Title:
RARE-EARTH MAGNET
Document Type and Number:
WIPO Patent Application WO/2016/153055
Kind Code:
A1
Abstract:
[Problem] To provide a rare-earth magnet which can be used even in a high-temperature environment and in which high-temperature demagnetization is suppressed. [Solution] A sintered rare-earth magnet is configured to include main-phase grains having a B concentration difference within the main-phase grains. In other words, the present invention provides a rare-earth magnet that contains, as a main phase, crystal grains having an R2T14B crystalline structure, wherein: main-phase grains include main-phase grains having a B concentration difference within the grains; by configuring the concentration ratio A (A=αB/βB) between αB and βB, when the maximum concentration of B in the main-phase grains having a concentration difference is termed αB and the minimum concentration is termed βB, to be 1.05 or more, crystal magnetic anisotropy distribution is generated in the main phase; and due to this, the impact of heat is reduced and high-temperature demagnetization is suppressed.
Inventors:
OKAWA WAKAKO (JP)
GOTO SYOTA (JP)
FUJIKAWA YOSHINORI (JP)
GOTO SYOTA (JP)
FUJIKAWA YOSHINORI (JP)
Application Number:
PCT/JP2016/059731
Publication Date:
September 29, 2016
Filing Date:
March 25, 2016
Export Citation:
Assignee:
TDK CORP (JP)
International Classes:
H01F1/057; C22C38/00; H01F1/08; B22F3/00
Domestic Patent References:
| WO2011145674A1 | 2011-11-24 |
Foreign References:
| JP2014209546A | 2014-11-06 | |||
| JP2004072082A | 2004-03-04 | |||
| JP2013098447A | 2013-05-20 |
Attorney, Agent or Firm:
MAEDA & SUZUKI (JP)
Maeda and a Suzuki international patent business corporation (JP)
Maeda and a Suzuki international patent business corporation (JP)
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