Improvement of the density of metal-bonded Sm/sub 2/Fe/sub 17/N/sub x/ (x approximately=3) magnets

Different routes for the comparison of Sm/sub 2/Fe/sub 17/N/sub x/ alloy-powders are investigated. By addition of 2 to 5 wt.% Bi or Wood's alloy-powders metal-bonded magnets with densities of about 6 g/cm/sup 3/ are obtained. The magnetic properties are not significantly improved. Compaction of a 25-40 mu m Sm/sub 2/Fe/sub 17/N/sub x/ alloy-powder fraction with 15 wt.% Zn results in a density of 5.8 g/cm/sup 3/; the maximum energy density of such magnets amounts to 68 kJ/m/sup 3/. The density of Zn-compacted magnets produced from nitrogenated jet-milled Sm/sub 2/Fe/sub 17/ alloy-powders amounts only to 4.8 g/cm/sup 3/, but an energy density of 64 kJ/m/sup 3/ could be achieved.<
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