A Novel Process for Rare Earth-Iron-Boron Permanent Magnets Preparation
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.
KeywordsPermanent Magnet Saturation Field Directed Crystallisation Intergranular Phasis Deformation Ratio
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