公开(公告)号：US20240234028A1

公开(公告)日：2024-07-11

申请号：US18561373

申请日：2022-05-16

Applicant: MINEBEA MITSUMI Inc.

Inventor： Kentaro HANASHIMA ,  Haruhiro KOMURA

IPC: H01F41/02 ,  B22F3/00 ,  B22F3/14 ,  B22F3/16 ,  B22F3/24 ,  B22F5/10 ,  B22F9/04 ,  C22C38/00 ,  H01F1/057

CPC classification number: H01F41/0253 ,  B22F3/004 ,  B22F3/14 ,  B22F3/16 ,  B22F3/24 ,  B22F5/106 ,  B22F9/04 ,  C22C38/005 ,  H01F1/057 ,  B22F2003/248 ,  B22F2009/048 ,  B22F2201/02 ,  B22F2201/10 ,  B22F2301/355 ,  B22F2998/10 ,  B22F2999/00

Abstract: A method for manufacturing a rare-earth iron-based ring magnet includes: (a) obtaining a rare-earth iron-based magnet powder; (b) preparing a compound; (c) forming a green body; (d) inserting the green body into a composite mold, setting the composite mold in a spark plasma sintering (SPS) apparatus, and degreasing the green body by energization at a predetermined current density while applying a pressure to the green body under reduced pressure to obtain a degreased body; and (e) sintering the degreased body by energization at a current density while applying a pressure to the degreased body to obtain a rare-earth iron-based ring magnet.