EP0634759A2 - Alliage à base de fer semi-dur et déformable pour aimant permanent - Google Patents

Alliage à base de fer semi-dur et déformable pour aimant permanent Download PDF

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Publication number
EP0634759A2
EP0634759A2 EP94110507A EP94110507A EP0634759A2 EP 0634759 A2 EP0634759 A2 EP 0634759A2 EP 94110507 A EP94110507 A EP 94110507A EP 94110507 A EP94110507 A EP 94110507A EP 0634759 A2 EP0634759 A2 EP 0634759A2
Authority
EP
European Patent Office
Prior art keywords
permanent magnet
hard
semi
alloy
magnet alloy
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP94110507A
Other languages
German (de)
English (en)
Other versions
EP0634759A3 (en
Inventor
Gernot Dr. Hausch
Gerhard Zieger
Ottmar Roth
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vacuumschmelze GmbH and Co KG
Original Assignee
Vacuumschmelze GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Vacuumschmelze GmbH and Co KG filed Critical Vacuumschmelze GmbH and Co KG
Publication of EP0634759A2 publication Critical patent/EP0634759A2/fr
Publication of EP0634759A3 publication Critical patent/EP0634759A3/xx
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • G08B13/2411—Tag deactivation
    • 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
    • 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
    • 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
    • H01F1/0302—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity characterised by unspecified or heterogeneous hardness or specially adapted for magnetic hardness transitions
    • H01F1/0306—Metals or alloys, e.g. LAVES phase alloys of the MgCu2-type
    • 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

Definitions

  • the invention relates to a semi-hard, deformable permanent magnet alloy, which essentially contains iron, additions of over 5% nickel and / or manganese together and at least one additional element for increasing the transformation temperature into austenite (As) in such amounts that a metastable austenitic alloy results, which contains a mixed structure of an alpha phase (martensite) and a gamma phase (austenite) by cold working and subsequent heat treatment.
  • As austenite
  • Alloys with 68 to 77 wt .-% iron, 9 to 20 wt .-% chromium and 13 to 23 wt .-% nickel are from G. Rassmann and O. Henkel (NACHRICHTENTECHNIK, 11 (1961), pp. 307-313 ) have been examined. After homogenization, these alloys are austenitic and unstable to deformation, i. H. Cold forming can convert measurable amounts of austenite into ferrite. The alpha phase (ferrite, martensite) generated by cold working can then be converted back to austenite by heat treatment. This thermomechanical treatment enables a coercive field strength in the range from 50 to 900 A / cm to be set with a remanent induction Br between 0.06 and 0.3 T.
  • the object of the present invention is to create a semi-hard deformable permanent magnet alloy which has a coercive field strength Hc in the range from more than 40 to 100 A / cm and a remanent induction Br above 0.8 T.
  • An alloy with such magnetic properties is particularly useful when used as an anti-theft strip needed.
  • the alloy together with the actual soft magnetic security strip, it serves to validate it at the cash register by magnetization, so that it can then no longer trigger an alarm.
  • the alloy is also suitable for other applications in which the requirements for coercive field strength and a minimum residual induction of over 0.8 T have to be met.
  • the magnetic properties can be adjusted by this spinodal separation.
  • a disadvantage of the properties of an alloy intended here is the heat treatment, which is difficult to adjust the coercive field strength, in particular in the case of large batches, it not always being possible to ensure that the same temperature actually exists in every part of a furnace filling.
  • an alloy with 67Fe-14Cr-7Ni-5Mo-10Co was hot-rolled at 1100 ° C. to 5 mm, then annealed at 1100 ° C for 1 h and quenched in water. In this state, the alloy is paramagnetic and austenitic. This alloy was then rolled to 0.5 mm, corresponding to 90% cold working. In this state, the alloy is ferromagnetic by converting the gamma to the alpha phase.
  • Table 1 shows alloys containing iron, Ni, Cr, Mo, Mn and partly Co and Ti. It can be seen that the magnetic values Br for the remanence induction and Hc for the coercive force are in the required range, provided the Co content is above 4.5% and the other additives are selected so that a metastable austenitic alloy results after the homogenization annealing . It can also be seen that particularly advantageous magnet values result if the degree of cold deformation is at least 90%.
  • Table 2 The same is shown in Table 2, in which the temperature of the final annealing was increased to 520 ° C., while Table 3 has the same alloys as in Table 2 for the test object and shows the influence of the temperature of the heat treatment.
  • the examples further show that a particularly advantageous composition is obtained if the cobalt content is greater than 4.5 and at most 12% and if a cold working of over 80% is carried out.
  • metastable austenitic alloys are characterized by the fact that the austenite can be converted to martensite either by cold working or by cooling below the transformation temperature of the austenite to martensite with the alpha phase, the conversion to martensite cannot be achieved by cold working or by cooling , if the proportions of Ni and Mn and the proportions of the other additives become too large. You then have to deal with stable austenitic alloys.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • Power Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Computer Security & Cryptography (AREA)
  • Dispersion Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Hard Magnetic Materials (AREA)
EP94110507A 1993-07-14 1994-07-06 Semi-hard and deformable iron based permanent magnet alloy. Withdrawn EP0634759A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4323497 1993-07-14
DE4323497 1993-07-14

Publications (2)

Publication Number Publication Date
EP0634759A2 true EP0634759A2 (fr) 1995-01-18
EP0634759A3 EP0634759A3 (en) 1995-02-22

Family

ID=6492736

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94110507A Withdrawn EP0634759A3 (en) 1993-07-14 1994-07-06 Semi-hard and deformable iron based permanent magnet alloy.

Country Status (2)

Country Link
EP (1) EP0634759A3 (fr)
JP (1) JPH0754107A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999014718A1 (fr) * 1997-09-17 1999-03-25 Vacuumschmelze Gmbh Element d'affichage utilise dans un systeme antivol magnetique
US6157301A (en) * 1996-12-13 2000-12-05 Vacuumschmelze Gmbh Marker for use in a magnetic electronic article surveillance system
WO2002031844A2 (fr) * 2000-10-10 2002-04-18 Crs Holdings, Inc. Alliages magnetiques tendres de co-mn-fe

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6868174B2 (ja) * 2019-10-10 2021-05-12 マグネデザイン株式会社 ステンレス磁石

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1282444A (fr) * 1960-03-04 1962-01-19 Beteiligungs & Patentverw Gmbh Alliage magnétique perfectionné avec caractéristique rectangulaire d'aimantation, son procédé d'obtention et son utilisation
FR2282736A1 (fr) * 1974-08-21 1976-03-19 Hitachi Ltd Materiau de construction d'un rotor utilisable dans un moteur a hysteresis a grande vitesse de rotation, et son procede d'obtention
US4007073A (en) * 1974-10-15 1977-02-08 Felix Lvovich Levin Method of producing articles having alternating magnetic and non-magnetic portions from continuous metal blanks
EP0239838A1 (fr) * 1986-04-04 1987-10-07 Vacuumschmelze GmbH Application d'un alliage trempé rapidement à base de fer, de chrome et de cobalt
JPH04254303A (ja) * 1991-02-06 1992-09-09 Toshiba Corp 永久磁石

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1282444A (fr) * 1960-03-04 1962-01-19 Beteiligungs & Patentverw Gmbh Alliage magnétique perfectionné avec caractéristique rectangulaire d'aimantation, son procédé d'obtention et son utilisation
FR2282736A1 (fr) * 1974-08-21 1976-03-19 Hitachi Ltd Materiau de construction d'un rotor utilisable dans un moteur a hysteresis a grande vitesse de rotation, et son procede d'obtention
US4007073A (en) * 1974-10-15 1977-02-08 Felix Lvovich Levin Method of producing articles having alternating magnetic and non-magnetic portions from continuous metal blanks
EP0239838A1 (fr) * 1986-04-04 1987-10-07 Vacuumschmelze GmbH Application d'un alliage trempé rapidement à base de fer, de chrome et de cobalt
JPH04254303A (ja) * 1991-02-06 1992-09-09 Toshiba Corp 永久磁石

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 17, no. 32 (E-1309) 21. Januar 1993 & JP-A-04 254 303 (TOSHIBA K.K.) *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6157301A (en) * 1996-12-13 2000-12-05 Vacuumschmelze Gmbh Marker for use in a magnetic electronic article surveillance system
WO1999014718A1 (fr) * 1997-09-17 1999-03-25 Vacuumschmelze Gmbh Element d'affichage utilise dans un systeme antivol magnetique
US6166636A (en) * 1997-09-17 2000-12-26 Vacuumschmelze Gmbh Marker for use in a magnetic anti-theft security system and method for making same
WO2002031844A2 (fr) * 2000-10-10 2002-04-18 Crs Holdings, Inc. Alliages magnetiques tendres de co-mn-fe
WO2002031844A3 (fr) * 2000-10-10 2002-11-21 Crs Holdings Inc Alliages magnetiques tendres de co-mn-fe

Also Published As

Publication number Publication date
JPH0754107A (ja) 1995-02-28
EP0634759A3 (en) 1995-02-22

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