Process of manufacturing ferrite bodies of low porosity

Details Process of manufacturing ferrite bodies of low porosity Process of manufacturing ferrite bodies of low porosity

1973-05-18

1976-11-02

Arnold, Donald J.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

252 6256, 252 6259, 264 65, C04B 3560, C04B 3526

Patent

active

039897940

ABSTRACT:
A process for preparing ferrite materials exhibiting an excellent combination of physical and magnetic properties is disclosed. In this process a ferrite powder is formed and subsequently sintered while exerting a mechanical pressure of about 5 to about 500 kg. per square centimeter on the ferrite. The oxygen content of the ferrite is maintained substantially stoichiometric throughout the process by controlling the oxygen content of the ambient atmosphere. Temperatures in the range of about 1100.degree. to about 1400.degree. C during sintering are disclosed. New ferromagnetic ferrite compacts which can be prepared by this process are characterized by an oxygen content which is substantially stoichiometric and a porosity no greater than about 0.4%.

REFERENCES:
patent: 2990602 (1961-07-01), Brandmayr
patent: 3383737 (1968-05-01), Greger
patent: 3573208 (1971-03-01), Brockman et al.

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