Title:
R-T-B-BASED PERMANENT MAGNET AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2020/184565
Kind Code:
A1
Abstract:
[Problem] To provide an R-T-B-based permanent magnet having improved magnetic properties. [Solution] An R-T-B-based permanent magnet which contains R that represents at least one rare earth element essentially including Nd or Pr, T that represents at least one iron-group element essentially including Fe, B that represents boron, and M that represents at least one element selected from Ga, Al, Cu and Si. The R-T-B-based permanent magnet includes main-phase grains which comprise R2T14B crystals and two-grain grain boundaries each of which exists between adjacent two of the main-phase grains. The average thickness of the two-grain grain boundaries is 5 to 50 nm inclusive. The area ratio of an R6T13M compound in an arbitrary cross section is 0.50% or less (including 0%).
Inventors:
FUJIKAWA YOSHINORI (JP)
Application Number:
PCT/JP2020/010320
Publication Date:
September 17, 2020
Filing Date:
March 10, 2020
Export Citation:
Assignee:
TDK CORP (JP)
International Classes:
H01F41/02; H01F1/057
Domestic Patent References:
| WO2007077809A1 | 2007-07-12 |
Foreign References:
| JP2005276949A | 2005-10-06 | |||
| JP2006265600A | 2006-10-05 |
Attorney, Agent or Firm:
MAEDA & SUZUKI (JP)
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