Study on the influence of planetary ball mill parameters on magnetic properties of SmCo5 powder.

Nanocrystalline SmCo₅ powder is one of the most widely used hard magnetic materials for preparing nanocomposite permanent magnets due to its high coercivity and strong magnetic coupling. In this study, surfactant-assisted ball milling was used to prepare SmCo₅ micro-nanosheets, and the influence of ball milling time, ball-to-powder ratio, and surfactant content on the morphology and magnetic properties of SmCo₅ powder was systematically investigated using a planetary ball mill. The results showed that with increasing ball milling time and ball-to-powder ratio, the particle size and thickness of SmCo₅ powder decreased and transformed into micro-nanoflakes. When the ball milling time and ball-to-powder ratio exceeded 4 h and 12:1, respectively, the particle size and thickness of SmCo₅ powder did not change significantly. The SmCo₅ powder exhibited the optimal magnetic property, a remanence of 45.9 Am²/kg and a coercivity of 1.13x10⁶ A/m, when choosing the ball-to-powder ratio of 16:1, the ball milling time of 2 h, and the surfactant content of 30%. [ABSTRACT FROM AUTHOR]