Title:
METHOD FOR PRODUCING RARE EARTH SINTERED MAGNETS
Document Type and Number:
WIPO Patent Application WO/2014/002983
Kind Code:
A1
Abstract:
This method for producing rare earth sintered magnets is characterized by including: 1) a step in which a slurry is prepared, said slurry containing a dispersion medium, and an alloy powder containing a rare earth element, iron and boron, in a prescribed ratio; 2) a step in which a cavity is prepared, said cavity being surrounded by a mold, and an upper punch and a lower punch, at least one of which moves, enabling the punches to move toward and away from each other inside the mold, and at least one of which has a drain hole for draining the dispersion medium of the slurry; 3) a step in which a magnetic field of at least 1.5 T is applied to the inside of the cavity in the direction parallel to the direction in which the upper punch and/or lower punch is capable of moving, and the slurry is supplied at a flow rate of 20 to 600 cm3/second with the upper punch and the lower punch in a stationary state so as to fill the cavity with the slurry; 4) a step in which, with the magnetic field being applied as is, a molded body of the alloy powder is obtained by carrying out press molding in the magnetic field, which brings the upper punch and the lower punch close; and 5) a step in which the molded body is sintered.
Inventors:
TSUKADA TAKASHI (JP)
NANSAKA TAKUYA (JP)
KIKUCHI SATORU (JP)
NANSAKA TAKUYA (JP)
KIKUCHI SATORU (JP)
Application Number:
PCT/JP2013/067335
Publication Date:
January 03, 2014
Filing Date:
June 25, 2013
Export Citation:
Assignee:
HITACHI METALS LTD (JP)
International Classes:
B22F1/00; H01F41/02; B22F3/00; B22F3/02; B22F3/035; B22F3/22; C22C33/02; C22C38/00; H01F1/057; H01F1/08; B22F9/04
Foreign References:
| JP2011216726A | 2011-10-27 | |||
| JP2010215992A | 2010-09-30 | |||
| JP2009016849A | 2009-01-22 | |||
| JP2001093765A | 2001-04-06 | |||
| JP2000353633A | 2000-12-19 | |||
| JPH10241981A | 1998-09-11 | |||
| JPH0757914A | 1995-03-03 | |||
| JP2001058294A | 2001-03-06 | |||
| JP2012146704A | 2012-08-02 |
Other References:
See also references of EP 2869319A4
Attorney, Agent or Firm:
SAMEJIMA, Mutsumi et al. (JP)
Mutsumi Sameshima (JP)
Mutsumi Sameshima (JP)
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