Magnetic iron oxide pigments and a process for their preparation
    1.
    发明授权
    Magnetic iron oxide pigments and a process for their preparation 失效
    磁性氧化铁颜料及其制备方法

    公开(公告)号:US4933014A

    公开(公告)日:1990-06-12

    申请号:US90929

    申请日:1987-08-31

    IPC分类号: C01G49/00 G11B5/706 H01F1/11

    CPC分类号: G11B5/70647 Y10T428/2991

    摘要: Magnetic iron oxide pigments useful in magnetic signal recordings having a dependence of coercivity on temperature in the temperature range of from 76K to 298K of less than 0.13 kA/mK and having a coercivity on powder compressed to 0.9 g/cm.sup.3 of greater than 51 kA/m are prepared by coating a magnetic iron oxide core material having the composition FeO.sub.x where x is a number from 1.33 to 1.5 in a first step with a compound containing divalent and trivalent iron having a ratio of Fe(III): Fe(II) from 0.01 to less than 2, and then in a second step coating the pre-coated core with a second coating of a cobalt compound.

    摘要翻译: 磁性氧化铁颜料可用于具有小于0.13kA / mK的76K至298K的温度范围内矫顽力与温度相关的磁信号记录,并且具有压缩至0.9g / cm 3的粉末矫顽力大于51kA / m是通过在第一步中用含有Fe(III):Fe(II)的二价和三价铁的化合物涂覆具有组成FeO x的磁性氧化铁芯材料,其中x为1.33至1.5, 0.01至小于2,然后在第二步中用钴化合物的第二涂层涂覆预涂芯。

    Magnetic iron oxide pigments and a process for their preparation
    2.
    发明授权
    Magnetic iron oxide pigments and a process for their preparation 失效
    磁性氧化铁颜料及其制备方法

    公开(公告)号:US4923519A

    公开(公告)日:1990-05-08

    申请号:US91059

    申请日:1987-08-31

    IPC分类号: C01G49/00 G11B5/706 H01F1/11

    CPC分类号: G11B5/70647 Y10T428/2991

    摘要: Magnetic iron oxide pigments having a monomolecular coating of a cobalt compound useful in magnetic signal recordings having a dependence of coercivity on temperature in the temperature range of from 76 K to 298 K of less than 0.13 kA/mK and having a coercivity on powder compressed to 0.9 g/cm.sup.3 of greater than 51 kA/m are prepared applying a preliminary coating of Fe.sub.3 O.sub.4 or a bertholloid compound to a magnetic iron oxide core material having the composition FeO.sub.x where x is a number from 1.33 to 1.55 and then covering the preliminary coating with a cobalt compound.

    摘要翻译: 具有钴化合物的单分子涂层的磁性氧化铁颜料,其可用于在76K至298K的温度范围内的矫顽力与温度的相关性小于0.13kA / mK的磁信号记录,并且具有压缩至 制备大于51kA / m 3的0.9g / cm 3,其中将Fe 3 O 4或硼氢化合物的初步涂层施加到具有FeO x组成的磁性氧化铁芯材料,其中x为1.33至1.55的数值,然后用 钴化合物。

    METALLIC POWDER MIXTURES
    7.
    发明申请
    METALLIC POWDER MIXTURES 审中-公开
    金属粉末混合物

    公开(公告)号:US20100003157A1

    公开(公告)日:2010-01-07

    申请号:US12373324

    申请日:2007-07-09

    摘要: The invention relates to mixtures of metal, alloy or composite powders which have a mean particle diameter D50 of not more than 75 μm, preferably not more than 25 μm, and are produced in a process in which a starting powder is firstly deformed to give platelet-like particles and these are then comminuted in the presence of milling aids together with further additives and also the use of these powder mixtures and shaped articles produced therefrom.

    摘要翻译: 本发明涉及平均粒径D50不大于75μm,优选不超过25μm的金属,合金或复合粉末的混合物,并且是以首先变形起始粉末以产生血小板的方法生产的 然后在研磨助剂和其它添加剂的存在下粉碎这些颗粒,并且还使用由其制备的这些粉末混合物和成型制品。