EP0784100A1 - Eisen-Kobalt Legierung, Herstellungsverfahren für Band aus dieser Legierung, und die Erzeugnisse dieses Verfahren - Google Patents

Eisen-Kobalt Legierung, Herstellungsverfahren für Band aus dieser Legierung, und die Erzeugnisse dieses Verfahren Download PDF

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Publication number
EP0784100A1
EP0784100A1 EP97400024A EP97400024A EP0784100A1 EP 0784100 A1 EP0784100 A1 EP 0784100A1 EP 97400024 A EP97400024 A EP 97400024A EP 97400024 A EP97400024 A EP 97400024A EP 0784100 A1 EP0784100 A1 EP 0784100A1
Authority
EP
European Patent Office
Prior art keywords
strip
alloy
iron
heat treatment
alloy according
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.)
Granted
Application number
EP97400024A
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English (en)
French (fr)
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EP0784100B1 (de
Inventor
Georges Couderchon
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.)
Aperam Stainless Precision SAS
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Imphy SA
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Publication date
Application filed by Imphy SA filed Critical Imphy SA
Publication of EP0784100A1 publication Critical patent/EP0784100A1/de
Application granted granted Critical
Publication of EP0784100B1 publication Critical patent/EP0784100B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • C22C38/10—Ferrous alloys, e.g. steel alloys containing cobalt

Definitions

  • the present invention relates to an Iron-Cobalt alloy for the manufacture of magnetic circuits for electrotechnical machines.
  • electrotechnical machines such as electric motors, transformers or relays include magnetic circuits made up of stacks of parts cut from alloy strips whose magnetic properties are adapted. These properties must be all the better as the machines have a high specific energy, which is the case, for example, for machines on board vehicles such as planes or high-speed trains. Indeed, for these applications it is necessary to reduce the weight of the equipment as much as possible, which requires an increase in the specific energy, that is to say the power per unit of mass.
  • the magnetic circuits of machines with high specific energy are often made of an Iron-Cobalt alloy whose chemical composition includes, by weight, about 50% of cobalt and 2% of vanadium, the rest being iron and impurities.
  • these alloys have several drawbacks because they all exhibit an ⁇ / ⁇ phase transformation which very considerably limits the possibilities of action on the magnetic properties by heat treatment.
  • these alloys generally have too low an electrical resistivity and are too expensive.
  • the object of the present invention is to remedy these drawbacks by proposing an alloy of the Iron-Cobalt type having magnetic properties close to those of known alloys, but with a lower cobalt content, so as to be less expensive than the alloys. existing, and can be cold rolled.
  • the subject of the invention is an Iron-Cobalt alloy, the chemical composition of which comprises by weight: 5% ⁇ Co ⁇ 40% 0% ⁇ If ⁇ 4% 0.2% ⁇ Al ⁇ 5% 0.5% ⁇ Si + Al ⁇ 5% the remainder being iron and impurities resulting from processing.
  • the impurities resulting from the production can be, in particular, elements such as chromium, titanium, germanium, vanadium and molybdenum, and elements such as carbon, oxygen, nitrogen, sulfur and phosphorus.
  • the impurities resulting from the production which are carbon, oxygen, nitrogen, sulfur and phosphorus, have contents lower than the following values: C ⁇ 0.03% O ⁇ 0.005% N ⁇ 0.003% S ⁇ 0.003% P ⁇ 0.003% and the sum of the contents of chromium, titanium, germanium, vanadium and molybdenum must be less than 0.5%.
  • the chemical composition verifies one or more of the following relationships: 10% ⁇ Co ⁇ 35%, Si ⁇ 2.5% or Al ⁇ 1.5% or Si + Al ⁇ 1.5%.
  • the coating with an insulating layer can be obtained by covering the strip, that is, after the heat treatment, with at least one layer of varnish mineral or organic, or, before the heat treatment, at least one layer of magnesium methylate.
  • the coating with an insulating layer can be obtained by applying a milk of magnesia to the strip, before the heat treatment.
  • the invention finally relates to a strip of an alloy according to the invention, coated with at least one electrically insulating layer, preferably having a cubic texture (100) [001] or a texture (110) [001], thus than its use for the manufacture of a magnetic circuit of an electrotechnical machine.
  • the inventors have found in a new way that by adding aluminum to an Fer-Cobalt alloy possibly containing silicon, the resistivity of the alloy is appreciably increased without too much lowering the saturation magnetization, and, by choosing suitably the content of this element, taking into account the possible silicon content, the ⁇ / ⁇ phase transformation could disappear while obtaining a material sufficiently ductile to be suitable for cold rolling. This makes it possible to obtain a strip whose magnetic properties can be improved by heat treatment and by obtaining a favorable texture.
  • the impurities resulting from the preparation are, in particular, elements such as chromium, titanium, germanium, vanadium and molybdenum which can be tolerated provided that the sum of their contents remains less than 0.5%.
  • the impurities are also elements such as carbon, oxygen, nitrogen, sulfur and phosphorus, the contents of which must be as low as possible and, preferably, such as: C ⁇ 0.03%, O ⁇ 0.005%, N ⁇ 0.003%, S ⁇ 0.003%, P ⁇ 0.003%.
  • the alloy can be produced in a vacuum oven or in an arc oven followed by treatment in a vacuum bag and then cast in the form of a semi-finished product.
  • the alloy can be remelted under vacuum or under electroconductive slag.
  • the alloy is cast in the form of a reflow electrode which is remelted under vacuum or under electroconductive slag to obtain the semi-finished product.
  • the semi-finished product is placed still hot in a reheating oven to be brought to the rolling temperature, then hot rolled to obtain a hot strip of thickness between approximately 1 mm and approximately 6 mm.
  • the hot strip is then pickled then, optionally, stretched by heating between 200 ° C and 600 ° C and finally, cold rolled (or warm when the strip is stretched) in several passes with, possibly intermediate annealing between 700 ° C and 1100 ° C, to obtain a cold strip with a thickness generally between 0.05 mm and 0.5 mm.
  • the succession of cold rolling and intermediate annealing makes it possible to obtain a cubic texture (100) [001] or a texture (110) [001] very favorable for obtaining good magnetic properties.
  • intermediate annealing should preferably be carried out under an atmosphere of pure and dry hydrogen.
  • the cold strip is then subjected to a heat treatment by heating and maintaining the temperature between 850 ° C and 1200 ° C for a time between 1 hour and 10 hours and coated with at least one electrically insulating layer.
  • the heat treatment which is carried out under an atmosphere of pure and dry hydrogen, makes it possible to enlarge the grain, which improves the magnetic properties.
  • At least one electrically insulating layer may consist of a mineral or organic varnish deposited after the heat treatment, or of magnesium methylate deposited before the heat treatment.
  • At least one electrically insulating layer can be obtained by applying to the strip, before the heat treatment, a milk of magnesia. During the heat treatment, the silicon located on the surface of the strip reacts with magnesia to form an insulating glass.
  • the strips thus obtained can be cut to obtain parts which, after stacking, form magnetic circuits for transformers, electric motors, relays or any other electrotechnical machine.
  • alloys C to D were manufactured (chemical composition by weight in%): alloy Fe Co Yes Al VS NOT O S VS ball 15 - 1.54 0.016 0.0008 0.001 0.0005 D ball 15 - 2.4 0.027 0.0005 0.001 0.0005 E ball 15 - 3.1 0.011 0.0005 0.001 0.0005 F ball 15 0.98 1.55 0.011 0.0012 0.0013 0.0005
  • alloys were produced in a vacuum oven, hot rolled then cold rolled to obtain strips of 0.2 mm thick. The strips were subjected to a heat treatment under hydrogen.
  • the heat treatment conditions and the magnetic characteristics obtained were: alloy ⁇ ° C t (hours) ⁇ ( ⁇ . ⁇ .cm) B to 600Oe (G) Hc (Oe) VS 900 4 35 22100 0.5 VS 1050 4 35 22100 0.53 D 900 4 38 21200 0.53 D 1150 4 38 21200 0.4 E 900 4 40 21000 0.43 E 1150 4 40 21000 0.4 F 900 4 39.5 21500 0.4 F 1000 4 39.5 21500 0.32
  • alloys according to the invention have a higher resistivity, a lower coercive field and a magnetization comparable to that of alloy A.
  • the iron-cobalt alloys according to the prior art contain p) read from 15% of cobalt and the characteristics of the bands in these alloys are typically: Co% ⁇ ( ⁇ . ⁇ .cm) B to 600 Oe (G) Hc (Oe) 50 40 22500 1 25 22 22500 1.5
  • the alloys according to the invention have a comparable electrical resistivity, a substantially weaker coercive field and a fairly similar magnetization despite a very significantly lower cobalt content. These results show some of the advantages of the alloy according to the invention.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Soft Magnetic Materials (AREA)
  • Continuous Casting (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Heat Treatment Of Steel (AREA)
  • Manufacturing Of Steel Electrode Plates (AREA)
EP97400024A 1996-01-11 1997-01-08 Eisen-Kobalt Legierung, Herstellungsverfahren für Band aus dieser Legierung, und die Erzeugnisse dieses Verfahren Expired - Lifetime EP0784100B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9600232A FR2743572B1 (fr) 1996-01-11 1996-01-11 Alliage fer-cobalt, procede de fabrication d'une bande en alliage fer-cobalt et bande obtenue
FR9600232 1996-01-11

Publications (2)

Publication Number Publication Date
EP0784100A1 true EP0784100A1 (de) 1997-07-16
EP0784100B1 EP0784100B1 (de) 2001-03-28

Family

ID=9488022

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97400024A Expired - Lifetime EP0784100B1 (de) 1996-01-11 1997-01-08 Eisen-Kobalt Legierung, Herstellungsverfahren für Band aus dieser Legierung, und die Erzeugnisse dieses Verfahren

Country Status (6)

Country Link
US (1) US5919319A (de)
EP (1) EP0784100B1 (de)
JP (1) JPH09195010A (de)
AT (1) ATE200112T1 (de)
DE (1) DE69704381T2 (de)
FR (1) FR2743572B1 (de)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6855240B2 (en) * 2000-08-09 2005-02-15 Hitachi Global Storage Technologies Netherlands B.V. CoFe alloy film and process of making same
US20100201469A1 (en) * 2006-08-09 2010-08-12 General Electric Company Soft magnetic material and systems therewith
US20080035245A1 (en) * 2006-08-09 2008-02-14 Luana Emiliana Iorio Soft magnetic material and systems therewith
KR101376507B1 (ko) 2012-02-22 2014-03-21 포항공과대학교 산학협력단 Ｆｅ-Ｃｏ계 합금 판재의 집합조직 형성 방법 및 이를 이용하여 제조된 연자성 강판
CN105264100B (zh) 2013-06-07 2017-06-16 Vdm金属有限公司 制备金属箔的方法
WO2014194881A2 (de) * 2013-06-07 2014-12-11 VDM Metals GmbH Verfahren zur herstellung einer metallfolie
DE102014213794A1 (de) 2014-07-16 2016-01-21 Robert Bosch Gmbh Weichmagnetische Legierungszusammensetzung und Verfahren zum Herstellen einer solchen
US10454352B1 (en) 2016-05-02 2019-10-22 Williams International Co., L.L.C. Method of producing a laminated magnetic core
JP7746984B2 (ja) * 2020-03-10 2025-10-01 株式会社プロテリアル Ｆｅ－Ｃｏ系合金棒材の製造方法およびＦｅ－Ｃｏ系合金棒材
JP7641488B2 (ja) * 2020-07-08 2025-03-07 大同特殊鋼株式会社 軟磁性部材及びその製造方法、軟磁性部材用合金板材
EP3957757B1 (de) * 2020-08-18 2023-03-01 Vacuumschmelze GmbH & Co. KG Verfahren zur herstellung eines bandes und einer schichtung aus einer cofe-legierung
JP7736074B2 (ja) * 2021-08-30 2025-09-09 株式会社プロテリアル 被覆部材の製造方法および被覆部材
WO2023042279A1 (ja) * 2021-09-14 2023-03-23 株式会社プロテリアル Ｆｅ－Ｃｏ系合金棒材
WO2023042278A1 (ja) * 2021-09-14 2023-03-23 株式会社プロテリアル Ｆｅ－Ｃｏ系合金棒材
WO2024185627A1 (ja) * 2023-03-03 2024-09-12 株式会社プロテリアル Ｆｅ－Ｃｏ系合金基材およびその製造方法、Ｆｅ－Ｃｏ系合金被覆基材およびその製造方法、ならびに積層コア部材

Citations (3)

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Publication number Priority date Publication date Assignee Title
DE705516C (de) 1933-10-13 1941-05-02 Fried Krupp Akt Ges Herstellung von Dynamo- und Transformatorenblechen und aehnlich magnetisch beanspruchten Gegenstaenden
JPH0257608A (ja) * 1988-08-20 1990-02-27 Kawasaki Steel Corp 射出成形用Ｆｅ―Ｃｏ系合金微粉およびＦｅ―Ｃｏ系焼結磁性材料
JPH04259355A (ja) * 1991-02-14 1992-09-14 Hitachi Metal Precision Ltd 靭性、比抵抗および飽和磁束密度の高い鋳造用Ｆｅ−Ｃｏ系磁性合金

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US4059462A (en) * 1974-12-26 1977-11-22 The Foundation: The Research Institute Of Electric And Magnetic Alloys Niobium-iron rectangular hysteresis magnetic alloy
JP2615543B2 (ja) * 1985-05-04 1997-05-28 大同特殊鋼株式会社 軟質磁性材料
JPH0689366B2 (ja) * 1986-05-01 1994-11-09 株式会社神戸製鋼所 電磁クラツチ用磁性粉体
JPS63233507A (ja) * 1987-03-20 1988-09-29 Kobe Steel Ltd 電磁クラツチ用磁性粉体
JPH0633199A (ja) * 1992-07-16 1994-02-08 Hitachi Metal Precision Ltd プリンタヘッド用ヨークコア
US5425912A (en) * 1994-07-07 1995-06-20 Inco Alloys International, Inc. Low expansion superalloy with improved toughness

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE705516C (de) 1933-10-13 1941-05-02 Fried Krupp Akt Ges Herstellung von Dynamo- und Transformatorenblechen und aehnlich magnetisch beanspruchten Gegenstaenden
JPH0257608A (ja) * 1988-08-20 1990-02-27 Kawasaki Steel Corp 射出成形用Ｆｅ―Ｃｏ系合金微粉およびＦｅ―Ｃｏ系焼結磁性材料
JPH04259355A (ja) * 1991-02-14 1992-09-14 Hitachi Metal Precision Ltd 靭性、比抵抗および飽和磁束密度の高い鋳造用Ｆｅ−Ｃｏ系磁性合金

Non-Patent Citations (2)

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PATENT ABSTRACTS OF JAPAN vol. 14, no. 228 (M - 973) 15 May 1990 (1990-05-15) *
PATENT ABSTRACTS OF JAPAN vol. 17, no. 042 (C - 1020) 26 January 1993 (1993-01-26) *

Also Published As

Publication number Publication date
FR2743572A1 (fr) 1997-07-18
ATE200112T1 (de) 2001-04-15
US5919319A (en) 1999-07-06
EP0784100B1 (de) 2001-03-28
JPH09195010A (ja) 1997-07-29
DE69704381T2 (de) 2001-10-11
DE69704381D1 (de) 2001-05-03
FR2743572B1 (fr) 1998-02-13

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