the electrically conductive catalyst substrate by joule effect}
- F01N 3/28: Construction of catalytic reactors
- F01N 3/2828: {Ceramic multi-channel monoliths, e.g. honeycombs}
- H05B 3/03: Electrodes
- H05B 3/46: heating conductor mounted on insulating base
- F01N 2330/00: Structure of catalyst support or particle filter
- F01N 2330/06: Ceramic, e.g. monoliths
- H05B 2203/016: Heaters using particular connecting means
- H05B 2203/024: Heaters using beehive flow through structures
- Y02T 10/12: Improving ICE efficiencies
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- F01N: GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES (arrangements in connection with gas exhaust of propulsion units in vehicles B60K13/00; combustion-air intake silencers specially adapted for, or arranged on, internal-combustion engines F02M35/00; protecting against, or damping, noise in general G10K11/16)
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A honeycomb structure including: a pillar-shaped honeycomb structure portion having an outer peripheral wall and partition walls disposed on an inner side of the outer peripheral wall and defining a plurality of cells extending from one end face to another end face to form flow paths; and at least an electrode portion disposed on an outer surface of the outer peripheral wall of the pillar-shaped honeycomb structure portion, wherein the pillar-shaped honeycomb structure portion is formed of ceramics containing either or both of Si and SiC, the electrode portion contains either or both of a metal and a metal compound in addition to an oxide, and a volume ratio of the oxide on an inner peripheral side of the electrode portion is higher than a volume ratio of the oxide on an outer peripheral side of the electrode portion.

## Claims

### Claim 1

A honeycomb structure comprising:
a pillar-shaped honeycomb structure portion having an outer peripheral wall and partition walls disposed on an inner side of the outer peripheral wall and defining a plurality of cells extending from one end face to another end face to form flow paths; and at least an electrode portion disposed on an outer surface of the outer peripheral wall of the pillar-shaped honeycomb structure portion, wherein
the pillar-shaped honeycomb structure portion is formed of ceramics containing either or both of Si and SiC,
the electrode portion contains either or both of a metal and a metal compound in addition to an oxide, and
a volume ratio of the oxide on an inner peripheral side of the electrode portion is higher than a volume ratio of the oxide on an outer peripheral side of the electrode portion.

### Claim 2 (depends on 1)

The honeycomb structure according to claim 1, wherein a difference between the volume ratio of the oxide on the inner peripheral side of the electrode portion and the volume ratio of the oxide on the outer peripheral side of the electrode portion is 5% or more.

### Claim 3 (depends on 1)

The honeycomb structure according to claim 1, wherein the volume ratio of the oxide on the inner peripheral side of the electrode portion is 65% or more.

### Claim 4 (depends on 1)

The honeycomb structure according to claim 1, wherein the volume ratio of the oxide on the outer peripheral side of the electrode portion is 80% or less.

### Claim 5 (depends on 1)

The honeycomb structure according to claim 1, wherein an average thickness of the electrode portion is from 25 to 300 μm.

### Claim 6 (depends on 1)

The honeycomb structure according to claim 1, wherein the electrode portion contains an oxide of one or more elements selected from a group consisting of B, Mg, Al, Si, P, Ti and Zr.

### Claim 7 (depends on 6)

The honeycomb structure according to claim 6, wherein the electrode portion contains an oxide of one or more elements selected from a group consisting of Mg, Al and Si.

### Claim 8 (depends on 1)

The honeycomb structure according to claim 1, wherein at least a part of the oxide in the electrode portion is crystalline.

### Claim 9 (depends on 1)

The honeycomb structure according to claim 1, wherein either or both of the metal and the metal compound contained in the electrode portion include one or more selected from a group consisting of stainless steel, nickel-chromium alloy, TaC, TiN and ZrB2.

### Claim 10 (depends on 1)

The honeycomb structure according to claim 1, wherein either or both of the metal and the metal compound contained in the electrode portion include flat particles of a metal and/or a metal compound having an aspect ratio of from 2 to 100.

### Claim 11 (depends on 1)

The honeycomb structure according to claim 1, wherein an energization resistance is 40Ω or less.

### Claim 12 (depends on 1)

The honeycomb structure according to claim 1, wherein a volume ratio of an oxide in the pillar-shaped honeycomb structure portion is lower than the volume ratio of the oxide on the inner peripheral side of the electrode portion.

### Claim 13 (depends on 1)

The honeycomb structure according to claim 1, wherein a volume ratio of an oxide in the pillar-shaped honeycomb structure portion is 35% or less.

### Claim 14 (depends on 1)

The honeycomb structure according to claim 1, wherein a volume ratio of metal silicon in the pillar-shaped honeycomb structure portion is 20% or more.