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    Composite material for magnetooptic recording its preparation and its use
    2.
    发明授权
    Composite material for magnetooptic recording its preparation and its use 失效
    复合材料用于磁光记录其制备及其用途

    公开(公告)号：US6017645A

    公开(公告)日：2000-01-25

    申请号：US030283

    申请日：1998-02-25

    申请人： Philippe Tailhades ,  Jean-Pierre Bonino ,  Isabelle Pasquet ,  Lionel Presmanes ,  Laurence Bouet ,  Abel Rousset ,  Patrick Langlade

    发明人： Philippe Tailhades ,  Jean-Pierre Bonino ,  Isabelle Pasquet ,  Lionel Presmanes ,  Laurence Bouet ,  Abel Rousset ,  Patrick Langlade

    IPC分类号： G11B11/105 ,  G11B5/66

    CPC分类号： G11B11/10586 ,  Y10S428/90

    摘要： Composite material for magnetooptic recording, comprising a thin layer deposited on a non-magnetic solid substrate. The said thin layer is a polycrystalline layer consisting of microcrystals having a structure of a vacant-site spinel ferrite, based on iron, cobalt and transition metals. By virtue of a particular process for producing the thin layers, enabling especially the size of the crystallites to be increased, it is possible to optimize the magnetic and magnetooptic properties and to obtain thin layers having, for example, a remanent Faraday rotation and a coercive field which are greater, respectively, than 1 degree per micron for the Faraday rotation and 1000 Oe for the coercive field.

    摘要翻译： 用于磁光记录的复合材料，包括沉积在非磁性固体基底上的薄层。 所述薄层是由具有基于铁，钴和过渡金属的空位尖晶石铁氧体的结构的微晶构成的多晶层。 通过制造薄层的特定方法，特别能够提高微晶的尺寸，可以优化磁性和磁光性质，并获得具有例如残留的法拉第旋转和矫顽力的薄层 场分别对于法拉第旋转分别大于1微米/微米，对于矫顽场分别为1000奥斯特。

    Solid solutions of magnetic oxides and method of preparation
    5.
    发明授权
    Solid solutions of magnetic oxides and method of preparation 失效
    磁性氧化物的固体溶液及其制备方法

    公开(公告)号：US4096080A

    公开(公告)日：1978-06-20

    申请号：US622573

    申请日：1975-10-15

    申请人： Paul Mollard ,  Jacques Paris ,  Abel Rousset

    发明人： Paul Mollard ,  Jacques Paris ,  Abel Rousset

    IPC分类号： C04B35/26

    CPC分类号： C04B35/265 ,  C04B35/2625 ,  C04B35/2658 ,  C04B35/2666 ,  C04B35/2683

    摘要： The invention concerns solid solutions of oxides of iron and of a divalent metal other than cobalt Co.sup.2+ or, alternatively, of iron and of more than one divalent metal, including cobalt. Besides Co, the divalent metals may be Ni, Cu, Mn, Zn, Mg and Cd. Such solutions are prepared by precipitating a mixed oxalate containing iron and the other divalent metal or metals desired. This mixed oxalate is decomposed by heating it in open air at a progressively increasing temperature until carbon is eliminated but without forming rhomboedric oxide .alpha.-Fe.sub.2 O.sub.3. The pyrolyzed product is treated by hydrogen and steam at an elevated temperature to obtain a substituted magnetite, and this magnetite is oxidized in air at such a temperature as to avoid formation of .alpha.-Fe.sub.2 O.sub.3.

    摘要翻译： 本发明涉及铁的氧化物和钴Co 2+以外的二价金属，或者铁和多于一种二价金属（包括钴）的固溶体。 除Co之外，二价金属可以是Ni，Cu，Mn，Zn，Mg和Cd。 通过沉淀含铁的混合草酸盐和所需的其它二价金属或金属来制备这些溶液。 这种混合的草酸盐在逐渐增加的温度下在露天加热直到碳被除去但不形成氧化锆的α-Fe 2 O 3来分解。 热解产物在高温下用氢气和蒸汽处理以获得取代的磁铁矿，并且该磁铁矿在空气中被氧化以避免形成α-Fe 2 O 3。

    Method of preparing metal powders, metal powders prepared in this way and compacts that include these powders
    7.
    发明授权
    Method of preparing metal powders, metal powders prepared in this way and compacts that include these powders 有权
    制备金属粉末的方法，以这种方式制备的金属粉末和包括这些粉末的压块

    公开(公告)号：US06464750B1

    公开(公告)日：2002-10-15

    申请号：US09592440

    申请日：2000-06-12

    申请人： Philippe Tailhades ,  Valérie Carles ,  Abel Rousset

    发明人： Philippe Tailhades ,  Valérie Carles ,  Abel Rousset

    IPC分类号： C22C104

    CPC分类号： B82Y25/00 ,  B22F1/004 ,  B22F9/22 ,  C06B33/00 ,  C22B5/12 ,  C22B23/00 ,  C22B59/00 ,  H01F1/065 ,  H01F1/20 ,  H01M4/803 ,  H01M6/36

    摘要： The invention relates to a method of preparing metal powder comprising: preparing a simple or mixed oxalate of one or more metals formed of particles with needle-like morphology having a mean acicularity ratio (length/diameter) of from 4 to 20, and a length of from 5 to 10 microns and converting said oxalate to metal or metal alloy powder by reducing treatment with gaseous hydrogen. The conversion of said oxalate can be carried out by decomposing said oxalate, in air, to an oxide and then reducing said oxide to metal or metal alloy. The metal is chosen from among the rare earth metals and the transition metals, preferably from among iron, cobalt, and nickel. The method is particularly suitable for making iron powder metal having a spongy and filament-like microstructure which makes it suitable for use in heating composition for thermo-piles. In addition, the invention relates to metal compacts unstoved or annealed which are obtained by applying compaction pressure to the powders according to the invention.

    摘要翻译： 本发明涉及一种制备金属粉末的方法，包括：制备一种或多种由具有4至20的平均针刺比（长/直径）的针状形态的颗粒形成的一种或多种金属的简单或混合草酸盐， 为5至10微米，并通过减少用气态氢处理将所述草酸盐转化为金属或金属合金粉末。 所述草酸盐的转化可以通过将所述草酸盐在空气中分解成氧化物，然后将所述氧化物还原成金属或金属合金来进行。 金属选自稀土金属和过渡金属，优选从铁，钴和镍中选出。 该方法特别适用于制造具有海绵状和丝状微细结构的铁粉金属，使其适用于热桩用加热组合物。 此外，本发明涉及通过对根据本发明的粉末施加压实压力而获得的未加工或退火的金属压块。

    Method for the preparation of acicular particles containing iron and other divalent metals
    9.
    发明授权
    Method for the preparation of acicular particles containing iron and other divalent metals 失效
    制备含铁和其他二价金属的针状颗粒的方法

    公开(公告)号：US3994819A

    公开(公告)日：1976-11-30

    申请号：US610720

    申请日：1975-09-05

    申请人： Paul Mollard ,  Jacques Paris ,  Abel Rousset

    发明人： Paul Mollard ,  Jacques Paris ,  Abel Rousset

    IPC分类号： C01G49/06 ,  G11B5/706 ,  C04B35/26

    CPC分类号： G11B5/70642 ,  C01G49/06 ,  C01P2002/52 ,  C01P2004/03 ,  C01P2004/10 ,  C01P2004/61 ,  C01P2004/62

    摘要： The invention concerns the preparation of acicular particles of mixed oxalates of iron and of one or more metals of the group consisting of cobalt, nickel, copper, manganese, zinc, magnesium and cadmium. The method consists in preparing a first solution containing cations of iron and of the divalent metal or metals, and a second solution containing oxalic acid, one of the said solutions further containing Cl.sup.- and SO.sub.4.sup.2.sup.- anions and at least the second solution containing alcohol with preferably a light hydrocarbon. The first solution is poured very slowly (1 drop every 10 seconds) into the second one, conveniently at temperature below 0.degree. C, while the latter is strongly stirred. The concentration in alcohol is preferably maintained at at least 50% in the second solution during the whole pouring process which should be effected with at least a slight excess of oxalic acid. The particles obtained may be treated for the preparation of solid solutions of oxides of iron and of the divalent metal or metals for the manufacture of magnetic tapes and the like.

    摘要翻译： 本发明涉及制备铁和由钴，镍，铜，锰，锌，镁和镉组成的组中的一种或多种金属的混合草酸铁的针状颗粒。 该方法包括制备含有铁阳离子和二价金属或金属的第一溶液和含有草酸的第二溶液，所述溶液中的一种还含有Cl - 和SO42-阴离子，并且至少第二溶液 含有优选轻质烃的醇的溶液。 将第一溶液非常缓慢地（在每10秒滴1次）倒入第二溶液中，方便地在低于0℃的温度下，同时将其强烈搅拌。 在整个浇注过程中，醇中的浓度优选在第二溶液中保持至少50％，这应该至少少量过量的草酸进行。 所获得的颗粒可以用于制备铁氧化物和二价金属或金属的固溶体以制造磁带等。