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1. 发明公开

EP4287220A1 METHOD OF PREPARING A NDFEB MAGNET AND A NDFEB MAGNET OBTAINED THEREBY 审中-实审
公开(公告)号：EP4287220A1
公开(公告)日：2023-12-06
申请号：EP23176222.0
申请日：2023-05-30
申请人： Yantai Dongxing Magnetic Materials Inc.
发明人： Chuanshen, Wang , Zhongjie, Peng , Kunkun, Yang , Zhanji, Dong , Kaihong, Ding
IPC分类号： H01F1/057 , H01F41/02
摘要： The present invention provides a method of preparing a NdFeB magnet comprises the following steps:
(S1) providing a diffusion source alloy of chemical formula R α M β B γ F 100-α-β-γ , wherein 10≤α≤80, 15≤β≤90, 0.1≤γ≤3, R is at least one of Nd and Pr, and M is at least one of Al, Cu, and Ga;
(S2) providing a sintered NdFeB magnet; and
(S3) applying the diffusion source alloy on the surface of the sintered NdFeB magnet and performing a thermal diffusion process.

2. 发明公开

EP4216239A1 A SINTERED NDFEB PERMANENT MAGNET AND PREPARATION METHOD THEREOF 审中-实审
公开(公告)号：EP4216239A1
公开(公告)日：2023-07-26
申请号：EP23152120.4
申请日：2023-01-18
申请人： Yantai Dongxing Magnetic Materials Inc.
发明人： Xiang, Chunjie , Peng, Zhongjie , Zhu, Xiaonan , Ding, Kaihong
IPC分类号： H01F1/057 , H01F41/02
摘要： The invention discloses a NdFeB permanent magnet and a preparation method thereof. The magnet is composed of main phase I, a shell structure, a grain boundary phase adjacent to the shell structure, a main phase II, a Ga rich region and a Cu rich region. The magnet has high remanence, high coercivity, and high magnetic energy. In addition, this method can significantly reduce the production cost.

3. 发明公开

EP4152349A1 METHOD FOR PREPARING NDFEB MAGNETS INCLUDING LANTHANUM OR CERIUM 无效
公开(公告)号：EP4152349A1
公开(公告)日：2023-03-22
申请号：EP22193682.6
申请日：2022-09-02
申请人： Yantai Dongxing Magnetic Materials Inc.
发明人： Chen, Xiulei , Peng, Zhongjie , Dong, Zhanji , Ding, Kaihong
IPC分类号： H01F1/057 , H01F41/02
摘要： According to the present invention, there is provided a method for preparing (sintered type) NdFeB magnets including at least one of Ce and La. The method includes the following steps:
S1) Separately preparing flakes of alloy R1 and flakes of alloy R2 each by a strip casting process, wherein the alloy R1 includes at least one of La and Ce, but the alloy R2 does not include La and Ce;
S2) separately subjecting the flakes of alloy R1 and the flakes of alloy R2 to a hydrogen embrittlement process followed by pulverizing the process product to alloy powders by jet milling, wherein a ratio of the average particle sizes D50 of the powder of alloy R1 and the powder of alloy R2 satisfied formula: 0.32 ≤ R2 /R1 ≤ 0.66;
S3) mixing the powder of alloy R1 and the powder of alloy R2; and
S4) subjecting the mixed powders to molding and magnetic field orientation, cold isostatic pressing, sintering, and an annealing process.

4. 发明公开

EP4354475A1 METHOD FOR IMPROVING THE COERCIVITY OF A NEODYMIUM-IRON-BORON MAGNET AND MAGNET OBTAINED BY THE METHOD 审中-实审
公开(公告)号：EP4354475A1
公开(公告)日：2024-04-17
申请号：EP23202376.2
申请日：2023-10-09
申请人： Yantai Dongxing Magnetic Materials Inc.
发明人： Yang, Kunkun , Peng, Zhongjie , Wang, Chuanshen , Ding, Kaihong
IPC分类号： H01F41/02 , H01F1/057
CPC分类号： H01F1/0577 , H01F41/0293
摘要： The present disclosure relates to the technical field of neodymium-iron-boron preparation, in particular to a method for improving the coercivity of a neodymium-iron-boron magnet and a magnet prepared by the method. The method specifically includes: (S1) subjecting a heavy rare earth diffusion source powder, an organic adhesive, a spherical high-temperature resistant ceramic powder and an organic solvent to mixing and stirring to prepare a heavy rare earth slurry; (S2) coating a surface of a neodymium-iron-boron magnet with the heavy rare earth slurry and drying the heavy rare earth slurry to form a heavy rare earth coating; and (S3) performing high-temperature diffusion and aging treatment. According to the method above, the heavy rare earth coating has high hardness and strength. In addition, the neodymium-iron-boron magnet has higher and more uniform properties after diffusion, and less heavy rare earth elements are consumed.

5. 发明公开

EP4156213A1 A HIGH TEMPERATURE RESISTANT MAGNET AND A METHOD THEREOF 审中-公开
公开(公告)号：EP4156213A1
公开(公告)日：2023-03-29
申请号：EP22190798.3
申请日：2022-08-17
申请人： Yantai Dongxing Magnetic Materials Inc.
发明人： Wang, Chuanshen , Peng, Zhongjie , Yang, Kunkun , Ding, Kaihong
IPC分类号： H01F41/02 , H01F1/057
摘要： The invention relates to the technical field of sintered type NdFeB permanent magnets, in particular to a high temperature resistant magnet. There is provided a preparation method for the magnet including a step of preparing a mixture of the NdFeB alloy flakes and a low melting point powder, wherein the low melting point powder comprises at least one of NdCu, NdAI and NdGa.

6. 发明公开

EP4340182A1 PERMANENT MAGNET FOR LOW EDDY CURRENT LOSS OF PERMANENT MAGNET MOTOR AND PERMANENT MAGNET MOTOR 审中-实审
公开(公告)号：EP4340182A1
公开(公告)日：2024-03-20
申请号：EP22806772.4
申请日：2022-05-10
申请人： Yantai Dongxing Magnetic Materials Inc.
发明人： PENG, Zhongjie , LI, Xiaoqun , LIANG, Feng , DING, Kaihong
IPC分类号： H02K1/27 , H02K1/28 , H02K15/03
摘要： The present invention falls in the field of permanent magnet motors, relates to a permanent magnet with low eddy current loss for a permanent magnet motor and a permanent magnet motor having such a permanent magnet. Permanent magnets include a first pole surface, a second pole surface, four side surfaces, and a plurality of embedded electrical insulation layers. The first pole surface is basically orthogonal to the magnetization direction of the permanent magnet, and the second pole surface is parallel to the first pole surface, a plurality of embedded electrical insulation layers are parallel to the magnetization direction of the permanent magnet, and at least one edge of each electrical insulation layer is neither parallel nor perpendicular to the magnetization direction of the permanent magnet. The electrical insulation layer in the permanent magnet is located in the area with high eddy current loss of the permanent magnet, which reduces the magnetic flux loss caused by the introduction of the embedded electrical insulation layer, avoids the increase of cost to a certain extent and plays a role in reducing the eddy current loss.

7. 发明公开

EP4332998A1 CE-CONTAINING SINTERED NDFEB MAGNET AND MANUFACTURING METHOD THEREOF 审中-实审
公开(公告)号：EP4332998A1
公开(公告)日：2024-03-06
申请号：EP23193064.5
申请日：2023-08-23
申请人： Yantai Dongxing Magnetic Materials Inc.
发明人： Chen, Xiulei , Peng, Zhongjie , Dong, Zhanji , Ding, Kaihong , Xu, Xiandong
IPC分类号： H01F1/057 , H01F41/02
摘要： The present invention relates to a Ce-containing and sintered NdFeB magnet and a corresponding manufacturing method thereof. The Ce-containing and sintered NdFeB magnet comprises grains composed of a RE 2 Fe 14 B-type main phase and a multi-layered grain boundary structure between the grains. The multi-layered grain boundary structure includes or consists of - from outside to inside of the multi-layered grain boundary structure and in direct order - layers composed of (or consisting of) the following phases: a RE-rich phase, a Fe-rich phase, and a REFe 2 phase. RE is a rare earth metal including Ce and at least one of Nd and Pr. A weigh content of Ce at the magnet alloy composition (i.e. the sum of all elements forming the alloy of the sintered NdFeB magnet) is in the rage of 3.00wt.% to 15.00wt.%.

8. 发明公开

EP4287227A1 DIFFUSION SOURCE MATERIAL AND ITS USE FOR PREPARATION OF NDFEB MAGNETS 审中-实审
公开(公告)号：EP4287227A1
公开(公告)日：2023-12-06
申请号：EP23174413.7
申请日：2023-05-22
申请人： Yantai Dongxing Magnetic Materials Inc.
发明人： WANG, Chuanshen , PENG, Zhongjie , YANG, Kunkun , DONG, Zhanji , DING, Kaihong
IPC分类号： H01F41/02 , H01F1/057
摘要： The invention relates to the technical field of NdFeB rare earth magnets, in particular to rare earth magnets with improved coercivity and its manufacturing method thereof. The invention further refers to a method of preparing a diffusion source material useful for preparing the NdFeB magnets.

9. 发明公开

EP4156214A1 A LOW-HEAVY RARE EARTH MAGNET AND MANUFACTURING METHOD 审中-公开
公开(公告)号：EP4156214A1
公开(公告)日：2023-03-29
申请号：EP22194858.1
申请日：2022-09-09
申请人： Yantai Dongxing Magnetic Materials Inc.
发明人： Wang, Chuanshen , Peng, Zhongjie , Yang, Kunkun , Ding, Kaihong
IPC分类号： H01F41/02 , H01F1/057
摘要： The invention relates to a method of preparing a sintered NdFeB magnet comprising the following steps:
(S1) Smelting of the raw materials of a NdFeB alloy to obtain strip casting NdFeB alloy sheets and mechanically crushing the NdFeB alloy sheets into flake alloy sheets, wherein the NdFeB alloy has the following composition in weight percentage: 28%≤R≤30%, 0.8%≤B≤1.2%, 0≤Gd≤5%, 0≤Ho≤5%, and 0≤M≤3%, where R is at least one element of Nd, Pr, Ce, La, Tb, and Dy, M is at least one element of Co, Mg, Ti, Zr, Nb, and Mo, and the rest of the NdFeB alloy is Fe;
(S2) Mechanically mixing the flake alloy sheets, a low melting point powder and a lubricant, followed by hydrogen absorption and dehydrogenation treatment of the mixture and jet milling of the product to obtain a NdFeB magnet powder, wherein the low melting point powder contains at least one component selected form NdCu, NdAI and NdGa and a weight percentage of the components is 0%≤NdCu≤3%, 0%≤NdAl≤3%, and 0%≤NdGa≤3% with respect to the total weight of the flake alloy sheets and the low melting point powder;
(S3) Pressing and forming the NdFeB powder to a blank and sintering the blank to obtain a sintered NdFeB magnet;
(S4) Mechanically processing the sintered NdFeB magnet to a desired shape, and then forming a diffusion source film on the surface of the sintered NdFeB magnet, wherein diffusion source film includes a diffusion source of formula R x H y M 1-x-y , wherein R is at least one of Nd, Pr, Ce, La, Ho, and Gd, H is at least one of Tb and Dy, M is at least one of Al, Cu, Ga, Ti, Co, Mg, Zn, and Sn, and where x and y are set to be 10%
(S5) Performing a diffusion process and aging to obtain the final the sintered NdFeB magnet.

10. 发明公开

EP4156210A1 A LOW-COST RARE EARTH MAGNET AND CORRESPONDING MANUFACTURING METHOD THEREOF 审中-公开
公开(公告)号：EP4156210A1
公开(公告)日：2023-03-29
申请号：EP22197058.5
申请日：2022-09-22
申请人： Yantai Dongxing Magnetic Materials Inc.
发明人： Wang, Chuanshen , Yang, Kunkun , Peng, Zhongjie , Ding, Kaihong
IPC分类号： H01F1/057 , H01F41/02
摘要： The invention relates to the technical field of sintered type NdFeB permanent magnets, in particular to a low-cost rare earth magnet and manufacturing method. There is provided a method of preparing a high-coercivity sintered NdFeB magnet including cerium comprising the following steps:
(S1) Providing alloy flakes composed of R x T (1-x-y-z) B y M z wherein R is at least one of Nd, Pr, Ho, and Gd; T is at least one of Fe and Co; and M is at least one of Mg, Ti, Zr, Nb, and Mo; and x, y, and z are 28.0wt% ≤ x ≤ 33.0wt%, 0.8wt% ≤ y ≤ 1.2wt%, and 0wt% ≤ z ≤ 3.0wt%;
(S2) Mixing the alloy flakes, a low melting point powder, and a lubricant, then subjecting the mixture to a hydrogen embrittlement process followed in this order by pulverizing the process product to an alloy powder by jet milling, magnetic field orientation molding of the alloy powder to obtain a blank, sintering and aging treatment the blank, and cutting the obtained sintered NdFeB magnet into the desired shape, wherein the low melting point powder is at least one of Ce α Al 100-α with 90≤α≤99, Ce β Cu 1-β with 80≤β≤99, and Ce γ Ga 1-γ with 80≤γ≤99 and wherein a content of the Ce in the mixture is in the range of 1 to 10 wt% based on a total weight of the alloy flakes and the low melting point powder;
(S3) Coating a film composed of a diffusion source of formula R1 x R2 y H z M 1-x-y-z on the sintered NdFeB magnet, wherein R1 is at least one element of Nd and Pr; R2 is at least one element of Ho and Gd; H is at least one element of Tb and Dy; M is at least two elements of Al, Cu, Ga, Ti, Co, Mg, Zn, and Sn; and x, y, and z are 5.0wt%
(S4) Performing a diffusion heat treatment so as to diffuse the diffusion source into the sintered NdFeB magnet, followed by aging the sintered NdFeB magnet to obtain the low-cost rare earth magnet.

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