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Alloyed In metal-bonded magnets with ρ=∼6.5 g cm-3 were molded from surface-coated fine powders, Zn/Sm2Fe17Nx (x=∼3), under conditions of 1.4 GPa, ∼460 K, and 1.4 MA m-1 by adding an appropriate amount of In metal powder. The resulting In–Zn alloy with an eutectic composition served as the metal binder and the lowered melting point was responsible for improving the effective alignment of the Sm2Fe17Nx particles along a direction of the applied magnetic field for the bonded magnets. The following high-performance magnetic characteristics were attained: (BH)max=∼151 kJ m-3, Br=∼0.96 T, and Hcj=∼0.72 MA m-1. In–Zn metal-bonded Sm2Fe17Nx magnets showed good thermal stability, good oxidation resistance, and high densification due to effective surface coating by the In–Zn eutectic alloy. The temperature dependence of reversible flux losses measured over temperatures from 273 to 393 K provided a thermal coefficient of α(Br)=-0.06 % K-1. © 2000 American Institute of Physics.
Journal of Applied Physics
Date of Publication:
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