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Title:
PERMANENT MAGNET AND PRODUCTION METHOD FOR PERMANENT MAGNET
Document Type and Number:
WIPO Patent Application WO/2013/047469
Kind Code:
A1
Abstract:
Provided are a permanent magnet and a production method for a permanent magnet, whereby no gaps occur between the main phase and the grain boundary phase of the magnet after sintering, and the whole magnet can be densely sintered.　An organometallic compound solution having an organometallic compound indicated by M- (OR)x added thereto is added to a fine powder of a pulverized neodymium magnet, and the organometallic compound is uniformly deposited on the surface of the neodymium magnet particles. (In formula, M is Cu, Al, Dy, Tb, V, Mo, Zr, Ta, Ti, W, or Nb. R is a substituent group comprising a hydrocarbon, and can be a straight chain or a branched chain. x is any integer.) Then, the dried magnet powder undergoes calcination in hydrogen by being held for several hours at 200-900°C in a hydrogen atmosphere pressurized to a higher pressure than atmospheric pressure, and the calcined body in powder form, calcined by calcination in hydrogen, undergoes dehydrogenation by being held for several hours at 200-600°C in a vacuum atmosphere.

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Inventors:
TAIHAKU KEISUKE (JP)
OZAKI TAKASHI (JP)
KUME KATSUYA (JP)
OKUNO TOSHIAKI (JP)
OZEKI IZUMI (JP)
OMURE TOMOHIRO (JP)
YAMAMOTO TAKASHI (JP)
Application Number:
PCT/JP2012/074473
Publication Date:
April 04, 2013
Filing Date:
September 25, 2012
Export Citation:
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Assignee:
NITTO DENKO CORP (JP)
International Classes:
H01F1/08; B22F1/107; B22F3/00; B22F3/10; H01F1/057; H01F41/02; C22C38/00
Domestic Patent References:
WO2011125591A12011-10-13
WO2011125592A12011-10-13
Foreign References:
JP2009259955A2009-11-05
JP2009259956A2009-11-05
JP2009259957A2009-11-05
JP2007134417A2007-05-31
JPH05320708A1993-12-03
JP3298219B22002-07-02
Other References:
See also references of EP 2763146A4
Attorney, Agent or Firm:
NEXT INTERNATIONAL (JP)
Patent business corporation NeXT (JP)
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