Title:
SINTERED MAGNET MANUFACTURING METHOD
Document Type and Number:
WIPO Patent Application WO/2018/138841
Kind Code:
A1
Abstract:
[Problem] To provide a method for manufacturing a sintered magnet having good yield and high coercive force.
[Solution] This sintered magnet manufacturing method comprises subjecting an Nd-Fe-B sintered magnet as a base material to grain boundary diffusion processing using an alloy powder comprising a rare-earth element R, and then removing a residue existing on a surface of the sintered magnet that has been subjected to the grain boundary diffusion processing. The alloy powder is represented by RxAyBz, where R is at least one of rare-earth elements comprising Sc and Y; A is Ca or Li; B is an unavoidable impurity; 2 ≤ x ≤ 99; 1 ≤ y < x; and 0 ≤ z < y. The removal of the residue is performed by projecting a projectile material onto the surface of the sintered magnet.
Inventors:
UENOHARA MASARU (JP)
SAKO MICHIHIRO (JP)
FURUYA TAKASHI (JP)
KAWAI SEIJI (JP)
SAKO MICHIHIRO (JP)
FURUYA TAKASHI (JP)
KAWAI SEIJI (JP)
Application Number:
PCT/JP2017/002793
Publication Date:
August 02, 2018
Filing Date:
January 26, 2017
Export Citation:
Assignee:
NISSAN MOTOR (JP)
International Classes:
H01F41/02; B22F1/00; B22F3/00; B22F3/24; H01F1/057
Domestic Patent References:
| WO2011122577A1 | 2011-10-06 | |||
| WO2006064848A1 | 2006-06-22 | |||
| WO2008032667A1 | 2008-03-20 | |||
| WO2017077830A1 | 2017-05-11 |
Foreign References:
| JP2009054754A | 2009-03-12 | |||
| JP2016122863A | 2016-07-07 | |||
| JP2014017480A | 2014-01-30 |
Attorney, Agent or Firm:
HATTA & ASSOCIATES (JP)
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