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1. 发明授权

US11107627B2 Method and an apparatus for manufacturing an R-Fe-B sintered magnet 有权
公开(公告)号：US11107627B2
公开(公告)日：2021-08-31
申请号：US16236926
申请日：2018-12-31
申请人： Yantai Shougang Magnetic Materials, Inc.
发明人： Zhongjie Peng , Xiaotong Liu
IPC分类号： H01F41/02 , H01F1/057 , C23C4/134 , C23C4/02 , C23C4/08 , C23C4/18
摘要： A method of manufacturing a plurality of R—Fe—B sintered magnets using a plasma flame apparatus and a furnace. The method includes a first step of providing a sintered magnet block. Then, the sintered magnet block is machined to form machined magnets. The method continues with a step of cleaning surfaces of the machined magnets to form cleaned magnets. The method then proceeds with depositing a plurality of spherical droplets of a heavy rare earth powder selected from at least one of Dy or Tb on the surfaces of the cleaned magnets, to produce a plurality of magnets including a uniform film of Dy or Tb. Then, the magnets including the uniform film are sintered to diffuse the uniform film into the magnets through grain boundary phases of the magnets to produce the R—Fe—B sintered magnets. A plasma flame apparatus is also disclosed herein.

2. 发明授权

US11062827B2 Sintered magnet composition without heavy rare earth element and a method of making the sintered magnet 有权
公开(公告)号：US11062827B2
公开(公告)日：2021-07-13
申请号：US15401349
申请日：2017-01-09
申请人： Yantai Shougang Magnetic Materials, Inc.
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.

3. 发明申请

US20210166847A1 MANUFACTURING METHOD OF SINTERED ND-FE-B PERMANENT MAGNET 有权
公开(公告)号：US20210166847A1
公开(公告)日：2021-06-03
申请号：US17105537
申请日：2020-11-26
申请人： Yantai Shougang Magnetic Materials Inc
发明人： Chunjie XIANG , Zhongjie PENG , Xiulei CHEN , Xiaonan ZHU , Qiang ZHANG , Kaihong DING
IPC分类号： H01F1/057 , B22F1/00 , B22F3/12 , B22F9/04 , C22C38/00 , C22C38/10 , C22C38/06 , C22C38/14 , H01F41/02
摘要： The present disclosure refers to a preparation method for improving the coercive force of a sintered Nd—Fe—B magnet and comprises: preparing Nd—Fe—B alloy flakes by a strip casting process, followed by hydrogen decrepitation of the Nd—Fe—B alloy flakes and jet milling to obtain an Nd—Fe—B powder; mixing Nd—Fe—B powder and an amount of 0.1 to 5 wt. % of a nanoparticulate powder in a powder mixing machine to obtain a powder mixture; modification of the powder mixture obtained in step B) under inert conditions in a mechanical mixing equipment such that the particles of the Nd—Fe—B powder are rounded and the nanoparticulate powder adheres to the particle surface of the Nd—Fe—B powder; mixing in a lubricant to the modified Nd—Fe—B powder in a powder mixing machine; and align pressing the modified Nd—Fe—B powder into a green body, sintering the green body, and aging of the obtained sintered Nd—Fe—B magnet.

4. 发明授权

US10978226B2 Sintered Nd—Fe—B magnet composition and a production method for the sintered Nd—Fe—B magnet 有权
公开(公告)号：US10978226B2
公开(公告)日：2021-04-13
申请号：US15588584
申请日：2017-05-05
申请人： Yantai Shougang Magnetic Materials, Inc.
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.

5. 发明申请

US20190206618A1 METHOD AND AN APPARATUS FOR MANUFACTURING AN R-FE-B SINTERED MAGNET 审中-公开
公开(公告)号：US20190206618A1
公开(公告)日：2019-07-04
申请号：US16236926
申请日：2018-12-31
申请人： Yantai Shougang Magnetic Materials, Inc.
发明人： Zhongjie Peng , Xiaotong Liu
IPC分类号： H01F41/02 , H01F1/057 , C23C4/134 , C23C4/08 , C23C4/18 , C23C4/02
CPC分类号： H01F41/0293 , C23C4/02 , C23C4/08 , C23C4/134 , C23C4/18 , H01F1/0577
摘要： A method of manufacturing a plurality of R—Fe—B sintered magnets using a plasma flame apparatus and a furnace. The method includes a first step of providing a sintered magnet block. Then, the sintered magnet block is machined to form machined magnets. The method continues with a step of cleaning surfaces of the machined magnets to form cleaned magnets. The method then proceeds with depositing a plurality of spherical droplets of a heavy rare earth powder selected from at least one of Dy or Tb on the surfaces of the cleaned magnets, to produce a plurality of magnets including a uniform film of Dy or Tb. Then, the magnets including the uniform film are sintered to diffuse the uniform film into the magnets through grain boundary phases of the magnets to produce the R—Fe—B sintered magnets. A plasma flame apparatus is also disclosed herein.

6. 发明申请

US20170372823A1 SINTERED ND-FE-B MAGNET COMPOSITION AND A PRODUCTION METHOD FOR THE SINTERED ND-FE-B MAGNET 审中-公开
公开(公告)号：US20170372823A1
公开(公告)日：2017-12-28
申请号：US15588584
申请日：2017-05-05
申请人： Yantai Shougang Magnetic Materials, Inc.
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.

7. 发明申请

US20160125985A1 Method Of Preparing A Hard Aluminum Film On The Surface Of A ND-FE-B Magnet 审中-公开
标题翻译：在ND-FE-B磁体表面制备硬铝膜的方法
公开(公告)号：US20160125985A1
公开(公告)日：2016-05-05
申请号：US14931035
申请日：2015-11-03
申请人： Yantai Shougang Magnetic Materials Inc.
发明人： Kunkun Yang , Zhongjie Peng
IPC分类号： H01F1/057 , C23C14/35 , C23C14/24 , C25D11/04 , C23C14/32
CPC分类号： H01F1/057 , C23C14/16 , C23C14/24 , C23C14/325 , C23C14/35 , C23C14/5853 , C25D11/04 , H01F41/026
摘要： The present invention provides a Nd—Fe—B magnet including a first film of aluminum having a first predetermined hardness and an anti-corrosive coating of oxidized aluminum having a second predetermined hardness on the first film. The second predetermined hardness is at least eight times the first predetermined hardness. The present invention also provides a method for preparing a hard aluminum film on the Nd—Fe—B magnet. The method includes depositing the first film on the Nd—Fe—B magnet under vacuum, disposing the Nd—Fe—B magnet having the first film on the anode, and subjecting the Nd—Fe—B magnet having the first film to the anodic oxidation process under a solution containing an electrolyte present between 15 wt. % to 20 wt. % to form the anti-corrosive coating on the first film to prevent the Nd—Fe—B magnet from corroding. The electrolyte is selected from at least one of sulfuric acid, chromic acid, boric acid, and oxalic acid.
摘要翻译：本发明提供一种Nd-Fe-B磁体，其包括具有第一预定硬度的铝的第一膜和在第一膜上具有第二预定硬度的氧化铝的防腐蚀涂层。第二预定硬度是第一预定硬度的至少八倍。本发明还提供了在Nd-Fe-B磁体上制备硬质铝膜的方法。该方法包括在真空下在Nd-Fe-B磁体上沉积第一膜，将具有第一膜的Nd-Fe-B磁体置于阳极上，并将具有第一膜的Nd-Fe-B磁体置于阳极在含有电解质的溶液下，在15wt。％至20重量％％以在第一层膜上形成防腐涂层，以防止Nd-Fe-B磁体腐蚀。电解质选自硫酸，铬酸，硼酸和草酸中的至少一种。

8. 发明申请

US20210166870A1 METHOD FOR INCREASING THE COERCIVITY OF A SINTERED TYPE NDFEB PERMANENT MAGNET 有权
公开(公告)号：US20210166870A1
公开(公告)日：2021-06-03
申请号：US16953383
申请日：2020-11-20
申请人： Yantai Shougang Magnetic Materials Inc
发明人： Chuanshen WANG , Kunkun YANG , Zhongjie PENG , Daoning JIA , Kaihong DING
IPC分类号： H01F41/02 , H01F1/057
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.

9. 发明申请

US20190156974A1 ND-FE-B MAGNET INCLUDING A COMPOSITE COATING DISPOSED THEREON AND A METHOD OF DEPOSITING A COMPOSITE COATING ON THE ND-FE-B MAGNET 审中-公开
公开(公告)号：US20190156974A1
公开(公告)日：2019-05-23
申请号：US16194193
申请日：2018-11-16
申请人： Yantai Shougang Magnetic Materials, Inc.
发明人： Changbo Xie , Dejin Chen
IPC分类号： H01F1/057 , H01F41/02
摘要： An Nd—Fe—B magnet includes a magnet body and a composite coating of metal disposed on the body. The compositing coating has a plurality of plating layers disposed on the magnet body to cover and protect the magnet body and improve corrosion resistance of the magnet body. The plating layers include a first, a second, a third, and a fourth plating layers to cover the magnet body. The first plating layer contains Zn. The second plating layer contains a Zinc-Nickel alloy. The third plating layer contains Copper. The fourth plating layer contains Nickel. A method of depositing on a composite layer on an Nd—Fe—B magnet body.

10. 发明申请

US20180040398A9 Method Of Preparing A Hard Aluminum Film On The Surface Of A ND-FE-B Magnet 审中-公开
公开(公告)号：US20180040398A9
公开(公告)日：2018-02-08
申请号：US14931035
申请日：2015-11-03
申请人： Yantai Shougang Magnetic Materials Inc.
发明人： Kunkun Yang , Zhongjie Peng
IPC分类号： H01F1/057 , C23C14/35 , C23C14/24 , C25D11/04 , C23C14/32
CPC分类号： H01F1/057 , C23C14/16 , C23C14/24 , C23C14/325 , C23C14/35 , C23C14/5853 , C25D11/04 , H01F41/026
摘要： The present invention provides a Nd—Fe—B magnet including a first film of aluminum having a first predetermined hardness and an anti-corrosive coating of oxidized aluminum having a second predetermined hardness on the first film. The second predetermined hardness is at least eight times the first predetermined hardness. The present invention also provides a method for preparing a hard aluminum film on the Nd—Fe—B magnet. The method includes depositing the first film on the Nd—Fe—B magnet under vacuum, disposing the Nd—Fe—B magnet having the first film on the anode, and subjecting the Nd—Fe—B magnet having the first film to the anodic oxidation process under a solution containing an electrolyte present between 15 wt. % to 20 wt. % to form the anti-corrosive coating on the first film to prevent the Nd—Fe—B magnet from corroding. The electrolyte is selected from at least one of sulfuric acid, chromic acid, boric acid, and oxalic acid.

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