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公开(公告)号：US06527822B2
公开(公告)日：2003-03-04
申请号：US09942844
申请日：2001-08-31
IPC分类号： C22C2914
CPC分类号： B82Y25/00 , B22F9/023 , H01F1/0571 , H01F1/0573 , H01F1/0577 , H01F1/0579
摘要： Disclosed is a novel thin ribbon of a rare earth/iron/boron-based magnet alloy prepared by quenching of an alloy melt by the method of strip casting, from which a sintered permanent magnet is obtained by the powder metallurgical method. The sintered permanent magnet can be imparted with greatly improved magnetic properties or, in particular, residual magnetic flux density when the thin alloy ribbon as the base material thereof has a metallographic phase structure containing “four-phase regions” consisting of (a) an &agr;-iron phase, (b) a R-rich phase, in which R is a rare earth element selected from praseodymium, neodymium, terbium and dysprosium, (c) a RxT4B4 phase, in which T is iron or a combination of iron and a transition metal element other than iron and rare earth elements and x is a positive number varying with the rare earth element, and (d) a R2T14B phase, in which R and T each have the same meaning as defined above, each phase being dispersed with a grain diameter in a limited range, in a volume fraction of from 1 to 10%.
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公开(公告)号：US06419723B2
公开(公告)日：2002-07-16
申请号：US09943273
申请日：2001-08-31
IPC分类号： C22C2914
CPC分类号： H01F1/0577 , H01F1/0571
摘要： Disclosed is a thin alloy ribbon prepared by the strip casting method as an intermediate for the preparation of a sintered rare earth-based permanent magnet or, in particular, a neodymium/iron/boron-type permanent magnet. The thin alloy ribbon is characterized by a specific volume fraction of the four-phase coexisting region consisting of the &agr;-iron phase, R-rich phase, RXT4B4 phase and R2T14B phase each having an average grain diameter in a specified range and a specific volume fraction of the chill crystalline phase. When these requirements are satisfied, the sintered rare earth-based permanent magnet prepared from the thin alloy ribbons can be imparted with improved magnetic properties and high sintering density even without increasing the sintering temperature.
摘要翻译： 公开了一种通过带状铸塑法制备的薄合金带，作为制备稀土类烧结永磁体，特别是钕/铁/硼型永磁体的中间体。 该薄合金带的特征在于由α-铁相，富R相，RXT4B4相和R2T14B相组成的四相共存区的比体积分数，每相的平均粒径在特定范围内，比容积 冷冻结晶相的分数。 当满足这些要求时，即使不增加烧结温度，也可以将由薄合金带制备的烧结稀土类永久磁铁赋予改善的磁性能和高烧结密度。
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公开(公告)号：US06322637B1
公开(公告)日：2001-11-27
申请号：US09588536
申请日：2000-06-07
IPC分类号： H01F1057
CPC分类号： H01F1/0577 , H01F1/0571
摘要： Disclosed is a thin alloy ribbon prepared by the strip casting method as an intermediate for the preparation of a sintered rare earth-based permanent magnet or in particular, a neodymium/iron/boron-type permanent magnet. The thin alloy ribbon is characterized by a specific volume fraction of the four-phase coexisting region consisting of the &agr;-iron phase, R-rich phase, RxT4B4 phase and R2T14B phase each having an average grain diameter in a specified range and a specific volume fraction of the chill crystalline phase. When these requirements are satisfied, the sintered rare earth-based permanent magnet prepared from the thin alloy ribbons can be imparted with improved magnetic properties and high sintering density even without increasing the sintering temperature.
摘要翻译： 公开了一种薄带合金带，其通过带状铸造法制备为制备稀土类烧结永磁体，特别是钕/铁/硼型永磁体的中间体。 该薄合金带的特征在于由α-铁相，富R相，RxT4B4相和R2T14B相组成的四相共存区域的比体积分数，其平均晶粒直径在特定范围内，比容积 冷冻结晶相的分数。 当满足这些要求时，即使不增加烧结温度，也可以将由薄合金带制备的烧结稀土类永久磁铁赋予改善的磁性能和高烧结密度。
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公开(公告)号：US06319335B1
公开(公告)日：2001-11-20
申请号：US09502777
申请日：2000-02-11
IPC分类号： H01F1057
CPC分类号： B82Y25/00 , B22F9/023 , H01F1/0571 , H01F1/0573 , H01F1/0577 , H01F1/0579
摘要： Disclosed is a novel thin ribbon of a rare earth/iron/boron-based magnet alloy prepared by quenching of an alloy melt by the method of strip casting, from which a sintered permanent magnet is obtained by the powder metallurgical method. The sintered permanent magnet can be imparted with greatly improved magnetic properties or, in particular, residual magnetic flux density when the thin alloy ribbon as the base material thereof has a metallographic phase structure containing “four-phase regions” consisting of (a) an &agr;-iron phase, (b) a R-rich phase, in which R is a rare earth element selected from praseodymium, neodymium, terbium and dysprosium, (c) a RxT4B4 phase, in which T is iron or a combination of iron and a transition metal element other than iron and rare earth elements and x is a positive number varying with the rare earth element, and (d) a R2T14B phase, in which R and T each have the same meaning as defined above, each phase being dispersed with a grain diameter in a limited range, in a volume fraction of from 1 to 10%.
摘要翻译： 公开了一种稀土/铁/硼基磁体合金的新颖薄带，其通过带状铸造方法淬火合金熔体而制备，通过粉末冶金法获得烧结永久磁铁。 当作为其基材的薄合金带具有包含由（a）α（a））组成的“四相区域”的金相相结构时，可以赋予烧结永久磁铁大大提高的磁性能，特别是剩余磁通密度 - 相，（b）富R相，其中R是选自镨，钕，铽和镝的稀土元素，（c）RxT4B4相，其中T是铁或铁和 除铁和稀土元素以外的过渡金属元素，x是稀土元素变化的正数，（d）R2T14B相，其中R和T各自具有与上述相同的含义，每相分散有 粒径在有限范围内，体积分数为1〜10％。
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公开(公告)号：US08012269B2
公开(公告)日：2011-09-06
申请号：US11315099
申请日：2005-12-23
申请人： Kenji Yamamoto , Koichi Hirota , Takehisa Minowa
发明人： Kenji Yamamoto , Koichi Hirota , Takehisa Minowa
IPC分类号： H01F1/057
CPC分类号： H01F1/0577 , C22C38/002 , C22C38/005 , C22C38/06 , C22C38/10 , C22C38/14 , C22C38/16 , H01F1/058
摘要： A rare earth permanent magnet material is based on an R—Fe—Co—B—Al—Cu system wherein R is at least one element selected from Nd, Pr, Dy, Tb, and Ho, 15 to 33% by weight of Nd being contained. At least two compounds selected from M-B, M-B—Cu and M-C compounds (wherein M is Ti, Zr or Hf) and an R oxide have precipitated within the alloy structure as grains having an average grain size of up to 5 μm which are uniformly distributed in the alloy structure at intervals of up to 50 μm.
摘要翻译： 稀土永磁材料是基于R-Fe-Co-B-Al-Cu系，其中R是选自Nd，Pr，Dy，Tb和Ho中的至少一种元素，15至33重量％的Nd 被包含 选择MB，MB-Cu和MC化合物（其中M为Ti，Zr或Hf）和R氧化物的至少两种化合物在合金结构内析出，其平均粒径高达5μm的晶粒均匀分布 在合金结构中以高达50μm的间隔。
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公开(公告)号：US08420010B2
公开(公告)日：2013-04-16
申请号：US11916498
申请日：2007-03-28
申请人： Hajime Nakamura , Takehisa Minowa , Koichi Hirota
发明人： Hajime Nakamura , Takehisa Minowa , Koichi Hirota
IPC分类号： B22F7/00
CPC分类号： C23C10/30 , B22F3/24 , B22F2003/241 , B22F2003/242 , B22F2003/247 , B22F2003/248 , C21D6/00 , C22C38/005 , C22C2202/02 , C23C10/28 , C23C10/52 , C23C24/08 , H01F1/0577 , H01F41/0293
摘要： A method for preparing a rare earth permanent magnet material is characterized by comprising the steps of disposing a powder mixture on a surface of a sintered magnet body of R1—Fe—B composition wherein R1 is at least one element selected from rare earth elements inclusive of Sc and Y, the powder mixture comprising a powder containing at least 0.5% by weight of M which is at least one element selected from Al, Cu, and Zn and having an average particle size equal to or less than 300 μm and a powder containing at least 30% by weight of a fluoride of R2 which is at least one element selected from rare earth elements inclusive of Sc and Y and having an average particle size equal to or less than 100 μm, and heat treating the magnet body having the powder disposed on its surface at a temperature equal to or below the sintering temperature of the magnet body in vacuum or in an inert gas, for causing at least one of M and R2 in the powder mixture to be absorbed in the magnet body. The invention provides an R—Fe—B sintered magnet with high performance and a minimized amount of Tb or Dy used.
摘要翻译： 一种制备稀土永磁材料的方法的特征在于包括以下步骤：在R1-Fe-B组合物的烧结磁体的表面上设置粉末混合物，其中R 1是选自稀土元素中的至少一种元素，包括 Sc和Y，所述粉末混合物包含含有至少0.5重量％M的至少一种选自Al，Cu和Zn的元素并且具有等于或小于300μm的平均粒度的粉末和包含 至少30重量％的R 2的氟化物，其为选自包括Sc和Y的稀土元素中的至少一种元素，并且具有等于或小于100μm的平均粒度，并且对具有粉末的磁体进行热处理 在真空中或在惰性气体中的等于或低于磁体的烧结温度的温度下，在粉末混合物中使M和R2中的至少一个吸收在磁体中。 本发明提供一种具有高性能和最小量的Tb或Dy的R-Fe-B烧结磁体。
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公开(公告)号：US07955443B2
公开(公告)日：2011-06-07
申请号：US11783639
申请日：2007-04-11
申请人： Hajime Nakamura , Takehisa Minowa , Koichi Hirota
发明人： Hajime Nakamura , Takehisa Minowa , Koichi Hirota
IPC分类号： H01F1/057
CPC分类号： H01F41/0293 , H01F1/0577
摘要： A permanent magnet material is prepared by covering an anisotropic sintered magnet body of formula: R1x(Fe1-yCoy)100-x-z-aBzMa wherein R1 is a rare earth element, M is Al, Cu or the like, with a powder comprising an oxide of R2, a fluoride of R3 or an oxyfluoride of R4 wherein R2, R3, and R4 are rare earth elements, and having an average particle size up to 100 μm, heat treating the powder-covered magnet body in a hydrogen gas-containing atmosphere for inducing disproportionation reaction on R12Fe14B compound, and continuing heat treatment at a reduced hydrogen gas partial pressure for inducing recombination reaction to said compound, thereby finely dividing said compound phase to a crystal grain size up to 1 μm, and for effecting absorption treatment, thereby causing R2, R3 or R4 to be absorbed in the magnet body.
摘要翻译： 通过覆盖式为：R1x（Fe1-yCoy）100-xz-aBzMa的各向异性烧结磁体，其中R1是稀土元素，M是Al，Cu等，并且包含氧化物 的R2，R3的氟化物或R4的氟氧化物，其中R2，R3和R4是稀土元素，平均粒径高达100μm，在含氢气体的气氛中对粉末包覆的磁体进行热处理 用于在R12Fe14B化合物上诱导歧化反应，并且在降低的氢气分压下继续热处理以诱导与所述化合物的复合反应，从而将所述化合物相细分至1μm以上的晶粒尺寸，从而进行吸收处理 导致R2，R3或R4被吸收在磁体中。
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公开(公告)号：US07531933B2
公开(公告)日：2009-05-12
申请号：US11846690
申请日：2007-08-29
申请人： Koji Miyata , Hajime Nakamura , Koichi Hirota , Takehisa Minowa
发明人： Koji Miyata , Hajime Nakamura , Koichi Hirota , Takehisa Minowa
IPC分类号： H02K1/27
CPC分类号： H02K1/02 , H01F1/0577 , H01F41/0293 , H02K1/278 , H02K15/03 , H02K29/03
摘要： In a rotating machine comprising a rotor including a rotor core and a plurality of permanent magnet segments, and a stator including a stator core and windings, the permanent magnet segment is obtained by disposing a powder comprising an R2 oxide, R3 fluoride or R4 oxyfluoride on a sintered magnet body of R1—Fe—B composition, wherein R1 to R4 are rare earth elements, and heat treating the powder-covered magnet body. The permanent magnet segment of a cross-sectional shape which is tapered from the center toward opposed ends has a higher coercive force at the ends than at the center.
摘要翻译： 在包括转子铁心和多个永久磁铁段的转子和包括定子铁心和绕组的定子的旋转机械中，通过将包含R2氧化物，R3氟化物或R4氟氧化物的粉末设置在 R1-Fe-B组合物的烧结磁体，其中R1至R4为稀土元素，并对粉末覆盖的磁体进行热处理。 从中心向相对端逐渐变细的横截面形状的永磁体段在端部具有比中心更高的矫顽力。
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公开(公告)号：US07488393B2
公开(公告)日：2009-02-10
申请号：US11340498
申请日：2006-01-27
CPC分类号： H01F1/0577 , B22F2009/041 , B22F2009/044 , B22F2998/00 , B22F2998/10 , C22C33/0278 , C22C38/005 , C22C2202/02 , H01F1/058 , H01F41/0266 , H01F41/0293 , B22F9/04 , B22F2201/02 , B22F2202/05 , B22F9/023 , B22F3/02 , B22F3/10
摘要： A rare earth permanent magnet is in the form of a sintered magnet body having a composition R1aR2bTcAdFeOfMg wherein F and R2 are distributed such that their concentration increases on the average from the center toward the surface of the magnet body, the concentration of R2/(R1+R2) contained in grain boundaries surrounding primary phase grains of (R1,R2)2T14A tetragonal system within the sintered magnet body is on the average higher than the concentration of R2/(R1+R2) contained in the primary phase grains, and the oxyfluoride of (R1,R2) is present at grain boundaries in a grain boundary region that extends from the magnet body surface to a depth of at least 20 μm. The invention provides R—Fe—B sintered magnets which exhibit high magnet performance despite minimal amounts of Tb and Dy used.
摘要翻译： 稀土永磁体为具有组成R1aR2bTcAdFeOfMg的烧结磁体的形式，其中F和R2分布成使得它们的浓度从中心向磁体的平均值增加，R2 /（R1 包含在烧结磁体内的（R1，R2）2T14A四方晶系的主相晶粒周围的晶界中的+ R2）平均高于主晶粒中所含的R2 /（R1 + R2）的浓度， （R1，R2）的氟氧化物存在于从磁体表面延伸至至少20μm的深度的晶界区域的晶界处。 本发明提供了尽管使用最少量的Tb和Dy，其表现出高磁性能的R-Fe-B烧结磁体。
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公开(公告)号：US20070125452A1
公开(公告)日：2007-06-07
申请号：US11606088
申请日：2006-11-30
申请人： Koichi Hirota , Takehisa Minowa
发明人： Koichi Hirota , Takehisa Minowa
CPC分类号： H01F1/0577 , H01F1/0573 , H01F1/058 , H01F41/0273 , H01F41/0293
摘要： An R-T-B—C rare earth sintered magnet (R═Ce, Pr, Nd, Tb, or Dy; T=Fe) is obtained by mixing an R-T-B—C magnet matrix alloy with an R fluoride and an R-rich R-T-B—C sintering aid alloy, followed by pulverization, compaction and sintering. The sintered structure consists of an R2T14B type crystal primary phase and a grain boundary phase. The grain boundary phase consists essentially of 40-98 vol % of R—O1-x—F1+2x and/or R—Fy, 1-50 vol % of R—O, R—O—C or R—C compound phase, 0.05-10 vol % of R-T phase, 0.05-20 vol % of B-rich phase or M-B2 phase (M=Ti, V, Cr, Zr, Nb, Mo, Hf, Ta or W), and the balance of an R-rich phase.
摘要翻译： 将RTBC稀土烧结磁体（R-Ce，Pr，Nd，Tb或Dy; T = Fe）通过将RTBC磁体基质合金与R氟化物和富R的RTBC烧结助剂合金混合，然后粉碎 ，压实和烧结。 该烧结结构由R 2 S 14 N 14 B型晶体初相和晶界相组成。 晶界相基本上由40-98％（重量）的RO 1-x 1 -F 1 + 2 +和/或RF Y 1， -50体积％的RO，ROC或RC化合物相，0.05-10体积％的RT相，0.05-20体积％的富B相或MB 2相（M = Ti，V， Cr，Zr，Nb，Mo，Hf，Ta或W），余量为富R相。
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