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11.发明授权Process for producing ferrogmagnetic iron oxide powder comprising a pre-treatment with a reducing agent 失效包含用还原剂进行预处理的铁磁性氧化铁粉末的制造方法
公开(公告)号：US4125474A
公开(公告)日：1978-11-14
申请号：US710813
申请日：1976-08-02
CPC分类号： G11B5/70673 , G11B5/70642
摘要： In a process for producing a ferromagnetic powder having a high coercive force which comprises adding an aqueous solution containing Co.sup.+2 ions, or both Co.sup.+2 ions and another cation(s), and an alkali solution to a suspension of a ferromagnetic iron oxide containing the metal(s) given by these ion(s), the improvement wherein said ferromagnetic iron oxide is treated with a reducing agent prior to the preparation of the suspension.
摘要翻译： 在制备具有高矫顽力的铁磁性粉末的方法中，该方法包括将含有Co +2离子或Co + 2离子和另一种阳离子的水溶液和碱溶液加入到铁磁性氧化铁 含有这些离子给出的金属的改进，其中所述铁磁性氧化铁在制备悬浮液之前用还原剂处理。
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公开(公告)号：US4069164A
公开(公告)日：1978-01-17
申请号：US701914
申请日：1976-07-01
IPC分类号： C01G49/00 , C01G49/02 , C01G49/06 , C01G49/08 , C09D5/23 , C09D7/12 , G11B5/706 , H01F1/11 , G11B5/64
CPC分类号： G11B5/70689 , C01G49/06 , C01G49/08 , G11B5/70673 , C01P2006/42
摘要： In a process for producing ferromagnetic powder which comprises adding an aqueous solution containing Co.sup.+2 ions, with or without another cation or cations, and an alkali solution to a suspension of ferromagnetic iron oxide, and heating the mixture to produce ferromagnetic iron oxide containing the metal provided by such an ion (s), the improvement wherein the heating is carried out in the presence of an oxidizing agent.
摘要翻译： 在制备铁磁性粉末的方法中，该方法包括将含有Co +2离子的水溶液（含有或不含有其它阳离子或阳离子）和碱溶液加入到铁磁性氧化铁悬浮液中，并加热混合物以产生含铁 由这样的离子提供的金属，其中加热在氧化剂存在下进行。
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公开(公告)号：US4066565A
公开(公告)日：1978-01-03
申请号：US702172
申请日：1976-07-02
CPC分类号： G11B5/70673 , C01G49/06 , G11B5/70642 , C01P2006/42
摘要： Co- and Fe-containing ferromagnetic iron oxide powder having a high coercive force and improved stability to heat and pressure is produced by adding an aqueous alkali solution, an aqueous solution containing Co.sup.+2 ions, and an aqueous solution containing not more than 1 equivalent, based on the Co.sup.+2 ions, of Fe.sup.+3 ions to a suspension of a ferromagnetic iron oxide, and heating the mixture at a temperature of at least about 80.degree. C, preferably 90.degree. to 105.degree. C. The ferromagnetic iron oxide powder is especially suitable for producing magnetic recording media.
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14.发明授权
公开(公告)号：US4982302A
公开(公告)日：1991-01-01
申请号：US179352
申请日：1988-04-08
CPC分类号： G11B5/02 , G11B5/00 , G11B5/716 , G11B5/78 , H04N5/78213
摘要： A method for magnetic recording and reproduction comprising the steps of: (1) magnetically multiple-recording signals on a magnetic recording medium comprising a support having thereon an upper magnetic recording layer comprising barium ferrite having an increased coercive force at 60.degree. C. or more and a lower magnetic recording layer comprising at least one of chromium dioxide and Co-modified iron oxide, having a decreased coercive force at 60.degree. C. or more, disposed between said upper magnetic recording layer and said support; (2) heating said magnetic recording layers prior to reproduction due to a reproducing head; and (3) reproducing said magnetically recorded signal from said heated magnetic recording medium which is multiple-recorded.
摘要翻译： 一种用于磁记录和再现的方法，包括以下步骤：（1）磁记录介质上的磁记录信号，该磁记录介质包括一个载体，其上有一个上磁记录层，该磁记录层包括在60℃以上矫顽力增加的钡铁氧体 以及设置在所述上部磁记录层和所述支撑体之间的包含二氧化铬和Co改性氧化铁中的至少一种，具有降低的矫顽力在60℃以上的低磁记录层; （2）由于再现头而在再现之前加热所述磁记录层; 和（3）从被记录的多个加热磁记录介质再现所述磁记录信号。
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公开(公告)号：US4179387A
公开(公告)日：1979-12-18
申请号：US862884
申请日：1977-12-21
申请人： Koji Sasazawa , Mahito Shimizu , Tatsuji Kitamoto
发明人： Koji Sasazawa , Mahito Shimizu , Tatsuji Kitamoto
CPC分类号： G11B5/70689 , G11B5/70626
摘要： A magnetic Fe oxide containing Co, and optionally, a divalent metal, in which the oxidation degree indicated by the following formula ranges from about 30% to 80%; ##EQU1## wherein y is the amount of the Co, plus the divalent metal if present, in atomic % contained in the magnetic Fe oxide, and R is the ratio of the divalent Fe ion to the total Fe ions;and a process for producing a magnetic Fe oxide containing Co, and optionally, a divalent metal, and having an oxidizing degree of about 30 to 80%, which comprises dehydrating and reducing goethite containing Co, and optionally, the divalent metal, to obtain magnetic containing Co, and optionally, a divalent metal, and oxidizing gradually the magnetite at a relatively low temperature of lower than about 100.degree. C.
摘要翻译： 含有Co和任选的二价金属的磁性Fe氧化物，其中由下式表示的氧化度范围为约30％至80％; 其中y是Co的量，加上存在的二价金属，以磁性Fe氧化物中的原子％计，R是二价Fe离子与总Fe离子的比例; 以及含有Co和任选的二价金属，氧化度为约30〜80％的磁性Fe氧化物的制造方法，其包括脱水和还原含有Co的目标物和任选的二价金属，得到磁性 含有Co和任选的二价金属，并在低于约100℃的较低温度下逐渐氧化磁铁矿。
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公开(公告)号：US4002804A
公开(公告)日：1977-01-11
申请号：US600689
申请日：1975-07-31
CPC分类号： G11B5/714 , G11B5/706 , G11B5/70694 , Y10S428/90 , Y10T428/24975
摘要： A magnetic recording material which comprises a support having thereon a magnetic recording layer comprising a ferromagnetic substance and a binder, wherein the ferromagnetic substance comprises a mixture of (1) a Berthollide iron oxide having a particle size of about 0.5 .mu. or larger and a degree of oxidation represented by the value of x in FeO.sub.x of 1.33
摘要翻译： 一种磁记录材料，包括其上具有包含铁磁性物质和粘合剂的磁记录层的载体，其中所述铁磁性物质包含（1）粒径为约0.5μm或更大的Berthollide氧化铁和 的FeOx中的x值为1.33
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