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WO2004059025A1 - Iron alloy, especially for use in an exhaust gas cleaning unit - Google Patents

Iron alloy, especially for use in an exhaust gas cleaning unit Download PDF

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Publication number
WO2004059025A1
WO2004059025A1 PCT/EP2003/014355 EP0314355W WO2004059025A1 WO 2004059025 A1 WO2004059025 A1 WO 2004059025A1 EP 0314355 W EP0314355 W EP 0314355W WO 2004059025 A1 WO2004059025 A1 WO 2004059025A1
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WIPO (PCT)
Prior art keywords
weight
maximum
exhaust gas
iron alloy
alloy according
Prior art date
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PCT/EP2003/014355
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German (de)
French (fr)
Inventor
Michaela Fischer
Gerd Cloppenburg
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MK METALLFOLIEN GmbH
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MK METALLFOLIEN GmbH
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Application filed by MK METALLFOLIEN GmbH filed Critical MK METALLFOLIEN GmbH
Priority to AU2003298189A priority Critical patent/AU2003298189A1/en
Priority to EP03795900A priority patent/EP1573079B1/en
Priority to DE50304398T priority patent/DE50304398D1/en
Priority to SI200330470T priority patent/SI1573079T1/en
Publication of WO2004059025A1 publication Critical patent/WO2004059025A1/en
Anticipated expiration legal-status Critical
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Classifications

    • 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
    • C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
    • 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
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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
    • C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
    • 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
    • C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
    • 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
    • C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
    • 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
    • C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur

Definitions

  • Iron alloy in particular for use in an exhaust gas cleaning unit
  • the invention relates to an iron alloy, in particular for use in carrier foils in an exhaust gas cleaning unit, a metal foil and an exhaust gas cleaning unit, in particular an exhaust gas catalytic converter, particle filter and mixer, preferably for use in motor vehicles to reduce pollutant emissions.
  • Known catalyst supports of exhaust gas catalytic converter systems of automobiles usually have a ceramic Nerbund body.
  • An advantageous alternative to ceramic elements is the use of a metal foil as a metallic catalyst carrier in exhaust gas catalytic converter systems of internal combustion engines. Because of their quick start, these enable a significantly more efficient pollutant reduction than a ceramic-based catalyst carrier. Furthermore, due to the advantageous physical and technical properties, there are favorable effects on engine performance and pollutant emissions in internal combustion engines.
  • the metallic supports and support materials for catalysts known from the passenger car sector can in principle also be used for truck catalysts, but with a material requirement of approx. 500 g of the support material per liter engine volume of the truck engine for a truck catalyst there is an increased Material requirements for carrier material for a single truck catalytic converter. Because of the high material costs of the known carrier material, it is therefore not economical to manufacture a truck catalyst on a metallic basis.
  • the invention is based on the object of adapting the metal foil carrier concept of the exhaust gas catalytic converters known and proven from car internal combustion engines in a suitable manner to the needs of truck engines, and a metal foil, in particular for use in an exhaust gas cleaning unit and an exhaust gas cleaning unit, in particular
  • BEST ⁇ TIGU ⁇ SKOPIE to provide them for use in motor vehicles to reduce pollutant emissions.
  • this object is achieved by a carrier foil made of an iron alloy with 15-22% by weight of chromium, a maximum of 0.1% by weight of carbon, 0.05-1.0% by weight of manganese, 0.1-0.5 % Silicon, 2.5-7% by weight aluminum, 0.01-0.1% by weight zircon, maximum 0.1% by weight titanium, 0.001-0.01% by weight calcium, 0.01-0.1% by weight of vanadium, 0.001-0.02% by weight of tin and rare earth metals in an amount of 0.02-0.1% by weight and a remainder of iron with the usual accompanying elements to an amount of 100 wt .-%, by a metal foil made of the alloy according to the invention and by an exhaust gas purification unit with a metal foil made of the alloy according to the invention as a carrier film.
  • Advantageous developments of the aforementioned alloy and the metal foil are described in the subclaims.
  • Exhaust gas cleaning units in the sense of the registration are basically all components that can be used for cleaning exhaust gases.
  • Exhaust gas cleaning units are, in particular, exhaust gas catalytic converters, particle filters and mixers, which are used in an exhaust gas system placed behind an engine to reduce pollutant emissions.
  • the core of the invention is the consideration of maintaining the previous conception of exhaust gas cleaning units by using a new material for the metal foil.
  • the alloy according to the invention is characterized in particular by the fact that it can be used for the cost-effective production of a carrier film. Since the carrier foils produced from the alloy according to the invention also meet all the requirements for use on commercial vehicles, their use enables the inexpensive production of exhaust-gas catalysts which are structurally unchanged compared to exhaust-gas catalysts for cars and which are also suitable for use on truck engines. Basic, i.e. Complicated and cost-intensive changes to the design of the exhaust gas cleaning units to adapt to the needs of truck engines can be avoided.
  • the alloy according to the invention has a high resistance to oxidation of more than 100 ° C. This is achieved by alloying the oxygen-affine elements aluminum and chrome, which are dense, slow-growing under atmospheric oxygen, the Effectively form the underlying material against corrosion attack protective oxide layers.
  • Aluminum oxide layers generally offer a number of advantages over chromium oxide layers. They grow more slowly because of the denser packing of the aluminum oxide, unlike chromium oxide, they do not evaporate even at temperatures around 100 ° C and their protective effect is retained even under low-oxygen conditions under which chromium oxides can no longer form. The addition of chromium has the effect of promoting the formation of aluminum oxide in technical alloys.
  • An essential feature of the invention is the alloy of chrome and aluminum with the additions of calcium and rare earth metals.
  • the elements zirconium and titanium as well as the rare earth metals improve the behavior under the influence of cyclically changing and long-lasting temperature loads and improve the bond between the oxide layer and the basic matrix. Together with chrome and aluminum, these elements also promote the resistance of the protective layers formed during the oxidation.
  • a high oxygen affinity is characteristic for all elements mentioned here in low concentrations. This results in a delayed scaling of chrome and aluminum and the adhesion of the oxide layers formed is also improved.
  • the use of niobium serves to increase strength by acting as a carbide and nitride former.
  • the addition of several oxygen-related elements in combination as well as rare earth metals results in a heat-resistant steel alloy for higher application temperatures.
  • the alloy forms a firmly adhering aluminum oxide layer at elevated temperatures even under changing loads.
  • the alloying elements also increase the ductility and the dimensional stability of the metal foils produced from the alloy, even in a temperature range above 100 ° C.
  • Chromium and aluminum serve to increase the oxidation resistance. High levels are a prerequisite for a long service life, especially with cyclical temperature loads.
  • the zircon also ensures that the chromium content is retained in metallic form even in the event of thermal loads in the microstructure. Titan has essentially the same effect, but they are Effects on the resistance behavior, the scaling resistance as well as the mechanical properties at elevated temperatures lower than with zircon as an additional alloying element.
  • the addition of calcium has a positive effect on the resistance to oxidation at higher temperatures.
  • the alloy has sufficient thermal shock resistance. There is also sufficient creep resistance to prevent undesirable deformation. It can be economically, i.e. with high output and the least possible use of energy with conventional processes using large-scale melting metallurgy.
  • the alloy has sufficient ductility to enable low-cost cold forming into thin metal foils and the winding and further shaping of these metal foils into carrier material.
  • the alloy is also suitable for creating a texture on the metal foil during cold deformation of the alloy into thin metal foils.
  • the texture of the metal foils can be selected by adjusting the production parameters so that it corresponds to a desired body-centered metallic polycrystalline texture development. This increases the deformability of the metal foils and facilitates their further processing.
  • a metal foil made of an alloy according to the invention as a carrier foil enables the low-cost production of an exhaust gas cleaning unit due to the low costs for the production of the alloy and due to the low costs for further processing into a carrier foil, so that even large-volume exhaust gas catalysts for truck engines can be produced economically.
  • the use of a metal foil made of the alloy according to the invention as a carrier foil prevents the occurrence of a so-called "breakaway corrosion" even after longer running times of the exhaust gas cleaning unit, i.e. the protective oxide layers flaking off due to the exponential increase in the thickness of the corrosion layer over time as a result of depletion
  • a significant delay in the "breakaway corosion" is prevented by the provision of the element forming the cover layer in an adequate cover layer which has been destroyed enabling amount reached.
  • the exhaust gas purification unit according to the invention is further characterized by its long service life, which results from the longevity of the metal foil produced from the alloy according to the invention.
  • the coordination and composition of the alloy contents is chosen so that, despite a small foil thickness and the resulting limited aluminum reservoir for healing the destroyed layers, a safe cold and hot shaping of the material is possible.
  • Such exhaust gas purification units are suitable for installation in all types of motor vehicles and enable a significant reduction in pollutant emissions there.
  • the exhaust gas purification unit according to the invention is suitable for installation both in front of and behind an exhaust gas turbocharger which may be present.
  • the exhaust gas cleaning unit meets the increased requirements for vibration resistance.
  • the high thermal shock and thermal shock resistance of the metal foils produced from the alloy according to the invention is sufficient to withstand the strong temperature changes on the exhaust gas catalytic converter which occur when the engine is started and switched off.
  • the creep resistance of the alloy prevents inadmissible deformation of the exhaust gas catalytic converter, as a result of which the oxide layers are torn open and the occurrence of "breakaway corrosion" could be promoted.
  • the exhaust gas cleaning unit according to the invention has a higher number of cells due to the use of a metal foil according to the invention, so that pollutants can be temporarily stored in larger amounts until the necessary operating temperature of the exhaust gas cleaning unit is reached.
  • the metal foil has a thickness of at least 15 ⁇ m.
  • Exhaust gas cleaning units which were manufactured using such thin metal foils, have an increased vibration resistance in contrast to corresponding exhaust gas cleaning units based on ceramics.
  • the number of cells in the exhaust gas cleaning unit can be further increased, and thus the intermediate storage volume for pollutants can be further increased.
  • emission control devices designed in this way reach unit faster the necessary operating temperature so that the pollutant emissions can be reduced further.
  • Worn exhaust gas purification units of the type according to the invention can be added almost completely to reuse.
  • a ceramic coating which is applied to the metal foils formed into honeycombs, can be separated from the metal foils effectively and in an environmentally friendly manner.
  • the valuable precious metals accumulate in high concentration in the then separated coating.
  • the high-alloy metal foils can also be recycled.
  • FIG. 1 shows the schematic structure of an exhaust gas unit 1, which is integrated into an exhaust gas system (not shown) during operation on a motor vehicle.
  • the exhaust gas unit is formed by a plurality of metal foils 3, which are arranged intertwined in a cylindrical housing 2.
  • the alloy consisting of 17.5% by weight of chromium, 0.03% by weight of carbon, 0.1% by weight of manganese, 0.2% by weight of silicon, 3.9% by weight of aluminum , 0.03% by weight of zirconium, 0.03% by weight of titanium, 0.001% by weight of phosphorus, 0.001% by weight of sulfur, 0.004% by weight of calcium, 0.008% by weight of niobium, 0.04% by weight % Vanadium, 0.005% by weight tin, 0.1% by weight nickel, 0.005% by weight magnesium, 0.005% by weight nitrogen, 0.04% by weight copper, 0.005% by weight lead , 0.03 wt .-% molybdenum, rare earth metals in an amount of 0.05 wt .-% and iron with the usual accompanying elements, these were cast as a strand.
  • the alloy was then processed by cold rolling into the metal foils 3, which are used in the exhaust gas unit 1 and have a thickness of at least 15 ⁇ m.
  • the metal foils 3 extend in the exhaust gas catalytic converter 1 in an involute manner from the housing wall in the direction of the central axis of the cylindrical housing 2, each with an alternating direction of curvature around three reversal lines 4a, 4b, 4c arranged around the central axis of the housing 2. On the inner wall of the housing 2, the metal foils 3 are connected to the housing 2 by brazing.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Catalysts (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

The invention relates to an iron alloy, especially for use with carrier-films in an exhaust gas cleaning unit, a metal film and an exhaust gas cleaning unit, especially an exhaust gas catalyst, particle filter and mixing device, preferably for use in motor vehicles in order to reduce the emission of pollutants. In order to enable known and tried metal film carrier concept of passenger car exhaust gas catalysts to be adapted in a suitable manner to the engine requirements of heavy goods vehicles, the iron alloy comprises 15-22 wt. % chrome, maximum 0.1 wt. % carbon, 0.05-1.0 wt. % manganese, 0.1-0.5 wt. % silicon, 2.5-7 wt. % aluminium, 0.01-0.1 wt. % zircon, maximum 0.1 wt. % titanium, 0.001-0.01 wt. % calcium, 0.01-0.1 wt. % vanadium, 0.001-0.02 wt. % tin and rare 0.02-0.1 wt % earth metals and an iron radical with normal auxiliary elements amounting to 100 wt. %.

Description

Eisenlegierung, insbesondere zur Verwendung in einer Abgasreinigungseinheit Iron alloy, in particular for use in an exhaust gas cleaning unit

Die Erfindung betrifft eine Eisenlegierung, insbesondere zur Verwendung für Trägerfolien in einer Abgasreinigungseinheit, eine Metallfolie sowie eine Abgasreinigungseinheit, insbesondere einen Abgaskatalysator, Partikelfilter und Mischer, vorzugsweise zum Einsatz in Kraftfahrzeugen zur Reduzierung der Schadstoffemission.The invention relates to an iron alloy, in particular for use in carrier foils in an exhaust gas cleaning unit, a metal foil and an exhaust gas cleaning unit, in particular an exhaust gas catalytic converter, particle filter and mixer, preferably for use in motor vehicles to reduce pollutant emissions.

Bekannte Katalysatorträger von Abgaskatalysatorsystemen von Automobilen weisen üblicherweise einen keramischen Nerbundkörper auf. Eine vorteilhafte Alternative zu keramischen Elementen bildet die Verwendung einer Metallfolie als metallischer Katalysatorträger in Abgaskatalysatorsystemen von Verbrennungsmotoren. Diese ermöglichen wegen ihres schnellen Anspringens eine deutlich effizientere Schadstoffreduzierung als Katalysatorträger auf Keramikbasis. Ferner bestehen aufgrund der vorteilhaften physika- lisch-technischen Eigenschaften günstige Auswirkungen auf die Motorleistung und die Schadstoffemission bei Verbrennungsmotoren.Known catalyst supports of exhaust gas catalytic converter systems of automobiles usually have a ceramic Nerbund body. An advantageous alternative to ceramic elements is the use of a metal foil as a metallic catalyst carrier in exhaust gas catalytic converter systems of internal combustion engines. Because of their quick start, these enable a significantly more efficient pollutant reduction than a ceramic-based catalyst carrier. Furthermore, due to the advantageous physical and technical properties, there are favorable effects on engine performance and pollutant emissions in internal combustion engines.

Die aus dem PKW-Bereich bekannten metallischen Träger und Trägermaterialien für Katalysatoren können zwar grundsätzlich auch für LKW-Katalysatoren verwendet werden, bei einem Materialbedarf von ca. 500g des Trägermaterials pro Liter Motorvolumen des LKW-Motors für einen LKW-Katalysator ergibt sich jedoch ein erhöhter Materialbedarf an Trägermaterial für einen einzelnen LKW-Katalysator. Aufgrund der hohen Materialkosten des bekannten Trägermaterials ist deshalb eine Herstellung eines LKW-Katalysators auf metallischer Basis nicht wirtschaftlich.The metallic supports and support materials for catalysts known from the passenger car sector can in principle also be used for truck catalysts, but with a material requirement of approx. 500 g of the support material per liter engine volume of the truck engine for a truck catalyst there is an increased Material requirements for carrier material for a single truck catalytic converter. Because of the high material costs of the known carrier material, it is therefore not economical to manufacture a truck catalyst on a metallic basis.

Gesteigerte Anforderungen resultieren auch aus dem Einsatzbereich des Katalysators. So muß dieser zur Anordnung vor oder hinter einem Turbolader geeignet sein. Erhöhte Anforderungen bestehen auch an die Thermoschock- und Temperaturwechselfestigkeit sowie an die Vibrations- und Oxidationsbeständigkeit.Increased requirements also result from the area of application of the catalytic converter. So this must be suitable for arrangement in front of or behind a turbocharger. There are also increased requirements for thermal shock and thermal shock resistance as well as vibration and oxidation resistance.

Der Erfindung liegt die Aufgabe zu Grund, das von PKW Verbrennungsmotoren bekannte und bewährte Metallfolientragerkonzept der Abgaskatalysatoren in geeigneter Weise an die Bedürfnisse von LKW Motoren anzupassen, sowie eine Metallfolie, insbesondere zur Verwendung in einer Abgasreinigungseinheit und eine Abgasreinigungseinheit, insbeson-The invention is based on the object of adapting the metal foil carrier concept of the exhaust gas catalytic converters known and proven from car internal combustion engines in a suitable manner to the needs of truck engines, and a metal foil, in particular for use in an exhaust gas cleaning unit and an exhaust gas cleaning unit, in particular

BESTÄTIGUΝΘSKOPIE dere zum Einsatz in Kraftfahrzeugen zur Verringerung der Schadstoffemission bereitzustellen.BESTÄTIGUΝΘSKOPIE to provide them for use in motor vehicles to reduce pollutant emissions.

Erfindungsgemäß wird diese Aufgabe durch eine Trägerfolie aus einer Eisenlegierung mit 15-22 Gew.-% Chrom, maximal 0,1 Gew.-% Kohlenstoff, 0,05-1,0 Gew.-% Mangan, 0,1-0,5 Gew.- Silizium, 2,5-7 Gew.-% Aluminium, 0,01-0,1 Gew.-% Zirkon, maximal 0,1 Gew.-% Titan, 0,001-0,01 Gew.-% Kalzium, 0,01-0,1 Gew.-% Vanadium, 0,001-0,02 Gew.-% Zinn und Seltene Erdmetalle in einer Menge von 0,02-0,1 Gew.-% sowie einen Rest Eisen mit den üblichen Begleitelementen bis auf eine Menge von 100 Gew.-%, durch eine Metallfolie aus der erfindungsgemäßen Legierung sowie durch eine Abgasreinigungseinheit mit einer Metallfolie aus der erfindungsgemäßen Legierung als Trägerfolie gelöst. Vorteilhafte Weiterbildungen der vorgenannten Legierung und der Metallfolie sind in den Unteransprüchen beschrieben.According to the invention, this object is achieved by a carrier foil made of an iron alloy with 15-22% by weight of chromium, a maximum of 0.1% by weight of carbon, 0.05-1.0% by weight of manganese, 0.1-0.5 % Silicon, 2.5-7% by weight aluminum, 0.01-0.1% by weight zircon, maximum 0.1% by weight titanium, 0.001-0.01% by weight calcium, 0.01-0.1% by weight of vanadium, 0.001-0.02% by weight of tin and rare earth metals in an amount of 0.02-0.1% by weight and a remainder of iron with the usual accompanying elements to an amount of 100 wt .-%, by a metal foil made of the alloy according to the invention and by an exhaust gas purification unit with a metal foil made of the alloy according to the invention as a carrier film. Advantageous developments of the aforementioned alloy and the metal foil are described in the subclaims.

Abgasreinigungseinheiten im Sinne der Anmeldung sind grundsätzlich alle Komponenten, die zur Reinigung von Abgasen eingesetzt werden können. Abgasreinigungseinheiten sind insbesondere Abgaskatalysatoren, Partikelfilter und Mischer, die in einer einem Motor nachgelegten Abgasanlage zur Reduzierung der Schadstoffemission eingesetzt werden.Exhaust gas cleaning units in the sense of the registration are basically all components that can be used for cleaning exhaust gases. Exhaust gas cleaning units are, in particular, exhaust gas catalytic converters, particle filters and mixers, which are used in an exhaust gas system placed behind an engine to reduce pollutant emissions.

Kern der Erfindung ist die Überlegung, die bisherige Konzeption von Abgasreinigungseinheiten durch Verwendung eines neuen Werkstoffs für die Metallfolie beizubehalten. Die erfindungsgemäße Legierung zeichnet sich insbesondere dadurch aus, daß sie zur kostengünstigen Herstellung einer Trägerfolie verwendet werden kann. Da die aus der erfindungsgemäßen Legierung hergestellten Trägerfolien zudem alle Anforderungen an den Einsatz an Nutzfahrzeugen erfüllen, ermöglicht deren Verwendung die kostengünstige Herstellung von gegenüber Abgaskatalysatoren für PKWs konstruktiv unveränderten Abgaskatalysatoren, die auch für den Einsatz an LKW Motoren geeignet sind. Grundlegende, d.h. komplizierte und kostenintensive Änderungen des konstruktiven Aufbaus der Abgasreinigungseinheiten zur Anpassung an die Bedürfnisse von LKW Motoren können unterbleiben.The core of the invention is the consideration of maintaining the previous conception of exhaust gas cleaning units by using a new material for the metal foil. The alloy according to the invention is characterized in particular by the fact that it can be used for the cost-effective production of a carrier film. Since the carrier foils produced from the alloy according to the invention also meet all the requirements for use on commercial vehicles, their use enables the inexpensive production of exhaust-gas catalysts which are structurally unchanged compared to exhaust-gas catalysts for cars and which are also suitable for use on truck engines. Basic, i.e. Complicated and cost-intensive changes to the design of the exhaust gas cleaning units to adapt to the needs of truck engines can be avoided.

Die erfindungsgemäße Legierung weist eine hohe Oxidationsbeständigkeit von mehr als ιooo°C auf. Dies wird durch das Zulegieren der sauerstoffaffinen Elemente Aluminium sowie Chrom erreicht, welche unter Luftsauerstoff dichte, langsam wachsende, das darun- ter liegende Material effektiv gegen Korrosionsangriff schützende Oxidschichten ausbilden. Dabei bieten Aluminiumoxidschichten gegenüber Chromoxidschichten generell eine Reihe von Vorteilen. Sie wachsen wegen der dichteren Packung des Aluminiumoxids langsamer, sie dampfen, anders als Chromoxid, auch bei Temperaturen um ιooo°C nicht ab und ihre Schutzwirkung bleibt auch unter sauerstoffarmen Bedingungen erhalten, unter denen sich Chromoxide nicht mehr bilden können. Das Zulegieren von Chrom hat den Effekt, daß die Aluminiumoxidbildung technischer Legierungen begünstigt wird.The alloy according to the invention has a high resistance to oxidation of more than 100 ° C. This is achieved by alloying the oxygen-affine elements aluminum and chrome, which are dense, slow-growing under atmospheric oxygen, the Effectively form the underlying material against corrosion attack protective oxide layers. Aluminum oxide layers generally offer a number of advantages over chromium oxide layers. They grow more slowly because of the denser packing of the aluminum oxide, unlike chromium oxide, they do not evaporate even at temperatures around 100 ° C and their protective effect is retained even under low-oxygen conditions under which chromium oxides can no longer form. The addition of chromium has the effect of promoting the formation of aluminum oxide in technical alloys.

Wesentliches Merkmal der Erfindung ist die Legierung aus Chrom und Aluminium mit den Zusätzen aus Kalzium und Seltenen Erdmetallen. Die Elemente Zirkon und Titan sowie die Seltenen Erdmetalle verbessern das Verhalten unter dem Einfluß zyklisch wechselnder sowie langanhaltender Temperaturbelastung und verbessern den Verbund zwischen Oxidschicht und Grundmatrix. Diese Elemente fördern ferner gemeinsam mit Chrom und Aluminium die Beständigkeit der während der Oxidation entstehenden Schutzschichten. Neben der Verbesserung der Werkstoffeigenschaften ist im wesentlichen für alle hier genannten Elemente in geringen Konzentrationen eine hohe Sauerstoffaffinität charakteristisch. Daraus resultiert eine verzögerte Verzunderung von Chrom und Aluminium und zusätzlich wird das Haftvermögen der gebildeten Oxidschichten verbessert. Die Verwendung von Niob dient zur Steigerung der Festigkeit, indem es als Karbid- und Nitridbildner fungiert.An essential feature of the invention is the alloy of chrome and aluminum with the additions of calcium and rare earth metals. The elements zirconium and titanium as well as the rare earth metals improve the behavior under the influence of cyclically changing and long-lasting temperature loads and improve the bond between the oxide layer and the basic matrix. Together with chrome and aluminum, these elements also promote the resistance of the protective layers formed during the oxidation. In addition to the improvement of the material properties, a high oxygen affinity is characteristic for all elements mentioned here in low concentrations. This results in a delayed scaling of chrome and aluminum and the adhesion of the oxide layers formed is also improved. The use of niobium serves to increase strength by acting as a carbide and nitride former.

Durch die Zusätze von mehreren sauerstoffaffinen Elementen in Kombination sowie von Seltenen Erdmetallen ergibt sich ferner eine hitzebeständige Stahllegierung für erhöhte Anwendungstemperaturen. Die Legierung bildet bei erhöhten Temperaturen auch bei wechselnder Belastung eine festhaftende Aluminiumoxidschicht. Die Legierungselemente erhöhen zudem die Duktilität und die Formstabilität der aus der Legierung hergestellten Metallfolien auch in einem Temperaturbereich oberhalb von ιooo°C.The addition of several oxygen-related elements in combination as well as rare earth metals results in a heat-resistant steel alloy for higher application temperatures. The alloy forms a firmly adhering aluminum oxide layer at elevated temperatures even under changing loads. The alloying elements also increase the ductility and the dimensional stability of the metal foils produced from the alloy, even in a temperature range above 100 ° C.

In den aus der erfindungsgemäßen Legierung hergestellten Metallfolien bewirken die folgenden Elemente folgende Eigenschaften. Chrom und Aluminium dienen zur Erhöhung des Oxidationswiderstandes. Hohe Gehalte sind Voraussetzung für eine lange Lebensdauer vor allem bei zyklisch auftretenden Temperaturbelastungen. Das Zirkon bewirkt zudem, daß der Chromanteil auch bei thermischen Belastungen in der MikroStruktur in metallischer Form erhalten bleibt. Titan hat im wesentlichen den gleichen Effekt, jedoch sind die Auswirkungen auf das Widerstandsverhalten, die Zunderbeständigkeit sowie die mechanischen Eigenschaften bei erhöhten Temperaturen geringer als bei Zirkon als zusätzlichem Legierungselement. Der Zusatz von Kalcium hat eine positive Auswirkung auf die Oxidati- onsbeständigkeit bei höheren Temperaturen.In the metal foils produced from the alloy according to the invention, the following elements have the following properties. Chromium and aluminum serve to increase the oxidation resistance. High levels are a prerequisite for a long service life, especially with cyclical temperature loads. The zircon also ensures that the chromium content is retained in metallic form even in the event of thermal loads in the microstructure. Titan has essentially the same effect, but they are Effects on the resistance behavior, the scaling resistance as well as the mechanical properties at elevated temperatures lower than with zircon as an additional alloying element. The addition of calcium has a positive effect on the resistance to oxidation at higher temperatures.

Die Legierung weist eine ausreichende Thermoschockbeständigkeit auf. Ferner besteht eine ausreichende Kriechfestigkeit, die eine unerwünschte Verformung verhindert. Sie läßt sich wirtschaftlich, d.h. mit hoher Ausbringung und möglichst geringem Einsatz an Energie mit konventionellen Verfahren schmelzmetallurgisch, großtechnisch herstellen. Die Legierung weist eine ausreichende Duktilität auf, um eine kostengünstige Kaltverformung zu dünnen Metallfolien und das Aufwickeln und weiteres Verformen dieser Metallfolien zu Trägermaterial zu ermöglichen.The alloy has sufficient thermal shock resistance. There is also sufficient creep resistance to prevent undesirable deformation. It can be economically, i.e. with high output and the least possible use of energy with conventional processes using large-scale melting metallurgy. The alloy has sufficient ductility to enable low-cost cold forming into thin metal foils and the winding and further shaping of these metal foils into carrier material.

Zudem eignet sich die Legierung zum Erzeugen einer Textur auf der Metallfolie während einer Kaltverformung der Legierung zu dünnen Metallfolien. Die Textur der Metallfolien kann dabei durch Einstellen der Produktions-Parameter so gewählt werden, daß sie einer gewünschten raumzentrierten metallischen polykristallinen Texturentwicklung entspricht. Hierdurch wird die Verformbarkeit der Metallfolien erhöht und deren Weiterverarbeitung erleichtert.The alloy is also suitable for creating a texture on the metal foil during cold deformation of the alloy into thin metal foils. The texture of the metal foils can be selected by adjusting the production parameters so that it corresponds to a desired body-centered metallic polycrystalline texture development. This increases the deformability of the metal foils and facilitates their further processing.

Die Verwendung einer Metallfolie aus einer erfindungsgemäßen Legierung als Trägerfolie ermöglicht aufgrund der geringen Kosten für die Herstellung der Legierung sowie aufgrund der geringen Kosten bei der Weiterverarbeitung zu einer Trägerfolie die kostengünstige Herstellung einer Abgasreinigungseinheit, so daß auch großvolumige Abgaskatalysatoren für LKW Motoren wirtschaftlich hergestellt werden können.The use of a metal foil made of an alloy according to the invention as a carrier foil enables the low-cost production of an exhaust gas cleaning unit due to the low costs for the production of the alloy and due to the low costs for further processing into a carrier foil, so that even large-volume exhaust gas catalysts for truck engines can be produced economically.

In einer erfindungsgemäßen Abgasreinigungseinheit verhindert die Verwendung einer Metallfolie aus der erfindungsgemäßen Legierung als Trägerfolie auch nach längeren Laufzeiten der Abgasreinigungseinheit das Auftreten einer sogenannten „breakaway corrosion", d.h. das Abplatzen der schützenden Oxidschichten aufgrund des mit der Zeit exponentiellen Anstiegs der Korrosionsschichtdicke in Folge einer Verarmung eines deckschichtbildenden Elements wird zuverlässig verhindert. Eine deutliche Verzögerung der "breakaway corosion" wird dabei durch das Zurverfügungstellen des die Deckschicht bildenden Elements in einer ausreichenden, eine Ausheilung zerstörter Deckschichten ermöglichenden Menge erreicht.In an exhaust gas cleaning unit according to the invention, the use of a metal foil made of the alloy according to the invention as a carrier foil prevents the occurrence of a so-called "breakaway corrosion" even after longer running times of the exhaust gas cleaning unit, i.e. the protective oxide layers flaking off due to the exponential increase in the thickness of the corrosion layer over time as a result of depletion A significant delay in the "breakaway corosion" is prevented by the provision of the element forming the cover layer in an adequate cover layer which has been destroyed enabling amount reached.

Die erfindungsgemäße Abgasreinigungseinheit zeichnet sich ferner durch ihre hohe Lebensdauer aus, die aus der Langlebigkeit der aus der erfindungsgemäßen Legierung hergestellten Metallfolie resultiert. Die Abstimmung und Zusammensetzung der Legierungsinhalte ist dabei so gewählt, daß trotz einer geringen Foliendicke und des daraus nur begrenzten Reservoirs an Aluminium zum Ausheilen der zerstörten Schichten eine sichere Kalt- und Warmformgebung des Werkstoffs möglich ist.The exhaust gas purification unit according to the invention is further characterized by its long service life, which results from the longevity of the metal foil produced from the alloy according to the invention. The coordination and composition of the alloy contents is chosen so that, despite a small foil thickness and the resulting limited aluminum reservoir for healing the destroyed layers, a safe cold and hot shaping of the material is possible.

Derartige Abgasreinigungseinheiten eignen sich zum Einbau in Kraftfahrzeuge aller Art und ermöglicht dort eine deutliche Verringerung der Schadstoffemissionen.Such exhaust gas purification units are suitable for installation in all types of motor vehicles and enable a significant reduction in pollutant emissions there.

Ferner eignet sich die erfindungsgemäße Abgasreinigungseinheit zum Einbau sowohl vor als auch hinter einem ggf. vorhandenen Abgasturbolader. Die Abgasreinigungseinheit erfüllt die erhöhten Anforderungen an die Vibrationsbeständigkeit. Die hohe Thermo- schock- und Temperaturwechselfestigkeit der aus der erfindungsgemäßen Legierung hergestellten Metallfolien reicht aus, um die beim Anlassen und Abstellen des Motors auftretenden starken Temperaturwechsel am Abgaskatalysator auszuhalten. Die Kriechfestigkeit der Legierung verhindert eine unzulässige Verformung des Abgaskatalysators, wodurch ein Aufreißen der Oxidschichten bewirkt und das Auftreten der „breakaway corrosion" begünstigt werden könnte.Furthermore, the exhaust gas purification unit according to the invention is suitable for installation both in front of and behind an exhaust gas turbocharger which may be present. The exhaust gas cleaning unit meets the increased requirements for vibration resistance. The high thermal shock and thermal shock resistance of the metal foils produced from the alloy according to the invention is sufficient to withstand the strong temperature changes on the exhaust gas catalytic converter which occur when the engine is started and switched off. The creep resistance of the alloy prevents inadmissible deformation of the exhaust gas catalytic converter, as a result of which the oxide layers are torn open and the occurrence of "breakaway corrosion" could be promoted.

Gegenüber Abgaskatalysatoren auf Keramikbasis weist die erfindungsgemäße Abgasreinigungseinheit durch die Verwendung einer erfindungsgemäßen Metallfolie eine höhere Zellenzahl auf, so daß bis zum Erreichen der notwendigen Betriebstemperatur der Abgasreinigungseinheit Schadstoffe in höheren Mengen zwischengespeichert werden können.Compared to ceramic-based exhaust gas catalysts, the exhaust gas cleaning unit according to the invention has a higher number of cells due to the use of a metal foil according to the invention, so that pollutants can be temporarily stored in larger amounts until the necessary operating temperature of the exhaust gas cleaning unit is reached.

Nach einer vorteilhaften Weiterbildung der Erfindung weist die Metallfolie eine Dicke von mindestens 15 μm auf. Abgasreinigungseinheit, die unter Verwendung derart dünner Metallfolien hergestellt wurden, weisen im Gegensatz zu entsprechenden Abgasreinigungseinheiten auf Keramikbasis eine erhöhte Vibrationsbeständigkeit auf. Ferner kann durch die Verwendung derartiger Metallfolien in einer Abgasreinigungseinheit die Zellenzahl der Abgasreinigungseinheit weiter erhöht und somit das Zwischenspeichervolumen für Schadstoffe weiter gesteigert werden. Zudem erreichen derart ausgebildete Abgasreinigungsein- heit schneller die notwendige Betriebstemperatur, so daß die Schadstoffemission weiter reduziert werden kann.According to an advantageous development of the invention, the metal foil has a thickness of at least 15 μm. Exhaust gas cleaning units, which were manufactured using such thin metal foils, have an increased vibration resistance in contrast to corresponding exhaust gas cleaning units based on ceramics. Furthermore, by using metal foils of this type in an exhaust gas cleaning unit, the number of cells in the exhaust gas cleaning unit can be further increased, and thus the intermediate storage volume for pollutants can be further increased. In addition, emission control devices designed in this way reach unit faster the necessary operating temperature so that the pollutant emissions can be reduced further.

Abgenutzte Abgasreinigunseinheiten der erfindungsgemäßen Art können nahezu vollständig der Wiederverwendung zugefügt werden. Eine keramische Beschichtung, welche auf die zu Waben geformten Metallfolien aufgebracht ist, kann effektiv und umweltschonend von den Metallfolien getrennt werden. Dabei fallen die wertvollen Edelmetalle in hoher Konzentration in der dann separierten Beschichtung an. Auch die hochlegierten Metallfolien können dem Recycling zugeführt werden.Worn exhaust gas purification units of the type according to the invention can be added almost completely to reuse. A ceramic coating, which is applied to the metal foils formed into honeycombs, can be separated from the metal foils effectively and in an environmentally friendly manner. The valuable precious metals accumulate in high concentration in the then separated coating. The high-alloy metal foils can also be recycled.

Ein Ausführungsbeispiel der Erfindung wird nachstehend mit Bezug auf die Zeichnung näher erläutert.An embodiment of the invention is explained below with reference to the drawing.

Figur 1 zeigt den schematischen Aufbau einer Abgaseinheit l, der im Betrieb an einem Kraftfahrzeug in eine hier nicht dargestellte Abgasanlage integriert ist. Die Abgaseinheit wird durch mehrere Metallfolien 3 gebildet, die ineinander verschlungen in einem zylindrischen Gehäuse 2 angeordnet sind.FIG. 1 shows the schematic structure of an exhaust gas unit 1, which is integrated into an exhaust gas system (not shown) during operation on a motor vehicle. The exhaust gas unit is formed by a plurality of metal foils 3, which are arranged intertwined in a cylindrical housing 2.

Nach schmelzmetallurgischer Herstellung der Legierung bestehend aus 17,5 Gew.-% Chrom, 0,03 Gew.- Kohlenstoff, 0,1 Gew.-% Mangan, 0,2 Gew.-% Silizium, 3,9 Gew.-% Aluminium,0,03 Gew.-% Zirkon, 0,03 Gew.-% Titan, 0,001 Gew.- Phosphor, 0,001 Gew.- % Schwefel, 0,004 Gew.-% Kalzium, 0,008 Gew.-% Niob, 0,04 Gew.-% Vanadium, 0,005 Gew.-% Zinn, o,ι Gew.-% Nickel, 0,005 Gew.-% Magnesium, 0,005 Gew.-% Stickstoff, 0,04 Gew.-% Kupfer, 0,005 Gew.-% Blei, 0,03 Gew.-% Molybdän, Seltenen Erdmetallen in einer Menge von 0,05 Gew.-% und Eisen mit den üblichen Begleitelementen wurde diese als Strang abgegossen. Durch Kaltwalzen wurde die Legierung anschließend zu den Metallfolien 3 verarbeitet, die in der Abgaseinheit 1 eingesetzt werden und eine Dicke von mindestens 15 μm aufweisen.After the metallurgical production of the alloy consisting of 17.5% by weight of chromium, 0.03% by weight of carbon, 0.1% by weight of manganese, 0.2% by weight of silicon, 3.9% by weight of aluminum , 0.03% by weight of zirconium, 0.03% by weight of titanium, 0.001% by weight of phosphorus, 0.001% by weight of sulfur, 0.004% by weight of calcium, 0.008% by weight of niobium, 0.04% by weight % Vanadium, 0.005% by weight tin, 0.1% by weight nickel, 0.005% by weight magnesium, 0.005% by weight nitrogen, 0.04% by weight copper, 0.005% by weight lead , 0.03 wt .-% molybdenum, rare earth metals in an amount of 0.05 wt .-% and iron with the usual accompanying elements, these were cast as a strand. The alloy was then processed by cold rolling into the metal foils 3, which are used in the exhaust gas unit 1 and have a thickness of at least 15 μm.

Die Metallfolien 3 erstrecken sich im Abgaskatalysator 1 ausgehend von der Gehäusewand evolventenförmig in Richtung auf die Mittelachse des zylinderförmigen Gehäuses 2 mit jeweils abwechselnder Krümmungsrichtung um drei um die Mittelachse des Gehäuses 2 angeordnete Umkehrlinien 4a, 4b, 4c. An der Innenwand des Gehäuses 2 sind die Metallfolien 3 durch Hartlöten mit dem Gehäuse 2 verbunden. The metal foils 3 extend in the exhaust gas catalytic converter 1 in an involute manner from the housing wall in the direction of the central axis of the cylindrical housing 2, each with an alternating direction of curvature around three reversal lines 4a, 4b, 4c arranged around the central axis of the housing 2. On the inner wall of the housing 2, the metal foils 3 are connected to the housing 2 by brazing.

Claims

Ansprüche Expectations 1. Eisenlegierung, insbesondere zur Verwendung als Trägerfolie in einer Abgasreinigungseinheit mit - 15-22 Gew.-% Chrom, maximal 0,1 Gew.-% Kohlenstoff,1. Iron alloy, in particular for use as a carrier foil in an exhaust gas cleaning unit with - 15-22% by weight chromium, maximum 0.1% by weight carbon, 0,05-1,0 Gew.-% Mangan,0.05-1.0% by weight of manganese, 0,1-0,5 Gew.-% Silizium,0.1-0.5% by weight silicon, 2,5-7 Gew.-% Aluminium, - 0,01-0,1 Gew.-% Zirkon, maximal 0,1 Gew.-% Titan,2.5-7% by weight aluminum, 0.01-0.1% by weight zircon, maximum 0.1% by weight titanium, 0,001-0,01 Gew.-% Kalzium,0.001-0.01% by weight calcium, 0,01-0,1 Gew. -% Vanadium,0.01-0.1% by weight of vanadium, 0,001-0,02 Gew.-% Zinn und - Seltene Erdmetalle in einer Menge von 0,02-0,1 Gew.-% sowie einen Rest Eisen mit den üblichen Begleitelementen bis auf eine Menge von 100 Gew.-%.0.001-0.02% by weight of tin and rare earth metals in an amount of 0.02-0.1% by weight as well as a remainder of iron with the usual accompanying elements up to an amount of 100% by weight. 2. Eisenlegierung nach Anspruch 1, dadurch gekennzeichnet, daß diese - 17-18 Gew.- Chrom,2. iron alloy according to claim 1, characterized in that these - 17-18 wt .- chromium, 0,02-0,05 Gew.-% Kohlenstoff, maximal 0,2 Gew.-% Mangan, maximal 0,3 Gew.-% Silizium,0.02-0.05% by weight carbon, maximum 0.2% by weight manganese, maximum 0.3% by weight silicon, 3,7-4,3 Gew.-% Aluminium, - 0,02-0,04 Gew.-% Zirkon, maximal 0,05 Gew.-% Titan,3.7-4.3% by weight aluminum, 0.02-0.04% by weight zirconium, maximum 0.05% by weight titanium, 0,003-0,005 Gew.- Kalzium,0.003-0.005% by weight calcium, 0,03-0,05 Gew.-% Vanadium, maximal 0,01 Gew.-% Zinn und - Seltene Erdmetalle in einer Menge von 0,03-0,07 Gew.-% sowie einen Rest0.03-0.05% by weight of vanadium, a maximum of 0.01% by weight of tin and - rare earth metals in an amount of 0.03-0.07% by weight as well as a remainder Eisen mit den üblichen Begleitelementen bis auf eine Menge von 100 Gew.-% enthält. Contains iron with the usual accompanying elements up to an amount of 100 wt .-%. 3. Eisenlegierung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß diese3. Iron alloy according to claim 1 or 2, characterized in that this 19 - 21 Gew.-% Chrom, 0,02-0,05 Gew.-% Kohlenstoff, maximal 0,2 Gew.-% Mangan, - maximal 0,3 Gew.-% Silizium,19-21% by weight of chromium, 0.02-0.05% by weight of carbon, maximum 0.2% by weight of manganese, - maximum 0.3% by weight of silicon, 5,0-6,0 Gew.-% Aluminium, 0,02-0,04 Gew.-% Zirkon, maximal 0,05 Gew.-% Titan, 0,003-0,005 Gew.- Kalzium - 0,03-0,05 Gew.-% Vanadium, maximal 0,01 Gew.-% Zinn und5.0-6.0% by weight aluminum, 0.02-0.04% by weight zircon, maximum 0.05% by weight titanium, 0.003-0.005% by weight calcium - 0.03-0, 05% by weight vanadium, maximum 0.01% by weight tin and Seltene Erdmetalle in einer Menge von 0,03-0,07 Gew.-% sowie einen Rest Eisen mit den üblichen Begleitelementen bis auf eine Menge von 100 Gew.-% enthält.Contains rare earth metals in an amount of 0.03-0.07% by weight as well as a remainder of iron with the usual accompanying elements up to an amount of 100% by weight. 4. Eisenlegierung nach einem oder mehreren der vorhergenden Ansprüchen, dadurch gekennzeichnet, daß diese zusätzlich maximal 0,5 Gew.-%, vorzugsweise maximal 0,15 Gew.-% Nickel enthält.4. Iron alloy according to one or more of the preceding claims, characterized in that it additionally contains a maximum of 0.5% by weight, preferably a maximum of 0.15% by weight of nickel. 5. Eisenlegierung nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß diese zusätzlich maximal 0,01 Gew.-%, vorzugsweise maximal 0,007 Gew.- Magnesium enthält.5. Iron alloy according to one or more of the preceding claims, characterized in that it additionally contains a maximum of 0.01% by weight, preferably a maximum of 0.007% by weight of magnesium. 6. Eisenlegierung nach einem oder mehreren der vorhergehenden Ansprüche, da- durch gekennzeichnet, daß diese 0,001-0,01 Gew.-%, vorzugsweise maximal 0,00756. Iron alloy according to one or more of the preceding claims, characterized in that it is 0.001-0.01% by weight, preferably at most 0.0075 Gew.- Stickstoff enthält.Wt. Nitrogen contains. 7. Eisenlegierung nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß diese 0,001-0,07 Gew.-%, vorzugsweise 0,03-0,05 Gew.- % Kupfer enthält.7. Iron alloy according to one or more of the preceding claims, characterized in that it contains 0.001-0.07% by weight, preferably 0.03-0.05% by weight of copper. 8. Eisenlegierung nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß diese 0,001-0,02 Gew.-%, vorzugsweise 0,006-0,01 Gew.-% Niob enthält. 8. Iron alloy according to one or more of the preceding claims, characterized in that it contains 0.001-0.02% by weight, preferably 0.006-0.01% by weight, of niobium. 9. Eisenlegierung nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß diese 0,001-0,025 Gew.-96, vorzugsweise maximal 0,015 Gew.-% Phosphor enthält.9. Iron alloy according to one or more of the preceding claims, characterized in that it contains 0.001-0.025% by weight of 96, preferably a maximum of 0.015% by weight of phosphorus. 10. Eisenlegierung nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß diese maximal 0,003 Gew.-96, vorzugsweise maximal 0,002 Gew.-96 Schwefel enthält.10. Iron alloy according to one or more of the preceding claims, characterized in that it contains a maximum of 0.003 wt-96, preferably a maximum of 0.002 wt-96 sulfur. 11. Eisenlegierung nach einem oder mehreren der vorhergenden Ansprüche, dadurch gekennzeichnet, daß die Seltenen Erdmetalle Lanthan in einer Menge von 0,006- 0,04 Gew.- , vorzugsweise 0,008-0,03 Gew. -96 umfassen.11. Iron alloy according to one or more of the preceding claims, characterized in that the rare earth metals comprise lanthanum in an amount of 0.006-0.04 wt.%, Preferably 0.008-0.03 wt. -96. 12. Eisenlegierung nach einem oder mehreren der vorhergehenden Ansprüche, da- durch gekennzeichnet, daß diese maximal 0,1 Gew. -9 , vorzugsweise maximal 0,0812. Iron alloy according to one or more of the preceding claims, characterized in that it has a maximum of 0.1% by weight, preferably a maximum of 0.08 Gew. -96 Molybdän enthält.Wt. -96 contains molybdenum. 13. Eisenlegierung nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß diese maximal 0,015 Gew.-96, vorzugsweise maximal 0,01 Gew.-% Blei enthält.13. Iron alloy according to one or more of the preceding claims, characterized in that it contains a maximum of 0.015% by weight, preferably a maximum of 0.01% by weight, of lead. 14. Metallfolie, insbesondere zur Verwendung in einer Abgasreinigungseinheit, dadurch gekennzeichnet, daß sie aus einer Legierung nach einem oder mehreren der Ansprüche 1 bis 13 hergestellt ist.14. Metal foil, in particular for use in an exhaust gas cleaning unit, characterized in that it is made of an alloy according to one or more of claims 1 to 13. 15. Metallfolie nach Anspruch 14, dadurch gekennzeichnet, daß diese eine walztechnisch einstellbare Textur aufweist.15. Metal foil according to claim 14, characterized in that it has a texture that can be adjusted by rolling technology. 16. Metallfolie nach Anspruch 14 oder 15, dadurch gekennzeichnet, daß die Textur derart ausgebildet ist, daß die Metallfolie eine hohe Verformbarkeit aufweist.16. Metal foil according to claim 14 or 15, characterized in that the texture is formed such that the metal foil has a high deformability. 17. Metallfolie nach einem oder mehreren der Ansprüche 14 bis 16, dadurch gekennzeichnet, daß diese eine Dicke von mindestens 15 μm aufweist. 17. Metal foil according to one or more of claims 14 to 16, characterized in that it has a thickness of at least 15 microns. 8. Abgasreinigungseinheit, insbesondere ein Abgaskatalysator, Partikelfilter oder Mischer zum Einsatz in Kraftfahrzeugen zur Reduzierung der Schadstoffemission, dadurch gekennzeichnet, daß die Abgasreinigungseinheit (1) als Trägerfolie eine Metallfolie (3) gemäß einem oder mehreren der Ansprüche 14 bis 17 aufweist. 8. exhaust gas cleaning unit, in particular an exhaust gas catalytic converter, particle filter or mixer for use in motor vehicles to reduce pollutant emissions, characterized in that the exhaust gas cleaning unit (1) has a metal foil (3) as a carrier film according to one or more of claims 14 to 17.
PCT/EP2003/014355 2002-12-20 2003-12-16 Iron alloy, especially for use in an exhaust gas cleaning unit Ceased WO2004059025A1 (en)

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DE10261207A1 (en) 2004-07-15
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