公开(公告)号：US20240013958A1

公开(公告)日：2024-01-11

申请号：US18347840

申请日：2023-07-06

Applicant: YANTAI ZHENGHAI MAGNETIC MATERIAL CO., LTD.

Inventor： Yongjiang YU ,  Cong WANG ,  Lei LI ,  Fang JI ,  Rui WEI

IPC: H01F1/057 ,  B22F9/02 ,  B22F3/16 ,  H01F41/02 ,  B22F9/04 ,  B22F3/24

CPC classification number: H01F1/0577 ,  B22F9/023 ,  B22F3/162 ,  H01F41/0293 ,  B22F9/04 ,  B22F3/24 ,  B22F2998/10 ,  B22F2202/05 ,  B22F2003/248 ,  B22F2201/20 ,  B22F2201/03 ,  B22F2301/355

Abstract: The permanent magnet comprises a main phase structure of R2T14B crystal grains, and R is a rare earth element; T comprises at least Mn, Fe, and optionally a transition metal comprising Co; B is boron; the permanent magnet further comprises Mn and heavy rare earth elements which are distributed in a grain boundary in a diffusion mode. The heavy rare earth element is selected from at least one selected from Dy, Ho and Tb. According to the rare earth permanent magnet prepared through the preparation method, more heavy rare earth elements can be diffused into the magnet core along the grain boundary, Hcj distribution of the permanent magnet is improved, and meanwhile the corrosion resistance and the mechanical property of the permanent magnet are improved.