Preparation and Properties of Barium Ferrite Using Hot‐Rolled Mill Scale

Abstract

Commercial‐quality barium ferrite was made on a laboratory scale by the solid‐state reaction of raw hot‐rolled mill scale and barium carbonate. The quality of the isotropic magnets reached coercivity Hc 1750 Oe, remanence Br 2200 G, and maximum energy product (BH)max 1.0 × 106 G · Oe and that of the anisotropic magnets formed by dry powder die pressing Hc 2000 Oe, Br 3500 G, and (BH)max 2.6 × 106 G · Oe. The amount of the additives was in the range 0.4 to 0.8 wt%. The processing parameters were reported. The mechanism of ferrite formation was proposed.