Process of making goethite or iron-based alloy particles

Details Process of making goethite or iron-based alloy particles Process of making goethite or iron-based alloy particles

1996-12-31

1999-10-19

Wyszomierski, George

Specialized metallurgical processes, compositions for use therei

Processes

Producing or purifying free metal powder or producing or...

75349, 75350, 423594, 423632, H01F 111, H01F 136

Patent

active

059682264

ABSTRACT:
The disclosure describes spindle-shaped magnetic iron-based alloy particles containing cobalt and iron as the main ingredients in which the Co content is 1.0 to 50.0 atm % (calculated as Co) based on the total Fe in the spindle-shaped magnetic iron-based alloy particles, and which the spindle-shaped magnetic iron-based alloy particles have an average major axis diameter of 0.05 to 0.18 .mu.m, a size distribution (standard deviation/major axis diameter) of not more than 0.25, an average minor axis diameter of 0.010 to 0.020 .mu.m, an aspect ratio (major axis diameter/minor axis diameter) of 4 to 15, an X-ray crystallite size D.sub.110 of 120 to 180 .ANG., a coercive force of 1720 to 2500 Oe, a saturation magnetization of not less than 110 emu/g, and a saturation magnetization decrement percentage of not more than 17%.

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patent: 5260132 (1993-11-01), Nakazuni et al.
patent: 5378380 (1995-01-01), Isoai et al.
patent: 5466306 (1995-11-01), Mishima et al.
patent: 5480571 (1996-01-01), Isoai et al.
patent: 5599378 (1997-02-01), Mishima et al.

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