EP0003466B1 - Procédé de traitement thermique des alliages Fe-Co-Cr pour aimants permanents - Google Patents

Procédé de traitement thermique des alliages Fe-Co-Cr pour aimants permanents Download PDF

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Publication number
EP0003466B1
EP0003466B1 EP79420003A EP79420003A EP0003466B1 EP 0003466 B1 EP0003466 B1 EP 0003466B1 EP 79420003 A EP79420003 A EP 79420003A EP 79420003 A EP79420003 A EP 79420003A EP 0003466 B1 EP0003466 B1 EP 0003466B1
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EP
European Patent Office
Prior art keywords
minutes
stage
annealing
temperature
treatment
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Expired
Application number
EP79420003A
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German (de)
English (en)
French (fr)
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EP0003466A1 (fr
Inventor
Claude Bronner
Daniel Jullien
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.)
Aimants Ugimac SA
Ugimag SA
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Aimants Ugimac SA
Ugimag SA
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Application filed by Aimants Ugimac SA, Ugimag SA filed Critical Aimants Ugimac SA
Publication of EP0003466A1 publication Critical patent/EP0003466A1/fr
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    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/002—Heat treatment of ferrous alloys containing Cr

Definitions

  • the present invention relates to a process for heat treatment of Fe-Co-Cr alloys intended for the manufacture of permanent magnets as well as the magnets produced by this process.
  • These alloys have for composition (by weight): optionally one or more of the elements AI, Nb, Ta, W, Mo, V, Ti, Si, Cu in a total amount of less than 10%, the rest being iron.
  • French Patent No. 2,149,076 describes certain alloys of this type as well as their heat treatments.
  • a first form is molded and subjected to a high temperature homogenization treatment between 1200 and 1400 ° C for more than 10 minutes, followed by rapid quenching to room temperature.
  • the molded body can undergo, without particular difficulty, various shaping operations such as rolling, drilling, machining, etc. to bring it to a shape close to the final shape.
  • the body is subjected to an isothermal annealing treatment in a magnetic field, at a temperature between 580 and 650 ° C (preferably 600 to 640 ° C) for a period of 10 minutes to 2 hours, but preferably from 1 'order of 30 minutes.
  • the part is subjected to one or more tempers at temperatures between 530 and 650 ° C for 1 to 9 h, these tempers can be done at decreasing stepped temperatures.
  • these different incomes tend to decrease the rectangularity of the hysteresis cycle measured by the ratio q between the specific energy (BH) max and the product Br Hc of the residual induction by the coercive field.
  • the object of the present invention is to avoid these drawbacks and to allow the manufacture of anisotropic permanent magnets of the Fe-Cr-Co type having a coefficient il of rectangularity of the hysteresis curve constant during the incomes and whose specific energy can exceed 40 kJ / m 3 (5.10 8 Gaus-Oersteds) without additional wrought operation and, therefore, without risk of rupture.
  • the duration of the first stage is short enough to avoid precipitation of the fragile u phase in the alloy.
  • the holding temperature during this first step is preferably between 640 and 660 ° C.
  • the tempering treatment is preferably carried out in three stages of increasing duration at decreasing staged temperatures of approximately 30 ° C. These steps can be linked or separated by returns to room temperature.
  • a magnetic field is applied during the first annealing step, the curvature of the field lines of which is appropriate for the intended application of the magnet.
  • the second annealing step can be done with or without the action of a magnetic field.
  • the annealing treatment does not involve any action of a magnetic field.
  • the alloys used in the process according to the invention can be obtained in various ways, for example by melting the constituent elements in the pure state or in the pre-alloyed state, or by sintering pluvululent mixtures of the constituent elements or alloys of these elements.
  • the process can also be applied to alloys which have been given a privileged crystal structure by known means (thermal gradient, zone fusion, etc.).
  • the invention will be illustrated by the following exemplary embodiments and by the single figure which represents a diagram of the heat treatment of an alloy according to the invention, in order to obtain an anisotropic magnet, the hatched part of the curve representing the area of time and temperature where it is necessary to apply a magnetic field.
  • the treatment A according to the invention notably improves the magnetic properties of an isotropic magnet, in particular as regards the recatangularity of the hysteresis curve.
  • the weakly alloyed compositions (in Co and Cr) examples 3 and 4 have values of BHmax and of ⁇ which are much higher than those obtained with the loaded alloys (example 1) representative of the state of the art, and that the weakest alloy (example 4) itself offers magnetic characteristics greater than or equivalent to those of the alloy of intermediate composition (example 3).

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Hard Magnetic Materials (AREA)
  • Heat Treatment Of Nonferrous Metals Or Alloys (AREA)
EP79420003A 1978-01-19 1979-01-11 Procédé de traitement thermique des alliages Fe-Co-Cr pour aimants permanents Expired EP0003466B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7802104 1978-01-19
FR7802104A FR2415145A1 (fr) 1978-01-19 1978-01-19 Procede de traitement thermique des alliages fe-co-cr pour aimants permanents

Publications (2)

Publication Number Publication Date
EP0003466A1 EP0003466A1 (fr) 1979-08-08
EP0003466B1 true EP0003466B1 (fr) 1980-07-23

Family

ID=9203819

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79420003A Expired EP0003466B1 (fr) 1978-01-19 1979-01-11 Procédé de traitement thermique des alliages Fe-Co-Cr pour aimants permanents

Country Status (13)

Country Link
US (1) US4246049A (enrdf_load_stackoverflow)
EP (1) EP0003466B1 (enrdf_load_stackoverflow)
JP (1) JPS5856731B2 (enrdf_load_stackoverflow)
AT (1) AT373629B (enrdf_load_stackoverflow)
BE (1) BE873557A (enrdf_load_stackoverflow)
BR (1) BR7900316A (enrdf_load_stackoverflow)
CA (1) CA1132886A (enrdf_load_stackoverflow)
CH (1) CH635617A5 (enrdf_load_stackoverflow)
DE (1) DE2960005D1 (enrdf_load_stackoverflow)
ES (1) ES476970A1 (enrdf_load_stackoverflow)
FR (1) FR2415145A1 (enrdf_load_stackoverflow)
IN (1) IN151185B (enrdf_load_stackoverflow)
IT (1) IT1110740B (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19611461A1 (de) * 1996-03-22 1997-09-25 Dresden Ev Inst Festkoerper Verwendung einer Eisen-Chrom-Kobalt-Basis-Legierung

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1981000643A1 (en) * 1979-08-24 1981-03-05 Western Electric Co Magnetic alloys containing fe-cr-co
JPS57149456A (en) * 1981-03-10 1982-09-16 Sumitomo Special Metals Co Ltd Dendritic fe-cr-co magnet alloy
US4601876A (en) * 1981-08-31 1986-07-22 Sumitomo Special Metals Co., Ltd. Sintered Fe-Cr-Co type magnetic alloy and method for producing article made thereof
JPS59159929A (ja) * 1983-02-28 1984-09-10 Nippon Gakki Seizo Kk 磁石材料の製法
DE3334369C1 (de) * 1983-09-23 1984-07-12 Thyssen Edelstahlwerke AG, 4000 Düsseldorf Dauermagnetlegierung
GB2163778B (en) * 1984-08-30 1988-11-09 Sokkisha Magnetic medium used with magnetic scale
JPS6187825A (ja) * 1984-10-05 1986-05-06 Hitachi Metals Ltd 永久磁石材料の製造方法
JP2681048B2 (ja) * 1985-07-04 1997-11-19 株式会社ソキア 磁気スケール材
KR910009974B1 (ko) * 1988-01-14 1991-12-07 알프스 덴기 가부시기가이샤 고포화 자속밀도 합금
US4920326A (en) * 1989-01-26 1990-04-24 Eastman Kodak Company Method of magnetizing high energy rare earth alloy magnets
RU2557852C1 (ru) * 2014-01-29 2015-07-27 Федеральное государственное бюджетное учреждение науки Институт металлургии и материаловедения им. А.А. Байкова Российской академии наук (ИМЕТ РАН) Способ термической обработки магнитотвердых сплавов системы железо-хром-кобальт с содержанием кобальта 8 вес.%
CN104073736A (zh) * 2014-07-02 2014-10-01 钢铁研究总院 10Ni10Co高韧性二次硬化超高强钢及制备方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2298225A (en) * 1939-12-30 1942-10-06 Bell Telephone Labor Inc Permanent magnet material and production thereof
US3588764A (en) * 1969-11-26 1971-06-28 Bell Telephone Labor Inc Magnetic alloy and devices utilizing same
GB1367174A (en) * 1970-12-28 1974-09-18 Inoue Japax Res Magnetic-meterials
FR2149076A5 (en) * 1971-06-30 1973-03-23 Inoue Japax Res Magnetic alloy - contg silicon iron, cobalt, chromium molybdenum and tunsten has improved magnetic properties
JPS5536059B2 (enrdf_load_stackoverflow) * 1974-05-02 1980-09-18
US3982972A (en) * 1975-03-21 1976-09-28 Hitachi Metals, Ltd. Semihard magnetic alloy and a process for the production thereof
US4008105A (en) * 1975-04-22 1977-02-15 Warabi Special Steel Co., Ltd. Magnetic materials

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19611461A1 (de) * 1996-03-22 1997-09-25 Dresden Ev Inst Festkoerper Verwendung einer Eisen-Chrom-Kobalt-Basis-Legierung
DE19611461C2 (de) * 1996-03-22 1999-05-12 Dresden Ev Inst Festkoerper Verwendung einer Eisen-Chrom-Kobalt-Basis-Legierung

Also Published As

Publication number Publication date
DE2960005D1 (en) 1980-11-13
BE873557A (fr) 1979-07-18
ES476970A1 (es) 1979-06-16
US4246049A (en) 1981-01-20
ATA35579A (de) 1983-06-15
BR7900316A (pt) 1979-08-14
FR2415145B1 (enrdf_load_stackoverflow) 1980-08-01
IT7919384A0 (it) 1979-01-17
EP0003466A1 (fr) 1979-08-08
CH635617A5 (fr) 1983-04-15
IN151185B (enrdf_load_stackoverflow) 1983-03-05
JPS54109021A (en) 1979-08-27
AT373629B (de) 1984-02-10
JPS5856731B2 (ja) 1983-12-16
CA1132886A (fr) 1982-10-05
IT1110740B (it) 1986-01-06
FR2415145A1 (fr) 1979-08-17

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