Abstract
A strong dependence of the intrinsic coercive force on the amount of samarium present in (Pr,Sm)Co5 permanent magnets has been observed. These magnets were nominally 63 wt% Co, with five compositional variations in the rare‐earth content ranging from 20.70 wt% Pr−16.30 wt% Sm to 27.75 wt% Pr−9.25 wt% Sm being studied. The sintering temperatures were varied for each composition, holding the sintering time constant at 30 min. The maximum intrinsic coercive force achieved during sintering increased rapidly with samarium content from 2.6 kOe for the 9.75 wt% Sm alloy to 22.4 kOe for the 16.3 wt% Sm alloy.

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