EP0868733B1 - Weichmagnetische legierungen - Google Patents

Weichmagnetische legierungen Download PDF

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Publication number
EP0868733B1
EP0868733B1 EP96942478A EP96942478A EP0868733B1 EP 0868733 B1 EP0868733 B1 EP 0868733B1 EP 96942478 A EP96942478 A EP 96942478A EP 96942478 A EP96942478 A EP 96942478A EP 0868733 B1 EP0868733 B1 EP 0868733B1
Authority
EP
European Patent Office
Prior art keywords
soft magnetic
less
alloys
equal
alloy
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 - Lifetime
Application number
EP96942478A
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English (en)
French (fr)
Other versions
EP0868733A1 (de
Inventor
Rodney Major
Baljit Parmar
Hywel Davies
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.)
Telcon Ltd
Original Assignee
Telcon Ltd
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Filing date
Publication date
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Publication of EP0868733A1 publication Critical patent/EP0868733A1/de
Application granted granted Critical
Publication of EP0868733B1 publication Critical patent/EP0868733B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H01F1/12—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
    • H01F1/153—Amorphous metallic alloys, e.g. glassy metals
    • H01F1/15308—Amorphous metallic alloys, e.g. glassy metals based on Fe/Ni
    • 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
    • H01F1/153—Amorphous metallic alloys, e.g. glassy metals
    • H01F1/15333—Amorphous metallic alloys, e.g. glassy metals containing nanocrystallites, e.g. obtained by annealing
    • 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
    • H01F1/153—Amorphous metallic alloys, e.g. glassy metals
    • H01F1/15358—Making agglomerates therefrom, e.g. by pressing
    • H01F1/15366—Making agglomerates therefrom, e.g. by pressing using a binder

Definitions

  • This invention relates to soft magnetic alloys exhibiting very low magnetostriction and very low coercive force.
  • EP-A-0271657 and EP-A-0302355 describe iron-based soft magnetic alloys having low core loss, high permeability and low magnetostriction. At least 50% of the alloy structure consists of fine crystalline particles having an average particle size of 100nm or less.
  • the composition of the alloys is represented by the general formula: [Fe 1-a M a ] 100-x-y-z- ⁇ - ⁇ - ⁇ Cu x Si y B z M' ⁇ M" ⁇ X ⁇ , wherein: M is Co and/or Ni; M' is at least one element selected from the group consisting of Nb, W, Ta, Zr, Hf, Ti and Mo; M" is at least one element selected from the group consisting of V, Cr, Mn, Al, elements in the platinum group, Sc, Y, rare earth elements, Au, Zn, Sn and Re; X is at least one element selected from the group consisting of C, Ge, P, Ga, Sb, In, Be and As, and a, x, y, z, ⁇ , ⁇ and ⁇ respectively satisfy 0 ⁇ a ⁇ x ⁇ 3, 0.1 ⁇ y ⁇ 30, 0 ⁇ z ⁇ 25, 5 ⁇ y+z ⁇ 30, 0.1 ⁇ 30, ⁇ 10 and ⁇ 10.
  • the optional component M" in the above alloys is included for the purpose of improving corrosion resistance or magnetic properties and of adjusting magnetostriction.
  • no compositions containing more than one atomic percent of aluminium are disclosed in EP-A-0271657 or EP-A-0302355.
  • EP-A-0342922 describes iron-based soft magnetic alloys having a controlled particle area ratio and a composition defined by the formula: Fe 100-a-b-c Cu a M b Z c , wherein M is at least one element selected from Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Mn, Co, Ni, Al and the Platinum group; Z is at least one element selected from Si, B, P, and C; and a, b, and c, expressed in atomic %, are as follows: 3 ⁇ a ⁇ 8; 0.1 ⁇ b ⁇ 8 ; 3.1 ⁇ a+b ⁇ 12; and 15 ⁇ c ⁇ 28.
  • the preferred alloy compositions are those in which ⁇ is about 1, ⁇ is about 9, x is between 13 and 14, y is about 3 and z is in the range 2-5 or 6-5-8.5.
  • a particularly preferred alloy composition is Fe 65.5 Si 13.5 B 9 Mo 3 Cu 1 Al 8 .
  • the soft magnetic alloy according to the present invention is preferably microcrystalline, such that at least 50% of the alloy structure is occupied by fine crystalline particles having an average particle dimension of less than 100nm.
  • the average particle dimension of the fine crystalline particles is less than 30nm and more preferably around 10nm.
  • the soft magnetic alloy according to the present invention is preferably provided in the form of ribbon which can be wound or worked into the final required shape before heat treatment.
  • the present invention also provides a dust core comprising a powder of the soft magnetic alloy according to the present invention as specified above, and further comprising a binder.
  • the soft magnetic alloy according to the present invention can be manufactured by methods known in the art, such as those described in detail in EP-A-0271657 or EP-A-0342922. Briefly, the preferred methods include quenching the molten alloy to form a substantially amorphous solid alloy, followed by annealing the amorphous alloy under controlled conditions to produce the desired microcrystalline structure.
  • the alloy powders can be formed into a dust core by ordinary press forming and sintering with an inorganic binder such as a metallic alkoxide, water glass, or low melting point glass.
  • an inorganic binder such as a metallic alkoxide, water glass, or low melting point glass.
  • Niobium-containing alloys having the compositions set forth in Table 1 are fabricated into ribbon, 1cm wide by 20 ⁇ m thick, using the free jet melt spinning technique under an argon atmosphere.
  • the structure of these ribbons is found to be almost completely amorphous by X-ray examination.
  • Flat 100mm lengths of the ribbon from each of the alloys are heat treated for a period of 1 hour at temperatures of 520°C and 540°C.
  • the temperature of 540°C is found to be optimum to achieve the lowest coercive force in the comparative non-aluminium containing alloy.
  • the optimum temperature to achieve the lowest coercive force in the aluminium containing alloys of the invention is found to be approximately 15°C lower.
  • the structure of the alloys following heat treatment at 520°C/540°C is examined by X-ray diffraction and transmission electron microscopy. A nano-crystalline structure is observed, with a crystal size of between 7.5 and 10.5nm.
  • Figures 1 and 2 show the values of coercive force obtained for all 12 experimental alloys following heat treatment at 520°C and 540°C, respectively. It can be seen that very low values have been achieved with alloy 3, containing 2% aluminium, and with alloy 10 which contains 6.5% aluminium. A surprising peak in the coercive force is observed near 6% Al content, and further investigation of this region is needed.
  • Figures 3 and 4 show the coercivity values following heat treatment at temperatures in the range 480°C to 600°C for alloys 3 and 10 respectively.
  • Figures 5 and 6 show the measured values for magnetostriction obtained for all of the 12 alloys following heat treatments at 520°C and 540°C respectively.
  • Figures 7 and 8 show that very low magnetostriction values can be achieved by increasing the heat treatment temperatures to 600°C.
  • a number of molybdenum-containing alloys having the composition set forth in Table 2 are fabricated using the method described in Example 1.
  • the crystal structure of the alloys is substantially identical to that of the alloys of Example 1.
  • Figure 9 shows that the coercive force of the alloys is lowered for the compositions containing 2% and 4% Al, and is especially low for the alloy composition containing 8% Al.
  • a surprising peak in the coercive force is seen once again at around 6% Al, but further experiments are needed in this composition region to confirm the peak.
  • Figure 10 shows that, for the alloy composition containing 8% Al, the coercive force is a minimum (i.e. 'optimised) for an annealing temperature of about 520°C.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Dispersion Chemistry (AREA)
  • Power Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Soft Magnetic Materials (AREA)
  • Materials For Medical Uses (AREA)

Claims (9)

  1. Weichmagnetische Legierung mit einer Zusammensetzung, dargestellt durch die allgemeine Formel: FeαCuβBγSixMyAlz, worin M Mo oder Nb ist und worin 0,5 ≤ β ≤1,5; 6≤ γ ≤10; 12 ≤ x ≤ 18; 2 ≤ y ≤ 5; 1,5 ≤ z ≤9,5 und α=100-(β+γ+x+y+z) sind, wobei alle Größen in Atom% ausgedrückt sind.
  2. Weichmagnetische Legierung nach Anspruch 1, worin β etwa 1, γ etwa 9, 13≤ x ≤14 und y etwa 3 sind.
  3. Weichmagnetische Legierung nach Anspruch 1 oder 2, worin 2 ≤ z ≤5 oder 6,5 ≤ z ≤8,5 ist.
  4. Weichmagnetische Legierung nach Anspruch 2, worin M Mo ist und z etwa 8 ist.
  5. Weichmagnetische Legierung nach einem vorhergehenden Anspruch, welche im wesentlich amorph ist.
  6. Weichmagnetische Legierung nach einem der Ansprüche 1 bis 4, worin mindestens 50% der Legierungsstruktur durch feine kristalline Teilchen mit einer durchschnittlichen Teilchendimension von weniger als 100 nm besetzt sind.
  7. Weichmagnetische Legierung nach Anspruch 6, wobei mindestens 50% der Legierungsstruktur durch feine kristalline Teilchen mit einer durchschnittlichen Teilchendimension von weniger als 30 nm besetzt sind.
  8. Weichmagnetische Legierung nach einem vorhergehenden Anspruch in der Form eines Pulvers.
  9. Magnetpulverkern, umfassend ein Pulver gemäß Anspruch 8 und ein Bindemittel.
EP96942478A 1995-12-18 1996-12-18 Weichmagnetische legierungen Expired - Lifetime EP0868733B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GBGB9525875.2A GB9525875D0 (en) 1995-12-18 1995-12-18 Soft magnetic alloys
GB9525875 1995-12-18
PCT/GB1996/003122 WO1997022978A1 (en) 1995-12-18 1996-12-18 Soft magnetic alloys

Publications (2)

Publication Number Publication Date
EP0868733A1 EP0868733A1 (de) 1998-10-07
EP0868733B1 true EP0868733B1 (de) 2001-06-13

Family

ID=10785633

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96942478A Expired - Lifetime EP0868733B1 (de) 1995-12-18 1996-12-18 Weichmagnetische legierungen

Country Status (6)

Country Link
EP (1) EP0868733B1 (de)
AT (1) ATE202236T1 (de)
AU (1) AU1185697A (de)
DE (1) DE69613398T2 (de)
GB (2) GB9525875D0 (de)
WO (1) WO1997022978A1 (de)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4881989A (en) * 1986-12-15 1989-11-21 Hitachi Metals, Ltd. Fe-base soft magnetic alloy and method of producing same
JP2713364B2 (ja) * 1988-05-11 1998-02-16 日立金属株式会社 耐熱性に優れた超微結晶軟磁性合金
EP0374847B1 (de) * 1988-12-20 1995-03-22 Kabushiki Kaisha Toshiba Weichmagnetische auf Fe-basierende Legierung
EP0435680B1 (de) * 1989-12-28 1995-04-05 Kabushiki Kaisha Toshiba Auf Eisen basierende weichmagnetische Legierung, ihr Herstellungsverfahren und Magnetkern daraus
JPH0754108A (ja) * 1993-08-09 1995-02-28 Toshiba Corp 恒透磁率性を有する磁性合金とその製造方法、およびそれを用いた磁心

Also Published As

Publication number Publication date
ATE202236T1 (de) 2001-06-15
GB2308386A (en) 1997-06-25
DE69613398D1 (de) 2001-07-19
GB2308386B (en) 1999-01-20
EP0868733A1 (de) 1998-10-07
GB9626249D0 (en) 1997-02-05
DE69613398T2 (de) 2001-11-29
WO1997022978A1 (en) 1997-06-26
GB9525875D0 (en) 1996-02-21
AU1185697A (en) 1997-07-14

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