Process for preparing magnetic particles with metallic region th

Details Process for preparing magnetic particles with metallic region th Process for preparing magnetic particles with metallic region th

1980-06-06

1982-03-09

Stallard, W.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

148 635, 148105, 148 315, H01F 109, H01F 133

Patent

active

043187358

ABSTRACT:
Fine magnetic particles with high saturation magnetization (over 140 emu/g) as well as high stability against oxidation in air, are produced by a process which comprises the first stage of oxidizing the surfaces of metallic particles consisting mainly of iron in an atmosphere containing both H.sub.2 O and H.sub.2 gases at an oxidizing temperature below 900.degree. C., and the second stage of further oxidizing the surfaces of the particles produced at the first stage in an atmosphere containing O.sub.2 gas.

REFERENCES:
patent: 2853407 (1958-09-01), Rogers
patent: 3120698 (1964-02-01), Elliot
patent: 3767477 (1973-10-01), McCabe et al.
patent: 4158561 (1979-06-01), Pavlik et al.

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