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公开(公告)号：US10937578B2
公开(公告)日：2021-03-02
申请号：US15710341
申请日：2017-09-20
发明人： Tetsuya Ohashi , Tetsuya Kume , Koichi Hirota , Hajime Nakamura
摘要： An R—Fe—B base sintered magnet is prepared through the steps of providing an alloy fine powder having a predetermined composition, compression shaping the alloy fine powder in an applied magnetic field into a compact, sintering the compact at a temperature of 900-1,250° C. into a sintered body, cooling the sintered body to 400° C. or below, high-temperature heat treatment including placing a metal, compound or intermetallic compound containing HR which is Dy, Tb and/or Ho, on the surface of the sintered body, heating at a temperature from more than 950° C. to 1,100° C., for causing grain boundary diffusion of HR into the sintered body, and cooling to 400° C. or below, and low-temperature heat treatment including heating at a temperature of 400-600° C. and cooling to 300° C. or below. The sintered magnet produces a high coercivity despite a low content of Dy, Tb and Ho.
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公开(公告)号：US10074477B2
公开(公告)日：2018-09-11
申请号：US15375655
申请日：2016-12-12
发明人： Hiroaki Nagata , Yuuji Gouki , Kazuaki Sakaki , Tadao Nomura , Koichi Hirota , Hajime Nakamura
IPC分类号： H01F1/057 , H01F41/02 , H01F1/053 , B22F3/10 , B22F3/26 , C22C38/60 , C22C38/20 , C22C38/16 , C22C38/14 , C22C38/12 , C22C38/10 , C22C38/06 , C22C38/00 , C22C38/02 , C22C38/04 , C21D6/00 , B22F3/24
CPC分类号： H01F41/0293 , B22F3/1017 , B22F3/26 , B22F2003/248 , B22F2301/35 , B22F2998/10 , C21D6/004 , C21D6/005 , C21D6/007 , C21D6/008 , C22C28/00 , C22C33/02 , C22C38/002 , C22C38/005 , C22C38/007 , C22C38/008 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/105 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/20 , C22C38/60 , C22C2202/02 , H01F1/0311 , H01F1/0536 , H01F1/0577 , H01F1/058 , H01F41/005 , H01F41/0266
摘要： A rare earth sintered magnet is an anisotropic sintered body comprising Nd2Fe14 B crystal phase as primary phase and having the composition R1aTbMcSidBe wherein R1 is a rare earth element inclusive of Sc and Y, T is Fe and/or Co, M is Al, Cu, Zn, In, P, S, Ti, V, Cr, Mn, Ni, Ga, Ge, Zr, Nb, Mo, Pd, Ag, Cd, Sn, Sb, Hf, Ta, or W, “a” to “e” are 12≤a≤17, 0≤c≤10, 0.3≤d≤7, 5≤e≤10, and the balance of b, wherein Dy and/or Tb is diffused into the sintered body from its surface.
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公开(公告)号：US09734947B2
公开(公告)日：2017-08-15
申请号：US14055064
申请日：2013-10-16
发明人： Hajime Nakamura
CPC分类号： H01F41/0266 , C22C38/005 , H01F1/01 , H01F1/0572 , H01F1/0573 , H01F1/0577 , H01F41/0273
摘要： A strip cast alloy containing Nd in excess of the stoichiometry of Nd2Fe14B is subjected to HDDR treatment and diffusion treatment, yielding microcrystalline alloy powder in which major phase crystal grains with a size of 0.1-1 μm are surrounded by Nd-rich grain boundary phase with a width of 2-10 nm. The powder is finely pulverized, compacted, and sintered, yielding a sintered magnet having a high coercivity.
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公开(公告)号：US20170140856A1
公开(公告)日：2017-05-18
申请号：US15350327
申请日：2016-11-14
IPC分类号： H01F1/057 , C22C38/16 , C22C38/14 , B22F3/24 , C22C38/06 , C22C38/02 , C22C38/00 , B22F3/16 , H01F41/02 , C22C38/10
摘要： An R—(Fe,Co)—B base sintered magnet consisting essentially of 12-17 at % of R containing Nd and Pr, 0.1-3 at % of M1 (typically Si), 0.05-0.5 at % of M2 (typically Ti), B, and the balance of Fe, and containing R2(Fe,Co)14B as a main phase has a coercivity of at least 10 kOe. The magnet contains a M2 boride phase at a grain boundary triple junction, and has a core/shell structure that the main phase is covered with a grain boundary phase. The grain boundary phase is composed of an amorphous and/or nanocrystalline R′—(Fe,Co)-M1′ phase consisting essentially of 25-35 at % of R′ containing Pr, 2-8 at % of M1′ (typically Si), up to 8 at % of Co, and the balance of Fe. A coverage of the main phase with the R′—(Fe,Co)-M1′ phase is at least 50%, and the bi-granular grain boundary phase has a width of at least 50 nm.
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公开(公告)号：US20130271248A1
公开(公告)日：2013-10-17
申请号：US13860587
申请日：2013-04-11
发明人： Hiroaki Nagata , Yuuji Gouki , Kazuaki Sakaki , Tadao Nomura , Koichi Hirota , Hajime Nakamura
CPC分类号： H01F41/0293 , B22F3/1017 , B22F3/26 , B22F2003/248 , B22F2301/35 , B22F2998/10 , C21D6/004 , C21D6/005 , C21D6/007 , C21D6/008 , C22C28/00 , C22C33/02 , C22C38/002 , C22C38/005 , C22C38/007 , C22C38/008 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/105 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/20 , C22C38/60 , C22C2202/02 , H01F1/0311 , H01F1/0536 , H01F1/0577 , H01F1/058 , H01F41/005 , H01F41/0266
摘要： A rare earth sintered magnet as an anisotropic sintered body comprising Nd2Fe14B crystal phase as primary phase and having the composition R1aTbMcSidBe wherein R1 is a rare earth element inclusive of Sc and Y, T is Fe and/or Co, H is Al, Cu, Zn, In, P, S, Ti, V, Cr, Mn, Ni, Ga, Ge, Zr, Nb, Mo, Pd, Ag, Cd, Sn, Sb, Hf, Ta, or W, “a” to “e” are 12≦a≦17, 0≦c≦10, 0.3≦d≦7, 5≦e≦10, and the balance of b, wherein Dy and/or Tb is diffused into the sintered body from its surface.
摘要翻译： 作为各向异性烧结体的稀土烧结磁体，以Nd2Fe14B晶相为主相，组成为R1aTbMcSidBe，其中R1为包含Sc和Y的稀土元素，T为Fe和/或Co，H为Al，Cu，Zn ，In，P，S，Ti，V，Cr，Mn，Ni，Ga，Ge，Zr，Nb，Mo，Pd，Ag，Cd，Sn，Sb，Hf，Ta或W，“a” “为12 @ a @ 17，0 @ c @ 10，0.3 @ d @ 7，5 @ e @ 10，余量为b，其中Dy和/或Tb从表面扩散到烧结体中。
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公开(公告)号：US11798716B2
公开(公告)日：2023-10-24
申请号：US16592240
申请日：2019-10-03
发明人： Tetsuya Ohashi , Hiroki Iida , Koichi Hirota , Hajime Nakamura , Mikio Yoshida , Kazuya Fukui , Michihiro Oida
CPC分类号： H01F1/0536 , H01F1/0572 , H01F1/0577
摘要： Provided is a rare earth sintered magnet in which a multi-layer main phase particle having multiple layers including a layer 1 having R2 concentration, represented by at %, higher than that of a center of the particle, a layer 2 which is formed on the outside of the layer 1 and has R2 concentration lower than that of the layer 1, and a layer 3 which is formed on the outside of the layer 2 and has R2 concentration higher than that of the layer 2 is present at least in a portion in the vicinity of a surface of the main phase particle within at least 500 μm from a surface of the sintered magnet body.
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公开(公告)号：US10573438B2
公开(公告)日：2020-02-25
申请号：US15350327
申请日：2016-11-14
IPC分类号： H01F1/057 , B22F3/24 , H01F41/02 , B22F3/16 , C22C38/00 , C22C38/02 , C22C38/06 , C22C38/10 , C22C38/14 , C22C38/16
摘要： An R—(Fe,Co)—B base sintered magnet consisting essentially of 12-17 at % of R containing Nd and Pr, 0.1-3 at % of M1 (typically Si), 0.05-0.5 at % of M2 (typically Ti), B, and the balance of Fe, and containing R2(Fe,Co)14B as a main phase has a coercivity of at least 10 kOe. The magnet contains a M2 boride phase at a grain boundary triple junction, and has a core/shell structure that the main phase is covered with a grain boundary phase. The grain boundary phase is composed of an amorphous and/or nanocrystalline R′—(Fe,Co)—M1′ phase consisting essentially of 25-35 at % of R′ containing Pr, 2-8 at % of M1′ (typically Si), up to 8 at % of Co, and the balance of Fe. A coverage of the main phase with the R′—(Fe,Co)—M1′ phase is at least 50%, and the bi-granular grain boundary phase has a width of at least 50 nm.
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公开(公告)号：US10410775B2
公开(公告)日：2019-09-10
申请号：US15087241
申请日：2016-03-31
摘要： The invention provides an R—Fe—B sintered magnet consisting essentially of 12-17 at % of Nd, Pr and R, 0.1-3 at % of M1, 0.05-0.5 at % of M2, 4.8+2*m to 5.9+2*m at % of B, and the balance of Fe, containing R2(Fe,(Co))14B intermetallic compound as a main phase, and having a core/shell structure that the main phase is covered with grain boundary phases. The sintered magnet exhibits a coercivity of at least 10 kOe despite a low or nil content of Dy, Tb and Ho.
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公开(公告)号：US20180090249A1
公开(公告)日：2018-03-29
申请号：US15710341
申请日：2017-09-20
发明人： Tetsuya Ohashi , Tetsuya Kume , Koichi Hirota , Hajime Nakamura
CPC分类号： H01F1/0577 , B22F3/16 , B22F3/24 , B22F2003/248 , C22C38/005 , H01F41/0293
摘要： An R—Fe—B base sintered magnet is prepared through the steps of providing an alloy fine powder having a predetermined composition, compression shaping the alloy fine powder in an applied magnetic field into a compact, sintering the compact at a temperature of 900-1,250° C. into a sintered body, cooling the sintered body to 400° C. or below, high-temperature heat treatment including placing a metal, compound or intermetallic compound containing HR which is Dy, Tb and/or Ho, on the surface of the sintered body, heating at a temperature from more than 950° C. to 1,100° C., for causing grain boundary diffusion of HR into the sintered body, and cooling to 400° C. or below, and low-temperature heat treatment including heating at a temperature of 400-600° C. and cooling to 300° C. or below. The sintered magnet produces a high coercivity despite a low content of Dy, Tb and Ho.
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公开(公告)号：US09742248B2
公开(公告)日：2017-08-22
申请号：US14279938
申请日：2014-05-16
发明人： Yuhito Doi , Takehisa Minowa , Hajime Nakamura , Koichi Hirota
CPC分类号： H02K15/03 , H01F7/0221 , H02K1/2766 , Y10T29/49009 , Y10T29/49012
摘要： A method for assembling a rotor used in connection with an interior permanent magnet (IPM) rotary machine, the rotor having an axis of rotation and comprising a rotor yoke having bores and a plurality of permanent magnet segments disposed in the bores of the rotor yoke, each permanent magnet segment consisting of a plurality of magnet pieces. The method comprises the steps of: inserting the plurality of magnet pieces in each bore of the rotor yoke, with each of the magnet pieces for each of the magnet segments being kept loose from each other, for axially stacking the magnet pieces in the bore, and fixedly securing the stacked magnet pieces in the bore of the rotor yoke.
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