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Journal of Applied Physics / Volume 111 / Issue 7 / PROCEEDINGS OF THE 56TH ANNUAL CONFERENCE ON MAGNETISM AND MAGNETIC MATERIALS / Soft Magnetic Materials
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J. Appl. Phys. 111, 07A309 (2012); http://dx.doi.org/10.1063/1.3671431 (3 pages)

Continuous-annealing method for producing a flexible, curved, soft magnetic amorphous alloy ribbon

Bruno Francoeur and Pierre Couture

IREQ, Institut de recherche d’Hydro-Québec, Varennes, Québec J3X 1S1, Canada

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(Received 7 September 2011; accepted 18 October 2011; published online 14 February 2012)

A method has been developed for continuous annealing of an amorphous alloy ribbon moving forward at several meters per second, giving a curved shape to the ribbon that remains flexible afterward and can be easily wound into a toroidal core with excellent soft magnetic properties. A heat pulse was applied by a compact system on a Metglas 2605HB1 ribbon moving forward at 5 m/s to initiate a thermal treatment at 460 °C, near crystallization onset. The treatment duration was less than 0.1 s, and the heating and cooling rates were above 10 000 °C/s, which helped preserve most of the alloy as-cast ductility state. Such high temperature rates were achieved by forcing a static contact between the moving ribbon and a temperature-controlled roller. A tensile stress and a series of bending configurations were applied on the moving ribbon during the treatment to induce the development of magnetic anisotropy and to obtain the desired natural curvature radius. The core losses at 60 Hz of a toroidal test core wound with the resulting ribbon are lower than the specific values reported by the alloy manufacturer. This method can be implemented at the casting plant for supplying a low-cost, ready-to-use ribbon, easy to handle and cut, for mass production of toroidal cores for distribution transformer kernels (core and coil only), pulse power cores, etc.

© 2012 American Institute of Physics

Article Outline

  1. INTRODUCTION
    1. DESCRIPTION
  2. EXPERIMENTAL
  3. RESULTS
  4. DISCUSSION
  5. CONCLUSION

KEYWORDS, PACS, and IPC

Keywords

amorphous magnetic materials, bending, casting, crystallisation, ductility, eddy current losses, induced anisotropy (magnetic), magnetic annealing, magnetic leakage, metallic glasses, soft magnetic materials

PACS

  • 81.05.Kf

    Glasses (including metallic glasses)

  • 75.30.Gw

    Magnetic anisotropy

  • 75.50.Kj

    Amorphous and quasicrystalline magnetic materials

  • 75.60.Ej

    Magnetization curves, hysteresis, Barkhausen and related effects

  • 75.60.Nt

    Magnetic annealing and temperature-hysteresis effects

  • 81.05.Bx

    Metals, semimetals, and alloys

International Patent Classification (IPC)

  • C22C45/00

    Amorphous alloys

  • B01D9/00

    Crystallisation

  • B22D

    Casting of metals; Casting of other substances by the same processes or devices

  • C21D1/04

    With simultaneous application of supersonic waves, magnetic or electric fields

  • H01F1/00

    Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties

  • H01F1/12

    Of soft-magnetic materials

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3671431

PUBLICATION DATA

ISSN

0021-8979 (print)  
1089-7550 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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Figures (3) Tables (1)

Figures (click on thumbnails to view enlargements)

FIG.1
(Color) Ribbon treatment temperature profile and representation of compact annealing system with associated components.

FIG.1 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.2
(Color) Cutaway drawing of a hot roller.

FIG.2 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.3
(Color) Direct current B–H loop of the CFF-RTA test core superimposed on a pasted published dc B−H loop of a furnace-annealed HB1 core.14

FIG.3 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

Tables

Table I. Specific properties at 60 Hz of the CFF-RTA test core and of published furnace-annealed HB1 cores.14,15

View Table


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