Abstract
Nanocomposite magnets have attracted much attention because of their ultra-high theoretical magnetic energy product and saving rare earth resources. In this study, the Fe93.5Si6.5 with higher hardness than the most common soft magnetic phase (α-Fe) was used to synthesize SmCo5/Fe-Si nanocomposite magnets, and its nanosized process was studied. The results showed that Fe-Si can be well dispersed into SmCo5 matrix through 12 hours of ball milling, and appeared in fine and evenly distributed grains in the SmCo5/Fe-Si nanocomposites, indicating it is suitable for soft magnetic phase. The nanosized process of Fe-Si phase can be summarized as from the irregular shape of agglomeration, to long chain, and finally too uniformly dispersed Fe-Si particles with increased milling time. As a result, the SmCo5/Fe-Si nanocomposite magnet with the optimal maximum magnetic energy product was 14.3 MGOe, accompanied by remanence of 9.5 kG and coercivity of 8.2 kOe. Our results show that by using Fe-Si with high hardness as the soft magnetic phase, the prepared nanocomposite magnet not only has good properties, but also can be expected that the two phases with closer mechanical properties can be deformed harmoniously.
Highlights
Nanocomposite permanent magnets composed of soft magnetic phase with high saturation magnetization and hard magnetic phase with high magneto-crystalline anisotropy field need ideal microstructure to stimulate good exchange coupling and high magnetic energy product
Its theoretical magnetic energy product of more than 1MJ/m3, saving rare earth resources, good mechanical and corrosion resistance still attract the interest of researchers
The saturation magnetization (Ms) of Fe-Si particles is 18.5 kG, which is much higher than the Ms of the corresponding hard magnetic phase (SmCo5)
Summary
Nanocomposite permanent magnets composed of soft magnetic phase with high saturation magnetization and hard magnetic phase with high magneto-crystalline anisotropy field need ideal microstructure to stimulate good exchange coupling and high magnetic energy product. its theoretical magnetic energy product of more than 1MJ/m3, saving rare earth resources, good mechanical and corrosion resistance still attract the interest of researchers. Many rare earth transition intermetallic compounds with ultra-high magneto-crystalline anisotropy are candidates for hard magnetic phase. Nanocomposite permanent magnets composed of soft magnetic phase with high saturation magnetization and hard magnetic phase with high magneto-crystalline anisotropy field need ideal microstructure to stimulate good exchange coupling and high magnetic energy product.. Its theoretical magnetic energy product of more than 1MJ/m3, saving rare earth resources, good mechanical and corrosion resistance still attract the interest of researchers.. Many rare earth transition intermetallic compounds with ultra-high magneto-crystalline anisotropy are candidates for hard magnetic phase. For the soft magnetic phase, generally only Fe, Co and their alloys are candidates due to ultra-high saturation magnetization. It is difficult to obtain ideal texture for nanocomposites, which is necessary to form good magnetic anisotropy and achieve high magnetic energy product, due to the uncoordinated deformation caused by the difference in mechanical properties between soft (toughness) and hard (brittleness) magnetic phases.. It is difficult to obtain ideal texture for nanocomposites, which is necessary to form good magnetic anisotropy and achieve high magnetic energy product, due to the uncoordinated deformation caused by the difference in mechanical properties between soft (toughness) and hard (brittleness) magnetic phases. the modification of mechanical properties of two phases is of great significance for the preparation of high-performance nanocomposites.
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