Abstract
Sm(Co,Zr)7/α-(Fe,Co) nanocomposite magnets were produced by extensive milling of the mixture of crushed as-cast SmCo6.8Zr0.2 powders and 10 wt. % iron powders followed by annealing. The iron powders were added either with 600 min premilling or without premilling. The phase structures are studied by XRD patterns and thermomagnetic curves (M−T). According to the results of XRD patterns, the structures of the Sm(Co,Zr)7/α-(Fe,Co) nanocomposite magnets made with the premilled Fe powders consist of SmCo7 phase and α-(Co,Fe) phase. However, the composite of Sm (Co,Zr)7/α-Fe nanocomposite made from Fe powders without premilling consists of SmCo7, α-(Co,Fe) and SmCo5 phases. The α-(Co,Fe) phase is further studied by XRD and thermomagnetic measurements. It indicates that different composition of α-(Co,Fe) phase was obtained in two Sm(Co,Zr)7/α-(Fe,Co) nanocomposite magnets made with the premilled α-Fe powders and without premilled α-Fe powders. The magnetic properties of the soft phase can be tailored. The intergrain exchange coupling strength of the Sm(Co,Zr)7/α-(Fe,Co) nanocomposite magnets is found to be influenced by the soft-phase grain size and properties.
Published Version
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