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公开(公告)号：US11495376B2
公开(公告)日：2022-11-08
申请号：US16612294
申请日：2018-06-20
发明人： Yang Luo , Hongbin Zhang , Zhou Hu , Dunbo Yu , Ningtao Quan , Yuanfei Yang , Wenlong Yan , Jiajun Xie
摘要： The present invention discloses rare earth-bonded magnetic powder and a preparation method therefor. The bonded magnetic powder is of a multilayer core-shell structure, and comprises a core layer and an antioxidant layer (3), wherein the core layer is formed by RFeMB, R is Nd and/or PrNd, and M is one or more of Co, Nb, and Zr; and the core layer is coated with an iron-nitrogen layer (2). In addition, the present invention also discloses the preparation method for the rare earth-bonded magnetic powder and a bonded magnet. The oxidation and corrosion of magnetic raw powder during phosphorization and subsequent treatment process are effectively prevented, thereby further improving the long-term temperature resistance and environmental tolerance of the material.
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公开(公告)号：US11987868B2
公开(公告)日：2024-05-21
申请号：US17090703
申请日：2020-11-05
发明人： Yang Luo , Zilong Wang , Yuanfei Yang , Zhou Hu , Dunbo Yu , Jiajun Xie , Yifan Liao , Zhongkai Wang
CPC分类号： C22C38/005 , B22F1/142 , B22F9/04 , C22C1/1084 , H01F1/0576 , B22F2009/041 , B22F2201/013 , B22F2201/20 , B22F2301/355 , C22C2202/02
摘要： A method for preparing a rare earth anisotropic bonded magnetic powder, comprises the following steps: (1) preparing raw powder with RTBH as the main component, wherein, R is Nd or Pr/Nd, and T is a transition metal containing Fe; (2) adding La hydride or Ce hydride and copper powder to the raw powder to form a mixture; (3) subjecting the mixture to atmosphere diffusion heat treatment to give the rare earth anisotropic bonded magnetic powder.
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公开(公告)号：US20210134499A1
公开(公告)日：2021-05-06
申请号：US17090710
申请日：2020-11-05
发明人： Yang Luo , Zhongkai Wang , Yuanfei Yang , Zilong Wang , Dunbo Yu , Yifan Liao , Jiajun Xie , Zhou Hu
摘要： The invention discloses a composite rare earth anisotropic bonded magnet and a preparation method thereof. The composite rare earth anisotropic bonded magnet comprises a Nd—Fe—B magnetic powder, a Sm—Fe—N magnetic powder, a binder and an inorganic nano-dispersant. The preparation method comprises steps of preparing a Nd—Fe—B magnetic powder by a HDDR method, preparing a Sm—Fe—N magnetic powder by a powder metallurgy method, mixing the Nd—Fe—B magnetic powder, the Sm—Fe—N magnetic powder, the binder and the inorganic nano-dispersant at a specific ratio to finally obtain the composite rare earth anisotropic bonded magnet. The invention, by adding an inorganic nano-dispersant, enables the full dispersion of the fine Sm—Fe—N powder during the mixing process of the binder, the Nd—Fe—B magnetic powder and the Sm—Fe—N powder, and thus makes the fine Sm—Fe—N powder and the binder evenly coated on the surface of the anisotropic Nd—Fe—B magnetic powder.
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公开(公告)号：US11981983B2
公开(公告)日：2024-05-14
申请号：US17090710
申请日：2020-11-05
发明人： Yang Luo , Zhongkai Wang , Yuanfei Yang , Zilong Wang , Dunbo Yu , Yifan Liao , Jiajun Xie , Zhou Hu
CPC分类号： C22C33/0257 , B22F1/05 , B22F1/065 , B22F1/102 , H01F1/0578 , H01F1/059 , H01F41/0266 , B22F2301/355 , B22F2304/10 , B22F2998/10 , B22F1/10 , B22F3/02 , B22F2998/10 , B22F1/10 , B22F3/20 , B22F2998/10 , B22F1/10 , B22F3/225 , B22F2998/10 , B22F1/10 , B22F3/18
摘要： The invention discloses a composite rare earth anisotropic bonded magnet and a preparation method thereof. The composite rare earth anisotropic bonded magnet comprises a Nd—Fe—B magnetic powder, a Sm—Fe—N magnetic powder, a binder and an inorganic nano-dispersant. The preparation method comprises steps of preparing a Nd—Fe—B magnetic powder by a HDDR method, preparing a Sm—Fe—N magnetic powder by a powder metallurgy method, mixing the Nd—Fe—B magnetic powder, the Sm—Fe—N magnetic powder, the binder and the inorganic nano-dispersant at a specific ratio to finally obtain the composite rare earth anisotropic bonded magnet. The invention, by adding an inorganic nano-dispersant, enables the full dispersion of the fine Sm—Fe—N powder during the mixing process of the binder, the Nd—Fe—B magnetic powder and the Sm—Fe—N powder, and thus makes the fine Sm—Fe—N powder and the binder evenly coated on the surface of the anisotropic Nd—Fe—B magnetic powder.
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公开(公告)号：US11802326B2
公开(公告)日：2023-10-31
申请号：US17331531
申请日：2021-05-26
发明人： Yang Luo , Yuanfei Yang , Zilong Wang , Dunbo Yu , Hongbin Zhang , Jiajun Xie , Zhou Hu , Zhongkai Wang
CPC分类号： C22C38/002 , B22F1/102 , B22F7/062 , C22C38/005 , H01F1/0558 , H01F1/0576 , H01F1/0578 , H01F41/0266 , B22F2202/05 , B22F2301/355 , C22C2202/02 , B22F2998/10 , B22F1/10 , B22F3/02 , B22F2003/248
摘要： An anisotropic bonded magnet and a preparation method thereof are provided. By stacking magnets having different magnetic properties and/or densities, the magnets in the middle have high properties and the magnets at two ends and/or the periphery have low properties, thereby compensating for a property deviation caused by a difference in pressing densities during a pressing process, and improving the property uniformity of the magnets in an axial direction. The method solves the problem of “low in the middle and high at two ends” caused by the phenomenon of non-uniform magnetic field orientation and density along a height direction during orientation and densification.
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公开(公告)号：US20210130939A1
公开(公告)日：2021-05-06
申请号：US17090699
申请日：2020-11-05
发明人： Yang Luo , Zhongkai Wang , Yuanfei Yang , Zilong Wang , Dunbo Yu , Yifan Liao , Jiajun Xie , Zhou Hu
摘要： The invention discloses an anisotropic bonded magnetic powder and a preparation method thereof. The anisotropic bonded magnetic powder has a general formula of R1R2TB, wherein R1 is a rare earth element containing Nd or PrNd, R2 is one or two of La and Ce, T is a transitional element, and B is boron. The preparation method includes the steps of smelting the master alloy to prepare ingot(s), preparing a rare earth hydride of formula R1TBHX, preparing a hydride diffusion source of formula R1R2THX, mixing, heat treating, and high-vacuum dehydrogenating, to obtain the anisotropic bonded magnetic powder. The invention uses La and Ce hydrides as the diffusion source, can save cost, remove hydrogen from the diffusion source at a lower dehydrogenation temperature, avoid crystal grain growth at a high temperature, and ensure the quality of the product.
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