Title:
R-T-B BASED PERMANENT MAGNET
Document Type and Number:
WIPO Patent Application WO/2021/107010
Kind Code:
A1
Abstract:
[Problem] To provide an R-T-B based permanent magnet having high coercive force Hcj and residual flux density Br at room temperature and also having excellent coercive force Hcj and temperature characteristics at high temperatures. [Solution] Disclosed is an R-T-B based permanent magnet comprising R2T14B main phase crystal grains. R is at least one type of rare-earth element, T is at least one type of iron-group element essentially including Fe or Fe and Co, and B is boron. The R-T-B based permanent magnet further comprises C, wherein the content of C in the R2T14B main phase crystal grains is 300 ppm or less.
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Inventors:
FUJIKAWA YOSHINORI (JP)
JINGU MIKA (JP)
WATANABE TAKASHI (JP)
KODA ATSUSHI (JP)
JINGU MIKA (JP)
WATANABE TAKASHI (JP)
KODA ATSUSHI (JP)
Application Number:
PCT/JP2020/044022
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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