Title:
RARE-EARTH SINTERED MAGNET AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2014/065087
Kind Code:
A1
Abstract:
The present invention relates to a rare-earth sintered magnet having a relatively large principal phase, and a method for manufacturing said magnet, and provides a rare-earth sintered magnet of exceptional coercivity manufactured without using a heavy rare-earth element such as Dy, and a method for manufacturing said magnet. A rare-earth sintered magnet (M) comprising a RE-T-B principal phase (C) (where RE is Nd or Pr, and T is Fe or Fe partially substituted by Co), and a grain boundary phase (B) that surrounds the principal phase (C) and includes an RE element and a T element, wherein the T element concentration in the grain boundary phase (B) is 60 at% or less, the thickness of the grain boundary phase (B) is reduced further to the inside than the outer surface (S) of the rare-earth sintered magnet (M), and the average thickness of the grain boundary phase (B) in a region (SA) of the outer layer of the rare-earth sintered magnet (M) is 10 nm or more.
Inventors:
MIYAMOTO NORITAKA (JP)
SHOJI TETSUYA (JP)
HAGA KAZUAKI (JP)
SHOJI TETSUYA (JP)
HAGA KAZUAKI (JP)
Application Number:
PCT/JP2013/076768
Publication Date:
May 01, 2014
Filing Date:
October 02, 2013
Export Citation:
Assignee:
TOYOTA MOTOR CO LTD (JP)
MIYAMOTO NORITAKA (JP)
SHOJI TETSUYA (JP)
HAGA KAZUAKI (JP)
MIYAMOTO NORITAKA (JP)
SHOJI TETSUYA (JP)
HAGA KAZUAKI (JP)
International Classes:
B22F1/00; H01F1/08; B22F3/00; C22C33/02; H01F1/057; H01F41/02; C22C28/00
Foreign References:
| JP2008270699A | 2008-11-06 | |||
| JP2008266767A | 2008-11-06 | |||
| JP2008060183A | 2008-03-13 | |||
| JP2012234985A | 2012-11-29 |
Attorney, Agent or Firm:
HIRAKI Yusuke et al. (JP)
Yusuke Hiraki (JP)
Yusuke Hiraki (JP)
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