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    • 6. 发明申请
    • PREPARATION OF METAL OXIDE POWDERS USING ACTIVATED BALL MILLING
    • 使用活化球磨法制备金属氧化物粉末
    • WO1996010539A1
    • 1996-04-11
    • PCT/AU1995000653
    • 1995-10-04
    • THE AUSTRALIAN NATIONAL UNIVERSITYKACZMAREK, Wieslaw, AlexanderNINHAM, Barry, WilliamWILLIAMS, James, Stanislaus
    • THE AUSTRALIAN NATIONAL UNIVERSITY
    • C01G49/08
    • B82Y25/00C01G49/0036C01G49/08C01P2002/72C01P2002/88C01P2004/03C01P2006/42G11B5/70642G11B5/70678G11B5/70689G11B5/84H01F1/0063H01F1/11
    • Total phase transformation of hematite to magnetite was accomplished at room temperature by wet magnetomechanical activation of hematite. Low energy mechanical activation of the oxide surface is sufficient to effect the transformation. Oxygen bonds on a alpha -Fe2O3 oxide surface are apparently broken during the mechanical activation process and oxygen is released (removed) to the dispersing polar liquid. The oxygen pressure during the process as well as the nature of the dispering liquid have a critical influence on successful and fast phase transformation. Thus, all preparation performed in air, dry conditions or with nonpolar or saturated hydrocarbons (benzene, anthracene) show that the process of hematite reduction is non existent or very slow. Normal air pressure and/or application of hydrocarbons suppress the transformation. The effects of prolonged milling in air and vacuum on BaFe12O19 ionic crystal structure and particle morphology have been analysed. X-ray diffraction, scanning electron microscopy and thermal analysis experiments show, that for vacuum milled material, the ordered structure transforms progressively into a stable disordered nanocrystalline phase. For air milled samples, apart from a structural transformation, chemical decomposition was found. Application of heat treatment restores perfect Ba-ferrite crystal structure with the particle remaining in the submicron size range. With structural changes during annealing, the magnetic properties were altered. Radically different hysteresis behaviour was obtained for powders annealed at 1273 K. The value of volume magnetisation 4 pi Ms = 335.4 - 347.2 kA/m is near the value for premilled ferrite powder (10 % lower), but measured coercivity value Hc = 393.9 - 445.6 kA/m was improved quite remarkably by a factor of 6 due to the fine crystalline grain structure.
    • 赤铁矿到磁铁矿的总相变在室温下通过湿法磁力机械活化赤铁矿完成。 氧化物表面的低能机械活化足以实现转化。 α-Fe 2 O 3氧化物表面上的氧键在机械活化过程中明显破裂,氧分散(除去)到分散极性液体中。 该过程中的氧气压力以及分散液体的性质对成功和快速相变具有关键影响。 因此,在空气,干燥条件下或用非极性或饱和烃(苯,蒽)进行的所有制备显示赤铁矿还原过程不存在或非常缓慢。 正常空气压力和/或碳氢化合物的应用抑制了转化。 已经分析了在空气和真空中延长研磨对BaFe12O19离子晶体结构和颗粒形态的影响。 X射线衍射,扫描电子显微镜和热分析实验表明,对于真空研磨材料,有序结构逐渐转变为稳定的无序纳米晶相。 对于空气研磨的样品,除了结构转化外,还发现化学分解。 热处理的应用恢复了完全的Ba铁氧体晶体结构,其颗粒保持在亚微米尺寸范围内。 随着退火过程中的结构变化,磁性改变了。 对于在1273K退火的粉末,获得了根本不同的滞后特性。体积磁化4 pi Ms = 335.4 - 347.2 kA / m的值接近预制铁素体粉末的值(10%以下),但测得的矫顽力值Hc = 393.9- 由于细晶粒结构,445.6 kA / m相当显着地提高了6倍。
    • 8. 发明专利
    • Manufacture of magnetic recording tape
    • 磁记录带的制造
    • JPS59117736A
    • 1984-07-07
    • JP23190682
    • 1982-12-24
    • Nec Home Electronics Ltd
    • KATSUTA SHINICHI
    • G11B5/64G11B5/66G11B5/706G11B5/84
    • G11B5/70689
    • PURPOSE:To form easily a ferromagnetic gamma-Fe2O3 film by winding a tapelike substrate 5 having a formed thin film of magnetite-base magnetic oxide and a tape member having projections along both sides so that the projections face the magnetic film in a superposed state, and heat treating the wound body in an oxidizing atmosphere. CONSTITUTION:A spool 1 made of an Al alloy or the like and composed of a tube 2 and flanges 3, 3 having many holes 4 at both ends of the tube 2 is prepd. A tapelike substrate 5 having a thin film 6 of magnetite (Fe3O4)-base magnetic oxide formed on the surface and a tape member 7 made of stainless steel or the like and having projections 8 along both sides are wound around the spool 1 so that the projections 8 face the magnetic film 6. A plurality of such spools 1 are heat treated at 250-300 deg.C in a heated oxidizing atmosphere 9 for about 1hr to convert the magnetic films 6 into ferromagnetic gamma-Fe2O3 films. Thus, homogeneous magnetic tapes can be manufactured in large quantities.
    • 目的:通过缠绕具有形成的磁铁矿基磁性氧化物薄膜的带状基板5和具有两侧突出部的带状部件,使凸部以叠置状态面向磁性膜,容易地形成铁磁性γ-Fe 2 O 3膜, 并在氧化气氛中对伤口体进行热处理。 构成:制备由铝合金等制成并且由管2构成的线轴1和在管2的两端具有许多孔4的凸缘3,3。 具有形成在表面上的磁铁矿(Fe3O4) - 基磁性氧化物薄膜6和由不锈钢等制成的带状部件7并具有沿着两侧的突出部8的带状基板5卷绕在线轴1上, 突起8面对磁性膜6.多个这样的线轴1在加热的氧化气氛9中在250-300℃下热处理约1小时,以将磁性膜6转变为铁磁性γ-Fe 2 O 3膜。 因此,可以大量制造均匀的磁带。