EP0715320A1 - Iron based cobalt containing soft magnetic alloy for commutation and excitation of circuits - Google Patents

Iron based cobalt containing soft magnetic alloy for commutation and excitation of circuits Download PDF

Info

Publication number
EP0715320A1
EP0715320A1 EP95117334A EP95117334A EP0715320A1 EP 0715320 A1 EP0715320 A1 EP 0715320A1 EP 95117334 A EP95117334 A EP 95117334A EP 95117334 A EP95117334 A EP 95117334A EP 0715320 A1 EP0715320 A1 EP 0715320A1
Authority
EP
European Patent Office
Prior art keywords
soft magnetic
circuits
cobalt
vanadium
excitation
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Withdrawn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
EP95117334A
Other languages
German (de)
French (fr)
Inventor
Kurt Dr. Emmerich
Hartwin Dr. Weber
Hermann Dr. Wegerle
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 EP0715320A1 publication Critical patent/EP0715320A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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

  • Such alloys are known, for example, from the IEC standard of the "International Electrotechnical Commission" 1979, publ. 404-1, p. 47. These alloys have a cobalt content of 23 to 27% by weight and a small addition of vanadium or chromium to improve ductility. Such alloys are mainly used for applications that require high saturation flux densities or in which high temperatures occur.
  • the object of the present invention is now to address soft magnetic alloys which, like the known iron-based alloys with cobalt, have a high saturation flux density with low coercive force, but are additionally distinguished by an increased specific electrical resistance of the material.
  • This object is achieved according to the invention in that the alloy used contains 6-30% by weight of cobalt, 3-8% by weight of one or more of the elements chromium, molybdenum, vanadium, tungsten and the balance iron, including production-related impurities.

Abstract

A magnetically soft alloy based on iron with cobalt additive contains 6-30 wt. per cent cobalt, 3-8 wt. per cent of one or more of the elements chrome, molybdenum, vanadium, tungsten and the remainder iron, including impurities resulting from mfg. More specifically, the cobalt content of the alloy is within a range from 10 to 20 wt. per cent, and the content of chrome, molybdenum, vanadium, tungsten is between 4 and 8 wt. per cent.

Description

Die Erfindung betrifft die Verwendung einer weichmagnetischen Legierung auf Eisenbasis mit Kobalt zum Einsatz in magnetischen Schalt- oder Erregerkreisen, deren Koerzitivfeldstärke <= 3,2 A/cm und deren Sättigungsflußdichte > 1,9 Tesla beträgt. Derartige Legierungen sind beispielsweise aus der Norm IEC Standard der "Internationalen Elektrotechnischen Kommission" 1979, Publ. 404-1, S. 47, bekannt. Diese Legierungen besitzen einen Kobaltanteil von 23 bis 27 Gew.-% sowie einen kleinen Zusatz von Vanadium oder Chrom, um die Duktilität zu verbessern. Derartige Legierungen werden vorwiegend für Anwendungen eingesetzt, die hohe Sättigungsflußdichten erfordern oder bei denen hohe Temperaturen auftreten.The invention relates to the use of a soft magnetic alloy based on iron with cobalt for use in magnetic circuits or excitation circuits whose coercive field strength is <= 3.2 A / cm and whose saturation flux density is> 1.9 Tesla. Such alloys are known, for example, from the IEC standard of the "International Electrotechnical Commission" 1979, publ. 404-1, p. 47. These alloys have a cobalt content of 23 to 27% by weight and a small addition of vanadium or chromium to improve ductility. Such alloys are mainly used for applications that require high saturation flux densities or in which high temperatures occur.

Im Zuge der Automatisierung ist man bestrebt, in magnetischen Schaltkreisen immer schnellere Schaltzeiten zu erreichen sowie magnetische Erregerkreise für immer höhere Frequenzen einzusetzen. Diese Aufgaben erfordern, Wirbelströme zu minimieren, so daß sich z. B. eine schnelle Magnetisierung oder Entmagnetisierung eines magnetischen Kreises erreichen läßt.In the course of automation, efforts are being made to achieve ever faster switching times in magnetic circuits and to use magnetic excitation circuits for ever higher frequencies. These tasks require to minimize eddy currents, so that z. B. can achieve rapid magnetization or demagnetization of a magnetic circuit.

Dies ist am Beispiel eines magnetisch schaltenden Ventils in der Druckschrift der Society of Automotive Engineers Nr. 85042, 1985, S. 5, rechte Spalte oben, beschrieben. Um hier eine Verminderung der Wirbelströme und eine schnelle Schaltzeit zu erreichen, verwendet man Kerne, die aus einzelnen Blechen zusammengesetzt sind.This is described using the example of a magnetic switching valve in the publication of the Society of Automotive Engineers No. 85042, 1985, p. 5, right column above. In order to achieve a reduction in eddy currents and a fast switching time, cores are used that are composed of individual sheets.

Aus dem Buch "Weichmagnetische Werkstoffe" von R. Boll, 1990, S. 107, geht hervor, daß die Grenzfrequenz, bis zu der der Einfluß der Wirbeströme noch nicht überwiegt, u. a. proportional zum spezifischen elektrischen Widerstand des Materials und umgekehrt proportional zur Dicke der verwendeten Bleche im Schaltkreis ist.From the book "Soft Magnetic Materials" by R. Boll, 1990, p. 107, it appears that the cut-off frequency up to which the influence of the eddy currents does not yet predominate, u. a. is proportional to the specific electrical resistance of the material and inversely proportional to the thickness of the metal sheets used in the circuit.

Aufgabe der vorliegenden Erfindung ist es nun, weichmagnetische Legierungen anzugehen, die wie die bekannten Legierungen auf Eisenbasis mit Kobalt eine hohe Sättigungsflußdichte bei geringer Koerzitivfeldsträrke aufweisen, jedoch sich zusätzlich durch einen erhöhten spezifischen elektrischen Widerstand des Materials auszeichnen. Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die verwendete Legierung 6 - 30 Gew.-% Kobalt, 3 - 8 Gew.-% eines oder mehrerer der Elemente Chrom, Molybdän, Vanadium, Wolfram und als Rest Eisen einschließlich herstellungsbedingter Verunreinigungen enthält.The object of the present invention is now to address soft magnetic alloys which, like the known iron-based alloys with cobalt, have a high saturation flux density with low coercive force, but are additionally distinguished by an increased specific electrical resistance of the material. This object is achieved according to the invention in that the alloy used contains 6-30% by weight of cobalt, 3-8% by weight of one or more of the elements chromium, molybdenum, vanadium, tungsten and the balance iron, including production-related impurities.

Besonders vorteilhafte Legierungsbereiche sind in den Unteransprüchen beschrieben.Particularly advantageous alloy ranges are described in the subclaims.

Mit den erfindungsgemäßen Legierungen lassen sich wesentlich schnellere Schaltzeiten bei magnetischen Schaltkreisen erreichen sowohl beim Auf- als auch beim Entmagnetisieren; und beim Einsatz von Erregerkreisen von induktiven Bauelementen gestattet es die Verwendung der beanspruchten Legierungen, diese mit wesentlich höheren Frequenzen des Erregerstroms zu betreiben.With the alloys according to the invention, significantly faster switching times in magnetic circuits can be achieved both when magnetizing and when demagnetizing; and when using excitation circuits of inductive components, the use of the claimed alloys allows them to be operated at substantially higher frequencies of the excitation current.

Beispielsweise wurden folgende Legierungszusammensetzungen hergestellt und an diesen Legierungen die in der nachstehenden Tabelle eingetragenen Meßwerte ermittelt: Tabelle Co % V % Mo % Cr % B(160) T Hc A/cm Rho µOhmm 10 3 3 0 2,03 1,74 0,511 15 0 2,5 3,5 2,01 2,57 0,531 15 0 1 4 2,02 2,82 0,532 15 0 3 3 2,02 2,60 0,499 15 0 2 2,5 2,06 2,92 0,469 15 0 2 4,5 1,98 2,43 0,587 15 3 3 0 2,02 1,74 0,531 15 2 2,5 0 2,07 2,45 0,450 15 3,5 1,5 0 2,03 2,14 0,503 15 4,5 2 0 1,98 1,39 0,600 15 2 4,5 0 2,03 1,92 0,442 15 3,5 4,5 0 2,01 0,94 0,578 15 2 2,5 2 2,01 1,96 0,568 20 2 2 2 2,02 2,51 0,605 20 3 3 0 2,02 2,24 0,543 30 2 0 0 2,33 2,64 0,324 30 0 2 0 2,28 7,10 0,210 30 0 2 2 1,92 3,25 0,468 25 4 0 0 2,16 2,10 0,483 25 2 2 0 2,16 2,89 0,431 20 2 0 0 2,10 1,83 0,291 20 0 2 0 2,17 2,56 0,298 20 2 0 2 2,06 1,04 0,511 15 4 0 0 2,06 1,09 0,397 Hierin bedeuten:
% = Gew.-% des Elementes,
B(160)[T] = Induktion in Tesla bei Feldstärke von 160 A/cm
Hc [A/cm] = Koerzitivfeldstärke
Rho [µOhm*m] = spezifischer Widerstand For example, the following alloy compositions were produced and the measured values entered in the table below were determined on these alloys: table Co% V% Mo% Cr% B (160) T Hc A / cm Rho µOhmm 10th 3rd 3rd 0 2.03 1.74 0.511 15 0 2.5 3.5 2.01 2.57 0.531 15 0 1 4th 2.02 2.82 0.532 15 0 3rd 3rd 2.02 2.60 0.499 15 0 2nd 2.5 2.06 2.92 0.469 15 0 2nd 4.5 1.98 2.43 0.587 15 3rd 3rd 0 2.02 1.74 0.531 15 2nd 2.5 0 2.07 2.45 0.450 15 3.5 1.5 0 2.03 2.14 0.503 15 4.5 2nd 0 1.98 1.39 0.600 15 2nd 4.5 0 2.03 1.92 0.442 15 3.5 4.5 0 2.01 0.94 0.578 15 2nd 2.5 2nd 2.01 1.96 0.568 20th 2nd 2nd 2nd 2.02 2.51 0.605 20th 3rd 3rd 0 2.02 2.24 0.543 30th 2nd 0 0 2.33 2.64 0.324 30th 0 2nd 0 2.28 7.10 0.210 30th 0 2nd 2nd 1.92 3.25 0.468 25th 4th 0 0 2.16 2.10 0.483 25th 2nd 2nd 0 2.16 2.89 0.431 20th 2nd 0 0 2.10 1.83 0.291 20th 0 2nd 0 2.17 2.56 0.298 20th 2nd 0 2nd 2.06 1.04 0.511 15 4th 0 0 2.06 1.09 0.397 Here mean:
% =% By weight of the element,
B (160) [T] = induction in Tesla with a field strength of 160 A / cm
Hc [A / cm] = coercive field strength
Rho [µOhm * m] = specific resistance

Claims (4)

Verwendung einer weichmagnetischen Legierung auf Eisenbasis mit Kobalt zum Einsatz in magnetischen Schalt- oder Erregerkreisen, deren Koerzitivfeldstärke <= 3,2 A/cm und deren Sättigungsflußdichte > 1,9 Tesla beträgt, dadurch gekennzeichnet, daß die Legierung 6 - 30 Gew.-% Kobalt, 3 - 8 Gew.-% eines oder mehrerer der Elemente Chrom, Molybdän, Vanadium, Wolfram und als Rest Eisen, einschließlich herstellungsbedingter Verunreinigungen enthält.Use of a soft magnetic iron-based alloy with cobalt for use in magnetic circuits or excitation circuits whose coercive field strength is <= 3.2 A / cm and whose saturation flux density is> 1.9 Tesla, characterized in that the alloy is 6-30% by weight. Cobalt, 3 - 8 wt .-% of one or more of the elements chromium, molybdenum, vanadium, tungsten and the balance iron, including manufacturing-related impurities. Weichmagnetische Legierung nach Anspruch 1, dadurch gekennzeichnet, daß der Kobalt-Anteil der Legierung im Bereich von 10 bis 20 Gew.-% liegt.Soft magnetic alloy according to Claim 1, characterized in that the cobalt content of the alloy is in the range from 10 to 20% by weight. Weichmagnetische Legierung nach den Ansprüchen 1 oder 2, dadurch gekennzeichnet, daß der Anteil der Elemente Chrom, Molybdän, Vanadium, Wolfram zwischen 4 und 8 Gew.-% liegt.Soft magnetic alloy according to claims 1 or 2, characterized in that the proportion of the elements chromium, molybdenum, vanadium, tungsten is between 4 and 8% by weight. Weichmagnetische Legierung nach den Ansprüchen 1 bis 3, dadurch gekennzeichnet, daß der Anteil der Elemente Chrom, Molybdän, Vanadium und Wolfram im Bereich von 5 bis 8 Gew.-% liegt, so daS sich ein spezifischer Widerstand > 0,5 µOhm*m und eine Induktion von > 1,9 Tesla bei einer Feldstärke von 160 A/cm ergibt.Soft magnetic alloy according to Claims 1 to 3, characterized in that the proportion of the elements chromium, molybdenum, vanadium and tungsten is in the range from 5 to 8% by weight, so that there is a specific resistance> 0.5 µOhm * m and an induction of> 1.9 Tesla with a field strength of 160 A / cm results.
EP95117334A 1994-11-29 1995-11-03 Iron based cobalt containing soft magnetic alloy for commutation and excitation of circuits Withdrawn EP0715320A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4442420 1994-11-29
DE19944442420 DE4442420A1 (en) 1994-11-29 1994-11-29 Soft magnetic iron-based alloy with cobalt for magnetic circuits or excitation circuits

Publications (1)

Publication Number Publication Date
EP0715320A1 true EP0715320A1 (en) 1996-06-05

Family

ID=6534429

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95117334A Withdrawn EP0715320A1 (en) 1994-11-29 1995-11-03 Iron based cobalt containing soft magnetic alloy for commutation and excitation of circuits

Country Status (2)

Country Link
EP (1) EP0715320A1 (en)
DE (1) DE4442420A1 (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001000895A1 (en) * 1999-06-23 2001-01-04 Vacuumschmelze Gmbh Iron-cobalt alloy with a low coercitive field intensity and method for the production of semi-finished products made of an iron-cobalt alloy
WO2001086665A1 (en) * 2000-05-12 2001-11-15 Imphy Ugine Precision Iron-cobalt alloy, in particular for electromagnetic actuator mobile core and method for making same
EP1217087A1 (en) * 2000-12-20 2002-06-26 Vacuumschmelze GmbH Iron-cobalt alloy with a low coercitive field intensity and method for the production of semi-finished products made of an iron-cobalt alloy
US6600887B2 (en) * 1998-08-06 2003-07-29 Canon Kabushiki Kaisha Image forming apparatus featuring a slide friction sheet for dispersing contamination from a charged rotary member
EP1918407A1 (en) * 2006-10-30 2008-05-07 Vacuumschmelze GmbH & Co. KG Iron-cobalt based soft magnetic alloy and method for its manufacture
US20110018658A1 (en) * 2008-01-22 2011-01-27 Arcelormittal-Stainless & Nickel Alloys Fe-co alloy for highly dynamic electromagnetic actuator
US7964043B2 (en) 2001-07-13 2011-06-21 Vacuumschmelze Gmbh & Co. Kg Method for producing nanocrystalline magnet cores, and device for carrying out said method
US8012270B2 (en) 2007-07-27 2011-09-06 Vacuumschmelze Gmbh & Co. Kg Soft magnetic iron/cobalt/chromium-based alloy and process for manufacturing it
US8887376B2 (en) 2005-07-20 2014-11-18 Vacuumschmelze Gmbh & Co. Kg Method for production of a soft-magnetic core having CoFe or CoFeV laminations and generator or motor comprising such a core
US9057115B2 (en) 2007-07-27 2015-06-16 Vacuumschmelze Gmbh & Co. Kg Soft magnetic iron-cobalt-based alloy and process for manufacturing it

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007035773B9 (en) 2007-07-27 2013-03-14 Vacuumschmelze Gmbh & Co. Kg Soft magnetic alloy based on iron-cobalt-chromium and process for its preparation

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61253348A (en) * 1985-05-04 1986-11-11 Daido Steel Co Ltd Soft magnetic material
JPS6293342A (en) * 1985-10-17 1987-04-28 Daido Steel Co Ltd Soft magnetic material

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61253348A (en) * 1985-05-04 1986-11-11 Daido Steel Co Ltd Soft magnetic material
JPS6293342A (en) * 1985-10-17 1987-04-28 Daido Steel Co Ltd Soft magnetic material

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 011, no. 106 (C - 414) 3 April 1987 (1987-04-03) *
PATENT ABSTRACTS OF JAPAN vol. 011, no. 300 (C - 449) 29 September 1987 (1987-09-29) *

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6600887B2 (en) * 1998-08-06 2003-07-29 Canon Kabushiki Kaisha Image forming apparatus featuring a slide friction sheet for dispersing contamination from a charged rotary member
WO2001000895A1 (en) * 1999-06-23 2001-01-04 Vacuumschmelze Gmbh Iron-cobalt alloy with a low coercitive field intensity and method for the production of semi-finished products made of an iron-cobalt alloy
DE19928764B4 (en) * 1999-06-23 2005-03-17 Vacuumschmelze Gmbh Low coercivity iron-cobalt alloy and process for producing iron-cobalt alloy semi-finished product
US7819990B2 (en) 2000-05-12 2010-10-26 Imphy Ugine Precision Iron-cobalt alloy, in particular for the moving core of electromagnetic actuators
FR2808806A1 (en) * 2000-05-12 2001-11-16 Imphy Ugine Precision Iron-cobalt alloy used for electromagnetic actuator mobile core contains specified amounts of cobalt, silicon, aluminum, manganese and carbon
US7128790B2 (en) 2000-05-12 2006-10-31 Imphy Ugine Precision Iron-cobalt alloy, in particular for electromagnetic actuator mobile core and method for making same
WO2001086665A1 (en) * 2000-05-12 2001-11-15 Imphy Ugine Precision Iron-cobalt alloy, in particular for electromagnetic actuator mobile core and method for making same
EP1217087A1 (en) * 2000-12-20 2002-06-26 Vacuumschmelze GmbH Iron-cobalt alloy with a low coercitive field intensity and method for the production of semi-finished products made of an iron-cobalt alloy
US7964043B2 (en) 2001-07-13 2011-06-21 Vacuumschmelze Gmbh & Co. Kg Method for producing nanocrystalline magnet cores, and device for carrying out said method
US8887376B2 (en) 2005-07-20 2014-11-18 Vacuumschmelze Gmbh & Co. Kg Method for production of a soft-magnetic core having CoFe or CoFeV laminations and generator or motor comprising such a core
EP1918407A1 (en) * 2006-10-30 2008-05-07 Vacuumschmelze GmbH & Co. KG Iron-cobalt based soft magnetic alloy and method for its manufacture
US7909945B2 (en) 2006-10-30 2011-03-22 Vacuumschmelze Gmbh & Co. Kg Soft magnetic iron-cobalt-based alloy and method for its production
US8012270B2 (en) 2007-07-27 2011-09-06 Vacuumschmelze Gmbh & Co. Kg Soft magnetic iron/cobalt/chromium-based alloy and process for manufacturing it
US9057115B2 (en) 2007-07-27 2015-06-16 Vacuumschmelze Gmbh & Co. Kg Soft magnetic iron-cobalt-based alloy and process for manufacturing it
US20110018658A1 (en) * 2008-01-22 2011-01-27 Arcelormittal-Stainless & Nickel Alloys Fe-co alloy for highly dynamic electromagnetic actuator
US8951364B2 (en) * 2008-01-22 2015-02-10 Aperam Alloys Imphy Highly dynamic electromagnetic actuator comprising a movable core made from an Fe-Co alloy

Also Published As

Publication number Publication date
DE4442420A1 (en) 1996-05-30

Similar Documents

Publication Publication Date Title
DE69721671T2 (en) Stepper motor for a clockwork with stand which is made of a soft magnetic, corrosion-resistant alloy and alloy therefor
DE4021781C2 (en) Ferritic alloy
DE2659820C2 (en) Process for the production of the laminated platelets of the core of a magnetic head
DE2839626C2 (en)
EP1051714B1 (en) Soft magnetic nickel-iron alloy with low coercive field strength, high permeability and improved resistance to corrosion
DE2835389A1 (en) MAGNETIC ALLOY
EP0715320A1 (en) Iron based cobalt containing soft magnetic alloy for commutation and excitation of circuits
EP0097737A1 (en) Powder metallurgy process for producing parts having high strength and hardness from Si-Mn or Si-Mn-C alloyed steel
EP1918407A1 (en) Iron-cobalt based soft magnetic alloy and method for its manufacture
JPS61253348A (en) Soft magnetic material
AT394581B (en) METHOD FOR PRODUCING A NI-FE ALLOY SHEET WITH EXCELLENT DC-MAGNETIC AND AC-MAGNETIC PROPERTIES
DE102018118207A1 (en) Samarium-containing soft magnetic alloys
DE3619659C2 (en) Use of a glass-like alloy based on Fe
EP0794539B1 (en) Toroidal inductance for radio interference suppression of phase-controllable semiconductor circuits
DE102011001488B4 (en) Use of a soft magnetic alloy in a rotor or stator of an electric motor
DE3202600A1 (en) Inductive voltage or current limiter
DE3841748A1 (en) ALLOY WITH HIGHLY SATURATED MAGNETIC FLOW DENSITY
DE3119927C2 (en)
DE19628139C1 (en) Use of a corrosion-resistant soft magnetic iron-nickel-chrome alloy for yokes and armatures of electromagnetic relays
DE2432335B2 (en) Material for electrical contacts
DE2913071A1 (en) IRON-CHROMIUM-COBALT-BASED MAGNETIC ALLOY WITH SPINODAL DECOMPOSITION
EP0329704B1 (en) Near-zero magnetostrictive glassy metal alloys for high frequency applications
DE4030791A1 (en) Alloy with enhanced saturation flux density - contg. cobalt, germanium, aluminium and iron used for magnetic video items, has outstanding magnetic properties
DE19612556C2 (en) Use of a soft magnetic nickel-iron alloy
DE4015683C2 (en) Process for the production of high or low coercive permanent magnets

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE FR GB IT

17P Request for examination filed

Effective date: 19960706

17Q First examination report despatched

Effective date: 19981001

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19990413