Experiments in the Liquid Phase Sintering of Sm[sub 2]Co[sub 17]

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Abstract
An initial investigation of the liquid phase sintering of Sm 2 Co 17 using a 60 wt% Sm ‐ 40 wt% Co sintering aid has been conducted. The total samarium content was varied from 25.3 wt% to 34.5 wt% through sintering aid additions, with the resulting phases present in the sintered magnets being uncertain. The sintering temperature was varied from 1110°C to 1140°C for a sintering time of 30 minutes. With the exception of the saturation induction, Bs, which decreased approximately 20%, the magnetic properties increased with increasing samarium content. This was particularly true of the intrinsic coercive force, Hci, which increased as much as eighteenfold, while the coercive force, Hc, and the energy product, (BH)max, each increased approximately sixfold. The residual induction, Br, also increased, but only by approximately 20%. The best initial results yielded a magnet with the following properties: B r = 6.0 kG , H c = 3.8 kOe , H ci = 9.0 kOe and ( BH ) max = 6.4 MGOe .

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