Title:
METHOD OF PRODUCING SURFACE-MODIFIED RARE EARTH SINTERED MAGNET
Document Type and Number:
WIPO Patent Application WO/2012/002412
Kind Code:
A1
Abstract:
Disclosed is a method of producing a surface-modified rare earth sintered magnet with having excellent magnetic characteristics and having extreme corrosive resistance even in environments with fluctuating temperature and humidity. The disclosed method of producing a surface-modified rare earth sintered magnet involves a step for heat treating at 200°C to 600°C a rare earth sintered magnet in an atmosphere having an oxygen partial pressure of 1x103Pa to 1x105Pa, a water vapor partial pressure of 45Pa or less, and a ratio of oxygen partial pressure to water vapor partial pressure (oxygen partial pressure / water vapor partial pressure) of 450 to 20000.
Inventors:
FUJIHARA Mahoro (Ltd. Magnetic Materials Research Laboratory 2-15-17, Egawa, Shimamoto-cho, Mishima-gu, Osaka 13, 〒6180013, JP)
藤原 真秀 (〒13 大阪府三島郡島本町江川２－１５－１７ 日立金属株式会社磁性材料研究所内 Osaka, 〒6180013, JP)
藤原 真秀 (〒13 大阪府三島郡島本町江川２－１５－１７ 日立金属株式会社磁性材料研究所内 Osaka, 〒6180013, JP)
Application Number:
JP2011/064865
Publication Date:
January 05, 2012
Filing Date:
June 29, 2011
Export Citation:
Assignee:
Hitachi Metals, Ltd. (1-2-1, Shibaura Minato-k, Tokyo 14, 〒1058614, JP)
日立金属株式会社 (〒14 東京都港区芝浦一丁目２番１号 Tokyo, 〒1058614, JP)
FUJIHARA Mahoro (Ltd. Magnetic Materials Research Laboratory 2-15-17, Egawa, Shimamoto-cho, Mishima-gu, Osaka 13, 〒6180013, JP)
日立金属株式会社 (〒14 東京都港区芝浦一丁目２番１号 Tokyo, 〒1058614, JP)
FUJIHARA Mahoro (Ltd. Magnetic Materials Research Laboratory 2-15-17, Egawa, Shimamoto-cho, Mishima-gu, Osaka 13, 〒6180013, JP)
International Classes:
H01F41/02; B22F3/24; C22C38/00; H01F1/053; H01F1/08
Attorney, Agent or Firm:
TSUJITA Takashi et al. (KT building 4F, 11-12 Takada 3-chome, Toshima-k, Tokyo 33, 〒1710033, JP)
Claims: