Title:
PRODUCTION METHOD FOR RARE EARTH PERMANENT MAGNET
Document Type and Number:
WIPO Patent Application WO/2014/034851
Kind Code:
A1
Abstract:
A production method for a rare earth permanent magnet, wherein: a sintered magnet body comprising an R1-Fe-B composition (R1 represents one or more elements selected from among rare earth elements, including Y and Sc) is immersed in an electrodeposition liquid obtained by dispersing a powder containing an R2 oxyfluoride and/or an R3 hydride (R2 and R3 represent one or more elements selected from among rare earth elements, including Y and Sc) in a solvent; an electrodeposition process is used to coat the powder onto the surface of the sintered magnet body; and, in the state in which the powder is present on the surface of the magnet body, the magnet body and the powder are subjected to a heat treatment in a vacuum or an inert gas at a temperature equal to or less than the sintering temperature of the magnet.
Inventors:
NAGASAKI YOSHIFUMI (JP)
SHIMAO MASANOBU (JP)
SHIMAO MASANOBU (JP)
Application Number:
PCT/JP2013/073327
Publication Date:
March 06, 2014
Filing Date:
August 30, 2013
Export Citation:
Assignee:
SHINETSU CHEMICAL CO (JP)
International Classes:
H01F41/02; B22F3/24; C22C38/00; H01F1/057; H01F1/08
Domestic Patent References:
| WO2006043348A1 | 2006-04-27 | |||
| WO2006043348A1 | 2006-04-27 |
Foreign References:
| JP2007053351A | 2007-03-01 | |||
| JP2007288020A | 2007-11-01 | |||
| JP2007288021A | 2007-11-01 | |||
| JP2011114149A | 2011-06-09 | |||
| JP2012169436A | 2012-09-06 | |||
| JPH0531807B2 | 1993-05-13 | |||
| JPH0521218A | 1993-01-29 | |||
| JP2007053351A | 2007-03-01 |
Other References:
K. D. DURST; H. KRONMULLER: "THE COERCIVE FIELD OF SINTERED AND MELT-SPUN NdFeB MAGNETS", JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, vol. 68, 1987, pages 63 - 75, XP024487191, DOI: doi:10.1016/0304-8853(87)90097-7
K. T. PARK; K. HIRAGA; M. SAGAWA: "Effect of Metal-Coating and Consecutive Heat Treatment on Coercivity of Thin Nd-Fe-B Sintered Magnets", PROCEEDINGS OF THE SIXTEEN INTERNATIONAL WORKSHOP ON RARE-EARTH MAGNETS AND THEIR APPLICATIONS, SENDAI, 2000, pages 257, XP008130311
K. MACHIDA; H. KAWASAKI; S. SUZUKI; M. ITO; T. HORIKAWA: "Grain Boundary Tailoring of Nd-Fe-B Sintered Magnets and Their Magnetic Properties", PROCEEDINGS OF THE 2004 SPRING MEETING OF THE POWDER & POWDER METALLURGY SOCIETY, 2004, pages 202, XP008130303
See also references of EP 2892064A4
K. T. PARK; K. HIRAGA; M. SAGAWA: "Effect of Metal-Coating and Consecutive Heat Treatment on Coercivity of Thin Nd-Fe-B Sintered Magnets", PROCEEDINGS OF THE SIXTEEN INTERNATIONAL WORKSHOP ON RARE-EARTH MAGNETS AND THEIR APPLICATIONS, SENDAI, 2000, pages 257, XP008130311
K. MACHIDA; H. KAWASAKI; S. SUZUKI; M. ITO; T. HORIKAWA: "Grain Boundary Tailoring of Nd-Fe-B Sintered Magnets and Their Magnetic Properties", PROCEEDINGS OF THE 2004 SPRING MEETING OF THE POWDER & POWDER METALLURGY SOCIETY, 2004, pages 202, XP008130303
See also references of EP 2892064A4
Attorney, Agent or Firm:
KOJIMA Takashi et al. (JP)
Takashi Kojima (JP)
Takashi Kojima (JP)
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