Title:
METHOD FOR PRODUCING RARE EARTH MAGNET
Document Type and Number:
WIPO Patent Application WO/2018/088393
Kind Code:
A1
Abstract:
Provided is a method for producing a rare earth magnet, which suppresses eddy current in a mold when a metal powder containing a rare earth element is oriented within the mold, and which improves the residual magnetic flux density of a rare earth magnet, while suppressing the occurrence of cracking in the rare earth magnet. This method for producing a rare earth magnet is characterized by comprising: a molding step wherein a metal powder containing a rare earth element is supplied into a mold 2 so as to form a molded body 10; an orientation step wherein a pulsed magnetic field H is applied to the molded body 10 held in the mold 2 so as to orient the metal powder contained in the molded body 10; and a sintering step wherein the molded body 10 separated from the mold 2 is sintered after the orientation step. This method for producing a rare earth magnet is also characterized in that: at least a part of the mold 2 is formed from a resin; and the molded body is sintered after being adjusted to have a density of from 3.0 g/cm3 to 4.4 g/cm3 (inclusive).
Inventors:
SUZUKI KENICHI (JP)
OHHATA OSAMU (JP)
OHSAWA AKIHIRO (JP)
OHHATA OSAMU (JP)
OHSAWA AKIHIRO (JP)
Application Number:
PCT/JP2017/040098
Publication Date:
May 17, 2018
Filing Date:
November 07, 2017
Export Citation:
Assignee:
TDK CORP (JP)
International Classes:
B22F3/02; H01F41/02; C22C38/00; H01F1/057
Domestic Patent References:
| WO2016047593A1 | 2016-03-31 | |||
| WO2011125591A1 | 2011-10-13 |
Foreign References:
| JPH0543904A | 1993-02-23 | |||
| JPH1174143A | 1999-03-16 |
Attorney, Agent or Firm:
HASEGAWA Yoshiki et al. (JP)
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