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    Ferromagnetic metal powder
    5.
    发明授权
    Ferromagnetic metal powder 失效
    铁磁金属粉末

    公开(公告)号：US5591535A

    公开(公告)日：1997-01-07

    申请号：US432467

    申请日：1995-05-01

    申请人： Seiichi Hisano ,  Kazuhisa Saito ,  Satoshi Aizawa ,  Kazushi Sano ,  Kazuyuki Matsumoto ,  Kenji Murata

    发明人： Seiichi Hisano ,  Kazuhisa Saito ,  Satoshi Aizawa ,  Kazushi Sano ,  Kazuyuki Matsumoto ,  Kenji Murata

    IPC分类号： G11B5/706 ,  H01F1/047 ,  H01F1/055 ,  G11B5/66

    CPC分类号： H01F1/055 ,  G11B5/70615 ,  G11B5/70621 ,  H01F1/047

    摘要： There is provided an accicular ferromagnetic metal powder with which one can produce magnetic media for high-density recording that are improved in storage stability and magnetic characteristics.The improved ferromagnetic metal powder essentially consists of iron and 50 atm % based on the amount of iron of cobalt and at least one of aluminum and yttrium or any other rare earth element and contains no more than 0.05 wt % of an element of Group Ia of the periodic table (Li, Na, K). The amount of aluminum is in the range of 0.1-30 atm %, the amount of yttrium or any other rare earth element is in the range of and 0.1-10 atm %, each being based on the total quantity of the metal elements present. In either of these cases, the residue of an element of Group IIa of the periodic table (Mg, Ca, Sr, Ba) is preferably 0.1 wt % or less.

    摘要翻译： 提供了一种指状铁磁金属粉末，可以制造高密度记录的磁性介质，其具有改善的储存稳定性和磁特性。 改进的铁磁性金属粉末基于铁和50atm％，基于钴的量和铝和钇或任何其它稀土元素中的至少一种，并且含有不超过0.05wt％的Ia族元素 周期表（Li，Na，K）。 铝的量在0.1-30atm％的范围内，钇或任何其它稀土元素的量在0.1-10atm％的范围内，各自以所存在的金属元素的总量为基准。 在这些情况下，元素周期表IIa族元素（Mg，Ca，Sr，Ba）的残基优选为0.1重量％以下。

    Ferromagnetic powder
    6.
    发明授权
    Ferromagnetic powder 有权
    铁磁粉

    公开(公告)号：US06506264B1

    公开(公告)日：2003-01-14

    申请号：US09601942

    申请日：2000-08-10

    申请人： Seiichi Hisano ,  Kazuhisa Saito ,  Kazushi Sano ,  Akio Sawabe ,  Akito Inoue ,  Kenichi Inoue

    发明人： Seiichi Hisano ,  Kazuhisa Saito ,  Kazushi Sano ,  Akio Sawabe ,  Akito Inoue ,  Kenichi Inoue

    IPC分类号： H01F1055

    CPC分类号： H01F1/06 ,  B22F1/0011 ,  C22C33/0285 ,  G11B5/70621 ,  G11B5/714

    摘要： A ferromagnetic powder containing iron as the principal component and containing more than 5 to 50 at. % Co, 0.1 to 30 at. % Al, 0.1 to 10 at. % of a rare earth element inclusive of Y, 0.05% by weight or less of an element belonging to Group 1a of the Periodic Table, and 0.1% by weight or less (inclusive of 0% by weight) of an element belonging to Group 2a of the Periodic Table, the powder comprising flat acicular particles having a mean major axis length of 0.01 to 0.40 &mgr;m and a crystallite diameter as determined by X-ray diffraction (Dx) of 50 to 250 angstrom, provided that the cross section diameter in the minor axis direction cut perpendicular to the major axis has a larger width and a smaller width, and that this cross section ratio in the minor axis direction, which is a larger width to smaller width ratio, uniformly yields a value of greater than 1, preferably 1.5 or higher, and the powder yielding a &sgr;s/Dx ratio of 0.7 or higher, wherein, &sgr;s represents the saturation magnetization and Dx represents the crystallite size determined by X-ray diffraction.

    摘要翻译： 含有铁作为主要成分并含有5〜50个以上的铁磁粉末。 ％Co，0.1〜30at。 ％Al，0.1〜10at。 含有Y的稀土元素的％，属于元素周期表的第1a族的元素的0.05重量％以下，属于第2a族的元素的0.1重量％以下（包括0重量％） 的周期表的粉末，该粉末包含平均长轴长度为0.01至0.40μm的扁平针状颗粒和通过X射线衍射测定的微晶直径（Dx）为50至250埃，条件是在 垂直于长轴的短轴方向具有较大的宽度和较小的宽度，并且短径方向上的宽度与宽度比较大的横截面比均匀地产生大于1的值，优选地 1.5或更高，并且产生0.7或更高的sigmas / Dx比的粉末，其中sigmas表示饱和磁化强度，Dx表示通过X射线衍射确定的微晶尺寸。

    Ferromagnetic metal powder
    7.
    发明授权
    Ferromagnetic metal powder 失效
    铁磁金属粉末

    公开(公告)号：US5534361A

    公开(公告)日：1996-07-09

    申请号：US266227

    申请日：1994-06-27

    申请人： Seiichi Hisano ,  Kazuhisa Saito ,  Satoshi Aizawa ,  Kazushi Sano ,  Kazuyuki Matsumoto ,  Kenji Murata

    发明人： Seiichi Hisano ,  Kazuhisa Saito ,  Satoshi Aizawa ,  Kazushi Sano ,  Kazuyuki Matsumoto ,  Kenji Murata

    IPC分类号： C22C38/00 ,  G11B5/706 ,  H01F1/047 ,  H01F1/055 ,  G11B5/66

    CPC分类号： H01F1/055 ,  G11B5/70615 ,  G11B5/70621 ,  H01F1/047

    摘要： There is provided a metallic magnetic powder with which one can produce magnetic media for high-density recording that are improved in storage stability and magnetic characteristics.The improved ferromagnetic metal powder contains no more than 0.05 wt % of an element of Group Ia of the periodic table. The powder may optionally contain 0.1-30 atm % of aluminum and/or 0.1-10 atm % of Y or any other rare earth element based on the total quantity of the metal elements present. In either of these cases, the residue of an element of Group IIa of the periodic table is preferably 0.1 wt % or less.

    摘要翻译： 提供了一种金属磁性粉末，通过该金属磁性粉末可以产生用于高密度记录的磁性介质，其提高了储存稳定性和磁特性。 改进的铁磁性金属粉末含有不超过0.05重量％的元素周期表第Ia族元素。 基于存在的金属元素的总量，粉末可以任选地含有0.1-30atm％的铝和/或0.1-10atm％的Y或任何其它稀土元素。 在这些情况中的任一种情况下，周期表IIa族的元素的残基优选为0.1重量％以下。

    Process for production of permanent magnet alloy having improved resistence to oxidation
    9.
    发明授权
    Process for production of permanent magnet alloy having improved resistence to oxidation 失效
    具有改善的耐氧化性的永磁体合金的制造方法

    公开(公告)号：US5183630A

    公开(公告)日：1993-02-02

    申请号：US710800

    申请日：1991-06-04

    申请人： Toshio Ueda ,  Yuichi Sato ,  Masayasu Senda ,  Seiji Isoyama ,  Seiichi Hisano

    发明人： Toshio Ueda ,  Yuichi Sato ,  Masayasu Senda ,  Seiji Isoyama ,  Seiichi Hisano

    IPC分类号： C22C1/04 ,  H01F1/057 ,  H01F1/058

    CPC分类号： H01F1/0572 ,  C22C1/0441 ,  H01F1/0577 ,  H01F1/058

    摘要： A process for producing a permanent magnet alloy based on a R--Fe--B--C system wherein R is at least one of the rare earth elements including Y, comprising the steps of preparing a molten crude alloy, producing a powder directly therefrom or after casting it into an alloy ingot and then grinding it into the powder, compacting the thus obtained powder and sintering the compacted product, the ingot or powder of the alloy before being sent to the compacting step being subjected to a heat treatment which is carried out at a temperature of 500.degree.-1,100.degree. C. for a period of 0.5 hour or more so as to produce a permanent magnet alloy based on an a R--Fe--B--C system whose individual magnetic crystal grains are covered with an oxidation-resistant protective film which has a C content higher than that of the individual crystal grains.

    摘要翻译： 一种用于制造基于R-Fe-BC体系的永磁体合金的方法，其中R是包括Y的稀土元素中的至少一种，包括制备熔融粗合金的步骤，直接由其制备粉末或在浇铸之后 然后将其研磨成粉末，压实由此获得的粉末，并将压实产品，锭或锭合金烧结，然后送入压实步骤进行热处理，该热处理在温度 在500-1100℃下加热0.5小时或更长的时间，以便制备基于R-Fe-BC系统的永磁体合金，其中各个磁性晶粒被抗氧化保护膜覆盖，所述抗氧化保护膜具有 C含量高于单个晶粒的C含量。