公开(公告)号：US20050150574A1

公开(公告)日：2005-07-14

申请号：US11002669

申请日：2004-12-03

申请人： Kazuyuki Matsumoto ,  Kimitaka Sato ,  Takatoshi Fujino ,  Kenichi Inoue

发明人： Kazuyuki Matsumoto ,  Kimitaka Sato ,  Takatoshi Fujino ,  Kenichi Inoue

IPC分类号： G11B5/706 ,  G11B5/712 ,  G11B5/842 ,  H01F1/20

CPC分类号： G11B5/70621 ,  G11B5/70615 ,  Y10S428/90 ,  Y10T428/2991

摘要： A ferromagnetic iron alloy powder for a magnetic recording medium is composed of acicular iron-base particles of an average major axis length (X) of not less than 20 nm and not greater than 80 nm and have oxygen content of not less than 15 wt % and coercive force (Hc) of not less than [0.0036 X3−1.1 X2+110 X−1390 (Oe)] (where X is average major axis length expressed in nm). The ferromagnetic iron alloy powder is obtained by reacting metal powder composed of acicular iron-base particles having an average major axis length of not less than 20 nm and not greater than 80 nm with pure water in substantial absence of oxygen to form a metal oxide film on the particle surfaces. Optionally, the particles can be reacted with a weak oxidizing gas by a wet or dry method.

摘要翻译： 用于磁记录介质的铁磁性铁合金粉末由平均长轴长（X）不小于20nm且不大于80nm的针状铁基颗粒组成，氧含量不小于15重量％ 和矫顽力（Hc）不小于[0.0036×3 -1.1×2 +1×10 -1390（Oe）]（其中X是表示的平均长轴长度 nm）。 通过使基本上不含氧的平均长轴长度不小于20nm且不大于80nm的针状铁基颗粒组成的金属粉末与纯水反应形成金属氧化物膜而获得铁磁性铁合金粉末 在颗粒表面。 任选地，颗粒可以通过湿法或干法与弱氧化气体反应。

公开(公告)号：US06841271B2

公开(公告)日：2005-01-11

申请号：US10378861

申请日：2003-03-05

申请人： Kazuyuki Matsumoto ,  Kimitaka Sato ,  Takatoshi Fujino ,  Kenichi Inoue

发明人： Kazuyuki Matsumoto ,  Kimitaka Sato ,  Takatoshi Fujino ,  Kenichi Inoue

IPC分类号： G11B5/706 ,  G11B5/712 ,  G11B5/842 ,  G11B5/66

CPC分类号： G11B5/70621 ,  G11B5/70615 ,  Y10S428/90 ,  Y10T428/2991

摘要： A ferromagnetic iron alloy powder for a magnetic recording medium is composed of acicular iron-base particles of an average major axis length (X) of not less than 20 nm and not greater than 80 nm and have oxygen content of not less than 15 wt % and coercive force (Hc) of not less than [0.0036 X3−1.1 X2+110 X−1390 (Oe)] (where X is average major axis length expressed in nm). The ferromagnetic iron alloy powder is obtained by reacting metal powder composed of acicular iron-base particles having an average major axis length of not less than 20 nm and not greater than 80 nm with pure water in substantial absence of oxygen to form a metal oxide film on the particle surfaces. Optionally, the particles can be reacted with a weak oxidizing gas by a wet or dry method.

摘要翻译： 用于磁记录介质的铁磁性铁合金粉末由平均长轴长（X）不小于20nm且不大于80nm的针状铁基颗粒组成，氧含量不小于15重量％ 矫顽力（Hc）不小于[0.0036×3 -1.1×2 + 1×10 -1390（Oe）]（其中X为以nm表示的平均长轴长度）。 通过使基本上不含氧的平均长轴长度不小于20nm且不大于80nm的针状铁基颗粒组成的金属粉末与纯水反应形成金属氧化物膜而获得铁磁性铁合金粉末 在颗粒表面。 任选地，颗粒可以通过湿法或干法与弱氧化气体反应。