Influence Of Alloy Elements On The Microstructure And Magnetic Performance Of SmCo/α-(Fe, Co)nanocomposite Magnets

As the converter between electrical energy and mechanical energy, permanent magnets play an important role in almost every aspect of society. Especially in the current energy crisis and environmental pollution need higher requirements on the performance of the permanent magnets. The development of single-phase rare earth permanent magnet has entered a bottleneck period. Nanocomposite permanent magnets which is the theory of magnetic energy product is twice that of single-phase Nd2Fe14 B is expected to become the new generation of permanent magnets. SmCo/α-(Fe, Co) nanocomposite permanent magnet is the best choice of the next generation of permanent magnets, especially under the environment of high temperature. This article uses the high energy ball milling(SPEX),differential scanning calorimetry(DSC), X-ray diffraction(XRD), vibrating sample magnetometer(VSM), and other techniques. We have further studied the influence of the different mass fraction of alloy elements(Cu, Zr) on the microstructure phase transformation, magnetic and coercive force mechanism of SmCo/α-(Fe, Co)nanocomposite permanent magnets via high-energy ball milling.First, choosing the optimum ball milling parameters to prepare of amorphous precursors SmCo/α-(Fe, Co) nanocomposite permanent magnet, and then phase transtion process and microstructure was studied by DSC and XRD spectrum. Studies have shown that A type SmCo/α-(Fe, Co) nanocomposite magnets, the precipitation of SmCo/α-(Fe, Co)nanocomposite magnets is always SmCo7 phase. Alloy elements(Cu, Zr) is helpful to reduce the temperature of amorphous phase crystallize to SmCo7. B type SmCo/α-(Fe, Co)nanocomposite magnets, with the increase of annealing temperature phase transition behavior change, phase transition order: crystal amorphous crystrallize to SmCo5 phase,amorphous phase crystrallize to SmCo7, SmCo5 transform to Sm Co7. the more alloy elements(Cu, Zr), the more crystallization temperature of SmCo5 and SmCo7 phase is reduced.A type SmCo/α-(Fe, Co) nanocomposite magnets, alloy elements(Cu, Zr) was beneficial to the improvement of the coercive force and magnetic energy product. Whenannealing temperture is 730 ℃, the mass fraction of(Cu, Zr) is 0.57%, maximum magnetic energy product is 9.37 MGOe. B type SmCo/α-(Fe, Co) the nanocomposite magnets alloy elements(Cu, Zr) added was beneficial to the improvement of the coercive force, remanence ratio, and magnetic energy product. When annealing temperture is 580℃,the mass fraction is 5.1%, maximum magnetic energy product is 9.43 MGOe.