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1.发明授权Preparation of finely divided and acicular hexagonal ferrites and their use for the production of magnetic recording media and plastoferrites 失效精细和针状的六方晶系铁氧体的制备及其用于生产磁记录介质和塑性铁素体的用途
公开(公告)号：US4764300A
公开(公告)日：1988-08-16
申请号：US865121
申请日：1986-05-20
申请人： Hartmut Hibst , Peter Rudolf , Helmut Jakusch
发明人： Hartmut Hibst , Peter Rudolf , Helmut Jakusch
CPC分类号： H01F1/113 , C01G49/0036 , C01G49/0063 , C01G49/009 , C01G51/006 , G11B5/70678 , C01P2002/54 , C01P2004/10 , C01P2004/54 , C01P2006/12 , C01P2006/42 , C01P2006/60
摘要： A process for the preparation of finely divided and acicular hexagonal ferrites of the general formula AMe.sub.x Fe.sub.12-x O.sub.19, where x is .ltoreq.4, A is barium and/or strontium and Me is indium or equimolar amounts of zinc or cobalt and titanium, and their use for the production of magnetic recording media and plastoferrites.
摘要翻译： 制备通式为AMexFe12-xO19的细碎和针状六方晶系铁氧体的方法，其中x为4，A为钡和/或锶，Me为铟或等摩尔量的锌或钴和钛，以及 它们用于生产磁记录介质和plastoferrites。
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2.发明授权Preparation of acicular ferromagnetic metal particles consisting essentially of iron 失效制备基本上由铁组成的针状铁磁性金属颗粒
公开(公告)号：US4439231A
公开(公告)日：1984-03-27
申请号：US518000
申请日：1983-07-28
申请人： Werner Steck , Peter Rudolf , Wilhelm Sarnecki , Werner Loeser , Jenoe Kovacs , Helmut Jakusch
发明人： Werner Steck , Peter Rudolf , Wilhelm Sarnecki , Werner Loeser , Jenoe Kovacs , Helmut Jakusch
摘要： Acicular ferromagnetic metal particles consisting essentially of iron are prepared by a process wherein acicular iron(III) oxide hydroxide provided with a shape-stabilizing surface coating, or iron(III) oxide obtained therefrom by dehydration, is reduced by means of a decomposable organic compound and hydrogen.
摘要翻译： 基本上由铁组成的针状铁磁金属颗粒是通过一种方法制备的，其中通过脱水从其中获得的具有形状稳定表面涂层或氧化铁（III）的氧化铬针状氧化物（III）通过可分解的有机化合物 和氢气。
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3.发明授权Stabilization of pyrophoric ferromagnetic acicular metal particles consisting essentially of iron 失效基本上由铁组成的自发性铁磁针状金属颗粒的稳定化
公开(公告)号：US4420330A
公开(公告)日：1983-12-13
申请号：US368984
申请日：1982-04-16
申请人： Helmut Jakusch , Werner Loeser , Eberhard Koester , Peter Rudolf , Werner Senkpiel , Werner Steck
发明人： Helmut Jakusch , Werner Loeser , Eberhard Koester , Peter Rudolf , Werner Senkpiel , Werner Steck
CPC分类号： C23C8/14 , B22F1/0088 , H01F1/061
摘要： A process for stabilizing pyrophoric acicular metal particles consisting essentially of iron, by reaction with oxygen-containing gases in two stages, wherein, in the first stage, up to 1/3 of the passivating layer present in the final state is formed at from 25.degree. to 45.degree. C. and, in a subsequent second stage, the remainder of the passivating layer is formed at from 50.degree. to 70.degree. C.
摘要翻译： 一种通过两个阶段与含氧气体反应来稳定基本由铁组成的自发性针状金属颗粒的方法，其中在第一阶段中，以最终状态存在至多1/3的钝化层形成为25 ℃至45℃，在随后的第二阶段中，钝化层的其余部分在50℃至70℃下形成。
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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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6.发明授权Preparation of acicular ferromagnetic metal particles consisting essentially of iron 失效制备基本上由铁组成的针状铁磁性金属颗粒
公开(公告)号：US4729785A
公开(公告)日：1988-03-08
申请号：US856972
申请日：1986-04-29
申请人： Ekkehard Schwab , Werner Steck , Peter Rudolf , Guenter Vaeth , Helmut Jakusch , Jenoe Kovacs
发明人： Ekkehard Schwab , Werner Steck , Peter Rudolf , Guenter Vaeth , Helmut Jakusch , Jenoe Kovacs
CPC分类号： G11B5/70615
摘要： Acicular metal particles consisting essentially of iron are prepared by reducing .alpha.-iron(III) oxide obtained--by dehydration--from acicular iron(III) oxide hydroxide prepared in the presence of phosphate ions and having a shape-stabilizing surface coating.
摘要翻译： 基本上由铁组成的针状金属颗粒通过还原由磷酸根离子制备的具有形状稳定表面涂层的针状氧化铁（III）氧化物氢氧化物脱水获得的α-铁（III）氧化物来制备。
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7.发明授权Preparation of finely divided acicular hexagonal ferrites having a high coercive force 失效制备具有高矫顽力的细分针状六方晶系铁氧体
公开(公告)号：US4675170A
公开(公告)日：1987-06-23
申请号：US732309
申请日：1985-05-09
申请人： Hartmut Hibst , Peter Rudolf , Graham E. McKee
发明人： Hartmut Hibst , Peter Rudolf , Graham E. McKee
CPC分类号： C01G49/0036 , G11B5/70678 , H01F1/11 , C01P2002/76 , C01P2004/10 , C01P2004/60 , C01P2006/12 , C01P2006/42
摘要： A process for the preparation of finely divided acicular hexagonal ferrites which have a high coercive force and are of the general formula MFe.sub.12 O.sub.19, where M is barium or strontium, and their use for the production of magnetic recording media and plastoferrites.
摘要翻译： 制备具有高矫顽力并具有通式MFe12O19（其中M为钡或锶）的精细分散的针状六方晶系铁氧体的方法及其用于制备磁记录介质和高铁灰岩的方法。
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公开(公告)号：US4497723A
公开(公告)日：1985-02-05
申请号：US508168
申请日：1983-06-27
申请人： Manfred Ohlinger , Guenter Vaeth , Peter Rudolf , Wilhelm Sarnecki , Helmut Jakusch , Eberhard Koester , Milena Melzer
发明人： Manfred Ohlinger , Guenter Vaeth , Peter Rudolf , Wilhelm Sarnecki , Helmut Jakusch , Eberhard Koester , Milena Melzer
CPC分类号： B82Y30/00 , C01G49/06 , G11B5/70694 , C01P2002/60 , C01P2004/10 , C01P2004/64 , C01P2006/12 , C01P2006/42
摘要： A process for the preparation of acicular ferrimagnetic iron oxides by reducing gamma-iron(III) oxide hydroxide to magnetite, at from 280.degree. to 620.degree. C., by means of an organic compound which is decomposable at this temperature in the presence of iron oxide, and, optionally, a stream of reducing gas, and, if desired, then oxidizing the magnetite with oxygen-containing gases, at from 150.degree. to 450.degree. C., to acicular ferrimagnetic iron oxide of the formula FeO.sub.x, where x is from above 1.33 to 1.50, wherein the organic compound used for the reduction is a non-polar glycerol ester of a fatty acid which is introduced into the aqueous reaction suspension during the preparation of the gamma-iron(III) oxide hydroxide.
摘要翻译： 一种制备针状亚铁磁性氧化铁的方法，该方法是通过在这种温度下在铁存在下可分解的有机化合物将280℃至620℃的氧化氢氧化物还原成磁铁矿 氧化物和任选的还原气体流，并且如果需要，然后用含氧气体在150℃至450℃下将磁铁矿氧化成式FeO x的针状亚铁磁性氧化铁，其中x为 从1.33到1.50，其中用于还原的有机化合物是在制备γ-铁（III）氧化物氢氧化物期间引入到水性反应悬浮液中的非极性甘油酯脂肪酸酯。
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公开(公告)号：US4221776A
公开(公告)日：1980-09-09
申请号：US6528
申请日：1979-01-25
申请人： Horst Autzen , Helmut Jakusch , Eberhard Koester , Werner Loeser , Peter Rudolf , Wilhelm Sarnecki , Werner Steck
发明人： Horst Autzen , Helmut Jakusch , Eberhard Koester , Werner Loeser , Peter Rudolf , Wilhelm Sarnecki , Werner Steck
CPC分类号： C01G49/06 , G11B5/70642 , G11B5/70647 , G11B5/70652 , G11B5/70684 , G11B5/70694 , C01P2004/10 , C01P2006/12 , C01P2006/42
摘要： A process for the manufacture of acicular ferrimagnetic iron oxide by reducing heat-treated acicular iron(III) oxide hydroxide with an organic compound which decomposes in the presence of iron oxide at from 450.degree. to 650.degree. C., followed by at least partial oxidation with an oxygen-containing gas at from 200.degree. to 500.degree. C., wherein the iron(III) oxide hydroxide employed is heat-treated at from 450.degree. to 700.degree. C. and has a surface area, measured by the BET method, of from 10 to 23 m.sup.2 /g.
摘要翻译： 一种通过用450℃至650℃在氧化铁存在下分解有机化合物的热处理的针状铁（III）氢氧化物还原热处理的针状铁磁性氧化铁的方法，然后至少部分氧化 与含氧气体在200-500℃下反应，其中使用的氧化铁（III）氢氧化物在450-700℃下进行热处理，并且通过BET法测量的表面积， 为10至23m2 / g。
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公开(公告)号：US4296149A
公开(公告)日：1981-10-20
申请号：US116552
申请日：1980-01-29
申请人： Peter Rudolf , Werner Steck , Helmut Jakusch , Guenter Vaeth , Christof Jaeckh
发明人： Peter Rudolf , Werner Steck , Helmut Jakusch , Guenter Vaeth , Christof Jaeckh
CPC分类号： G11B5/70657
摘要： A process for the manufacture of acicular magnetic iron oxide consisting of a 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 percent by weight of cobalt(II) ions and from 0.1 to 15 percent by weight of iron(II) ions, wherein a solution containing cobalt(II) hydroxide and iron(II) hydroxide is applied to acicular gamma-iron(III) oxide particles and the latter are heated at 100.degree.-220.degree. C.
摘要翻译： 制造由氧化铁（III）和核铁素体壳构成的针状磁性氧化铁的方法，该磁铁氧化铁基于磁性材料的总量含有0.2至12重量％的钴（II） 离子和0.1至15重量％的铁（II）离子，其中将含有氢氧化钴（II）和氢氧化铁（II）的溶液施加到针状γ-铁（III）氧化物颗粒上，并将其加热至100℃ DEG -220℃
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