Process for producing magnetic metal particles

Details Process for producing magnetic metal particles Process for producing magnetic metal particles

1994-03-04

1995-09-19

Wyszomierski, George

Specialized metallurgical processes, compositions for use therei

Processes

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

75349, 148105, B22F 920, H01F 120

Patent

active

054512450

ABSTRACT:
Acicular magnetic iron particles comprising acicular iron substrate particles having first layer consisting of at least one of hydrous oxides and anhydrous oxides of aluminum and zirconium and mixtures thereof and second layer consisting of hydrous oxides and anhydrous oxides of aluminum and mixtures thereof coated on the surfaces of the particles are produced by coating the surfaces of hydrated iron oxide particles as substrate with at least one of aluminum compounds and zirconium compounds, then heating the coated substrate particles to convert to hematite particles, thereafter coating the surfaces of the resultant hematite substrate particles with at least one of aluminum compounds, and then reducing under heat the coated hematite particles.

REFERENCES:
patent: 4390361 (1983-06-01), Sueyoshi et al.
patent: 5185093 (1993-02-01), Ichikawa et al.

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