Molded rare-earthrare-earth magnet and low temperature solidification molding method
AssigneeNissan Motor Co., Ltd.
InventorsYoshio Kawashita, Kazuhiko Takashima, Yoshitaka Uehara, Toshikazu Nanbu, Kiyohiro Uramoto
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Abstract
A molded rare-earth magnet which simultaneously satisfies increased film thickness, high density, and improved magnetic properties (in particular, coercive force, residual magnetic flux density, and tight adhesion) has a rare-earth magnet phase that contains as a main component a nitride which contains Sm and Fe, in which the molded rare-earth magnet has a density of 80% or higher of the theoretical density of a molded magnet constituted of the rare-earth magnet phase, and has a structure in which particles of Zn and/or Mn have been dispersed in the molded magnet.
Claims14
A molded rare-earth magnet comprising:
- a rare-earth magnet phase that contains as a main component a nitride which contains Sm and Fe, wherein the molded rare-earth magnet has a density of 80% or higher of the theoretical density of a molded magnet constituted of the rare-earth magnet phase, and has a structure in which particles of Zn and/or Mn and non-magnetic metal particles which have 50% or less of elasto-plasticity ratio of energy accompanied with plastic deformation of particles are dispersed in the molded magnet, and
- the molded magnet is obtained by using a process of forming a powder film by which the film is formed by depositing particles.
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A method for producing a molded magnet comprising:
- a spraying step in which a raw material powder containing nitride is mixed with carrier gas and the raw material powder is sprayed with high speed carrier gas in an accelerated state;
- and
- a solidification molding step in which the sprayed raw material powder is deposited on a substrate for solidification molding,
- wherein the raw material powder contains nitride-based rare-earth magnet powder and Zn and/or Mn particles, and non-magnetic metal particles which have 50% or less of elasto-plasticity ratio of energy accompanied with plastic deformation of particles,
- temperature of the high speed carrier gas at the spraying step is lower than decomposition temperature of the nitride, and
- the solidification molding step is performed under atmospheric pressure.
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Dependencies are inferred from the claim text.