Title:
希土類焼結磁石及びその製造方法、並びにモータ及び自動車
Document Type and Number:
Japanese Patent JP5408340
Kind Code:
B2
Abstract:
A rare earth sintered magnet 10 including a magnet body that includes a rare earth compound, and a protective layer on the magnet body, having a first layer and a second layer in that order from the magnet body side, wherein the surface portion of the magnet body has a higher heavy rare earth element content than the interior of the magnet body that is surrounded by the surface portion, the first layer includes a rare earth oxide, the mass ratio of the heavy rare earth element being 1 or greater with respect to the light rare earth element, and the second layer includes an oxide containing iron and/or boron which is different from the rare earth oxide, the second layer having a lower rare earth oxide content than the first layer.
More Like This:
Inventors:
Satoshi Tanaka
Baba Takashi
Shin Iwasaki
Riki Ishizaka
Baba Takashi
Shin Iwasaki
Riki Ishizaka
Application Number:
JP2012508322A
Publication Date:
February 05, 2014
Filing Date:
March 28, 2011
Export Citation:
Assignee:
tdk Corporation
International Classes:
B22F3/24; H01F1/057; H01F1/08; H01F7/02; H01F41/02; C22C33/02; C22C38/00
Domestic Patent References:
| JP2005011973A | 2005-01-13 | |||
| JP2008135563A | 2008-06-12 | |||
| JP2008244126A | 2008-10-09 | |||
| JP2007207936A | 2007-08-16 |
Foreign References:
| WO2008120784A1 | 2008-10-09 | |||
| WO2005096326A1 | 2005-10-13 |
Attorney, Agent or Firm:
Yoshiki Hasegawa
Yoshiki Kuroki
Takashi Mikami
Yasunori Ishizaka
Yoshiki Kuroki
Takashi Mikami
Yasunori Ishizaka