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 (JP)
YOSHIMURA KOSHI (JP)
YOSHIMURA KOSHI (JP)
Application Number:
PCT/JP2011/064865
Publication Date:
January 05, 2012
Filing Date:
June 29, 2011
Export Citation:
Assignee:
HITACHI METALS LTD (JP)
FUJIHARA MAHORO (JP)
YOSHIMURA KOSHI (JP)
FUJIHARA MAHORO (JP)
YOSHIMURA KOSHI (JP)
International Classes:
H01F41/02; B22F3/24; C22C38/00; H01F1/053; H01F1/08
Domestic Patent References:
WO2009041639A1 | 2009-04-02 | |||
WO2009041639A1 | 2009-04-02 |
Foreign References:
JP2006019721A | 2006-01-19 | |||
JP2001160508A | 2001-06-12 | |||
JP2844269B2 | 1999-01-06 | |||
JP2002057052A | 2002-02-22 | |||
JP2006156853A | 2006-06-15 | |||
JP2006210864A | 2006-08-10 | |||
JP2007103523A | 2007-04-19 | |||
JP2007207936A | 2007-08-16 | |||
JP2008244126A | 2008-10-09 | |||
US5383978A | 1995-01-24 |
Other References:
See also references of EP 2590188A4
Attorney, Agent or Firm:
TSUJITA Takashi et al. (JP)
Yukifumi Tsujita (JP)
Yukifumi Tsujita (JP)
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Claims: