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A Novel Process for Rare Earth-Iron-Boron Permanent Magnets Preparation

  • J. P. Nozieres
  • R. Perrier de la Bathie

Abstract

The work described in this paper derives from research to obtain magnetically isolated grains in Rare earth-Iron-Boron alloys without passing through the divided state, which is an essential process both in powder metallurgy and melt spinning. Industrialisation of those techniques imposed serious problems: Powders obtained by cold crushing are extremely reactive and pollution may drastically reduce magnetic properties, whilst, melt spinning is a sophisticated and relatively expensive process which is difficult to apply in a continuous way.

The process presented here consists of breaking grains of as-cast alloyed ingots by an appropriate mechanical hot-working technique. To our knowledge, it is the simplest and the cheapest way to prepare Rare earth-Iron-Boron permanent magnets at the present time.

Keywords

Permanent Magnet Saturation Field Directed Crystallisation Intergranular Phasis Deformation Ratio 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

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    Anisotropic NdFeB - Magnets made by plastic deformation of cast samples, W. Erwens.Google Scholar
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    Seiko Epson Corporation, Brevet d’Invention FRZ 586 323 AlGoogle Scholar
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    General Motors Corporation, European Patent EP 0231 620 AZ.Google Scholar

Copyright information

© ECSC, EEC, EAEC, Brussels and Luxembourg 1989

Authors and Affiliations

  • J. P. Nozieres
    • 1
  • R. Perrier de la Bathie
    • 1
  1. 1.Laboratoire Louis NéelC.N.R.S.Grenoble CedexFrance

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