Title:
NdFeB SINTERED MAGNET PRODUCTION METHOD AND PRODUCTION DEVICE, AND NdFeB SINTERED MAGNET PRODUCED WITH SAID PRODUCTION METHOD
Document Type and Number:
WIPO Patent Application WO/2011/024936
Kind Code:
A1
Abstract:
Disclosed are a production method and production device for producing a thin-shaped NdFeB sintered magnet with superior magnetic properties, particularly coercive force and degree of orientation, and an NdFeB sintered magnet produced with said production method and production device. The NdFeB sintered magnet production device is provided with a filling unit (1) that supplies an alloy powder (11) comprising a prescribed amount of Dy to molds (10) and fills the powder to a density in the range of 3.0 to 4.2 g/cm3, an orienting unit (3) that orients the molds (10) filled with the alloy powder (11) in a magnetic field, a sintering furnace (not shown) that with each mold (10) sinters the alloy powder (11) within the molds (10) that have been oriented by the orienting unit (3), and a conveying unit that comprises a belt conveyor and a manipulator (not shown) and conveys the molds (10) to each unit and the sintering furnace. The production device is also provided with coils for thermal orientation (20) that reduce the coercive force of each particle in the alloy powder (11) by heating the alloy powder (11) filled within the molds (10) before and/or after applying the magnetic field in the orienting unit (3).
Inventors:
SAGAWA MASATO (JP)
MIZOGUCHI TETSUHIKO (JP)
ASAZUMA MICHIYASU (JP)
HAYASHI SHINICHI (JP)
MIZOGUCHI TETSUHIKO (JP)
ASAZUMA MICHIYASU (JP)
HAYASHI SHINICHI (JP)
Application Number:
PCT/JP2010/064558
Publication Date:
March 03, 2011
Filing Date:
August 27, 2010
Export Citation:
Assignee:
INTERMETALLICS CO LTD (JP)
SAGAWA MASATO (JP)
MIZOGUCHI TETSUHIKO (JP)
ASAZUMA MICHIYASU (JP)
HAYASHI SHINICHI (JP)
SAGAWA MASATO (JP)
MIZOGUCHI TETSUHIKO (JP)
ASAZUMA MICHIYASU (JP)
HAYASHI SHINICHI (JP)
International Classes:
B22F1/00; H01F41/02; B22F3/00; B22F3/02; B22F3/10; C22C33/02; C22C38/00; H01F1/053; H01F1/08
Domestic Patent References:
| WO2008120784A1 | 2008-10-09 |
Foreign References:
| JP2009049202A | 2009-03-05 | |||
| JP2003017309A | 2003-01-17 | |||
| JP2006351957A | 2006-12-28 | |||
| JP2007281242A | 2007-10-25 | |||
| JPH05308030A | 1993-11-19 | |||
| JPH04192315A | 1992-07-10 | |||
| JP2008294468A | 2008-12-04 | |||
| JPS5946008A | 1984-03-15 | |||
| JP2006019521A | 2006-01-19 |
Other References:
See also references of EP 2472535A4
Attorney, Agent or Firm:
Kyoto International Patent Law Office (JP)
Patent business corporation Kyoto international patent firm (JP)
Patent business corporation Kyoto international patent firm (JP)
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