Process for preparing a ferromagnetic material

Details Process for preparing a ferromagnetic material Process for preparing a ferromagnetic material

1995-01-26

1997-07-15

Bonner, Melissa

Etching a substrate: processes

Forming or treating article containing magnetically...

252 6256, 252 6262, 264613, C04B 3526

Patent

active

056480156

ABSTRACT:
A process for preparing a ferrite in which a green body containing at least about 50 weight percent of iron compound is first sintered and then cooled. During the cooling cycle, from about 1,000 to about 700 degrees centigrade, the body is contacted with a reduced oxygen atmosphere containing less than 10 volume percent of oxygen. From 700 to 200 degrees centigrade, the reduced oxygen atmosphere contains less than 1 part per thousand of oxygen. Thereafter, the sintered body is treated to remove at least some sharp edges and to change its permeability; and it is then contacted with an etchant.

REFERENCES:
patent: 3860524 (1975-01-01), Goldman
patent: 4247500 (1981-01-01), Dixon et al.
Ferromagnetic Materials, vol. 2, ed. Wohlfarth, 1980, p. 208 no month.

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