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公开(公告)号：US11996219B2
公开(公告)日：2024-05-28
申请号：US17478043
申请日：2021-09-17
发明人： Noritsugu Sakuma , Tetsuya Shoji , Akihito Kinoshita , Akira Kato
CPC分类号： H01F1/057 , H01F41/0253
摘要： A magnetic material according to the present disclosure includes a main phase having an R2T14B type crystal structure (R is a rare earth element and T is a transition metal element). The main phase has a composition represented by ((Nd, Pr)(1-x-y)LaxR1y))2((Fe(1-z-w)(Co, Ni)zMw))14B (where, R1 is a rare earth element other than Nd, Pr, and La, M is an element other than Fe, Co, Ni, and a rare earth element, and the like, and 0.25≤x≤1.00, 0≤y≤0.10, 0.15≤z≤0.40, and 0≤w≤0.1 are satisfied). A manufacturing method of the magnetic material according to the present disclosure includes melting a raw material containing the elements constituting the main phase and solidifying the melted raw material.
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公开(公告)号：US11721479B2
公开(公告)日：2023-08-08
申请号：US17000796
申请日：2020-08-24
发明人： Kazuya Yokota , Tetsuya Syoji , Noritsugu Sakuma , Takashi Miyake , Yosuke Harashima , Hisazumi Akai , Naoki Kawashima , Keiichi Tamai , Munehisa Matsumoto
CPC分类号： H01F41/026 , H01F1/053 , H01F41/0293
摘要： A rare earth magnet including a magnetic phase having the composition represented by (Nd(1−x−y)LaxCey)2(Fe(1−z)Coz)14B. When the saturation magnetization at absolute zero and the Curie temperature calculated by Kuzmin's formula based on the measured values at finite temperature and the saturation magnetization at absolute zero and the Curie temperature calculated by first principles calculation are respectively subjected to data assimilation. The saturation magnetization M(x, y, z, T=0) at absolute zero and the Curie temperature obtained by machine learning using the assimilated data group are applied again to Kuzmin's formula and the saturation magnetization at finite temperature is represented by a function M(x, y, z, T), x, y, and z of the formula in an atomic ratio are in a range of satisfying M(x, y, z, T)>M(x, y, z=0, T) and 400≤T≤453.
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公开(公告)号：US10325704B2
公开(公告)日：2019-06-18
申请号：US15380079
申请日：2016-12-15
发明人： Noritsugu Sakuma , Akira Kato , Masao Yano , Shunji Suzuki , Kurima Kobayashi
摘要： A rare earth magnet having a main phase and a sub-phase, wherein the main phase has a ThMn12-type crystal structure; the sub-phase contains at least any one of an Sm5Fe17-based phase, an SmCo5-based phase, an Sm2O3-based phase, and an Sm7Cu3-based phase; assuming that the volume of the rare earth magnet is 100%, the volume fraction of the sub-phase is from 2.3 to 9.5% and the volume fraction of an α-Fe phase is 9.0% or less; and the density of the rare earth magnet is 7.0 g/cm3 or more.
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公开(公告)号：US20240186036A1
公开(公告)日：2024-06-06
申请号：US18488076
申请日：2023-10-17
IPC分类号： H01F1/057
CPC分类号： H01F1/057
摘要： The R-T-B-based rare earth magnet 100 of the present disclosure includes a main phase 10 having an R2T14B-type crystal structure and a grain boundary phase 20. The average grain size of the main phase 10 is from 1.0 to 10,0 μm. The main phase 10 has a core portion 12 and a shell portion 14. The total content ratio of cerium, lanthanum, yttrium and scandium is higher in the core portion 12 than in the shell portion 14. The total content ratio of neodymium, praseodymium, gadolinium, terbium, dysprosium and holmium is higher in the shell portion 14 than in the core portion 12. The R-T-B-based rare earth magnet 100 contains from 0.05 to 0.50 at % of carbon. The content ratio of the carbon is higher in the grain boundary phase 20 than in the main phase 10.
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公开(公告)号：US11664140B2
公开(公告)日：2023-05-30
申请号：US17182993
申请日：2021-02-23
CPC分类号： H01F1/0577 , C22C38/005 , H01F1/058 , H01F41/0266 , H01F41/0293
摘要： A rare earth magnet includes a main phase and a particle boundary phase and in which an overall composition is represented by a formula, (R2(1-x)R1x)yFe(100-y-w-z-v)CowBzM1v.(R3(1-p)M2p)q.(R4(1-s)M3s)t, where R1 is a light rare earth element, R2 and R3 are a medium rare earth element, R4 is a heavy rare earth element, M1, M2, M3 are a predetermined metal element. The main phase includes a core portion, a first shell portion, and a second shell portion. The content proportion of medium rare earth element is higher in the first shell portion than in the core portion, the content proportion of medium rare earth element is lower in the second shell portion than in the first shell portion. The second shell portion contains heavy rare earth elements.
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公开(公告)号：US11522420B2
公开(公告)日：2022-12-06
申请号：US16811811
申请日：2020-03-06
摘要： A method of producing a motor core includes preparing a soft magnetic plate containing a transition metal element, preparing a modifying member containing an alloy having a melting point lower than a melting point of the soft magnetic plate, bringing the modifying member into contact with a part of a plate surface of the soft magnetic plate, causing the modifying member to diffuse and penetrate into the soft magnetic plate from a contact surface between the soft magnetic plate and the modifying member and forming a hard magnetic phase-containing part in a part of the soft magnetic plate, and laminating a plurality of soft magnetic plates on each other after the modifying member is brought into contact with the part of the plate surface of the soft magnetic plate.
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公开(公告)号：US10937577B2
公开(公告)日：2021-03-02
申请号：US15233362
申请日：2016-08-10
发明人： Noritsugu Sakuma , Masao Yano , Akira Kato , Akira Manabe , Shunji Suzuki , Kurima Kobayashi
摘要： A magnetic compound represented by the formula (R1(1-x)R2x)a(Fe(1-y)Coy)bTcMd wherein R1 is one or more elements selected from the group consisting of Sm, Pm, Er, Tm and Yb, R2 is one or more elements selected from the group consisting of Zr, La, Ce, Pr, Nd, Eu, Gd, Tb, Dy, Ho and Lu, T is one or more elements selected from the group consisting of Ti, V, Mo, Si and W, M is one or more elements selected from the group consisting of unavoidable impurity elements, Al, Cr, Cu, Ga, Ag and Au, 0≤x≤0.7, 0≤y≤0.7, 4≤a≤20, b=100-a-c-d, 0
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公开(公告)号：US10424426B2
公开(公告)日：2019-09-24
申请号：US14896215
申请日：2014-06-05
发明人： Masaaki Ito , Masao Yano , Hidefumi Kishimoto , Noritsugu Sakuma , Tetsuya Shoji , Akira Manabe
摘要： To provide a rare earth magnet ensuring excellent magnetic anisotropy while reducing the amount of Nd, etc., and a manufacturing method thereof.A rare earth magnet comprising a crystal grain having an overall composition of (R2(1-x)R1x)yFe100-y-w-z-vCowBzTMv (wherein R2 is at least one of Nd, Pr, Dy and Tb, R1 is an alloy of at least one or two or more of Ce, La, Gd, Y and Sc, TM is at least one of Ga, Al, Cu, Au, Ag, Zn, In and Mn, 0
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公开(公告)号：US10351935B2
公开(公告)日：2019-07-16
申请号：US14844478
申请日：2015-09-03
发明人： Noritsugu Sakuma , Akira Kato , Kota Washio , Hidefumi Kishimoto , Masao Yano , Akira Manabe , Masaaki Ito , Shunji Suzuki , Kurima Kobayashi
摘要： Provided is a magnetic compound represented by the formula (R(1-x)Zrx)a(Fe(1-y)Coy)bTcMdAe (wherein R represents one or more rare earth elements, T represents one or more elements selected from the group consisting of Ti, V, Mo, and W, M represents one or more elements selected from the group consisting of unavoidable impurity elements, Al, Cr, Cu, Ga, Ag, and Au, A represents one or more elements selected from the group consisting of N, C, H, and P, 0≤x≤0.5, 0≤y≤0.6, 4≤a≤20, b=100−a−c−d, 0
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公开(公告)号：US11476020B2
公开(公告)日：2022-10-18
申请号：US16013101
申请日：2018-06-20
摘要： To provide a rare earth magnet having excellent coercive force and a production method thereof. A rare earth magnet, wherein the rare earth magnet comprises a magnetic phase containing Sm, Fe, and N, a Zn phase present around the magnetic phase, and an intermediate phase present between the magnetic phase and the Zn phase, wherein the intermediate phase contains Zn and the oxygen content of the intermediate phase is higher than the oxygen content of the Zn phase; and a method for producing a rare earth magnet, including mixing a magnetic raw material powder having an oxygen content of 1.0 mass % or less and an improving agent powder containing metallic Zn and/or a Zn alloy, and heat-treating the mixed powder.
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