公开(公告)号：US20180366247A1

公开(公告)日：2018-12-20

申请号：US15627517

申请日：2017-06-20

Applicant: FORD GLOBAL TECHNOLOGIES, LLC

Inventor： WANFENG LI

IPC: H01F1/055 ,  B22F9/04 ,  B22F3/16 ,  C22C22/00 ,  C22C1/04

CPC classification number: H01F1/0557 ,  B22F3/02 ,  B22F3/1017 ,  B22F3/16 ,  B22F3/162 ,  B22F9/04 ,  B22F2009/043 ,  B22F2009/044 ,  B22F2201/10 ,  B22F2998/10 ,  C22C1/04 ,  C22C1/0491 ,  C22C22/00 ,  C22C2202/02 ,  H01F1/086

Abstract: A method comprising sintering a Mn and Bi powder compact at a first temperature for a first predetermined duration, based on the first temperature, and sintering the compact at a second temperature, less than the first temperature, for a second predetermined duration, greater than the first duration, is disclosed. The sintering at a first temperature for a first predetermined duration generates a predetermined MnBi LTP transition driving force to decrease a formation energy barrier for transition to MnBi LTP. Sintering the compact at the second temperature for the second predetermined duration forms a magnet containing the MnBi LTP.