Abstract
Several technological factors which affect the permanent magnetic performance of Sm 2Fe 17N x magnets, such as the phase composition (especially α-Fe), nitrogen and oxygen contents, as well as the ball milling speed and time, have been systematically examined. The coercivity increases with decreasing α-Fe content. Oxidation leads to decreases in the saturation magnetization and remanence. The nitrogen content dependence of either the coercivity or remanence shows a maximum at x = 3. The remanence and coercivity as functions of the ball milling time also show maxima. Compared with high energy ball milling, low energy ball milling is more suitable for improving the coercivity and the remanence. Sm 2Fe 17N x powder magnets with B r = 1.2 T, μ 0i H c = 0.8 T and ( BH) max = 25 MGOe have been obtained.
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