高モル比ストロンチウムフェライト磁石の磁気特性に及ぼす添加物の影響

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An investigation on the effect of additives on magnetic properties of higher moleratio strontium ferrite magnets than stoichiometric value was made. By addition of SiO2 and CaO to 6.0∼6.2mol-ratio ferrites which were calcined at 1250°C, magnetic properties were improved. Optimum amount of SiO2 and CaO is 0.7∼1.0% and 1.0∼1.4% respectively. In this case, second phase of Si-Ca-Fe-O are formed on the surface of the Sr-Ca ferrite grains, and C plains of ferrite crystals grow preferentially during sintering, so that orientation is developed with increasing of sintering temperature. Addition of Al2O3 improved intrinsic coercive force when SiO2 and CaO are also added, and extremly high magnetic properties Br: 3800G, IHC: 5000Oe by addition of 2.5% Al2O3 was obtained.
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