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Title:
PRODUCTION METHOD FOR R-T-B-BASED SINTERED MAGNET
Document Type and Number:
WIPO Patent Application WO/2016/093173
Kind Code:
A1
Abstract:
The present invention includes a step in which heat treatment is performed at no more than the sintering temperature for an R-T-B-based sintered magnet, said heat treatment being performed in a state in which an RLM alloy powder (RL being Nd and/or Pr and M being at least one type of element selected from Cu, Fe, Ga, Co, Ni, and Al) and an RH compound powder (RH being Dy and/or Tb and the RH compound being an RH fluoride and/or an RH oxyfluoride) are present on the surface of the R-T-B-based sintered magnet. The RLM alloy includes at least 50 atm% RL and the melting point of the RLM alloy is no more than the heat treatment temperature. The heat treatment occurs in a state in which the RLM alloy powder and the RH compound powder are present on the surface of the R-T-B-based sintered magnet at a mass ratio of RLM alloy:RH compound = 9.6:0.4-5:5.

Inventors:
MINO Shuji
Application Number:
JP2015/084175
Publication Date:
June 16, 2016
Filing Date:
December 04, 2015
Export Citation:
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Assignee:
HITACHI METALS, LTD. (2-70, Konan 1-chome Minato-k, Tokyo 24, 〒1088224, JP)
International Classes:
H01F41/02; B22F1/00; B22F3/24; C22C28/00; C22C33/02; C22C38/00; H01F1/057; H01F1/08
Domestic Patent References:
2006-10-26
Foreign References:
JP2009302119A2009-12-24
JP2010186857A2010-08-26
Attorney, Agent or Firm:
OKUDA Seiji (OKUDA & ASSOCIATES, 10th Floor Osaka Securities Exchange Bldg., 8-16, Kitahama 1-chome, Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)
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