Abstract
Nanocomposite PrCo 5/Pr 2Co 17 powders, with different volume fraction of the Pr 2Co 17 phase, were synthesized by mechanical milling mixtures of PrCo 5 and Pr 2Co 17 alloy powders with the aim of enhancing the maximum energy product of PrCo 5-based powders. It is found that the saturation magnetization increases monotonously with the volume fraction of the Pr 2Co 17 phase while the coercivity decreases. As a result, the maximum energy product first increases with the Pr 2Co 17 phase, going through a broad peak, and then decreases with further increase of the Pr 2Co 17 phase. The highest maximum energy product of 11.8 MG Oe is obtained in a mixture consisting of 70% PrCo 5 and 30% Pr 2Co 17 phase. Microstructural studies reveal that a uniform nanoscale PrCo 5/Pr 2Co 17 microstructure with an average grain size of about 20 nm is developed in these PrCo 5/Pr 2Co 17 powders. Evidence of intergranular exchange coupling is found in the PrCo 5/Pr 2Co 17 powders, suggesting that the enhanced energy product is due to exchange coupling between the magnetically hard PrCo 5 and soft Pr 2Co 17 nanograins.
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