EP0929883B1 - Element d'affichage utilise dans un systeme antivol magnetique - Google Patents

Element d'affichage utilise dans un systeme antivol magnetique Download PDF

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Publication number
EP0929883B1
EP0929883B1 EP98944989A EP98944989A EP0929883B1 EP 0929883 B1 EP0929883 B1 EP 0929883B1 EP 98944989 A EP98944989 A EP 98944989A EP 98944989 A EP98944989 A EP 98944989A EP 0929883 B1 EP0929883 B1 EP 0929883B1
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Prior art keywords
weight
alloy
strip
approximately
hard magnetic
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EP98944989A
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German (de)
English (en)
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EP0929883A1 (fr
Inventor
Hartwin Weber
Gernot Hausch
Ottmar Roth
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Vacuumschmelze GmbH and Co KG
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Vacuumschmelze GmbH and Co KG
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    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/24—Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
    • G08B13/2405—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used
    • G08B13/2408—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used using ferromagnetic tags
    • 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
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • 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
    • C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
    • 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
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • 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
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/24—Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
    • G08B13/2428—Tag details
    • G08B13/2437—Tag layered structure, processes for making layered tags
    • G08B13/2442—Tag materials and material properties thereof, e.g. magnetic material details
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/24—Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
    • G08B13/2428—Tag details
    • G08B13/2437—Tag layered structure, processes for making layered tags
    • G08B13/2445—Tag integrated into item to be protected, e.g. source tagging
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
    • H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
    • H01F1/047—Alloys characterised by their composition
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
    • H01F1/147—Alloys characterised by their composition
    • H01F1/14708—Fe-Ni based alloys
    • H01F1/14716—Fe-Ni based alloys in the form of sheets
    • 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
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
    • C21D8/1222—Hot rolling
    • 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
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
    • C21D8/1233—Cold rolling
    • 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
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
    • C21D8/1261—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest following hot rolling
    • 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
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
    • C21D8/1266—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest between cold rolling steps
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/90—Magnetic feature
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/922—Static electricity metal bleed-off metallic stock
    • Y10S428/9265—Special properties
    • Y10S428/928—Magnetic property
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12465—All metal or with adjacent metals having magnetic properties, or preformed fiber orientation coordinate with shape
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12639—Adjacent, identical composition, components
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12639—Adjacent, identical composition, components
    • Y10T428/12646—Group VIII or IB metal-base
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12639—Adjacent, identical composition, components
    • Y10T428/12646—Group VIII or IB metal-base
    • Y10T428/12653—Fe, containing 0.01-1.7% carbon [i.e., steel]
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12771—Transition metal-base component
    • Y10T428/12861—Group VIII or IB metal-base component
    • Y10T428/12951—Fe-base component
    • Y10T428/12958—Next to Fe-base component
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12986—Adjacent functionally defined components

Definitions

  • Such magnetic anti-theft systems and indicators are well known and for example in the EP 0 121 649 B1 or described in detail in WO 90/03652.
  • magnetoelastic systems in which the activation strip for activating the alarm strip serves by magnetization
  • harmonics Systems in which the activation strip according to its Magnetization serves to deactivate the alarm strip.
  • Alloys with semi-hard magnetic properties that are used for the bias strips Co-Fe-V alloys known as VICALLOY, Co-Fe-Ni alloys, known as VACOZET, as well as Fe-Co-Cr alloys.
  • VICALLOY Co-Fe-V alloys
  • VACOZET Co-Fe-Ni alloys
  • Fe-Co-Cr alloys Fe-Co-Cr alloys.
  • These well-known semi-hard magnetic alloys contain high proportions of cobalt, some of them at least 45 wt .-% and are accordingly expensive.
  • these alloys are magnetically final annealed Condition brittle so that they do not have sufficient ductility, to meet the requirements for the display elements for Anti-theft systems adequately.
  • An important requirement is that these activation strips insensitive to bending or deformation have to be.
  • the remanence under bending or tensile load should be as possible be small. As a guideline, a change becomes smaller 20% specified.
  • the object of the present invention is therefore to begin with mentioned display elements with regard to their bias strips to develop further in that the above Requirements are met.
  • this object is achieved in that the Pre-magnetization strips made from a semi-hard magnetic alloy consist of 8 to 25 wt .-% nickel, 1.5 to 4.5 % By weight aluminum, 0.5 to 3% by weight titanium and balance iron is.
  • the alloy can also contain 0 to 5% by weight of cobalt and / or 0 up to 3% by weight of molybdenum or chromium and / or at least one of the elements Zr, Hf, V, Nb, Ta, W, Mn, Si in individual Proportions of less than 0.5% by weight of the alloy and in one Total content of less than 1% by weight of the alloy and / or at least one of the elements C, N, S, P, B, H, O in individual proportions of less than 0.2% by weight of the alloy and in a total proportion of less than 1% by weight of the Alloy included.
  • the alloy is characterized by a coercive force H c of 10 to 24 A / cm and a remanence B r of at least 1.3 T (13,000 gaus).
  • the alloys of the invention are highly ductile and excellent cold workability before starting, so that cross-sectional reductions of more than 90% are also possible are.
  • Magnetic strips can be made from such alloys are produced, in particular by cold rolling, which Have thicknesses of less than 0.05 mm. Also stand out the alloys of the invention by excellent magnetic Properties and characterized by corrosion resistance.
  • a particularly advantageous alloy is a semi-hard magnetic Iron alloy according to the present invention, the 13.0 to 17.0 wt% nickel, 1.8 to 2.8 % By weight of aluminum and 0.5 to 1.5% by weight of titanium. Reducing the aluminum content can in particular the magnetostriction can be set particularly favorably.
  • the bias strips are through Melt the alloy under vacuum and pour into one Cast block made. Then the ingot becomes one Hot rolled strip at temperatures above 800 ° C, then at annealed at a temperature above 800 ° C and then cooled down quickly. After cold working, expediently Cold rolling in accordance with a reduction in cross section 90% is followed by intermediate annealing at approx. 700 ° C. Cold forming then takes place, expediently Cold rolling, corresponding to a reduction in cross section of at least 60%, preferably 75% or higher, instead. As The last step is the cold rolled strip at temperatures tempered from approx. 400 ° C to 600 ° C. After that, the bias strips cut to length.
  • the ratio of the saturation for a given low magnetization field strength of, for example, 40 A / cm to the saturation B f for a magnetic field in the kOe range should be almost 1, which can be seen from FIG. 3.
  • the counter-field stability should be such that the remanence B S still retains at least 80% of its original value after a counter-field demagnetization of a few A / cm.
  • the remanence B r should only keep 20% of the original value.
  • the display elements must be such that they do not change their remanence B r very much in the vicinity of the coils in the detection locks as a result of a field which is elevated there and possibly oriented in the opposite direction.
  • the alloys according to the invention have such a required counter field stability.
  • the alloys of the present invention are typically by casting a melt from the alloy components in a crucible or oven under vacuum or under a protective gas atmosphere.
  • the temperatures are at about 1600 ° C.
  • the casting is typically done in a round mold.
  • the Cast ingots made from the present alloys then become typical through hot working, intermediate annealing, cold working and further intermediate annealing.
  • the intermediate glow takes place for the purpose of homogenization, grain refinement, deformation or the development of desirable mechanical properties, especially high ductility.
  • Heat treatment at preferably temperatures above 800 ° C, rapid cooling and starting.
  • Preferred tempering temperatures are around 400 ° C to 600 ° C and the starting times are typical from one minute to 24 hours.
  • Alloys are especially cold worked a reduction in cross section of at least 60% before Starting possible.
  • Example 2 An alloy with 15.0% by weight of nickel, 3.0% by weight of aluminum, 1.2% by weight of titanium and the rest of iron was processed as in Example 1, but with a final intermediate annealing at 700 ° C, one last cold deformation corresponding to a cross-sectional reduction of 70% and a final annealing at 500 ° C.
  • a coercive force H c equal to 21 A / cm and a remanence B r equal to 1.45 T were measured.
  • Example 2 An alloy with 15.0% by weight of nickel, 3.0% by weight of aluminum, 1.2% by weight of titanium and the rest of iron was produced as in Example 2. Deviating from this, the last intermediate annealing was carried out at 650 ° C, the last cold working corresponding to a cross-sectional reduction of 85% and the tempering treatment at 480 ° C. A coercive force H c equal to 20 A / cm and a remanence B r equal to 1.53 T were measured.
  • Example 2 An alloy with 15.0% by weight of nickel, 3.0% by weight of aluminum, 1.2% by weight of titanium, 2.0% by weight of molybdenum and the rest of iron was produced as in Example 2. After an annealing treatment at 480 ° C, a coercive force H c equal to 20 A / cm and a remanence B r equal to 1.56 T were measured.

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  • Physics & Mathematics (AREA)
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  • Metallurgy (AREA)
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  • Manufacturing & Machinery (AREA)
  • Thermal Sciences (AREA)
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  • Hard Magnetic Materials (AREA)
  • Manufacturing Of Steel Electrode Plates (AREA)
  • Soft Magnetic Materials (AREA)
  • Burglar Alarm Systems (AREA)

Abstract

L'invention concerne un alliage magnétique mi-dur destiné à des bandes d'activation dans un système antivol magnétique, qui contient 8 à 25 % en poids de Ni, 1,5 à 4,5 % en poids d'Al, 0,5 à 3 % en poids de Ti, le reste étant constitué de fer. Cet alliage se distingue des alliages connus déjà utilisés, par d'excellentes propriétés magnétiques et par une grande résistance à la corrosion. En outre, cet alliage présente une excellente déformabilité à froid avant le revenu.

Claims (3)

  1. Élément d'affichage utilisé dans un système antivol magnétique, comprenant ;
    1. une bande alarme allongée, composée d'un alliage ferromagnétique amorphe et au moins
    2. une bande de déclenchement, composée d'un alliage magnétique mi-dur
    caractérisé en ce que
    (a) l'alliage magnétique mi-dur comprend
       8 à 25 % en masse de Ni, 0,5 à 3 % en masse de Ti,
       1,5 à 4,5 % en masse de A1, le reste en Fe
    et
    (b) l'alliage peut également contenir :
    0 à 5 % en masse de Co et/ou 0 à 3 % en masse de Mo ou Cr, et/ou
    au moins un des éléments Zr, Hf, V, Nb, Ta, W, Mn, Si, en proportions individuelles de moins de 0,5 % en masse des alliages dans un total de moins de 1 % en masse de l'alliage et/ou,
    au moins un des éléments C, N, S, P, B, H, O, en proportions individuelles de moins de 0,2 % en masse de l'alliage et dans un total de moins de 1 % en masse de l'alliage, et
    (c) l'alliage magnétique mi-dur présente une force coercitive Hc de 10 à 24 A/cm et une rémanence Br d'au moins de 1,3 T (13 000 Gauss).
  2. Élément d'affichage selon la revendication 1,
    caractérisé en ce que
    l'alliage magnétique mi-dur comprend
    13 à 17 % en masse de Ni, 0,5 à 1,5 % en masse de Ti,
    1,8 à 2,8 % en masse de Al, le reste en Fe.
  3. Procédé de fabrication d'une bande de déclenchement selon les revendications 1 ou 2,
    caractérisé par
    les étapes suivantes :
    1. Fusion de l'alliage sous vide ou sous atmosphère modifiée puis coulage en un bloc coulé ;
    2. Déformation à chaud du bloc coulé en une bande sous une température supérieure à 800°C environ ;
    3. Recuit intermédiaire de la bande sous une température supérieure à 800°C environ ;
    4. Refroidissement rapide ;
    5. Déformation à froid par une réduction de section d'environ 90 % ;
    6. Recuit intermédiaire à 700°C environ ;
    7. Déformation à froid par une réduction de section d'au moins 85 % ;
    8. Recuit sous une température de 480°C environ ;
    9. Sectionnement et découpe à la longueur des bandes de déclenchement.
EP98944989A 1997-07-30 1998-07-15 Element d'affichage utilise dans un systeme antivol magnetique Expired - Lifetime EP0929883B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19732872 1997-07-30
DE19732872A DE19732872C2 (de) 1997-07-30 1997-07-30 Anzeigeelement für die Verwendung in einem magnetischen Diebstahlsicherungssystem
PCT/DE1998/001984 WO1999006977A1 (fr) 1997-07-30 1998-07-15 Element d'affichage utilise dans un systeme antivol magnetique

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EP0929883A1 EP0929883A1 (fr) 1999-07-21
EP0929883B1 true EP0929883B1 (fr) 2003-09-24

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EP (1) EP0929883B1 (fr)
JP (1) JP3288725B2 (fr)
DE (1) DE19732872C2 (fr)
ES (1) ES2209204T3 (fr)
WO (1) WO1999006977A1 (fr)

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Also Published As

Publication number Publication date
JP3288725B2 (ja) 2002-06-04
WO1999006977A1 (fr) 1999-02-11
US6689490B2 (en) 2004-02-10
DE19732872A1 (de) 1999-02-04
US20030129445A1 (en) 2003-07-10
JP2001502759A (ja) 2001-02-27
EP0929883A1 (fr) 1999-07-21
US6663981B1 (en) 2003-12-16
DE19732872C2 (de) 2002-04-18
ES2209204T3 (es) 2004-06-16

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