Title:
R-T-B-BASED PERMANENT MAGNET AND METHOD FOR PRODUCING SAME, MOTOR, AND AUTOMOBILE
Document Type and Number:
WIPO Patent Application WO/2021/200873
Kind Code:
A1
Abstract:
[Problem] To provide an R-T-B-based permanent magnet having a high residual magnetic flux density Br and a high coercivity Hcj. [Solution] An R-T-B-based permanent magnet which contains R that represents at least one rare earth element essentially including Tb or Dy, T that represents Fe or at least one iron-group element essentially including Fe and Co, and B that represents boron, and further contains Cu. The total content of R is 28.35 to 29.95% by mass, inclusive, the content of Cu is 0.05 to 0.40% by mass, inclusive, and the content of B is 0.93 to 1.00% by mass, inclusive. The distribution of the concentration of Tb or Dy decreases from the outside of the R-T-B-based permanent magnet toward the inside of the R-T-B-based permanent magnet.
Inventors:
FUJIKAWA YOSHINORI (JP)
YAMADA REIJI (JP)
YAMADA REIJI (JP)
Application Number:
PCT/JP2021/013404
Publication Date:
October 07, 2021
Filing Date:
March 29, 2021
Export Citation:
Assignee:
TDK CORP (JP)
International Classes:
C22C38/00; H01F1/057
Foreign References:
| JP2018093201A | 2018-06-14 | |||
| JP2018174314A | 2018-11-08 | |||
| JP2017073465A | 2017-04-13 |
Attorney, Agent or Firm:
MAEDA & SUZUKI (JP)
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