Permanent magnet and device
AssigneesKyushu Institute of Technology, Tokin Corporation
InventorsMasaaki TAKEZAWA, Hiroaki MACHIDA, Teruhiko FUJIWARA, Hirokazu MAKUTA
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Abstract
A permanent magnet having excellent magnetic properties and a device including such a permanent magnet are provided. A permanent magnet consists of a sintered compact having a composition consisting of R: 23 to 27 wt % (R is a sum total of rare-earth elements including at least Sm), Fe: 22 to 27 wt %, Mn: 0.3 to 2.5 wt %, Cu: 4.0 to 5.0 wt %, and a remainder consisting of Co and unavoidable impurities, in which the sintered compact contains a plurality of crystal grains and grain boundary phases, and a concentration of Cu in at least a part of the grain boundary phases is 45 at % or higher.
Claims8
A permanent magnet consisting of a sintered compact having a composition consisting of R:
- 23 to 27 wt % (R is a sum total of rare-earth elements including at least Sm), Fe:
- 22 to 27 wt %, Mn:
- 0.3 to 2.5 wt %, Cu:
- 4.0 to 5.0 wt %, and a remainder consisting of Co and unavoidable impurities, wherein
- the sintered compact contains a plurality of crystal grains and grain boundary phases, and a concentration of Cu in at least a part of the grain boundary phases is 45 at % or higher.
Dependencies are inferred from the claim text.