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

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


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.


Permanent Magnet Saturation Field Directed Crystallisation Intergranular Phasis Deformation Ratio 
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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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