Influence Of Iron Powders On The Magnetic Performance And Microstructure Of SmCo/α-(Fe,Co) Nanocomposite Magnets

The direction of technology is automation and light-weight. Human development hascaused a depletion of natural energy resources and climate changes with unpredictableconsequences. Nanoscale hard magnetic materials, especially exchange-couplednanocomposite magnets have demonstrated new opportunities for development of futuregenerations of permanent magnets.Iron powder which comes form different preparation method have great influence onthe magnetic properties of SmCo/α-(Fe, Co) nano-composite permanent magnets. In thispaper, SmCo/α-(Fe, Co) nanocomposte permanent magnetic powders with different kindsof iron powders were synthesized via the combination of high energy ball milling,followed by studies on micro-structure and magnetic properties using scanning electronmicroscope (SEM), X-ray diffraction (XRD), employing differential scanning calorimetry(DSC) and vibrating sample magnetometer (VSM) techniques.When choosing iron powders which were obtained by electrolytic route, Theprecipitation process as follows: amorphous phase crystallize to SmCo7, SmCo5transformto SmCo7. The grain of soft magnet is hard to increase during the process of heat treatment,the magnetic energy product is8.8MGOe. When choosing the iron powders obtained byatomization method, the precipitation process only contains amorphous phase crystallizeto SmCo7, and the grain of soft phase is easy to increase. Therefore the magnetic energy isonly5.5MGOe.Iron powders produced by electrolytic route are more conducive to dispersion andamorphization of powders during high energy ball milling. Moreover, it’s possible tocontrol the content of SmCo7and SmCo5through changing the ball milling parameters orheat treatment.