# US 2020/0400057 A1 · Honeycomb structure, electric heating type honeycomb structure, electric heating type catalyst and exhaust gas purifying device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2020/0400057 A1 - Document ID: US20200400057A1 - Status: Published application - Kind: A1 - Application number: 16/816,787 - Filed: 2020-03-12 - Published: 2020-12-24 - Earliest claimed: 2019-06-18 - Assignees: NGK Insulators, Ltd. - Applicants: Ngk Insulators, Ltd. - Inventors: Takayuki INOUE; Kohei YAMADA; Makoto HAMAZAKI - Web page: https://patentgrep.com/patent/US20200400057A1 ## CPC - F01N 3/2825: {Ceramics (F01N3/2832, F01N3/2835 take precedence)} - B01D 53/94: by catalytic processes - C04B 35/117: Composites - C04B 35/185: Mullite {3Al2O3-2SiO2} - C04B 35/195: Alkaline earth aluminosilicates, e.g. cordierite {or anorthite} - C04B 35/488: Composites - C04B 35/565: based on silicon carbide - C04B 35/581: based on aluminium nitride - C04B 35/584: based on silicon nitride - C04B 35/6263: {characterised by their solids loadings, i.e. the percentage of solids} - C04B 38/0009: {characterised by features relating to the cell walls, e.g. wall thickness or distribution of pores in the walls} - 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} - C04B 2111/00793: {as filters or diaphragms} - C04B 2235/386: Boron nitrides - C04B 2235/402: Aluminium - C04B 2235/42: Non metallic elements added as constituents or additives, e.g. sulfur, phosphor, selenium or tellurium - C04B 2235/421: Boron - C04B 2235/428: Silicon - C04B 2235/5436: micrometer sized, i.e. from 1 to 100 micron - C04B 2235/6567: Treatment time - C04B 2235/663: Oxidative annealing - C04B 2235/72: Products characterised by the absence or the low content of specific components, e.g. alkali metal free alumina ceramics - C04B 2235/80: Phases present in the sintered or melt-cast ceramic products other than the main phase - F01N 2330/00: Structure of catalyst support or particle filter - F01N 2330/06: Ceramic, e.g. monoliths - Y02A 50/20: Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters - 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) - 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) - C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE - Y02A: TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE ## Abstract A honeycomb structure includes: an outer peripheral wall; and partition walls disposed on an inner side of the outer peripheral wall, the partition walls defining a plurality of cells, each of the plurality of cells extending from one end face to the other end face to form a flow path for a fluid. The partition walls and the outer peripheral wall include ceramics containing at least silicon. A content of silicon in the ceramics is 30% by mass or more. A concentration of at least one dopant in the silicon is from 1016 to 5×1020/cm3. ## Claims ### Claim 1 A honeycomb structure, comprising: an outer peripheral wall; and partition walls disposed on an inner side of the outer peripheral wall, the partition walls defining a plurality of cells, each of the plurality of cells extending from one end face to the other end face to form a flow path for a fluid, wherein the partition walls and the outer peripheral wall comprise ceramics containing at least silicon; wherein a content of silicon in the ceramics is 30% by mass or more; wherein a concentration of at least one dopant in the silicon is from 1016 to 5×1020/cm3. ### Claim 2 (depends on 1) The honeycomb structure according to claim 1, wherein the at least one dopant is a Group 13 element or a Group 15 element. ### Claim 3 (depends on 2) The honeycomb structure according to claim 2, wherein the at least one dopant is one or two selected from the group consisting of B and Al. ### Claim 4 (depends on 2) The honeycomb structure according to claim 2, wherein the at least one dopant is one or two selected from the group consisting of N and P. ### Claim 5 (depends on 1) The honeycomb structure according to claim 1, wherein the ceramics forming the partition walls and the outer peripheral wall contains the silicon in an amount of 30% by mass or more and less than 100% by mass. ### Claim 6 (depends on 1) The honeycomb structure according to claim 1, wherein the honeycomb structure has a thickness of each of the partition walls of from 50 to 200 μm, and a cell density of from 50 to 150 cells/cm2. ### Claim 7 (depends on 1) The honeycomb structure according to claim 1, wherein the partition walls and the outer peripheral wall further contain at least one selected from the group consisting of alumina, mullite, zirconia, cordierite, silicon carbide, silicon nitride, and aluminum nitride. ### Claim 8 (depends on 1) An electric heating type honeycomb structure, comprising: the honeycomb structure according to claim 1; and a pair of electrode layers disposed so as to face each other across a central axis of the honeycomb structure, each of the electrode layers being disposed on a surface of the outer peripheral wall of the honeycomb structure. ### Claim 9 (depends on 8) An electric heating type support, comprising: the electric heating type honeycomb structure according to claim 8; and a pair of metal terminals disposed so as to face each other across a central axis of the electric heating type honeycomb structure, the pair of metal terminals being disposed on the pair of the electrode layers. ### Claim 10 (depends on 9) An exhaust gas purifying device, comprising: the electric heating type support according to claim 9; and a can body for holding the electric heating type support. ### Claim 11 A honeycomb structure, comprising: an outer peripheral wall; and partition walls disposed on an inner side of the outer peripheral wall, the partition walls defining a plurality of cells, each of the plurality of cells extending from one end face to the other end face to form a flow path for a fluid, wherein the partition walls and the outer peripheral wall comprise ceramics, wherein the ceramics contain: silicon; and at least one selected from the group consisting of alumina, mullite, zirconia, cordierite, silicon carbide, silicon nitride, and aluminum nitride; wherein a content of silicon in the ceramics is 30% by mass or more; wherein the silicon contains B as a dopant; and wherein the honeycomb structure has a volume resistivity of 0.01 Ω·cm or more and 5 Ω·cm or less.