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公开(公告)号：US12100544B2
公开(公告)日：2024-09-24
申请号：US17209273
申请日：2021-03-23
发明人： Kunkun Yang , Chuanshen Wang , Zhongjie Peng , Kaihong Ding
CPC分类号： H01F41/0293 , H01F1/057
摘要： Some embodiments of the invention belongs to a technical field of NdFeB magnet processing, and mainly relates to a device and method for improving the coercivity of ring-shaped NdFeB magnet. A layer of heavy rare earth coating is sprayed on the inner and outer surfaces of the ring-shaped NdFeB magnet by the device, and then the ring-shaped NdFeB magnet sprayed with the heavy rare-earth coating is subjected to diffusion treatment to improve the coercivity of the ring-shaped NdFeB magnet. The invention uses heavy rare earth slurry as the diffusion source, combined with spraying technology, can quickly and uniformly cover a layer of heavy rare earth coating on the inner and outer surfaces of the ring-shaped NdFeB magnet, and the coercivity of the ring-shaped NdFeB magnet is improved after heat treatment.
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公开(公告)号：US11948734B2
公开(公告)日：2024-04-02
申请号：US17105533
申请日：2020-11-26
发明人： Chuanshen Wang , Kunkun Yang , Zhongjie Peng , Kaihong Ding
CPC分类号： H01F41/0293 , H01F1/0577
摘要： The invention relates to a method of increasing the coercivity of a sintered type NdFeB permanent magnet. The method comprises the following steps:
a) preparing of an organic film with a predetermined thickness on a surface of the sintered type NdFeB permanent magnet;
b) creating holes in the organic film according to a given pattern with the holes extending to the surface of the sintered type NdFeB permanent magnet;
c) filling the holes with a metal powder, the metal powder including or consisting of at least one of Dy and Tb; and
d) performing a thermally induced grain boundary diffusion process.-
公开(公告)号：US11569012B2
公开(公告)日：2023-01-31
申请号：US17083341
申请日：2020-10-29
发明人： Xiulei Chen , Zhongjie Peng , Xiaonan Zhu , Chunjie Xiang , Kaihong Ding
摘要： The present disclosure relates generally to a method for improving the performance of sintered NdFeB magnet. A method of preparing a sintered NdFeB magnet therefore comprises the steps of: a) preparing alloy flakes from a raw material of the NdFeB magnet by a strip casting process; and b) preparing a coarse alloy powder from the alloy flakes by a hydrogen decrepitation process, the hydrogen decrepitation process including treatment of the alloy flakes under a hydrogen pressure of 0.10 MPa to 0.25 MPa for a duration of 1 to 3.5 hours, then degassing the hydrogen at a predetermined temperature between 300° C. to 400° C. for a duration time of 0.5 to 5 hours, and then mixing the resulting coarse alloy powder with a lubricant.
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公开(公告)号：US11923114B2
公开(公告)日：2024-03-05
申请号：US17395495
申请日：2021-08-06
发明人： Kunkun Yang , Zhongjie Peng , Kaihong Ding
CPC分类号： H01F1/0577 , B22F1/05 , B22F1/17 , B22F2301/355 , B22F2304/10
摘要： The disclosure refers to a NdFeB alloy powder for forming high-coercivity sintered NdFeB magnets. The NdFeB alloy powder includes NdFeB alloy core particles with a multi-layered coating, wherein the multi-layered coating comprises:
a first metal layer directly disposed on the NdFeB alloy core particles, wherein the first metal layer consists of at least one of Tb and Dy;
a second metal layer directly disposed on the first metal layer, wherein the second metal layer consists of at least one of W, Mo, Ti, Zr, and Nb; and
a third metal layer directly disposed on the second metal layer, wherein the third metal layer consists of (i) at least one of Pr, Nd, La, and Ce; or (ii) a combination of one of the group consisting of Cu, Al, and Ga and at least one of the group consisting of Pr, Nd, La, and Ce.-
公开(公告)号：US11798740B2
公开(公告)日：2023-10-24
申请号：US17100975
申请日：2020-11-23
发明人： Kunkun Yang , Chuanshen Wang , Zhongjie Peng , Kaihong Ding
CPC分类号： H01F41/0293 , B41M1/12 , H01F1/0576 , H01F41/0266
摘要： The disclosure relates to a method for improving the coercivity of an arc-shaped Nd—Fe—B magnet. A method for increasing the coercivity of an arc-shaped Nd—Fe—B magnet is provided. Said method comprises the steps of:
a) providing of a flexible film with a heavy rare earth coating thereon, wherein the heavy rare earth coating comprises at least one of Dy and Tb;
b) arranging the arc-shaped Nd—Fe—B magnet and the flexible film such that a first curved surface of the arc-shaped Nd—Fe—B magnet and the heavy rare earth coating on the flexible film are facing each other;
such that a curved surface of the first ceramic body lies on the side of the flexible film opposite the arc-shaped Nd—Fe—B magnet, then pressing the first ceramic body and the magnet together; and
d) performing a thermally induced grain boundary diffusion process.-
公开(公告)号：US11062827B2
公开(公告)日：2021-07-13
申请号：US15401349
申请日：2017-01-09
发明人： Kaihong Ding , Zhongjie Peng , Guohai Wang , Xiulei Chen
IPC分类号： H01F41/02 , B22F3/16 , H01F1/057 , B22D11/00 , B22F1/00 , B22F3/24 , B22F9/04 , C21D6/00 , C21D9/00 , C22C38/00 , C22C38/06 , C22C38/10 , C22C38/16 , H01F1/058 , H01F1/059
摘要： A method of making a rare earth magnet containing zero heavy rare earth elements includes a step of mixing the fine grain powder with the lubricant having a weight content of at least 0.03 wt. % and no greater than 0.2 wt. % for a period of between 1 and 2 hours. The step of pulverizing is further defined as jet milling the alloy powder with the lubricant using a carrier gas of argon or nitrogen. The method further includes a step of controlling oxygen content during the steps of melting, forming, disintegrating, mixing, pulverizing, molding, and sintering whereby the impurities including Carbon (C), Oxygen (O), and Nitrogen (N) satisfies 1.2C+0.6O+N≤2800 ppm. A rare earth magnet composition including C, O, and N whereby C, O, and N satisfies 1.2C+0.6O+N≤2800 ppm and has zero heavy rare earth elements.
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7.发明授权公开(公告)号：US10978226B2
公开(公告)日：2021-04-13
申请号：US15588584
申请日：2017-05-05
发明人： Kaihong Ding , Zhongjie Peng , Guohai Wang , Xiulei Chen
IPC分类号： H01F1/057 , B22F9/04 , B22F3/24 , H01F41/02 , B22D11/00 , B22F3/04 , B22F3/16 , B22F9/02 , C21D6/00 , C21D9/00 , C22C38/00 , C22C38/06 , C22C38/10 , C22C38/14 , C22C38/16
摘要： A sintered Nd—Fe—B magnet comprising at least one light rare earth element having a weight content between 31 wt. % and 35 wt. %, at least one heavy rare earth element having a weight content of no more than 0.2 wt. %, B having a weight content between 0.95 wt. % and 1.2 wt. %, at least one additive including Ti and having a weight content between 1.31 wt. % and 7.2 wt. %, Fe as a balance, and impurities including C, O, and N. Ti has a weight content between 0.3 wt. % and 1 wt. % and forms a Titanium-Iron-Boron phase with Fe and Boron B and being present in the sintered Nd—Fe—B magnet between 0.86 vol. % and 2.85 vol. %. The C, O, and N satisfy 630 ppm≤1.2C+0.6O+N≤3680 ppm. The sintered Nd—Fe—B magnet has a squareness factor of at least 0.95.
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8.发明申请公开(公告)号：US20170372823A1
公开(公告)日：2017-12-28
申请号：US15588584
申请日：2017-05-05
发明人： Kaihong Ding , Zhongjie Peng , Guohai Wang , Xiulei Chen
IPC分类号： H01F1/057 , B22D11/00 , C22C38/10 , C22C38/06 , C22C38/00 , B22F9/04 , C21D6/00 , C22C38/14 , B22F3/04 , B22F3/16 , B22F3/24 , B22F9/02 , C22C38/16 , C21D9/00
CPC分类号： H01F1/0577 , B22D11/001 , B22F3/04 , B22F3/16 , B22F3/24 , B22F9/023 , B22F9/04 , B22F2003/248 , B22F2009/042 , B22F2009/044 , B22F2201/20 , B22F2202/05 , B22F2301/355 , B22F2998/10 , B22F2999/00 , C21D6/00 , C21D9/0068 , C22C38/002 , C22C38/005 , C22C38/06 , C22C38/10 , C22C38/14 , C22C38/16 , C22C2202/02 , H01F41/0253 , B22F1/0059 , B22F3/087 , B22F3/14 , B22F2201/02 , B22F2201/11
摘要： A sintered Nd—Fe—B magnet comprising at least one light rare earth element having a weight content between 31 wt. % and 35 wt. %, at least one heavy rare earth element having a weight content of no more than 0.2 wt. %, B having a weight content between 0.95 wt. % and 1.2 wt. %, at least one additive including Ti and having a weight content between 1.31 wt. % and 7.2 wt. %, Fe as a balance, and impurities including C, O, and N. Ti has a weight content between 0.3 wt. % and 1 wt. % and forms a Titanium-Iron-Boron phase with Fe and Boron B and being present in the sintered Nd—Fe—B magnet between 0.86 vol. % and 2.85 vol. %. The C, O, and N satisfy 630 ppm≦1.2C+0.6O+N≦3680 ppm. The sintered Nd—Fe—B magnet has a squareness factor of at least 0.95.
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公开(公告)号：US12027307B2
公开(公告)日：2024-07-02
申请号：US16953383
申请日：2020-11-20
发明人： Chuanshen Wang , Kunkun Yang , Zhongjie Peng , Daoning Jia , Kaihong Ding
CPC分类号： H01F41/0293 , H01F1/0577
摘要： The present disclosure provides a method for increasing the coercivity of a sintered type NdFeB permanent magnet. The method comprises:
a) coating of a slurry on a surface of the magnet, the slurry comprising
first particles consisting of a heavy rare earth alloy or a heavy rare earth or a non-metallic compound, and
second particles consisting of a metal alloy or a meta,
wherein at least one of the first particles and second particles includes at least one of Dy and Tb and wherein a ratio of the average particle diameter between the second particles and the first particles is 2:1 to 20:1;
b) performing a vibration of the coated magnet in vertical direction of the applied slurry with a vibration frequency of 10 Hz to 50 Hz for 30 s to 5 min, then drying the slurry; and
c) performing a thermally induced grain boundary diffusion process.-
10.发明申请公开(公告)号：US20190051435A1
公开(公告)日：2019-02-14
申请号：US16100107
申请日：2018-08-09
发明人： Kaihong Ding , Zhongjie Peng , Zhanji Dong , Xiulei Chen
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.
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