Abstract
An experiment was carried out to examine the effect of composition, heat treatment, and nitrogenation conditions on the magnetic properties of Sm-Fe-Co-Mn nitrides with TbCu7-type structure. The optimum preparation conditions of the compounds were as follows: composition {Sm10(Fe0.9Co0.1)89.5Mn0.5}84N16; roller velocity 50 m/s; heat treatment 700°C × 60 min in high-purity Ar gas; and nitrogenation condition 420°C × 15 h in high-purity N2 gas. Typical magnetic properties of the obtained powders were as follows: J(r = 0.96 T, HcJ = 699.2 kA/m, (BH)max = 138.3 kJ/m3 (17.4 MGOe), and Tc = 508°C. Recoil loops of the hysteresis curve and X-ray analysis showed that the sample was an exchange spring magnet. The value of (BH)max of the bonded magnet prepared from {Sm10(Fe0.9Co0.1)89.5Mn0.5}84N16powder was 92.1 kJ/m3 (11.6 MGOe) when the density of the bonded magnet was 6.05 Mg/m3. The magnetization process of these nitrides is of the pinning-type. The reversible temperature coefficient of J(SUB>r was α(J(SUB>r) = -0.04%/°C in the range from 25°C to 125°C.
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