Abstract
Experiments were carried out to investigate the magnetic properties of Sm-Fe-Co-W system nitriding compounds with TbCu7-type structure. Smy(Fe0.95Co0.05)100-x-yWx(x=0-1.0, y=8-11) alloy ribbons were prepared by the single roller rapid-quenching method, and the effects of alloy composition, and conditions of heat-treatment and nitrogenation, were examined with regards to their magnetic properties. The optimum preparation conditions of the compounds are as follows. Composition: {Sm10(Fe0.95Co0.05)89.7W0.3}85.0N15.0, roller velocity: 50 m/s, heat treatment: 675°C×60 min in high-purity Ar gas, and nitriding condition: 400°C×15 h in high-purity N2 gas. Typical magnetic properties of the obtained compound powders are HcJ=765.7 kA/m (9.62 kOe), Jr=0.93 T (96.40 emu/g), (BH)max=134.5 kJ/m3 (16.9 MGOe), and Tc=480°C. It was found that this sample was an exchange spring magnet from TEM photographs and recoil loops of the hysteresis curve. The value of (BH)max for the compression-molded isotropic bonded magnet prepared from the: {Sm10(Fe0.95Co0.05)89.7W0.3}85.0N15.0 powder is 95.0 kJ/m3 (12.0 MGOe), when the density of bonded magnet is 6.1 Mg/m3. And the reversible temperature coefficient of Jr is α(Jr)=-0.071 %/°C, the temperature coefficient of HcJ in the range from 25°C to 125°C obtained by a linear extrapolation is α(HcJ)=-0.42%/°C.
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