Title:
METHOD FOR PRODUCING R-T-B-BASED SINTERED MAGNETS
Document Type and Number:
WIPO Patent Application WO/2012/008426
Kind Code:
A1
Abstract:
A method for producing R-T-B-based sintered magnets includes: a step for preparing R-T-B-based sintered magnet bodies (1); a step for preparing RH diffusion sources that contain a heavy rare earth element (RH) (comprising Dy and/or Tb) and Fe with a mass% of 30 to 80; a step for charging the R-T-B-based sintered magnet bodies (1) and the RH diffusion sources (2) into a processing chamber (3) in such a manner that the R-T-B-based sintered magnet bodies (1) and the RH diffusion sources (2) can move relatively, and can come close to each other or come into contact with each other; and an RH diffusion step for heating the sintered magnet bodies (1) and the RH diffusion sources (2) at a temperature of 850°C to 1000°C while moving the sintered magnet bodies (1) and the RH diffusion sources (2) continuously or intermittently in the processing chamber (3).
Inventors:
KUNIYOSHI Futoshi (HITACHI METALS LTD., 2-15-17, Egawa, Shimamoto-cho, Mishima-gu, Osaka 13, 〒6180013, JP)
Application Number:
JP2011/065837
Publication Date:
January 19, 2012
Filing Date:
July 12, 2011
Export Citation:
Assignee:
HITACHI METALS, LTD. (2-1 Shibaura 1-chome, Minato-ku Tokyo, 14, 〒1058614, JP)
日立金属株式会社 (〒14 東京都港区芝浦１丁目２－１ Tokyo, 〒1058614, JP)
日立金属株式会社 (〒14 東京都港区芝浦１丁目２－１ Tokyo, 〒1058614, JP)
International Classes:
H01F41/02; B22F3/24; C22C28/00; C22C33/02; C22C38/00; H01F1/053; H01F1/08
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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Claims: