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1.发明授权Acicular, ferromagnetic metal particles essentially consisting of iron, and their preparation 失效针状，铁磁金属颗粒基本上由铁组成，其制备方法
公开(公告)号：US4960462A
公开(公告)日：1990-10-02
申请号：US284246
申请日：1988-12-14
申请人： Michael W. Mueller , Kalus-Dieter Hoppe , Ekkehard Schwab , Werner Steck , Helmut Auweter , Rainer Feser
发明人： Michael W. Mueller , Kalus-Dieter Hoppe , Ekkehard Schwab , Werner Steck , Helmut Auweter , Rainer Feser
CPC分类号： G11B5/70615 , B22F9/22
摘要： Acicular, ferromagnetic metal particles which essentially consist of iron and have a nickel content of not more than 0.4% by weight and high values for coercive force and magnetization, and a process for the preparation of these particles. The particles further include zinc, phosphorus in the form of phosphate ions, and silicon in the form of SiO.sub.2.
摘要翻译： 针状，铁质金属颗粒，其主要由铁组成且镍含量不超过0.4重量％，矫顽力和磁化强度高，以及制备这些颗粒的方法。 颗粒还包括呈磷酸根离子形式的锌，磷和SiO 2形式的硅。
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2.发明授权Chromium dioxide material, its preparation and magnetic recording media containing this chromium dioxide material 失效二氧化铬材料，其制备和含有这种二氧化铬材料的磁记录介质
公开(公告)号：US5096779A
公开(公告)日：1992-03-17
申请号：US397290
申请日：1989-08-23
申请人： Michael W. Mueller , Ekkehard Schwab , Helmut Auweter , Rainer Feser , Werner Huebner , Norbert Mueller , Manfred Ohlinger , Hermann Dikow
发明人： Michael W. Mueller , Ekkehard Schwab , Helmut Auweter , Rainer Feser , Werner Huebner , Norbert Mueller , Manfred Ohlinger , Hermann Dikow
IPC分类号： C01G37/027 , C09D5/23 , C09D7/12 , G11B5/706 , H01F1/11
CPC分类号： G11B5/70636 , Y10S428/90 , Y10T428/2991
摘要： A chromium dioxide material consisting of acicular, ferromagnetic chromium dioxide particles having a nonmagnetic, hydrogen-containing protective surface layer, which material has improved stability to chemical decomposition, a process for its preparation and magnetic recording media containing this chromium dioxide and having good long-term stability of the residual magnetization under conditions of high humidity and temperature are described.
摘要翻译： 由具有非磁性，含氢保护表面层的针状铁磁性二氧化铬颗粒组成的二氧化铬材料，该材料具有改善的化学分解稳定性，其制备方法和含有该二氧化铬的磁记录介质， 描述了在高湿度和高温条件下剩余磁化的长期稳定性。
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3.发明授权Process for preparing acicular ferromagnetic material consisting essentially of iron-containing chromium dioxide 失效制备基本上由含铁二氧化铬组成的针状铁磁材料的方法
公开(公告)号：US5030371A
公开(公告)日：1991-07-09
申请号：US429772
申请日：1989-10-31
申请人： Michael W. Mueller , Ekkehard Schwab , Helmut Auweter , Rainer Feser , Rudi Lehnert , Norbert Mueller , Manfred Ohlinger
发明人： Michael W. Mueller , Ekkehard Schwab , Helmut Auweter , Rainer Feser , Rudi Lehnert , Norbert Mueller , Manfred Ohlinger
CPC分类号： G11B5/70636
摘要： An acicular, ferromagnetic material which has a high coercive force and essentially consists of iron-containing chromium dioxide is prepared by thermal decomposition of hydrated chromium(III) chromate under superatmospheric pressure.
摘要翻译： 通过在超大气压下热分解水合铬酸（III）铬，制备具有高矫顽力并且基本上由含铁二氧化铬组成的针状铁磁材料。
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4.发明授权
公开(公告)号：US5064549A
公开(公告)日：1991-11-12
申请号：US615861
申请日：1990-11-20
申请人： Michael W. Mueller , Ekkehard Schwab , Helmut Auweter , Rainer Feser , Bernhard Boettcher , Norbert Mueller , Wolfgang Kochanek
发明人： Michael W. Mueller , Ekkehard Schwab , Helmut Auweter , Rainer Feser , Bernhard Boettcher , Norbert Mueller , Wolfgang Kochanek
IPC分类号： C01G37/027 , C30B29/62 , G11B5/706
CPC分类号： G11B5/70636 , C01G37/027 , C01P2004/10 , C01P2006/12 , C01P2006/40 , C01P2006/42 , C01P2006/80
摘要： Stabilized acicular ferromagnetic chromium dioxide is prepared by reductive treatment of the chromium dioxide with Na.sub.2 [Fe(CO).sub.4 ], and this material is present in magnetic recording media.
摘要翻译： 通过用Na 2 [Fe（CO）4]还原处理二氧化铬制备稳定的针状铁磁性二氧化铬，并且该材料存在于磁记录介质中。
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公开(公告)号：US4913890A
公开(公告)日：1990-04-03
申请号：US315049
申请日：1989-02-24
申请人： Volker Arndt , Helmut Auweter , Rainer Feser , Ekkehard Schwab
发明人： Volker Arndt , Helmut Auweter , Rainer Feser , Ekkehard Schwab
CPC分类号： G11B5/70663 , C01G49/06 , C01P2002/54 , C01P2004/10 , C01P2006/12
摘要： Finely divided acicular and pore-free .alpha.-Fe.sub.2 O.sub.3 is prepared from an iron(III) salt in the presence of one or more organic substances which form complexes with iron(III) ions, in alkaline supension at from 80.degree. to 250.degree. C., and is used for the preparation of magnetic materials suitable for magnetic recording media.
摘要翻译： 在一种或多种与铁（III）离子形成络合物的有机物质的存在下，在80至250℃的碱性载体中，由铁（III）盐制备精细分散的针状和无孔α-Fe 2 O 3。 ，并用于制备适用于磁记录介质的磁性材料。
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公开(公告)号：US4770903A
公开(公告)日：1988-09-13
申请号：US45552
申请日：1987-05-04
CPC分类号： G11B5/712 , G11B5/70657
摘要： Acicular, magnetic iron oxide consisting of a core of gamma-iron(III) oxide and a ferrite shell containing a total of from 0.4 to 12% by weight of cobalt(II) ions and from 0.1 to 15% by weight of iron(II) ions, the percentages being based on the total amount of magnetic material, is prepared by a process in which an iron(II) hydroxide precipitate is applied to the gamma-iron(III) oxide core in a first stage and an iron-(II)/cobalt hydroxide precipitate is applied to the said core in a second stage, and the core is then converted to the ferrite shell by oxidation.
摘要翻译： 针状磁性氧化铁由氧化铁（III）的核心和总共含有0.4〜12重量％的钴（II）离子和0.1〜15重量％的铁（II）的铁氧体壳组成 ）离子，其百分比基于磁性材料的总量，通过其中将氢氧化铁（II）沉淀物施加到第一阶段中的γ-铁（III）氧化物核和铁 - （ II）/氢氧化钴沉淀物在第二阶段施加到所述芯上，然后通过氧化将芯转变成铁氧体壳。
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公开(公告)号：US5009877A
公开(公告)日：1991-04-23
申请号：US481777
申请日：1990-02-20
申请人： Werner Steck , Laszlo Marosi , Herbert Haberkorn , Rainer Feser , Werner Huebner , Helmut Jakusch
发明人： Werner Steck , Laszlo Marosi , Herbert Haberkorn , Rainer Feser , Werner Huebner , Helmut Jakusch
IPC分类号： H01F1/11 , C01G37/027 , G11B5/706
CPC分类号： G11B5/70636
摘要： Acicular ferromagnetic chromium dioxide is stabilized by treatment with an alkali metal hydroxide in an aqueous alkaline suspension at elevated temperatures.
摘要翻译： 针状铁磁性二氧化铬通过在碱性水溶液中在高温下用碱金属氢氧化物处理来稳定化。
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公开(公告)号：US4826671A
公开(公告)日：1989-05-02
申请号：US024564
申请日：1987-03-11
申请人： Volker Arndt , Rainer Feser , Werner Steck , Helmut Jakusch
发明人： Volker Arndt , Rainer Feser , Werner Steck , Helmut Jakusch
CPC分类号： G11B5/70663 , C01G49/06 , C01P2002/54 , C01P2004/10 , C01P2004/54 , C01P2004/62 , C01P2004/84 , C01P2006/42
摘要： Finely divided, acicular and pore-free .alpha.-Fe.sub.2 O.sub.3 is prepared from iron(III) salts in the presence of one or more organic substances which form complexes with iron(III) ions, in alkaline suspension, at from 80.degree. to 250.degree. C.
摘要翻译： 在一种或多种有机物质的存在下，在碱性悬浮液中，在80-250℃下，由铁（III）盐制备细小的针状和无孔的α-Fe 2 O 3，所述有机物与铁（III）离子形成络合物 。
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公开(公告)号：US4755395A
公开(公告)日：1988-07-05
申请号：US859902
申请日：1986-05-05
申请人： Werner Steck , Rainer Feser , Werner Loeser , Peter Rudolf , Guenter Vaeth , Helmut Jakusch , Jenoe Kovacs
发明人： Werner Steck , Rainer Feser , Werner Loeser , Peter Rudolf , Guenter Vaeth , Helmut Jakusch , Jenoe Kovacs
CPC分类号： G11B5/70673
摘要： The preparation of acicular ferrimagnetic iron oxides which contain cobalt and phosphate ions and, if desired, further additives, and their use for manufacturing magnetic recording media.
摘要翻译： 制备含有钴和磷酸根离子的针状亚铁磁性氧化物，如果需要，还可制备其它添加剂及其制造磁记录介质的用途。
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公开(公告)号：US4755315A
公开(公告)日：1988-07-05
申请号：US14172
申请日：1987-02-12
申请人： Werner Steck , Rainer Feser , Helmut Jakusch , Peter Rudolf , Guenter Vaeth , Udo Kullmann
发明人： Werner Steck , Rainer Feser , Helmut Jakusch , Peter Rudolf , Guenter Vaeth , Udo Kullmann
CPC分类号： G11B5/70673
摘要： A process for the preparation of cobalt-containing isotropic magnetic iron oxides which are based on gamma-iron(III) oxide, contain from 2 to 7% by weight of cobalt(II) ions and less than 2% by weight of Fe(II) ions, the percentages in each case being based on the iron oxide, and have a particle length of from 0.08 to 0.30 .mu.m, a length/width ratio of from 1.5 to 3.5:1 and a specific remanent magnetization after saturation of not less than 60 nTm.sup.3 /g.
摘要翻译： 制备基于γ-氧化铁（III）的含钴各向同性磁性氧化铁的方法含有2至7重量％的钴（II）离子和小于2重量％的Fe（II ）离子，每种情况下的百分比基于氧化铁，并且具有0.08至0.30μm的长度，1.5至3.5:1的长宽比和饱和后的特定剩余磁化强度不小于 超过60 nTm3 / g。
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