Rare earth bonded magnet and composition therefor

Details Rare earth bonded magnet and composition therefor Rare earth bonded magnet and composition therefor

1996-10-16

1999-03-30

Bonner, Melissa

Compositions

Magnetic

Free metal or alloy containing

252 6254, 148301, 148302, H01F 108, H01F 1055, H01F 1057, H01F 1059

Patent

active

058884173

ABSTRACT:
A rare earth bonded magnet formed by bonding a rare earth magnet powder with a binding resin contains the rare earth magnet powder, and a thermoplastic resin serving as the binding resin in an amount within a range of from 1 to 5 wt. %, and preferably further contains an oxidation inhibitor. As the rare earth magnet powder, for example, at least one of an Sm--Co alloy, an R--Fe--B alloy (where, R represents at least a kind of rare earth elements including Y) and an Sm--Fe--N alloy can be appropriately used. As the thermoplastic resin, for example, polyamide, a liquid crystal polymer, or a PPS is appropriately employed. As the oxidation inhibitor, a chelating agent is appropriately applicable. In such a rare earth bonded magnet, the thermoplastic resin covers the outer surface of the rare earth magnet powder 2, and is present so as to prevent particles of the magnet powder from coming into contact with each other. Such a rare earth bonded magnet should preferably have a void ratio of no more than 2 vol. %.

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