Process for producing a magnet of strontium ferrite having high

Details Process for producing a magnet of strontium ferrite having high Process for producing a magnet of strontium ferrite having high

1990-03-30

1991-10-29

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

252 6263, 264 63, 264118, 264122, 264125, 264DIG58, C04B 3526, C04B 3564

Patent

active

050614126

ABSTRACT:
An iron ore or mill scale is crushed to form a powder having an average particle diameter not exceeding 12 microns. The powder is heated at a temperature of 600.degree. C. to 900.degree. C. in the presence of oxygen to form an iron oxide containing at least 98.0% of Fe.sub.2 O.sub.3. The iron oxide is mixed with strontium oxide or carbonate. The mixture is calcined to form strontium ferrite. The calcined product is pulverized, the crushed material is molded in a magnetic field, and the molded product is sintered to yield a magnet of strontium ferrite having a high level of performance.

REFERENCES:
patent: 3855374 (1974-12-01), Brailowsky et al.
patent: 4062922 (1977-12-01), Olson et al.
patent: 4411807 (1983-10-01), Watanabe et al.
patent: 4457851 (1984-07-01), Tabaru et al.

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