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41 条记录 (耗时 0.012 秒)

    Ferromagnetic powder, and coating material and magnetic recording medium using same
    1.
    发明授权
    Ferromagnetic powder, and coating material and magnetic recording medium using same 有权
    铁磁粉末，涂料和使用磁记录介质的材料

    公开(公告)号：US07763352B2

    公开(公告)日：2010-07-27

    申请号：US11520624

    申请日：2006-09-14

    申请人： Yoshiyuki Shoji ,  Toshihiko Ueyama

    发明人： Yoshiyuki Shoji ,  Toshihiko Ueyama

    IPC分类号： G11B5/66

    CPC分类号： H01F1/09 ,  G11B5/70621 ,  G11B5/70647 ,  G11B5/70657 ,  G11B5/70663 ,  G11B5/70689 ,  G11B5/714 ,  H01F1/065 ,  Y10T428/2982 ,  Y10T428/32

    摘要： A magnetic powder is provided composed of particles having a balanced shape and distribution, the particles having a small, uniform volume, making it possible to achieve improved density and reliability of a coating type magnetic recording medium. The magnetic powder has Fe as a main component, and is comprised of particles having a cross-section perpendicular to the particle major axis that is substantially round or elliptical, wherein a standard geometrical deviation indicating the variation in cross-sectional area thereof is within the range of 1.01 to 3.0. The invention is also directed to a magnetic powder in which the standard geometrical deviation indicating the variation in the particle volume is within the range of 1.01 to 4.0, and the standard geometrical deviation indicating variation in the flat acicularity is within 1.01 to 2.0.

    摘要翻译： 由具有平衡形状和分布的颗粒构成的磁粉由于具有体积小，体积均匀的粒子，能够提高涂布型磁记录介质的密度和可靠性。 该磁性粉末以Fe为主成分，由具有垂直于大致圆形或椭圆形的粒子长轴的截面的粒子构成，其中，表示其横截面积的变化的标准几何偏差在 范围为1.01〜3.0。 本发明还涉及一种磁性粉末，其中指示颗粒体积变化的标准几何偏差在1.01至4.0的范围内，并且指示平针对性变化的标准几何偏差在1.01至2.0之内。

    Improving the magnetic properties of gamma-iron (III) oxide
    4.
    发明授权
    Improving the magnetic properties of gamma-iron (III) oxide 失效
    提高γ-铁（III）氧化物的磁性能

    公开(公告)号：US4212903A

    公开(公告)日：1980-07-15

    申请号：US770989

    申请日：1977-02-22

    申请人： Georg Schnell ,  Fritz Hammon ,  Manfred Ohlinger

    发明人： Georg Schnell ,  Fritz Hammon ,  Manfred Ohlinger

    IPC分类号： G11B5/706 ,  H01F10/00 ,  B05D5/12

    CPC分类号： G11B5/70647 ,  G11B5/70652 ,  G11B5/70657 ,  Y10S428/90

    摘要： The invention relates to a process for improving the magnetic properties, especially the remanent magnetization, of gamma-iron(III) oxide which can be used advantageously as the magnetic component in magnetic recording media exhibiting reduced print-through. For this purpose, a gamma-iron(III) oxide manufactured according to known processes is heated at temperatures of from 400.degree. to 700.degree. C., the magnetic pigment having basic compounds on the crystal surface during this heat treatment and retaining a pH value above 8 until heating is over. Gamma-iron(III) oxide magnetic pigments treated in this way are particularly suitable for the manufacture of low-noise magnetic recording media with high remanent magnetization and particularly low print-through.

    摘要翻译： 本发明涉及一种用于改善氧化铁（III）的磁性能，特别是剩余磁化的方法，该方法可以有利地用作磁记录介质中的磁性组分，这些磁性组分表现出减少的打印通量。 为此，根据已知方法制造的γ-铁（III）氧化物在400℃至700℃的温度下加热，该磁性颜料在该热处理期间在晶体表面上具有碱性化合物，并保持pH值 高于8，直到加热结束。 以这种方式处理的氧化镍（III）磁性颜料特别适用于制造具有高剩余磁化强度和特别是低打印通量的低噪声磁记录介质。

    Process for making iron oxide of controlled particle size
    5.
    发明授权
    Process for making iron oxide of controlled particle size 失效
    制造受控粒径的氧化铁的方法

    公开(公告)号：US4201761A

    公开(公告)日：1980-05-06

    申请号：US918215

    申请日：1978-06-23

    申请人： Walter H. Seitzer

    发明人： Walter H. Seitzer

    IPC分类号： C01G49/06 ,  G11B5/706 ,  C01G49/02

    CPC分类号： B82Y30/00 ,  C01G49/06 ,  G11B5/70657 ,  C01P2004/61 ,  C01P2004/62 ,  C01P2004/64

    摘要： A process for preparing iron oxide with a controlled purity and large particle size which comprises oxidizing at a constant pH a vigorously agitated aqueous suspension of iron oxide crystals while continuously, but slowly adding a water soluble iron solution and continuously withdrawing a portion of the aqueous solution containing large size iron oxide crystals as product.

    摘要翻译： 一种制备具有可控纯度和大粒度的氧化铁的方法，其包括在恒定pH下氧化氧化铁晶体的剧烈搅拌的水悬浮液，同时连续地缓慢加入水溶性铁溶液并连续抽出一部分水溶液 含有大型氧化铁晶体作为产品。

    Process for producing magnetic powder and product
    10.
    发明授权
    Process for producing magnetic powder and product 失效
    磁粉和制品生产工艺

    公开(公告)号：US4539261A

    公开(公告)日：1985-09-03

    申请号：US482225

    申请日：1983-04-05

    申请人： Kazuo Nakata ,  Masatsuyo Maruo ,  Kiyoshi Asano

    发明人： Kazuo Nakata ,  Masatsuyo Maruo ,  Kiyoshi Asano

    IPC分类号： H01F1/11 ,  C09C1/24 ,  G11B5/706 ,  B32B3/16

    CPC分类号： C09C1/24 ,  G11B5/70657 ,  C01P2006/12 ,  C01P2006/42 ,  Y10T428/2991

    摘要： A process for producing a magnetic powder which comprises coating the particle surfaces of a magnetic iron oxide with a cobalt compound or a cobalt compound and a ferrous compound and further coating with a compound of at least one metal selected from the group consisting of manganese, vanadium and zinc. There is obtained a magnetic powder having high coercivity and excellent dispersibility in organic binders. This magnetic powder is useful as a material for recording media such as magnetic tapes.

    摘要翻译： 一种制造磁粉的方法，包括用钴化合物或钴化合物和亚铁化合物涂覆磁性氧化铁的颗粒表面，并进一步用至少一种选自锰，钒的金属的化合物 和锌。 得到矫顽磁力高，分散性好的有机粘结剂的磁性粉末。 该磁性粉末作为用于记录诸如磁带的介质的材料是有用的。