Abstract
In recent years, there is an urgent need to improve the preparation process of Nd–Fe–B magnets to obtain magnets with high coercivity and magnetic energy products. In this study, we introduced the mechanical ball-milling process into the chemical preparation process of the magnetic powder, and the as-synthesized magnetic powder has a (BH)max of 5.5 MGOe and a Hc of 4.4 kOe. X-ray diffraction and X-ray photoelectron spectroscopy analysis have shown that the milling process does not introduce new impurity phases while also making the raw material powder more refined, which promotes the formation of the main phase Nd2Fe14B. Furthermore, the Henkel plots indicate that the presence of α-Fe is responsible for the increased exchange coupling effect and improved magnetic properties.
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