公开(公告)号：US20230025223A1

公开(公告)日：2023-01-26

申请号：US17779619

申请日：2020-11-26

Applicant: TDK CORPORATION

Inventor： Yoshinori FUJIKAWA ,  Atsushi KODA ,  Mika JINGU ,  Takashi WATANABE

IPC: H01F1/057 ,  C22C38/00

Abstract: An R-T-B based permanent magnet including 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.