公开(公告)号：US20170333993A1

公开(公告)日：2017-11-23

申请号：US15369046

申请日：2016-12-05

申请人： Hyundai Motor Company ,  Yantai Shougang Magnetic Materials Inc.

发明人： Jae Ryung Lee ,  Zhongjie Peng ,  Shengli Cui ,  Zhanji Dong ,  Yongcong Sun ,  Hongjian Chen

IPC分类号： B22F3/26 ,  B22F3/16 ,  H01F1/057 ,  B22F9/04 ,  C22C38/06 ,  C22C38/00 ,  C22C35/00 ,  C22C33/04 ,  H01F41/02 ,  C22C38/16

CPC分类号： B22F3/26 ,  B22F3/04 ,  B22F3/16 ,  B22F3/24 ,  B22F9/04 ,  B22F2009/044 ,  B22F2202/05 ,  B22F2301/35 ,  B22F2304/10 ,  B22F2998/10 ,  B22F2999/00 ,  C22C33/0207 ,  C22C33/04 ,  C22C35/005 ,  C22C38/002 ,  C22C38/005 ,  C22C38/06 ,  C22C38/16 ,  C22C2202/02 ,  H01F1/0576 ,  H01F1/0577 ,  H01F41/0266 ,  H01F41/0293 ,  B22F3/02 ,  B22F2201/10 ,  B22F2003/248 ,  B22F9/023 ,  B22F3/10 ,  C23C10/00 ,  B22F2003/247

摘要： Disclosed is a method of manufacturing a rare earth permanent magnet with substantially improved magnetic property. The method comprises: preparing a magnet master alloy by melting an R-T-B based alloy; pulverizing the magnet master alloy to provide a magnet powder; pressurizing the magnet powder as applying magnetic field to the magnet powder under an inert atmosphere to form a magnet molded body; sintering the magnet molded body under a vacuum atmosphere to obtain a sintered magnet molded body having oxygen content of about 0.1 wt % or less based on the total weight of the sintered magnet molded body; and treating the sintered magnet molded body with Dy and Tb.