Title:
METHOD FOR MANUFACTURING R-T-B SINTERED MAGNET
Document Type and Number:
WIPO Patent Application WO/2015/182705
Kind Code:
A1
Abstract:
The present invention includes a step for performing a heat treatment at or below the sintering temperature of an R-T-B sintered magnet when a surface of the R-T-B sintered magnet is made to have an RLAl alloy powder (RL: Nd and/or Pr) and an RH compound powder (RH: Dy and/or Tb, the RH compound being one or more compounds selected from the group consisting of an RH fluoride, an RH oxide, and an RH acid fluoride). The RLAl alloy contains 65% by atoms of RL, and the melting point of the RLAl alloy is at or below the heat treatment temperature. The heat treatment is carried out when the RLAl alloy powder and the RH compound powder are present on the surface of the RTB sintered magnet at a mass ratio (RLAl alloy/RH compound) of 96:4 to 5:5.
Inventors:
MINO SHUJI
Application Number:
PCT/JP2015/065404
Publication Date:
December 03, 2015
Filing Date:
May 28, 2015
Export Citation:
Assignee:
HITACHI METALS LTD (JP)
International Classes:
H01F41/02; B22F1/00; B22F3/24; C22C33/02; H01F1/057; H01F1/08; C22C38/00
Domestic Patent References:
| WO2008139690A1 | 2008-11-20 |
Foreign References:
| JP2012049492A | 2012-03-08 | |||
| JP2014063850A | 2014-04-10 | |||
| JP2011159852A | 2011-08-18 | |||
| JP2007287874A | 2007-11-01 |
Attorney, Agent or Firm:
OKUDA SEIJI (JP)
Seiji Okuda (JP)
Seiji Okuda (JP)
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