Title:
Rare earth permanent magnet
Document Type and Number:
Japanese Patent JP6255977
Kind Code:
B2
Abstract:
The present invention provides a rare earth based magnet that inhibits the high temperature demagnetization rate even when less or no heavy rare earth elements such as Dy, Tb and the like are used. The rare earth based magnet according to the present invention includes R2T14B main phase crystal grains and grain boundary phases between adjacent main phase crystal grains. In any cross-section of the rare earth based magnet, when evaluating the circular degree of the main phase crystal grains with Wadell's Roundness A, the shape of the main phase crystal grains is controlled such that the Roundness A becomes 0.24 or more.
Inventors:
Katsuo Sato
Eiji Kato
Eiji Kato
Application Number:
JP2013263371A
Publication Date:
January 10, 2018
Filing Date:
December 20, 2013
Export Citation:
Assignee:
tdk Corporation
International Classes:
H01F1/057; H01F41/02
Domestic Patent References:
| JP10135019A | ||||
| JP4359404A | ||||
| JP2004079922A | ||||
| JP2012164764A | ||||
| JP6084627A | ||||
| JP2001167916A | ||||
| JP2013110389A |
Attorney, Agent or Firm:
Maeda/Suzuki International Patent Corporation
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