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    Lamellar rare earth-iron-boron-based magnet alloy particles, process for producing the same and bonded magnet produced therefrom
    1.
    发明授权
    Lamellar rare earth-iron-boron-based magnet alloy particles, process for producing the same and bonded magnet produced therefrom 失效
    层状稀土 - 铁 - 硼基磁体合金颗粒，其制造方法和由其制造的粘结磁体

    公开(公告)号：US06494968B1

    公开(公告)日：2002-12-17

    申请号：US09241423

    申请日：1999-02-02

    申请人： Masaaki Hamano ,  Minoru Yamasaki ,  Hirotaka Mizuguchi

    发明人： Masaaki Hamano ,  Minoru Yamasaki ,  Hirotaka Mizuguchi

    IPC分类号： H01F1057

    CPC分类号： B82Y25/00 ,  B22F9/082 ,  B22F2009/086 ,  C22C1/0441 ,  H01F1/0574 ,  H01F1/0578 ,  H01F1/0579

    摘要： Lamellar rare earth-iron-boron-based magnet alloy particles for a bonded magnet, having an intrinsic coercive force (iHc) of not less than 3.5 kOe, a residual magnetic flux density (Br) of not less than 9.5 kG, and a maximum energy product ((BH)max) of not less than 13 MGOe. These particles have an average major axial diameter of 60 to 500 &mgr;m, an average minor axial diameter of 50 to 460 &mgr;m, an average axis ratio (major axial diameter/minor axial diameter) of 1.1 to 10 and an average aspect ratio (major axial diameter/thickness) of 3 to 100. The magnet alloy particles have a residual magnetic flux density (Br) as high as not less than 10 kG, an intrinsic coercive force (iHc) as large as not less than 3.5 kOe and a maximum energy product ((BH)max) as large as not less than 13 MGOe, are used as a material for high-performance bonded magnets.

    摘要翻译： 具有不小于3.5kOe的本征矫顽力（iHc），不小于9.5kG的剩余磁通密度（Br）和最大值的最大值的用于粘结磁体的层状稀土 - 铁 - 硼基磁体合金颗粒 能量积（（BH）max）不小于13MGOe。 这些颗粒的平均主轴向直径为60至500μm，平均次轴径为50至460μm，平均轴比（主轴向直径/次轴径）为1.1至10，平均纵横比（主轴向 直径/厚度）为3〜100。磁体合金粒子的残留磁通密度（Br）高达10kG以上，固有矫顽力（iHc）大至不小于3.5kOe，最大能量 使用大于13MGOe的产品（（BH）max）用作高性能粘结磁体的材料。

    Rare earth bonded magnet and rare earth-iron-boron type magnet alloy
    2.
    发明授权
    Rare earth bonded magnet and rare earth-iron-boron type magnet alloy 失效
    稀土粘结磁铁和稀土 - 铁硼型磁铁合金

    公开(公告)号：US5872501A

    公开(公告)日：1999-02-16

    申请号：US906810

    申请日：1997-08-06

    申请人： Masaaki Hamano ,  Minoru Yamasaki ,  Akihisa Indue ,  Akira Takeuchi ,  Yuji Omote

    发明人： Masaaki Hamano ,  Minoru Yamasaki ,  Akihisa Indue ,  Akira Takeuchi ,  Yuji Omote

    IPC分类号： C22C1/04 ,  H01F1/057 ,  H01H67/02

    CPC分类号： H01F1/0578 ,  C22C1/0441 ,  H01F41/0293 ,  Y10S977/838

    摘要： A rare earth bonded magnet obtained by mixing two types of magnetic powders (A) and (B) in the present invention has a high residual magnetic flux density (Br), a large intrinsic coercive force (iHc) and a large maximum energy product ((BH)max) in spite of a low rare earth element content, and shows an excellent rust preventability. A rare earth-iron-boron type magnet alloy of the present invention has a residual magnetic flux density (Br) as high as not less than 10 kG, an intrinsic coercive force (iHc) as large as not less than 3.5 kOe and a large maximum energy product ((BH)max) and which has an excellent rust preventability.

    摘要翻译： 通过在本发明中混合两种类型的磁粉（A）和（B）得到的稀土粘结磁体具有高残留磁通密度（Br），大的固有矫顽力（iHc）和大的最大能量积（ （BH）max），尽管稀土元素含量低，但具有优异的防锈性。 本发明的稀土 - 铁 - 硼型磁铁合金的残留磁通密度（Br）高达10kG以上，3.5KOe以上的固有矫顽力（iHc）大， 最大能量积（（BH）max），具有优良的防锈性能。

    Cobalt-coated acicular magnetic iron oxide particles
    4.
    发明授权
    Cobalt-coated acicular magnetic iron oxide particles 失效
    钴包覆针状磁性氧化铁颗粒

    公开(公告)号：US5968405A

    公开(公告)日：1999-10-19

    申请号：US880676

    申请日：1997-06-23

    申请人： Minoru Yamasaki ,  Katsunori Fujimoto ,  Toshitada Shigemura ,  Katsumi Yamashita

    发明人： Minoru Yamasaki ,  Katsunori Fujimoto ,  Toshitada Shigemura ,  Katsumi Yamashita

    IPC分类号： C01G49/00 ,  G11B5/712 ,  H01F1/11

    CPC分类号： H01F1/112 ,  G11B5/712 ,  Y10T428/2991

    摘要： Cobalt-coated acicular magnetic iron oxide particles of the present invention have an average major axial diameter of 0.15 to 0.50 .mu.m, and comprise:as seed crystal particles, acicular magnetic iron oxide particles containing 0.05 to 1.0 wt % of phosphorus, calculated as P, based on the weight of the cobalt-coated acicular magnetic iron oxide particles;as inner layers, spinel ferrite layers containing cobalt formed on the surfaces of said seed crystal particles; andas outer layers, coating layers comprising a hydroxide of magnesium formed on said spinel ferrite layers.Such cobalt-coated acicular magnetic iron oxide particles show a smaller change of coercive force with temperature, have a small switching field distribution and, hence, are suitable as magnetic particles for magnetic recording media.

    摘要翻译： 本发明的钴包覆的针状磁性氧化铁颗粒的平均主轴径为0.15〜0.50μm，包括：作为晶种颗粒，含有0.05〜1.0重量％磷的针状磁性氧化铁颗粒，计算为P ，基于钴涂覆的针状磁性氧化铁颗粒的重量; 作为内层，在所述晶种颗粒的表面上形成含有钴的尖晶石铁氧体层; 并且作为外层，包含在所述尖晶石铁素体层上形成的包含镁的氢氧化物的涂层。 这种钴涂覆的针状磁性氧化铁颗粒随着温度显示出矫顽力变化较小，开关场分布小，因此适用于磁记录介质的磁性颗粒。