異方性プラスチック磁石の製造条件と磁気特性の関係について

概要

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In order to produce a high performance anisotropic plastic bonded magnet which was composed of ferrite powder and thermoplastic material, forming by injection moulding in magnetic field was studied.The results obtained were as follows;(1) High magnetic properties were obtained in case that particle size of ferrite powder was 1.0∼1.2μ.(2) Magnetic properties were greatly increased by annealing of ferrite powder at 950∼1050°C before blending with plastic material.(3) Br and bHc increased rapidly as a function of higher magnetic field strength, and saturated for about 10000Oe when magnetizing time was over one second.(4) Increasing of content of ferrite powder in plastics improved magnetic properties, but deteriorated moulding properties. Br 2300∼2500G, bHc 1900∼2300Oe, and (BH)max 1.2∼1.4MGOe were obtained for about 89wt.% of ferrite powder.
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