Title:
フェライト焼結磁石、モータ、及び発電機
Document Type and Number:
Japanese Patent JP7056404
Kind Code:
B2
Abstract:
To provide a ferrite sintered magnet having a satisfactorily high coercive force.SOLUTION: A ferrite sintered magnet 10 comprises: a main phase made of ferrite and having a magnetoplumbite type crystal structure of hexagonal crystal; a first subphase containing La, Ca and Fe and having a higher La atomic ratio than that in the main phase, in which the La atomic ratio is higher than a Ca atomic ratio; and a second subphase containing La, Ca, Si, B and Fe, in which a Ca atomic ratio is higher than a La atomic ratio, a B atomic ratio is higher than an Fe atomic ratio, and the Fe atomic ratio is lower than that in the main phase. In a section of the ferrite sintered magnet 10,the second subphase accounts for an areal rate of 1% or more.SELECTED DRAWING: Figure 1
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Inventors:
Junichi Nagaoka
Hiroyuki Ono
Yuichi Sugawara
Hiroyuki Ono
Yuichi Sugawara
Application Number:
JP2018118100A
Publication Date:
April 19, 2022
Filing Date:
June 21, 2018
Export Citation:
Assignee:
tdk Corporation
International Classes:
H01F1/10; H02K1/17
Domestic Patent References:
| JP2000223307A | ||||
| JP2009120442A |
Foreign References:
| WO2012090935A1 |
Attorney, Agent or Firm:
Yoshiki Hasegawa
Yoshiki Kuroki
Mikami Takashi
Yoshiki Kuroki
Mikami Takashi