公开(公告)号：US10256015B2

公开(公告)日：2019-04-09

申请号：US14906682

申请日：2014-08-08

Applicant: TDK Corporation

Inventor： Masashi Miwa ,  Haruna Nakajima ,  Isao Kanada

IPC: H01F1/059 ,  H01F1/053 ,  H01F1/057 ,  H01F41/02

Abstract: The present invention provides an R-T-B based sintered magnet having excellent corrosion resistance together with good magnetic properties. The R-T-B based sintered magnet contains R2T14B crystal grains, wherein, an R—Ga—Co—Cu—N concentrated part exists in a grain boundary formed between or among two or more adjacent R2T14B crystal grains, and the concentrations of R, Ga, Co, Cu and N in the R—Ga—Co—Cu—N concentrated part are higher than those in the R2T14B crystal grains respectively.