異方性希土類-Fe-B系ボンド磁石の開発現況

概要

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Recent trends in developing anisotropic rare-earth bonded magnets based on R-Fe-B system (R: rare-earth elements) are reviewed.The paper starts to describe the current output of rare-earth bonded magnets in comparing with that of sintered rare-earth magnets.The preparation procedures of anisotropic R-Fe-B bonded magnets, such as meltspun or conventional powder techniques are introduced. Both techniques are facing some problems in producing the anisotropic bonded magnets. Melt-spinning technique consists of long clumsy processes such as hot-pressing and die-upsetting. Conventional powder techniques are unable to produce injection-moulded bonded magnets. Possible new simple process to form the anisotropic melt-spun ribbons will be critically discussed.
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