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    Rare earth-iron-boron permanent magnet and method for the preparation thereof
    1.
    发明授权
    Rare earth-iron-boron permanent magnet and method for the preparation thereof 有权
    稀土铁硼永久磁铁及其制备方法

    公开(公告)号：US5930582A

    公开(公告)日：1999-07-27

    申请号：US217207

    申请日：1998-12-22

    申请人： Masaru Ito ,  Ken Ohashi ,  Yoshio Tawara ,  Tadao Nomura ,  Takehisa Minowa

    发明人： Masaru Ito ,  Ken Ohashi ,  Yoshio Tawara ,  Tadao Nomura ,  Takehisa Minowa

    IPC分类号： C22C33/02 ,  C22C38/00 ,  H01F1/053 ,  H01F1/057 ,  H01F1/08 ,  H01F41/02 ,  B22F3/12 ,  B22F1/00

    CPC分类号： B82Y25/00 ,  H01F1/0577 ,  H01F1/0579

    摘要： Disclosed is a method for the preparation of a novel composite rare earth-based magnetically anisotropic sintered permanent magnet in which: (a) a base alloy consisting of a host phase of R.sub.2 T.sub.14 B (R: a rare earth element; T: iron or a combination of iron and cobalt) having a particle diameter of 2 to 10 .mu.m and containing in each particle a phase rich in the content of T and having a particle diameter not exceeding 1 .mu.m is prepared by the strip casting method; (b) the base alloy is crushed; (c) the base alloy powder is blended in a specified proportion with a powder of an auxiliary alloy of R-T or R-T-B in a specified proportion; (d) the powder blend is subjected to further comminution; (e) the comminuted powder blend is subjected to compression-molding in a magnetic field into a powder compact; and (f) the powder compact is sintered by a heat treatment.

    摘要翻译： 公开了一种制备新型复合稀土类磁各向异性烧结永磁体的方法，其中：（a）由R2T14B的主相（R：稀土元素; T：铁或组合 的铁和钴），通过带状铸造法制备颗粒直径为2〜10μm，并且在每个颗粒中含有富含T含量的相，其粒径不超过1μm的相。 （b）将基础合金粉碎; （c）以规定比例将基础合金粉末以规定比例与R-T或R-T-B的辅助合金粉末混合; （d）粉末混合物进一步粉碎; （e）粉碎的粉末混合物在磁场中进行压缩成型成粉末压块; 和（f）粉末压坯通过热处理烧结。

    Rare earth-based permanent magnet material and method for the preparation thereof
    2.
    发明授权
    Rare earth-based permanent magnet material and method for the preparation thereof 有权
    稀土永磁材料及其制备方法

    公开(公告)号：US6078237A

    公开(公告)日：2000-06-20

    申请号：US218005

    申请日：1998-12-22

    申请人： Tadao Nomura ,  Ken Ohashi ,  Takehisa Minowa ,  Yoshio Tawara ,  Masaru Ito

    发明人： Tadao Nomura ,  Ken Ohashi ,  Takehisa Minowa ,  Yoshio Tawara ,  Masaru Ito

    IPC分类号： C22C38/00 ,  H01F1/053 ,  H01F1/057 ,  H01F7/02

    CPC分类号： B82Y25/00 ,  H01F1/057 ,  H01F1/0571 ,  H01F1/0576 ,  H01F1/0579

    摘要： Disclosed is a rare earth-based, magnetically anisotropic permanent magnet material consisting of a rare earth element, e.g., neodymium or praseodymium, iron optional in combination with cobalt and boron and having excellent magnetic properties by virtue of the magnetic coupling between the magnetically hard and soft phases. The magnet material has a structure consisting of crystalline particles of, e.g., Nd.sub.2 Fe.sub.14 B, having a particle diameter of 1 .mu.m or larger and fine crystals of iron of submicron size in a rod-shaped or platelet form precipitated within each crystalline particle of Nd.sub.2 Fe.sub.14 B. This magnet material can be prepared by several different methods including, for example, a solid phase reaction of an intermetallic compound of Nd.sub.2 Fe.sub.17 with boron to effect a double decomposition reaction producing Nd.sub.2 Fe.sub.14 B and iron.

    摘要翻译： 公开了一种稀土类磁性各向异性永磁材料，其由稀土元素（例如钕或镨）组成，铁与钴和硼组合可选，并且由于磁性硬和 软相。 磁体材料具有由例如粒径为1μm以上的Nd 2 Fe 14 B的结晶粒子构成的结构，在Nd 2 Fe 14 B的各结晶粒子内析出棒状或者血小板形状的亚微米尺寸的铁的微细结晶。 该磁体材料可以通过几种不同的方法制备，包括例如Nd 2 Fe 17的金属间化合物与硼的固相反应，以产生产生Nd 2 Fe 14 B和铁的双重分解反应。

    Method for the preparation of rare earth based anisotropic permanent magnet
    3.
    发明授权
    Method for the preparation of rare earth based anisotropic permanent magnet 失效
    稀土类各向异性永磁体的制备方法

    公开(公告)号：US5976271A

    公开(公告)日：1999-11-02

    申请号：US55822

    申请日：1998-04-06

    申请人： Tadao Nomura ,  Masaru Ito ,  Ken Ohashi

    发明人： Tadao Nomura ,  Masaru Ito ,  Ken Ohashi

    IPC分类号： H01F1/057 ,  C21D1/04

    CPC分类号： B82Y25/00 ,  H01F1/0571 ,  H01F1/0579 ,  Y10S977/838

    摘要： Provided by the invention is a method for the preparation of a magnetically anisotropic permanent magnet mainly consisting of crystallites of the Nd.sub.2 Fe.sub.14 B phase. The method comprises the steps of:(a) preparing an amorphous alloy of neodymium, iron and boron in molar fractions corresponding to the Nd.sub.2 Fe.sub.14 B phase or a nanocomposite of the Nd.sub.2 Fe.sub.14 B/Fe.sub.3 B or Nd.sub.2 Fe.sub.14 B/Fe system, for example, by the melt-spun method; and (b) subjecting the amorphous alloy of neodymium, iron and boron to a heat treatment in a magnetic field of at least 3 T (tesla) at a temperature in the range from 550 to 800.degree. C. for a length of time in the range from 1.times.10.sup.2 to 1.times.10.sup.4 seconds in an atmosphere of a non-reactive gas or vacuum.

    摘要翻译： 本发明提供了一种主要由Nd2Fe14B相微晶组成的磁各向异性永磁体的制备方法。 该方法包括以下步骤：（a）制备与Nd 2 Fe 14 B相对应的摩尔分数的钕，铁和硼的非晶合金，或者通过熔融纺丝制备Nd 2 Fe 14 B / Fe 3 B或Nd 2 Fe 14 B / Fe体系的纳米复合材料 方法; 和（b）使钕，铁和硼的非晶合金在至少3T（特斯拉）的磁场中在550-800℃的温度下进行热处理一段时间 在非反应性气体或真空气氛中，范围为1×102-1×104秒。

    METHOD OF PRODUCING SiC SINGLE CRYSTAL
    4.
    发明申请
    METHOD OF PRODUCING SiC SINGLE CRYSTAL 审中-公开
    生产SiC单晶的方法

    公开(公告)号：US20120132130A1

    公开(公告)日：2012-05-31

    申请号：US13300911

    申请日：2011-11-21

    申请人： Tadao Nomura ,  Norio Yamagata ,  Takehisa Minowa

    发明人： Tadao Nomura ,  Norio Yamagata ,  Takehisa Minowa

    IPC分类号： H01L21/30

    CPC分类号： C30B29/36 ,  C30B9/10 ,  C30B11/04

    摘要： A method of producing a SiC single crystal includes: disposing a SiC seed crystal at a bottom part inside a graphite crucible; causing a solution containing Si, C and R (R is at least one selected from the rare earth elements inclusive of Sc and Y) or X (X is at least one selected from the group consisting of Al, Ge, Sn, and transition metals exclusive of Sc and Y) to be present in the crucible; supercooling the solution so as to cause the SiC single crystal to grow on the seed crystal; and adding powdery or granular Si and/or SiC raw material to the solution from above the graphite crucible while keeping the growth of the SiC single crystal.

    摘要翻译： 制造SiC单晶的方法包括：在石墨坩埚内部的底部设置SiC晶种; 导致含有Si，C和R的溶液（R是选自包括Sc和Y的稀土元素中的至少一种）或X（X是选自Al，Ge，Sn和过渡金属中的至少一种 不包括Sc和Y）存在于坩埚中; 过冷却溶液，使SiC单晶在晶种上生长; 并且在保持SiC单晶生长的同时，从石墨坩埚上方向溶液中添加粉状或粒状的Si和/或SiC原料。

    R-Fe-B sintered magnet
    6.
    发明授权
    R-Fe-B sintered magnet 有权
    R-Fe-B烧结磁体

    公开(公告)号：US07090730B2

    公开(公告)日：2006-08-15

    申请号：US10706006

    申请日：2003-11-13

    申请人： Tadao Nomura ,  Takehisa Minowa

    发明人： Tadao Nomura ,  Takehisa Minowa

    IPC分类号： H01F1/057

    CPC分类号： H01F1/0577

    摘要： An R—Fe—B base sintered magnet having a composition of 12–17 at % of R (wherein R stands for at least two of yttrium and rare earth elements and essentially contains Nd and Pr), 0.1–3 at % of Si, 5–5.9 at % of B, 0–10 at % of Co, and the balance of Fe, containing a R2(Fe,(Co),Si)14B intermetallic compound primary phase and at least 1% by volume of an R—Fe(Co)—Si grain boundary phase, and being free of a B-rich phase exhibits a coercive force of at least 10 kOe despite a reduced content of heavy rare earth.

    摘要翻译： 一种R-Fe-B基烧结磁体，其组成为R的12-17原子％（其中R代表钇和稀土元素中的至少两种，并且基本上含有Nd和Pr），0.1-3原子％的Si， Co的5-5.9at％，Co的0-10at％，余量为含有R 2（Fe，（Co），Si）14的Fe。 B金属间化合物初生相和至少1体积％的R-Fe（Co）-Si晶界相，并且不含富B相，具有至少10kOe的矫顽力，尽管重量 稀土

    Method of producing SiC single crystal
    8.
    发明授权
    Method of producing SiC single crystal 有权

    公开(公告)号：US10167573B2

    公开(公告)日：2019-01-01

    申请号：US13300911

    申请日：2011-11-21

    申请人： Tadao Nomura ,  Norio Yamagata ,  Takehisa Minowa

    发明人： Tadao Nomura ,  Norio Yamagata ,  Takehisa Minowa

    IPC分类号： H01L21/30 ,  C30B29/36 ,  C30B9/10 ,  C30B11/04

    摘要： A method of producing a SiC single crystal includes: disposing a SiC seed crystal at a bottom part inside a graphite crucible; causing a solution containing Si, C and R (R is at least one selected from the rare earth elements inclusive of Sc and Y) or X (X is at least one selected from the group consisting of Al, Ge, Sn, and transition metals exclusive of Sc and Y) to be present in the crucible; supercooling the solution so as to cause the SiC single crystal to grow on the seed crystal; and adding powdery or granular Si and/or SiC raw material to the solution from above the graphite crucible while keeping the growth of the SiC single crystal.

    Rare earth permanent magnet and its preparation
    10.
    发明授权
    Rare earth permanent magnet and its preparation 有权
    稀土永磁铁及其制备方法

    公开(公告)号：US07985303B2

    公开(公告)日：2011-07-26

    申请号：US12913252

    申请日：2010-10-27

    申请人： Hiroaki Nagata ,  Tadao Nomura ,  Takehisa Minowa

    发明人： Hiroaki Nagata ,  Tadao Nomura ,  Takehisa Minowa

    IPC分类号： H01F1/057

    CPC分类号： H01F1/0577 ,  C22C33/0278 ,  C22C38/002 ,  C22C38/005 ,  C22C38/10 ,  C22C2202/02 ,  H01F41/0293

    摘要： A rare earth permanent magnet is prepared by disposing a powdered metal alloy containing at least 70 vol % of an intermetallic compound phase on a sintered body of R—Fe—B system, and heating the sintered body having the powder disposed on its surface below the sintering temperature of the sintered body in vacuum or in an inert gas for diffusion treatment. The advantages include efficient productivity, excellent magnetic performance, a minimal or zero amount of Tb or Dy used, an increased coercive force, and a minimized decline of remanence.

    摘要翻译： 通过在R-Fe-B体系的烧结体上配置含有至少70体积％的金属间化合物相的粉末状金属合金，并且将其表面上设置的粉末的烧结体加热而制备稀土永磁体 在真空中或惰性气体中进行扩散处理的烧结体的烧结温度。 优点包括有效的生产率，优异的磁性能，使用的Tb或Dy的最小或零量，增加的矫顽力和最小的剩磁衰减。