The microstructure and magnetic properties of nanocomposite SmCo 5 /Sm 2 Co 17 , Sm 2 (CoFe) 17 , Sm 2 (CoFeZr) 17 , Sm 2 (CoFeCuZr) 17 powders prepared by intensive milling and subsequent annealing have been studied systematically. A small amount of Fe substitution for Co was found to slightly increase the saturation magnetization and maximum energy product of SmCo 5 /Sm 2 Co 17 powders. The coercivity is enhanced by Zr and especially Cu. The highest maximum energy product of 11.5 MGOe and coercivity of 2.4 T were obtained in 40% SmCo 5 + 60% Sm 2 (Co 0.9 Fe 0.1 ) 17 and 40% SmCo 5 + 60% Sm 2 (Co 0.74 Fe 0.1 Cu 0.12 Zr 0.04 ) 17 powders, respectively. All the hysteresis loops showed a smooth demagnetization curve. A few percent of Zr substitution proved to be effective in refining the microstructure and Cu increased the volume fraction of SmCo 5 phase in the mixture of two phase powders. Measurements of δ M and recoil curves indicated that intergranular exchange coupling and exchange spring magnet behaviour were observed in the above samples.
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Yan et al. (2002) studied this question.
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