異方性BaFe_2-W型フェライト磁石の磁気特性 : 第1報

概要

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An experiment was carried out to investigate the effect of Ba-Stearate as a reducing agent on the magnetic and physical properties of anisotropic BaFe2-W type ferrite magnets. It was found that the magnetic properties of BaO·8.5Fe2O3 were improved by adding 0.3 wt% of Ba-Stearate, 0.5 wt% of SiO2, and 0.5 wt% of CaO together. The optimum conditions for making magnets were as follows; Chemical composition: Ba1.029Ca0.127Si0.097C0.053Fe2+2.456Fe3+15.392O27, semisintering condition: 1350°C×4.0 h in nitrogen gas atmosphere, drying condition: 180°C×2.0 h in air, sintering condition: 1160°C×1.5 h in nitrogen gas atmosphere. Magnetic and physical properties of a typical sample were Jm = 0.46 T, Jr = 0.43 T, HcJ = 182.3 kA/m, HcB = 177.2 kA/m, (BH)max = 33.8 kJ/m3, Tc = 495°C, HA = 1332 kA/m and KA = 2.65×105J/m3. The lattice constants of this compound were a = 5.883×10−10m, c = 32.92×10−10m, and c/a = 5.596.
社団法人粉体粉末冶金協会の論文
2006-07-15