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    Manufacture of acicular cobalt-modified magnetic iron oxide
    2.
    发明授权
    Manufacture of acicular cobalt-modified magnetic iron oxide 失效
    针状钴改性磁性氧化铁的制造

    公开(公告)号：US4188302A

    公开(公告)日：1980-02-12

    申请号：US872262

    申请日：1978-01-25

    申请人： Hans-Juergen Becker ,  Christof Jaeckh ,  Eberhard Koester ,  Werner Loeser ,  Manfred Ohlinger ,  Werner Steck

    发明人： Hans-Juergen Becker ,  Christof Jaeckh ,  Eberhard Koester ,  Werner Loeser ,  Manfred Ohlinger ,  Werner Steck

    IPC分类号： C01G49/02 ,  C01G49/00 ,  C01G49/06 ,  G11B5/706 ,  H01F1/11

    CPC分类号： C01G49/06 ,  G11B5/70663 ,  G11B5/70673 ,  G11B5/70694 ,  C01P2002/54 ,  C01P2004/10 ,  C01P2006/10 ,  C01P2006/42

    摘要： A process for the manufacture of an acicular magnetic iron oxide containing from 0.5 to 10 percent by weight of cobalt and up to 24 percent by weight of divalent iron, each based on the amount of iron(III) oxide, wherein an aqueous suspension of gamma-iron(III) oxide, containing cobalt(II) and iron(II) ions, the suspension having a hydroxyl ion concentration of more than 3.6.times.10.sup.-6 moles/liter, is heated at from 50.degree. to 100.degree. C. for at least 15 minutes, and the resulting precipitate is filtered off, washed until neutral, dried at below 100.degree. C. and thereafter heated at from 100.degree. to 200.degree. C.The products thus obtained give, even when their cobalt content is low, a very high coercive force, while the effect of temperature on the coercive force and residual induction is very slight.

    摘要翻译： 一种用于制造针状磁性氧化铁的方法，其含有0.5至10重量％的钴和至多24重量％的二价铁，每个基于氧化铁（III）的量，其中γ 氧化铁（III），含有钴（II）和铁（II）离子，羟基离子浓度大于3.6×10 -6摩尔/升的悬浮液在50℃至100℃下加热至 至少15分钟，滤出所得沉淀物，洗涤至中性，在100℃以下干燥，然后在100〜200℃下加热。由此得到的产物即使在钴含量低的情况下也能得到 矫顽力非常高，而温度对矫顽力和残余感应的影响非常小。

    Manufacture of acicular cobalt-containing magnetic iron oxide
    4.
    发明授权
    Manufacture of acicular cobalt-containing magnetic iron oxide 失效
    针状钴磁性氧化铁的制造

    公开(公告)号：US4287233A

    公开(公告)日：1981-09-01

    申请号：US116543

    申请日：1980-01-29

    申请人： Peter Rudolf ,  Werner Steck ,  Eberhard Koester ,  Manfred Ohlinger ,  Christof Jaeckh

    发明人： Peter Rudolf ,  Werner Steck ,  Eberhard Koester ,  Manfred Ohlinger ,  Christof Jaeckh

    IPC分类号： G11B5/706 ,  C01G49/06

    CPC分类号： G11B5/70657

    摘要： A process for the manufacture of acicular magnetic iron oxide consisting of core of gamma-iron(III) oxide and a ferrite shell which contains, based on the total amount of magnetic material, from 0.2 to 12 per cent by weight of cobalt(II) ions and from 0.1 to 15 per cent by weight of iron(II) ions, wherein a precipitate of cobalt(II) hydroxide and iron (II) hydroxide is applied to acicular gamma-iron(III) oxide particles and the latter are heated at 100.degree.-200.degree. C.

    摘要翻译： 制造由γ-铁（III）氧化物核心和铁氧体壳组成的针状磁性氧化铁的方法，其包含基于磁性材料总量的0.2至12重量％的钴（II） 离子和0.1至15重量％的铁（II）离子，其中将氢氧化钴（II）和氢氧化铁（II）的沉淀物施加到针状γ-铁（III）氧化物颗粒上，并将后者加热至 100℃-200℃

    Manufacture of acicular ferromagnetic iron particles
    6.
    发明授权
    Manufacture of acicular ferromagnetic iron particles 失效
    针状铁磁铁颗粒的制造

    公开(公告)号：US4178171A

    公开(公告)日：1979-12-11

    申请号：US888508

    申请日：1978-03-20

    申请人： Werner Steck ,  Rudolf Brodt ,  Wilhelm Sarnecki ,  Helmut Jakusch ,  Manfred Ohlinger ,  Eberhard Koester

    发明人： Werner Steck ,  Rudolf Brodt ,  Wilhelm Sarnecki ,  Helmut Jakusch ,  Manfred Ohlinger ,  Eberhard Koester

    IPC分类号： G11B5/706 ,  B22F9/22 ,  C09D5/23 ,  C09D7/12 ,  C21B15/00 ,  G11B5/712 ,  G11B5/714 ,  H01F1/06 ,  B22F9/00

    CPC分类号： H01F1/065 ,  B22F9/22 ,  C21B15/00 ,  G11B5/714

    摘要： A process for the manufacture of acicular ferromagnetic iron particles by reducing acicular iron(III) oxide hydroxides which consist of pure synthetic lepidocrocite or a mixture of synthetic goethite and at least 70% by weight of synthetic lepidocrocite.The iron(III) oxide hydroxides used carry, on their surface, an alkaline earth metal cation and an anion of a monobasic, dibasic or tribasic aliphatic carboxylic acid of up to 6 carbon atoms or an organic compound containing at least two groups capable of chelating the alkaline earth metal cation, and are produced in such a way that they consist of at least 70 percent by weight of lepidocrocite and have a length-to-width ratio of not less than 15:1.Reduction of such iron(III) oxide hydroxides gives iron particles with pronounced shape anisotropy, which exhibit both good magnetic properties and a narrow field strength distribution.

    摘要翻译： 通过还原针状铁（III）氢氧化物来制造针状铁磁性铁粒子的方法，该针状铁氧化物由纯合成锂铁矿石或合成针铁矿和至少70％重量的合成锂铁矿石混合物组成。 所用的氧化铁（III）氢氧化物在其表面上带有至多6个碳原子的一元，二元或三元脂肪族羧酸的碱土金属阳离子和阴离子，或含至少两个能够螯合的基团的有机化合物 碱土金属阳离子，并且以这样的方式制备，使得它们由至少70重量％的氯铁矿石组成，并且具有不小于15:1的长宽比。 这种氧化还原铁（III）氢氧化物的还原产生具有显着形状各向异性的铁颗粒，其具有良好的磁性能和窄的场强分布。