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    Process for producing ferromagnetic metal powder
    1.
    发明授权
    Process for producing ferromagnetic metal powder 失效
    铁磁性金属粉末生产工艺

    公开(公告)号：US4101311A

    公开(公告)日：1978-07-18

    申请号：US820951

    申请日：1977-08-01

    申请人： Masashi Aonuma ,  Yasuo Tamai ,  Fumio Kodama

    发明人： Masashi Aonuma ,  Yasuo Tamai ,  Fumio Kodama

    IPC分类号： B22F9/24 ,  G11B5/706 ,  H01F1/06

    CPC分类号： H01F1/065 ,  B22F9/24 ,  G11B5/70615 ,  G11B5/70621 ,  Y10T428/31507 ,  Y10T428/31681

    摘要： A ferromagnetic metal powder having a narrow distribution of coercive force produced by reducing a salt of a metal capable of forming a ferromagnetic material as an aqueous solution thereof, where the reducing reaction is carried out while maintaining the temperature of the aqueous solution during and/or after the reduction reaction at about 20.degree. C higher than the temperature or less of the aqueous solution at the immediate beginning of the reduction reaction.

    摘要翻译： 一种铁磁性金属粉末，其具有通过将能形成铁磁材料的金属的盐作为其水溶液进行还原而产生的矫顽力分布，其中进行还原反应同时保持水溶液的温度和/或 在还原反应后，在还原反应开始后约20℃的还原反应高于水溶液的温度或更低。

    Process for production of ferromagnetic powder and apparatus therefor
    2.
    发明授权
    Process for production of ferromagnetic powder and apparatus therefor 失效
    铁磁粉末生产方法及其设备

    公开(公告)号：US4141763A

    公开(公告)日：1979-02-27

    申请号：US784747

    申请日：1977-04-05

    申请人： Masashi Aonuma ,  Yasuo Tamai ,  Tatsuji Kitamoto ,  Fumio Kodama

    发明人： Masashi Aonuma ,  Yasuo Tamai ,  Tatsuji Kitamoto ,  Fumio Kodama

    IPC分类号： B22F9/24 ,  H01F1/06

    CPC分类号： B22F9/24 ,  H01F1/065

    摘要： A process for producing a ferromagnetic powder comprising injecting a stream of an aqueous solution of a metal salt capable of forming a ferromagnetic substance and a stream of solution containing a reducing material for mixing into a reaction chamber such that the two solutions impinge upon one another causing an oxidation-reduction reaction between them to occur, and applying a magnetic field of 50 oe or more to the particles produced by the oxidation-reduction reaction for the period during which the particles become ferromagnetic particles after going through a superparamagnetic state and an apparatus for use in the practice of the above process comprising a reaction vessel, at least one nozzle for injecting each of a solution of a metal salt and a solution containing a reducing material into the reaction vessel and a magnet for producing a magnetic field in the reaction vessel with the nozzles being open to the magnetic field and positioned so that the solution of the metal salt and the solution of the reducing material when injected are mixed.

    摘要翻译： 一种制造铁磁粉末的方法，包括将能形成铁磁性物质的金属盐的水溶液流和含有还原材料的溶液流混合到反应室中，使得两种溶液彼此撞击导致 在它们之间发生氧化还原反应，并且在通过超顺磁性状态的颗粒变成铁磁颗粒的时期之后，对由氧化还原反应产生的颗粒施加50ee或更大的磁场， 用于上述方法的实践中，包括反应容器，用于将金属盐溶液和含有还原材料的溶液中的每一个注入反应容器的至少一个喷嘴和用于在反应容器中产生磁场的磁体 其中喷嘴对磁场开放并且定位成使得金属盐a的溶液 并且当注入时将还原材料的溶液混合。

    Magnetic recording medium
    3.
    发明授权
    Magnetic recording medium 失效
    磁记录介质

    公开(公告)号：US4847147A

    公开(公告)日：1989-07-11

    申请号：US129922

    申请日：1987-12-03

    申请人： Masashi Aonuma ,  Masaaki Suzuki ,  Yasuo Tamai

    发明人： Masashi Aonuma ,  Masaaki Suzuki ,  Yasuo Tamai

    IPC分类号： C09D5/23 ,  C09D7/12 ,  G11B5/716

    CPC分类号： G11B5/716 ,  Y10S428/90 ,  Y10T428/257 ,  Y10T428/265

    摘要： A magnetic recording medium is disclosed which comprises a non-magnetic support having coated thereon two magnetic layers, wherein an under layer of the magnetic layers contains ferromagnetic metal particles having a coercive force of 550 to 700 Oe, and wherein an upper layer of the magnetic layers contains a ferromagnetic particles having a specific surface area determined by the BET method of 25 to 35 m.sup.2 /g, a coercive force of 700 to 800 Oe and a thickness of 0.5 to 2.5 .mu.m, wherein the entire magnetic layer including the upper layer and the under layer have a coervice force of 580 to 750 Oe, a residual magnetic flux density of 2200 to 3200 gauss and a thickness of 3.0 to 5.0 .mu.m.

    摘要翻译： 公开了一种磁记录介质，其包括其上涂覆有两个磁性层的非磁性载体，其中磁性层的下层包含矫顽力为550-700Oe的强磁性金属颗粒，并且其中磁性层的上层 层包含通过BET法测定的比表面积为25〜35m 2 / g，矫顽力为700〜800Oe，厚度为0.5〜2.5μm的铁磁性粒子，其中，包含上层的整个磁性层 下层具有580〜750Oe的强度，剩余磁通密度为2200〜3200高斯，厚度为3.0〜5.0μm。

    Magnetic recording medium
    8.
    发明授权
    Magnetic recording medium 失效
    磁记录介质

    公开(公告)号：US3943012A

    公开(公告)日：1976-03-09

    申请号：US498337

    申请日：1974-08-19

    申请人： Yasuo Tamai ,  Masashi Aonuma ,  Matsuaki Nakamura ,  Hiroshi Agawa ,  Goro Akashi

    发明人： Yasuo Tamai ,  Masashi Aonuma ,  Matsuaki Nakamura ,  Hiroshi Agawa ,  Goro Akashi

    IPC分类号： C09D5/23 ,  C09D7/12 ,  G11B5/706 ,  H01F1/047 ,  H01F1/02

    CPC分类号： G11B5/70615 ,  G11B5/70621

    摘要： A magnetic recording medium for high density recording comprising a support having thereon a magnetic recording layer comprising a ferromagnetic metal powder of the Fe-Co-Cr-B system and having a coercive force of about 700 to 500 oersteds in the oriented direction of the magnetic substance and a residual magnetic flux density of about 1500 gausses or more, the residual magnetic flux density of which after storage for 160 hours under the conditions of a temperature of 60.degree.C and 90%RH is 85% or more of the initial value thereof before storage under these conditions in a binder. The magnetic recording medium is especially suitable for high density recording, having sufficient sensitivity and excellent resistance.

    摘要翻译： 一种用于高密度记录的磁记录介质，包括其上具有包含Fe-Co-Cr-B系统的铁磁金属粉末的磁记录层的支撑体，并且在磁性方向上具有约700至500奥斯特的矫顽力 物质和约1500高斯或更高的剩余磁通密度，其在60℃和90％RH的温度条件下储存160小时后的剩余磁通密度为其初始值的85％或更多 在这些条件下在粘合剂中储存之前。 磁记录介质特别适用于高密度记录，具有足够的灵敏度和优异的电阻。

    Magnetic recording medium
    10.
    发明授权
    Magnetic recording medium 失效
    磁记录介质

    公开(公告)号：US4246316A

    公开(公告)日：1981-01-20

    申请号：US887766

    申请日：1978-03-17

    申请人： Masashi Aonuma ,  Yasuo Tamai

    发明人： Masashi Aonuma ,  Yasuo Tamai

    IPC分类号： C09D5/23 ,  C09D7/12 ,  G11B5/716 ,  H01F1/06

    CPC分类号： G11B5/716 ,  Y10S428/90 ,  Y10T428/12049 ,  Y10T428/12569 ,  Y10T428/257 ,  Y10T428/265 ,  Y10T428/2936

    摘要： This invention relates to a magnetic recording medium comprising a non-magnetic support and magnetic layer provided thereon containing a ferromagnetic metal powder, the magnetic layer having a multilyaer structure consisting of a lower layer containing acicular grains obtained by dry process reduction and an upper layer containing chain-like grains obtained by wet process reduction, the upper layer being provided on the lower layer. This magnetic recording medium is particularly suitable for high density recording.

    摘要翻译： 本发明涉及一种包含非磁性载体和磁性层的磁记录介质，其中含有强磁性金属粉末，该磁性层具有多层结构，该多层结构由含有通过干法还原获得的针状颗粒的下层和含有 通过湿法还原获得的链状颗粒，上层设置在下层上。 该磁记录介质特别适用于高密度记录。