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.

公开(公告)号：US11881351B2

公开(公告)日：2024-01-23

申请号：US17383459

申请日：2021-07-23

申请人： Yantai Shougang Magnetic Materials Inc

发明人： Zhanji Dong ,  Zhongjie Peng

IPC分类号： H01F41/02 ,  H01F1/057 ,  H01F3/08 ,  H01F7/02

CPC分类号： H01F41/0266 ,  H01F1/0577 ,  H01F1/0578 ,  H01F3/08 ,  H01F7/021 ,  B22F2998/10 ,  B22F1/10 ,  B22F3/04 ,  B22F3/10 ,  B22F2003/247

摘要： The disclosure provides a preparation method, which comprises:



providing a moulding die for a ring-shaped sintered Nd—Fe—B magnet;
placing a Nd—Fe—B magnetic powder into the mould cavity of the moulding die in a loosely packed state, the loosely packed height of the Nd—Fe—B magnetic powder is L;
placing a flexible cylindrical core into the loosely packed Nd—Fe—B magnetic powder at a L/2 position, wherein an axial direction of the flexible cylindrical core is horizontal and parallel to the direction of a magnetic field in the mould cavity;
applying a vertical pressure to the Nd—Fe—B magnetic powder to obtain a ring-shaped green block assembly with the flexible cylindrical core embedded;
after encapsulating and isolating the ring-shaped green block assembly, applying an isostatic pressure to the ring-shaped green block assembly;
sintering the ring-shaped green block assembly to obtain a ring-shaped sintered blank;
thermally aging, grinding and slicing the ring-shaped sintered blank.

公开(公告)号：US20190051435A1

公开(公告)日：2019-02-14

申请号：US16100107

申请日：2018-08-09

申请人： Yantai Shougang Magnetic Materials, Inc.

发明人： Kaihong Ding ,  Zhongjie Peng ,  Zhanji Dong ,  Xiulei Chen

IPC分类号： H01F1/057 ,  H01F7/02 ,  H01F41/02

摘要： A sintered R-T-B based permanent magnet includes a body having an easy-axis of magnetization. The body has a plurality of R2T14B main phases spaced from one another and a plurality of grain boundary phases between the R2T14B main phases. The body including zero heavy rare earth elements and the grain boundary phases includes a first and a second grain boundary phase. The first grain boundary phase is disposed between the R2T14B main phases and extends along and parallel to the easy-axis of magnetization whereby the first grain boundary phase forms a plurality of first grain boundary triple point areas with the first grain boundary triple point areas being a rare earth element rich phase having a high content of Al and Ga and includes 65 at. %≤Pr+Nd≤88 at. %, 10 at. %≤Al+Ga≤25 at. %, O≤10 at. %, and Fe+Cu+Co≤2 at. %. A method of making the sintered R-T-B based permanent magnet is disclosed herein.