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High quality permanent magnet materials prepared by hot-pressing of very fine ferrite powders

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2 Author(s)
Oron, M. ; IEEE TMAG ; Ramon, P.

Very fine barium ferrite powders exhibiting good magnetic properties were recently produced by IMI (Israel Mining Industries) employing a special thermochemical process. Conventional sintering of these powders considerably lowered their magnetic properties. A hot-pressing process was therefore developed which yielded dense bulk samples of good magnetic properties. The optimal conditions of this process were found to be: temperature, T = 1000°C, pressure, P = 400 kg/cm2and duration time, t = 5 sec. Under these conditions a minimum average grain size of 0.5 μm was achieved giving rise to an intrinsic coercivity ofIHc=4.32 kOe. Partial orientation effects of the hot-pressing process raised the remanence value from Br=1.36 kG for the powder to Br=2.88 kG for the hot-pressed bulk sample.

Published in:

Magnetics, IEEE Transactions on  (Volume:11 ,  Issue: 5 )

Date of Publication:

Sep 1975

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