Process for controlling ferrous iron content in manganese zinc f

Details Process for controlling ferrous iron content in manganese zinc f Process for controlling ferrous iron content in manganese zinc f

1985-08-01

1990-01-09

Doll, John

Compositions

Magnetic

Chromium or chromium compound containing

252 6256, 423594, 423DIG15, C04B 3526

Patent

active

048926728

ABSTRACT:
Process of calcining the ball milling manganese zinc MnZn, ferrite material for achieving a ferrite having a ferrous iron content appropriate for optimum magnetic properties. A first initial ball milling step is very carefully controlled as a small amount of metallic iron is blended into an initial mixture which is a catalyst for the ferrous iron reduction reaction during a calcine step. This provides for a predetermined ferrous iron content to be set in the powder prior to any forming or firing steps. The process includes a controlled atmosphere, time, and temperature for the calcining process step, and a second controlled ball milling step over time where the interaction of the stainless steel balls and milled slurry contributes to final ferrous iron content. These two process steps are balanced yielding a MnZn ferrite powder of a predetermined particle size with a controlled ferrous iron content which is a function of both the calcining and ball milling steps.

REFERENCES:
patent: 2886529 (1959-05-01), Guillaud
patent: 3015538 (1962-01-01), Weber et al.
patent: 3424685 (1969-01-01), Pierrot et al.
patent: 3948785 (1976-04-01), Berchtold
patent: 4097392 (1978-06-01), Goldman et al.
patent: 4247500 (1981-01-01), Dixon et al.
patent: 4440713 (1984-04-01), Rigby

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