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    • 31. 发明申请
    • METHOD FOR PREPARING RARE EARTH PERMANENT MAGNET MATERIAL
    • 制备稀土永磁材料的方法
    • US20090098006A1
    • 2009-04-16
    • US11916506
    • 2007-03-28
    • Hajime NakamuraTakehisa MinowaKoichi Hirota
    • Hajime NakamuraTakehisa MinowaKoichi Hirota
    • B22F7/04
    • B22F7/02C21D6/00C22C38/005H01F1/0577H01F41/0293
    • A method for preparing a rare earth permanent magnet material comprises the steps of disposing a powder on a surface of a sintered magnet body of R1aTbAcMd composition wherein R1 is a rare earth element inclusive of Sc and Y, T is Fe and/or Co, A is boron (B) and/or carbon (C), M is Al, Cu, Zn, In, Si, P, S, Ti, V, Cr, Mn, Ni, Ga, Ge, Zr, Nb, Mo, Pd, Ag, Cd, Sn, Sb, Hf, Ta, or W, said powder comprising an oxide of R2, a fluoride of R3 or an oxyfluoride of R4 wherein R2, R3, and R4 are rare earth elements inclusive of Sc and Y and having an average particle size equal to or less than 100 μm, heat treating the magnet body and the powder at a temperature equal to or below the sintering temperature of the magnet body for absorption treatment for causing R2, R3, and R4 in the powder to be absorbed in the magnet body, and repeating the absorption treatment at least two times. According to the invention, a rare earth permanent magnet material can be prepared as an R—Fe—B sintered magnet with high performance and a minimized amount of Tb or Dy used.
    • 一种制备稀土永磁材料的方法包括以下步骤:在R1aTbAcMd组合物的烧结磁体的表面上设置粉末,其中R1是包括Sc和Y的稀土元素,T是Fe和/或Co,A 是硼(B)和/或碳(C),M是Al,Cu,Zn,In,Si,P,S,Ti,V,Cr,Mn,Ni,Ga,Ge,Zr,Nb,Mo, ,Ag,Cd,Sn,Sb,Hf,Ta或W,所述粉末包含R2的氧化物,R3的氟化物或R4的氟氧化物,其中R2,R3和R4是包括Sc和Y的稀土元素, 具有等于​​或小于100μm的平均粒度,在等于或低于磁体的烧结温度的温度下对磁体和粉末进行热处理,以便使粉末中的R2,R3和R4进行吸收处理 被吸收在磁体中,并且重复吸收处理至少两次。 根据本发明,稀土永磁材料可以制备成具有高性能和最小量的Tb或Dy的R-Fe-B烧结磁体。
    • 33. 发明申请
    • Method for preparing rare earth permanent magnet material
    • 稀土永磁材料的制备方法
    • US20070240788A1
    • 2007-10-18
    • US11783639
    • 2007-04-11
    • Hajime NakamuraTakehisa MinowaKoichi Hirota
    • Hajime NakamuraTakehisa MinowaKoichi Hirota
    • H01F1/057
    • H01F41/0293H01F1/0577
    • 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.
    • 通过覆盖以下结构的各向异性烧结磁体制备永久磁铁材料:R 1→X 2(Fe 1-y Co) 其中R 1为稀土元素,M为M,其中R 1为稀土元素,M 是Al,Cu等,其中包含R 2 2的氧化物,R 3的氟化物或R 4的氟氧化物的粉末, 其中R 2,R 3和R 4是稀土元素,并且具有高达100μm的平均粒度,热处理 在含氢气体气氛中的粉末覆盖的磁体,用于在R 1 2 Fe 14 B化合物上诱导歧化反应,并且继续热处理 在降低的氢气分压下引起与所述化合物的复合反应,由此将所述化合物相细分至1μm以下的晶粒尺寸,进行吸收处理,从而使R 2,R 或 3 R 4被吸收在磁体中。
    • 35. 发明申请
    • Functionally graded rare earth permanent magnet
    • 功能分级稀土永磁体
    • US20060213585A1
    • 2006-09-28
    • US11340521
    • 2006-01-27
    • Hajime NakamuraKoichi HirotaMasanobu ShimaoTakehisa Minowa
    • Hajime NakamuraKoichi HirotaMasanobu ShimaoTakehisa Minowa
    • H01F1/057H01F1/058
    • H01F1/0577H01F1/058H01F41/0266H01F41/0293
    • A functionally graded rare earth permanent magnet having a reduced eddy current loss in the form of a sintered magnet body having a composition RaEbTcAdFeOfMg is obtained by causing E and fluorine atoms to be absorbed in a R—Fe—B sintered magnet body from its surface. F is distributed such that its concentration increases on the average from the center toward the surface of the magnet body, the concentration of E/(R+E) contained in grain boundaries surrounding primary phase grains of (R,E)2T14A tetragonal system is on the average higher than the concentration of E/(R+E) contained in the primary phase grains, the oxyfluoride of (R,E) 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, particles of the oxyfluoride having an equivalent circle diameter of at least 1 μm are distributed in the grain boundary region at a population of at least 2,000 particles/mm2, the oxyfluoride is present in an area fraction of at least 1%. The magnet body includes a surface layer having a higher electric resistance than in the interior. In the permanent magnet, the generation of eddy current within a magnetic circuit is restrained.
    • 功能梯度稀土永磁体,其具有呈烧结磁体形式的具有减小的涡流损耗的组合物,其具有组成R a a B B C C 通过使E和氟原子被吸收在...中而获得。 R-Fe-B烧结磁体从其表面。 F的分布使得其浓度从磁体的中心向表面平均增加,包含在(R,E)2的主相晶粒周围的晶界中的E /(R + E)浓度 四方晶系平均高于主相晶粒中所含的E /(R + E)浓度,(R,E)的氟氧化物存在于 在从磁体表面延伸至至少20μm的深度的晶界区域中的晶界,具有至少1um的当量圆直径的氟氧化物颗粒至少分布在晶界区域 2,000颗粒/ mm 2,氟氧化物以至少1%的面积分数存在。 磁体包括具有比内部更高的电阻的表面层。 在永磁体中,抑制了磁路内的涡电流的产生。