EP0277416A2 - Alliage pour aimant permanent pour applications à haute température - Google Patents

Alliage pour aimant permanent pour applications à haute température Download PDF

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Publication number
EP0277416A2
EP0277416A2 EP87310200A EP87310200A EP0277416A2 EP 0277416 A2 EP0277416 A2 EP 0277416A2 EP 87310200 A EP87310200 A EP 87310200A EP 87310200 A EP87310200 A EP 87310200A EP 0277416 A2 EP0277416 A2 EP 0277416A2
Authority
EP
European Patent Office
Prior art keywords
rare earth
combination
earth elements
alloy according
atomic percent
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Withdrawn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
EP87310200A
Other languages
German (de)
English (en)
Other versions
EP0277416A3 (fr
Inventor
Bao-Min Ma
K.S.V.L. Narasimhan
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
Application filed by Crucible Materials Corp filed Critical Crucible Materials Corp
Publication of EP0277416A2 publication Critical patent/EP0277416A2/fr
Publication of EP0277416A3 publication Critical patent/EP0277416A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/032Magnets 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
    • H01F1/04Magnets 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
    • H01F1/047Alloys characterised by their composition
    • H01F1/053Alloys characterised by their composition containing rare earth metals
    • H01F1/055Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
    • H01F1/057Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B

Definitions

  • This invention relates to permanent magnet alloys.
  • permanent magnet alloys and par­ticularly permanent magnet alloys embodying one or more rare earth elements with a transition element iron and boron, for applications requiring permanent magnet prop­erties at elevated temperatures.
  • permanent magnets used in electric motors may encounter motor operating temperatures in excess of 150°C.
  • the permanent magnet alloy R2Fe14B has a tempera­ture dependence of magnetization of -0.08% to -0.12% per °C over the temperature range of -50°C to 150°C. Accordingly, this permanent magnet alloy is limited with respect to high-temperature applications, and particular­ly use in electric motors operating at temperatures in excess of 150°C. For practical applications, it is necessary that permanent magnet alloys at the maximum operating temperature exhibit a magnetization of 8000 Gauss.
  • the present invention provides a permanent magnet alloy characterised in comprising R2Fe14B, wherein R is a combination of rare earth elements consisting of, in atomic percent, Nd 1 to 11 and balance Ho and, optionallyly, up to 10% Gd, up to 15% Tb, up to 16% Dy, up to 18% Er and/or up to 13% Tm, said alloy exhibiting in combina­tion less than -0.01% per °C over the temperature range of -50 C to 250C and M s greater than 750 Gauss at room temperature.
  • the alloy composition of the invention is a combina­tion of rare earth elements (R), in atomic percent, in combination with the base composition R2Fe14B.
  • R is neo­dymium 1 to 11% preferably 3 to 11%, and balance holmium. The following are preferred limits for Nd and Ho and also preferred additional and optional rare earth elements.
  • the permanent magnet alloy of the invention includ­ing optional additional rare earth elements satisfies the above-stated properties with respect to a low temperature coefficient of magnetization in combination with magnetization at room temperature sufficient to enable the permanent magnets made from the alloy to retain suff­icient magnetization for use at elevated temperatures.
  • the permanent magnet alloy of the invention consists essentially of R2Fe14B wherein R is a combination of rare earth elements consisting essentially of, in atomic per­cent, Nd 1 to 11, preferably 3 to 11, and balance Ho and optional elements.
  • the alloy may optionally contain the additional rare earth elements gadolinium (Gd) up to 10%; terbium (Tb) up to 15%; dysprosium (Dy) up to 16%; erbium (Er) up to 18%, and thulium (Tm) up to 13%.
  • Gd gadolinium
  • Tb terbium
  • Dy dysprosium
  • Er erbium
  • Tm thulium up to 13%
  • Ho is preferably within the range of 72 to 92%.
  • the temperature coefficient of magnetization or the temperature dependence of magnetization in alloys of neo­dymium and iron result from the thermal effects on the ordered magnetic moment of the Nd sublattice and the iron sublattice.
  • the magnetic moment of the Nd sublattice decreases much more rapidly than that of the iron sublattice. This results in a strong temperature depen­dence of the combined magnetic moment of Nd and iron. Consequently, as is well recognised, this alloy is not suitable to provide a constant flux in the presence of temperature variations.
  • heavy rare earth elements such as Gd, Tb, Dy, Ho, Er, Tm, and Yb
  • the rare earth sublattice likewise exhibits a decrease in magnetic moment with increased temperature.
  • the alpha values for the alloys are in the desired range; however, magnetization (M s ) is lower than required. This is the case with respect to the alloys containing the heavy rare earth elements Ho, Tb and Dy.
  • M s values are at acceptable levels but is not within the required range.
  • Nd was added to the heavy rare earth element containing alloys of Table I.
  • the results from the standpoint of the com­bination of M s and alpha by the addition of Nd is shown by the data presented in Tables II through Tables VII.
  • Tm can be varied from 0 to 13% in combination with Nd and Ho within the range of 83 to 96% to achieve the desired combination of properties.
  • Table XIV shows that with Nd within the range of 7 to 11% the properties are obtained if Ho is maintained within the range of 78 to 90% and Tb varies 9 to 12%.
  • Table XV the desired combination of properties are achieved with alloys containing the addition of 7 to 11%, Ho 75 to 90%, and Dy within the range of 0 to 15%.
  • Table XVI shows that the desired combination of properties may be achieved with 7 to 11% Nd, 82 to 90% Ho, and 0 to 10% Gd.
  • Nd is combined with Tb, Gd and Ho. Specifically, the data shows that if Nd varies from 1 to 10%, Tb 0 to 10%, and Gd 0 to 4% with Ho within the range of 80 to 90% the desired combination of properties is achieved.
  • Table XXI shows combinations of Nd with Er, Tm and Ho. The data shows that the desired combination of properties may be achieved if Nd varies from 3 to 11%, Tm from 0 to 12%, Er from 0 to 18%, and Ho from 76 to 92%.
  • Table XXIII shows alloys wherein the Nd is combined with Tb, Dy and Ho. The desired combination of proper­ties is achieved if Nd varies from 9 to 11, Dy varies 0 to 15, Tb from 0 -12 and Ho is within the range from 75 to 88%.
  • Table XXV shows alloy compositions of Nd with Gd, Dy and Ho if Nd varies from 8 to 12%, Dy from 0 to 15%, Gd from 0 to 8%, and Ho is within the range from 72 to 88%, the alloys exhibit the desired combination of properties.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Hard Magnetic Materials (AREA)
EP87310200A 1987-02-04 1987-11-19 Alliage pour aimant permanent pour applications à haute température Withdrawn EP0277416A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US1073887A 1987-02-04 1987-02-04
US10738 1987-02-04

Publications (2)

Publication Number Publication Date
EP0277416A2 true EP0277416A2 (fr) 1988-08-10
EP0277416A3 EP0277416A3 (fr) 1990-05-16

Family

ID=21747166

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87310200A Withdrawn EP0277416A3 (fr) 1987-02-04 1987-11-19 Alliage pour aimant permanent pour applications à haute température

Country Status (2)

Country Link
EP (1) EP0277416A3 (fr)
JP (1) JPS63195246A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0468449A1 (fr) * 1990-07-24 1992-01-29 Kanegafuchi Kagaku Kogyo Kabushiki Kaisha Aimant aggloméré en terre rare et procédé pour sa fabrication

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0134305A1 (fr) * 1983-08-02 1985-03-20 Sumitomo Special Metals Co., Ltd. Aimant permanent
EP0185439A1 (fr) * 1984-12-10 1986-06-25 Crucible Materials Corporation Alliage d'aimant permanent
JPS61164206A (ja) * 1985-01-16 1986-07-24 Seiko Instr & Electronics Ltd 永久磁石

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61130453A (ja) * 1984-11-28 1986-06-18 Sumitomo Special Metals Co Ltd 耐食性のすぐれた永久磁石の製造方法
JPS61136656A (ja) * 1984-12-07 1986-06-24 Sumitomo Special Metals Co Ltd 高性能焼結永久磁石材料の製造方法
JPS61140106A (ja) * 1984-12-13 1986-06-27 Sumitomo Special Metals Co Ltd 永久磁石の着磁組立方法
JPH0678582B2 (ja) * 1985-03-26 1994-10-05 住友特殊金属株式会社 永久磁石材料

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0134305A1 (fr) * 1983-08-02 1985-03-20 Sumitomo Special Metals Co., Ltd. Aimant permanent
EP0185439A1 (fr) * 1984-12-10 1986-06-25 Crucible Materials Corporation Alliage d'aimant permanent
JPS61164206A (ja) * 1985-01-16 1986-07-24 Seiko Instr & Electronics Ltd 永久磁石

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, vol. 10, no. 367 (E-462)[2424], 9th December 1986; & JP-A-61 164 206 (SEIKO INSTR. & ELECTRONICS LTD) 24-07-1986 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0468449A1 (fr) * 1990-07-24 1992-01-29 Kanegafuchi Kagaku Kogyo Kabushiki Kaisha Aimant aggloméré en terre rare et procédé pour sa fabrication

Also Published As

Publication number Publication date
EP0277416A3 (fr) 1990-05-16
JPS63195246A (ja) 1988-08-12

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Inventor name: NARASIMHAN, K.S.V.L.