Fabrication of Fe₇₈Si₁₃B₉ magnetic materials by spark plasma sintering technology

Fe₇₈Si₁₃B₉ magnetic amorphous powder was prepared by high-energy ball-milling and then was consolidated in several solid sample at different sintering temperature by spark plasma sintering technology. The phase composition, glass transition temperature (T_g), onset crystallization temperature (T_x) and peak temperature (T_p) of Fe₇₈Si₁₃B₉ amorphous alloy powders were analyzed by XRD and DSC. The phase transition, microstructure, mechanical properties and magnetic performance of the bulk alloys in different sintering temperature were discussed by XRD, SEM, and vibration sample magnetometer, etc. It is found that with the increase of the sintering temperature at the pressure of 500 MPa, the amorphous phase begins to crystallization gradually and the density, compressive strength, micro-hardness and saturation magnetization of the sintering sample improve significantly. The desirable amorphous nanocrystalline magnetic material at the sintering temperature of 823.15 K and under the pressure of 500 MPa has a density of 6.6 g/cm³, compressive strength of 1500 MPa and a saturation magnetization of 1.3864 T.