EP0185439B1 - Dauermagnetlegierung - Google Patents

Dauermagnetlegierung Download PDF

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Publication number
EP0185439B1
EP0185439B1 EP85306148A EP85306148A EP0185439B1 EP 0185439 B1 EP0185439 B1 EP 0185439B1 EP 85306148 A EP85306148 A EP 85306148A EP 85306148 A EP85306148 A EP 85306148A EP 0185439 B1 EP0185439 B1 EP 0185439B1
Authority
EP
European Patent Office
Prior art keywords
dysprosium
alloy
neodymium
coercive force
permanent magnet
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.)
Expired
Application number
EP85306148A
Other languages
English (en)
French (fr)
Other versions
EP0185439A1 (de
Inventor
Kalathur S.V.L. Narasimham
Bao-Min Ma
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.)
Crucible Materials Corp
Original Assignee
Crucible Materials Corp
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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=24728160&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0185439(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Crucible Materials Corp filed Critical Crucible Materials Corp
Priority to AT85306148T priority Critical patent/ATE43932T1/de
Publication of EP0185439A1 publication Critical patent/EP0185439A1/de
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Publication of EP0185439B1 publication Critical patent/EP0185439B1/de
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    • 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
    • H01F1/053—Alloys characterised by their composition containing rare earth metals
    • H01F1/055—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
    • H01F1/057—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
    • 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

Definitions

  • This invention relates to permanent magnet alloys.
  • Permanent magnet alloys used in the production of permanent magnets for use in electric motors, and particularly electric motors used in household appliances and the like, are required to have good resistance to demagnetization at elevated temperatures for efficient motor operation.
  • the temperatures involved in these motor applications are typically within the range of 125 to 150°C.
  • To achieve high resistance to demagnetization good remanence (B r ) and coercive force (He;) values are required within this temperature range. It is further desired in applications such as permanent magnets used in electric motors for household appliance applications that the alloy of the magnet be relatively low cost.
  • a more specific object of the invention is to provide a permanent magnet alloy of low cost having a good combination of both remanence and coercive force within the temperature range of 125 to 150°C which increase in coercive force is achieved by an improved crystal anisotropy without decreasing remanence to below acceptable levels.
  • the permanent magnet alloy of the invention consists of, in weight percent, 1 to 10 dysprosium, 20 to 37 neodymium, with the total dysprosium and neodymium content being within the range of 30 to 38, 0.8 to 1.33 boron and balance iron and impurities usual in metal alloys.
  • the dysprosium content is from 2.5 to 6.5% and more preferred from 3 to 6%.
  • the single figure of the drawing is a graph illustrating the effect of the dysprosium content of a magnet alloy on the coercive force.
  • the following specific examples of the invention show with neodymium, iron, boron magnets the temperature effect on loss of coercive force. Also, the examples demonstrate that coercive force in magnet alloys of this type are increased by the addition of dysprosium as a rare earth element. They also show that increased dysprosium above the limits of the invention decreases remanence values to below acceptable levels. Consequently, it is critical with regard to achieving a combination of good remanence and coercive force within the required temperature range of 125 to 150°C to have the rare earth element content of the alloy comprise a combination of dysprosium and neodymium.
  • Dysprosium was added to the NdFeB alloy while maintaining the total rare earth content as 35.6% and 37.1%.
  • Tables II and III list the magnetic properties of the magnets.
  • dysprosium addition in combination with neodymium permits utilization of these magnets at elevated temperatures. Increasing the dysprosium further results in a decrease in B r which makes the magnets not have enough flux at the required temperature for the intended applications.
  • Table V shows the magnetic properties of a 10% Dy containing magnet.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Power Engineering (AREA)
  • Hard Magnetic Materials (AREA)

Claims (3)

1. Dauermagnetlegierung des Seltenerdelement-Fe-B-Typs, dadurch gekennzeichnet, daß sie aus 1 bis 10 Gew.-% Dysprosium, 20 bis 37 Gew.-% Neodym, wobei der gesamte Dysprosium- und Neodymgehalt in dem Bereich von 30 bis 38 Gew.- % liegt, 0,8 bis 1,33 Gew.-% Bor und dem Rest Eisen und bei Metallegierungen üblichen Verunreinigungen besteht, und daß sie eine gute Koezitivkraft bei einer erhöhten Temperatur besitzt.
2. Legierung nach Anspruch 1, bei der Dysprosium in einer Menge von 2,5 bis 6,5 Gew.-% vorliegt.
3. Legierung nach Anspruch 1 oder 2, bei der Dysprosium in einer Menge von 3 bis 6 Gew.-% vorliegt.
EP85306148A 1984-12-10 1985-08-30 Dauermagnetlegierung Expired EP0185439B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85306148T ATE43932T1 (de) 1984-12-10 1985-08-30 Dauermagnetlegierung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US67973984A 1984-12-10 1984-12-10
US679739 1984-12-10

Publications (2)

Publication Number Publication Date
EP0185439A1 EP0185439A1 (de) 1986-06-25
EP0185439B1 true EP0185439B1 (de) 1989-06-07

Family

ID=24728160

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85306148A Expired EP0185439B1 (de) 1984-12-10 1985-08-30 Dauermagnetlegierung

Country Status (5)

Country Link
EP (1) EP0185439B1 (de)
JP (1) JPS61139641A (de)
AT (1) ATE43932T1 (de)
CA (1) CA1273231A (de)
DE (1) DE3570942D1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4837109A (en) * 1986-07-21 1989-06-06 Hitachi Metals, Ltd. Method of producing neodymium-iron-boron permanent magnet
EP0277416A3 (de) * 1987-02-04 1990-05-16 Crucible Materials Corporation Permanente Magnetlegierung für Anwendungen bei höherer Temperatur
JP2001332410A (ja) * 2000-05-22 2001-11-30 Seiko Epson Corp 磁石粉末、磁石粉末の製造方法およびボンド磁石

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0108474A2 (de) * 1982-09-03 1984-05-16 General Motors Corporation RE-TM-B Legierungen, deren Herstellung und permanent Magnete die solche Legierungen enthalten

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES8504404A3 (es) * 1981-06-16 1985-04-16 Proyectos Magneticos S A Proma Procedimiento para la fabricacion de una aleacion que tiene propiedades magneticas permanentes a temperatura ambiente
JPS59163802A (ja) * 1983-03-08 1984-09-14 Sumitomo Special Metals Co Ltd 永久磁石材料
JPS59204209A (ja) * 1983-05-06 1984-11-19 Sumitomo Special Metals Co Ltd 等方性永久磁石材料
JPS59215460A (ja) * 1983-05-21 1984-12-05 Sumitomo Special Metals Co Ltd 永久磁石材料の製造方法

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0108474A2 (de) * 1982-09-03 1984-05-16 General Motors Corporation RE-TM-B Legierungen, deren Herstellung und permanent Magnete die solche Legierungen enthalten

Also Published As

Publication number Publication date
DE3570942D1 (en) 1989-07-13
JPS61139641A (ja) 1986-06-26
CA1273231A (en) 1990-08-28
ATE43932T1 (de) 1989-06-15
EP0185439A1 (de) 1986-06-25

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