Magnetic Properties of Melt-Spun Nd-Fe-Co-B-V Alloys and Their Bonded Magnets

Melt-spun ribbons of Nd-Fe-Co-B-V alloys were prepared by the single-roller rapid-quenching method, and the effects of V substitution and the substrate surface velocity on the magnetic properties were studied. The magnetic properties of isotropic bonded magnets fabricated from ribbons quenched under optimum conditions were also measured. A maximum energy product of 152.7 kJ/m³ was obtained for the Nd11Fe72Co8B7.5V1.5 alloy ribbon prepared at a substrate surface velocity of 17.1 m/s. The magnetic properties of these high-quality ribbons are isotropic. The maximum energy product obtained from these bonded magnets of Nd11Fe72Co8B7.5V1.5 alloy was 92.8 kJ/m³.