Title:
R-T-B BASED PERMANENT MAGNET
Document Type and Number:
WIPO Patent Application WO/2021/107012
Kind Code:
A1
Abstract:
[Problem] To obtain an R-T-B based permanent magnet with improved magnetic characteristics, particularly residual magnetic flux density Br and coercive force Hcj. [Solution] An R-T-B based permanent magnet comprising R2T14B main phase crystal grains and a grain boundary. R represents one or more rare earth elements, T represents one or more iron group elements essentially including Fe or Fe and Co, and B represents boron. In a cross-section parallel to the alignment direction of the R-T-B based permanent magnet, the coverage of the R2T14B main phase crystal grains is 50.0% or more, and the area ratio of the R2T14B main phase crystal grains is 92.0% or more.
Inventors:
FUJIKAWA YOSHINORI (JP)
KODA ATSUSHI (JP)
JINGU MIKA (JP)
WATANABE TAKASHI (JP)
KODA ATSUSHI (JP)
JINGU MIKA (JP)
WATANABE TAKASHI (JP)
Application Number:
PCT/JP2020/044025
Publication Date:
June 03, 2021
Filing Date:
November 26, 2020
Export Citation:
Assignee:
TDK CORP (JP)
International Classes:
H01F41/02; H01F1/057
Foreign References:
| JP2007266026A | 2007-10-11 | |||
| JP2007059619A | 2007-03-08 |
Attorney, Agent or Firm:
MAEDA & SUZUKI (JP)
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