Title:
PRODUCTION METHOD FOR R-T-B SINTERED MAGNET
Document Type and Number:
WIPO Patent Application WO/2016/039352
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 powder of an RLM alloy (RL being Nd and/or Pr, and M being one or more element selected from among Cu, Fe, Ga, Co, Ni, and Al) and a powder of an RH compound (RH being Dy and/or Tb, and the RH compound being one or more compound selected from among an RH fluoride, an RH oxide, and an RH oxyfluoride) are present on the surface of the R-T-B sintered magnet. The RLM alloy includes 65 at% or more of RL, and the melting point of the RLM alloy is at or below the temperature of the heat treatment. The heat treatment is performed when the RLM alloy powder and the RH compound powder are present on the surface of the R-T-B sintered magnet at a mass ratio of RLM alloy:RH compound = 9.6:0.4-5:5.
Inventors:
MINO SHUJI
Application Number:
PCT/JP2015/075503
Publication Date:
March 17, 2016
Filing Date:
September 08, 2015
Export Citation:
Assignee:
HITACHI METALS LTD (JP)
International Classes:
H01F41/02; B22F1/12; B22F3/00; B22F3/24; C22C28/00; C22C33/02; H01F1/057; H01F1/08; C22C38/00
Domestic Patent References:
| WO2008139690A1 | 2008-11-20 |
Foreign References:
| JP2014150119A | 2014-08-21 | |||
| JP2012234971A | 2012-11-29 | |||
| JP2012199423A | 2012-10-18 | |||
| JP2012204696A | 2012-10-22 | |||
| JP2007287874A | 2007-11-01 |
Other References:
See also references of EP 3193347A4
Attorney, Agent or Firm:
OKUDA SEIJI (JP)
Seiji Okuda (JP)
Seiji Okuda (JP)
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