Title:
PROCESS FOR PRODUCTION OF R-T-B BASED SINTERED MAGNETS AND R-T-B BASED SINTERED MAGNETS
Document Type and Number:
WIPO Patent Application WO/2011/007758
Kind Code:
A1
Abstract:
A process for the production of R-T-B based sintered magnets which comprises: a step of preparing R-T-B based sintered magnet bodies (1); a step of preparing heavy rare earth element (RH) diffusion sources (2) that consist of a metallic RH (Dy and/or Tb) or an alloy thereof; a step of charging a treating chamber (3) with the sintered magnet bodies (1) and the RH diffusion sources (2) in such a manner that the sintered magnet bodies (1) and the RH diffusion sources (2) can move relatively, come close to each other, or come into contact with each other; and an RH diffusion step of heat-treating the sintered magnet bodies (1) and the RH diffusion sources (2) at 500 to 850°C for at least 10 minutes while moving the sintered magnet bodies (1) and the RH diffusion sources (2) continuously or intermittently in the treating chamber (3).
Inventors:
KUNIYOSHI FUTOSHI (JP)
Application Number:
PCT/JP2010/061776
Publication Date:
January 20, 2011
Filing Date:
July 12, 2010
Export Citation:
Assignee:
HITACHI METALS LTD (JP)
KUNIYOSHI FUTOSHI (JP)
KUNIYOSHI FUTOSHI (JP)
International Classes:
H01F41/02; B22F3/24; C22C33/02; C22C38/00; H01F1/053; H01F1/08
Domestic Patent References:
| WO2007102391A1 | 2007-09-13 |
Foreign References:
| JP2004296973A | 2004-10-21 | |||
| JP2007258455A | 2007-10-04 | |||
| JP2009043776A | 2009-02-26 | |||
| JP2009194262A | 2009-08-27 | |||
| JP2004296973A | 2004-10-21 | |||
| US5383978A | 1995-01-24 |
Other References:
See also references of EP 2455954A4
Attorney, Agent or Firm:
OKUDA SEIJI (JP)
Seiji Okuda (JP)
Seiji Okuda (JP)
Download PDF: