Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
  • B01D53/34—Chemical or biological purification of waste gases
  • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
  • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
  • B01D53/9445—Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC]
  • B01D53/945—Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC] characterised by a specific catalyst
• • C—CHEMISTRY; METALLURGY
  • C21—METALLURGY OF IRON
  • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
  • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
  • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C38/00—Ferrous alloys, e.g. steel alloys
  • C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C38/00—Ferrous alloys, e.g. steel alloys
  • C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C38/00—Ferrous alloys, e.g. steel alloys
  • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C38/00—Ferrous alloys, e.g. steel alloys
  • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C38/00—Ferrous alloys, e.g. steel alloys
  • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
  • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
  • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D2258/00—Sources of waste gases
  • B01D2258/01—Engine exhaust gases
  • B01D2258/012—Diesel engines and lean burn gasoline engines
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
  • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
  • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
  • Y02T10/00—Road transport of goods or passengers
  • Y02T10/10—Internal combustion engine [ICE] based vehicles
  • Y02T10/12—Improving ICE efficiencies

Definitions

• the invention relates to an iron-chromium-aluminium alloy having good oxidation resistance.
• U.S. Pat. No. 5,366,139 discloses a method whereby foils of iron-chromium-aluminium alloys are produced by way of suitable iron-chromium steel being coated on both sides with aluminium or aluminium alloys by way of roll cladding. This composite metal is processed exclusively by cold deformation and is subjected to diffusion annealing to produce a homogeneous structure.
• a further method whereby the coating is achieved by way of hot dip aluminizing is disclosed in DE-A 198 34 552.
• the latter foil has the following chemical composition (all details in % by weight): 18-25% Cr, 4-10% Al, 0.03-0.08% Y, max. 0.01% Ti, 0.01-0.05% Zr, 0.01-0.05% Hf, 0.5-1.5% Si, residual iron and method-associated impurities. Foils fabricated with this alloy were to date used in four-stroke-combustion engines.
• the solution to the task set is provided by an iron-chromium-aluminium alloy having good oxidation resistance, with (in % by weight) 2.5 to 5.0% Al and 10 to 25% Cr and 0.05-0.8% Si as well as additions of >0.01 to 0.1% Y and/or >0.01 to 0.1% Hf and/or >0.01 to 0.2% Zr and/or >0.01 to 0.2% Cerium mischmetal (Ce, La, Nd) (i.e., at least two of Ce, La, or Nd) as well as production-associated impurities.
• Cerium mischmetal Ce, La, Nd
• a preferred iron-chromium-aluminium alloy having good oxidation resistance has the following composition (in % by weight): 2.5-5% Al and 13 to 21% Cr as well as alternative additions of:
• One method for the fabrication of semi-finished articles from this alloy is characterised in that the semi-finished article following melting of the alloy by way of ingot casting or continuous casting as well as hot and cold deformation may be required to undergo one (or more) intermediate annealing processes.
• the production of a foil of 50 ⁇ m or even 20 ⁇ m thickness is possible in the conventional manner in such compositions.
• the slabs can even be produced by way of the particularly inexpensive continuous casting process which in the presence of higher aluminium contents is, as a rule, connected with high losses.
• Aluchrom ISE, Hf3 and Hf4 represent comparative alloys and Aluchrom Hf1 and Hf2 are the subject of the present invention.
• the examples in accordance with the invention were produced by melting in the electric arc furnace, continuous casting or ingot casting, hot rolling to a thickness of about 3 mm, with intermediate annealing at end thicknesses of 0.02 to 0.05 and cold rolling on a 20 roller scaffold.
• the exact tuning of the oxygen affine reactive elements is of predominant importance.
• the alloys according to the present invention Aluchrom Hf1 and Aluclirom Hf2 in spite of their comparatively low Al-content of around 3%, show an extremely good oxidation resistance, which is similar to the comparative alloys Aluclirom ISE and Aluchrom Hf4.
• Aluchrom Hf3 in spite of its high Al— content of 5.36%, has lower values which can be attributed to the Y content being too low. In this instance therefore additions of Y or Cerium mischmetal result in a markedly improved oxidation resistance. (compare Aluchrom ISE and Aluchrom Rf4).
• a further important aspect for the construction of metallic catalytic converter substrates for Diesel engines and two-stroke engines is the dimensional stability of the foil during the useful life of the foil.
• a respective characteristic feature in this regard is the linear deformation which should, if possible, not exceed 4%.

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Mechanical Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Analytical Chemistry (AREA)
• Health & Medical Sciences (AREA)
• Biomedical Technology (AREA)
• Environmental & Geological Engineering (AREA)
• Combustion & Propulsion (AREA)
• General Chemical & Material Sciences (AREA)
• Oil, Petroleum & Natural Gas (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Thermal Sciences (AREA)
• Physics & Mathematics (AREA)
• Crystallography & Structural Chemistry (AREA)
• Catalysts (AREA)
• Treatment Of Steel In Its Molten State (AREA)
• Fuel Cell (AREA)
• Soft Magnetic Materials (AREA)
• Filling Or Discharging Of Gas Storage Vessels (AREA)
• Heat Treatment Of Sheet Steel (AREA)

Applications Claiming Priority (3)

Publications (1)

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Cited By (8)

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Citations (3)

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• 2003
  • 2003-03-11 DE DE10310865A patent/DE10310865B3/de not_active Expired - Fee Related
• 2004
  • 2004-03-08 DE DE112004000857T patent/DE112004000857D2/de not_active Expired - Fee Related
  • 2004-03-08 EP EP04718262.1A patent/EP1601804B1/de not_active Expired - Lifetime
  • 2004-03-08 MX MXPA05009519A patent/MXPA05009519A/es unknown
  • 2004-03-08 BR BRPI0409579-0B1A patent/BRPI0409579B1/pt active IP Right Grant
  • 2004-03-08 RU RU2005131433/02A patent/RU2341581C2/ru active
  • 2004-03-08 JP JP2006504254A patent/JP2006519929A/ja active Pending
  • 2004-03-08 US US10/552,310 patent/US20070110609A1/en not_active Abandoned
  • 2004-03-08 AU AU2004219941A patent/AU2004219941B2/en not_active Expired
  • 2004-03-08 WO PCT/DE2004/000454 patent/WO2004081247A2/de active Application Filing
  • 2004-03-08 ES ES04718262.1T patent/ES2445584T3/es not_active Expired - Lifetime
  • 2004-03-08 KR KR1020057016835A patent/KR20050109545A/ko active Search and Examination
  • 2004-03-08 CA CA002529720A patent/CA2529720A1/en not_active Abandoned
  • 2004-08-03 UA UAA200509408A patent/UA81021C2/uk unknown
• 2005
  • 2005-08-29 ZA ZA200506916A patent/ZA200506916B/en unknown

Patent Citations (3)

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