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    • 10. 发明授权
    • Improving the magnetic properties of gamma-iron (III) oxide
    • 提高γ-铁(III)氧化物的磁性能
    • US4212903A
    • 1980-07-15
    • US770989
    • 1977-02-22
    • Georg SchnellFritz HammonManfred Ohlinger
    • Georg SchnellFritz HammonManfred Ohlinger
    • G11B5/706H01F10/00B05D5/12
    • G11B5/70647G11B5/70652G11B5/70657Y10S428/90
    • The invention relates to a process for improving the magnetic properties, especially the remanent magnetization, of gamma-iron(III) oxide which can be used advantageously as the magnetic component in magnetic recording media exhibiting reduced print-through. For this purpose, a gamma-iron(III) oxide manufactured according to known processes is heated at temperatures of from 400.degree. to 700.degree. C., the magnetic pigment having basic compounds on the crystal surface during this heat treatment and retaining a pH value above 8 until heating is over. Gamma-iron(III) oxide magnetic pigments treated in this way are particularly suitable for the manufacture of low-noise magnetic recording media with high remanent magnetization and particularly low print-through.
    • 本发明涉及一种用于改善氧化铁(III)的磁性能,特别是剩余磁化的方法,该方法可以有利地用作磁记录介质中的磁性组分,这些磁性组分表现出减少的打印通量。 为此,根据已知方法制造的γ-铁(III)氧化物在400℃至700℃的温度下加热,该磁性颜料在该热处理期间在晶体表面上具有碱性化合物,并保持pH值 高于8,直到加热结束。 以这种方式处理的氧化镍(III)磁性颜料特别适用于制造具有高剩余磁化强度和特别是低打印通量的低噪声磁记录介质。