摘要
Effect of Co substitution and annealing treatment on the formation, magnetic properties and microstructure of （NdDyTb）12.3（FeZrNbCu）81.7.xCoxB6 （x=0-15） ribbons prepared by rapid quenching and subsequent annealing was systematically investigated by means of differential scanning calorimeter （DSC）, X-ray diffraction （XRD）, high resolution scanning electron microscopy （HRSEM） and vibrating sample magnetometer （VSM）. Phase analysis revealed single-phase material. The remanence polarization Jr and maximum energy product （BH）max increased with increasing x from 0 to 12 and then decreased for x=15. The intrinsic coercivity Hci of （NdOyTb）12.3 （FeZrNbCu）81.7-xCoxB6 ribbons optimally processed decreased from 1308.7 kA/m for x=0 to 817.4 kA/m for x=15. Optimum magnetic properties with Jr=1.041 T, Hci=944.9 EA/m and （BH）max=155.1 kJ/m^3 were achieved by annealing melt-spun ribbon （x=12） at 675 ℃ for 10 min. There was no significant influence of Co substitution on microstructure.
Effect of Co substitution and annealing treatment on the formation, magnetic properties and microstructure of （NdDyTb）12.3（FeZrNbCu）81.7.xCoxB6 （x=0-15） ribbons prepared by rapid quenching and subsequent annealing was systematically investigated by means of differential scanning calorimeter （DSC）, X-ray diffraction （XRD）, high resolution scanning electron microscopy （HRSEM） and vibrating sample magnetometer （VSM）. Phase analysis revealed single-phase material. The remanence polarization Jr and maximum energy product （BH）max increased with increasing x from 0 to 12 and then decreased for x=15. The intrinsic coercivity Hci of （NdOyTb）12.3 （FeZrNbCu）81.7-xCoxB6 ribbons optimally processed decreased from 1308.7 kA/m for x=0 to 817.4 kA/m for x=15. Optimum magnetic properties with Jr=1.041 T, Hci=944.9 EA/m and （BH）max=155.1 kJ/m^3 were achieved by annealing melt-spun ribbon （x=12） at 675 ℃ for 10 min. There was no significant influence of Co substitution on microstructure.
