Metal treatment – Stock – Magnetic
Patent
1997-04-25
2000-04-11
Sheehan, John
Metal treatment
Stock
Magnetic
148301, 420 80, 420 83, 420103, 252 6256, H01F 1047
Patent
active
060484128
ABSTRACT:
The present invention relates to spindle-shaped goethite particles and spindle-shaped hematite particles, which have a narrow particle size distribution, include no dendrites, and have an appropriate particle shape and a large aspect ratio (major axial diameter/minor axial diameter); and spindle-shaped magnetic iron based alloy particles which are obtained from the spindle-shaped goethite particle or spindle-shaped hematite particles as a beginning material and which have a high coercive force and an excellent coercive force distribution. Such spindle-shaped goethite particles comprises: goethite seed containing 0.5 to 25 atm % of Co based on the total Fe in the spindle-shaped goethite particles, and goethite surface layer containing 0.5 to 15 atm % of Al based on the total Fe in the spindle-shaped goethite particles; and having an average major axial diameter of 0.05 to 1.0 .mu.m.
REFERENCES:
patent: 5156922 (1992-10-01), Mishima et al.
patent: 5399278 (1995-03-01), Yamashita et al.
patent: 5466306 (1995-11-01), Mishima et al.
patent: 5580399 (1996-12-01), Tamai et al.
patent: 5591535 (1997-01-01), Hisano et al.
patent: 5645652 (1997-07-01), Okinaka et al.
Kurokawa Haruki
Mori Kohji
Sheehan John
Toda Kogyo Corporation
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