Title:
希土類コバルト系永久磁石、その製造方法、モータ、及びデバイス
Document Type and Number:
Japanese Patent JP6549720
Kind Code:
B2
Abstract:
A rare-earth cobalt permanent magnet with good magnetic properties is provided. A rare-earth cobalt permanent magnet contains 23 to 27 mass % R, 3.5 to 5.0 mass % Cu, 18 to 25 mass % Fe, 1.5 to 3.0 mass % Zr in mass and a remainder Co with inevitable impurities, where an element R is a rare earth element at least containing Sm. The rare-earth cobalt permanent magnet has a metal structure including a plurality of crystal grains and a continuously extending grain boundary. A content of Cu in the grain boundary is higher than a content of Cu in the crystal grains, and a content of Zr in the grain boundary is higher than a content of Zr in the crystal grains.
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Inventors:
Takezawa Masaaki
Teruhiko Fujiwara
Hiroaki Machida
Hideyuki Yoshikawa
Teruhiko Fujiwara
Hiroaki Machida
Hideyuki Yoshikawa
Application Number:
JP2017544376A
Publication Date:
July 24, 2019
Filing Date:
October 07, 2016
Export Citation:
Assignee:
Kyushu Institute of Technology
Tokin Co., Ltd.
Tokin Co., Ltd.
International Classes:
H01F1/055; B22F1/00; B22F3/00; B22F3/10; B22F3/24; B22F9/04; C22C19/07; H01F41/02
Domestic Patent References:
| JP2014156656A | ||||
| JP2015109446A | ||||
| JP629658B2 |
Foreign References:
| WO2016084118A1 | ||||
| WO2015141205A1 | ||||
| WO2009145229A1 |
Attorney, Agent or Firm:
Ken Ieiri