Effect of Wheel Speed on Magnetic Properties of Nd 10 Fe 85− x Co x B 5 ( x = 0 to 40) Nanocomposite Ribbons

Nd 2 Fe 14 B/Fe(Co) nanocomposite ribbons were successfully fabricated by the melt-spinning technique. Nd 10 Fe 85− x Co x B 5 ( x = 0, 10, 20, 30, and 40) prealloys were used as starting materials, and the wheel speed was varied from 10 m/s to 20 m/s. The effects of substitution of Fe by Co and the wheel speed were investigated to enable direct preparation of high-performance nanocomposite ribbons. It was found that the optimal wheel speed depended on the Co content in the ribbons. The highest energy product ( BH ) max of the as-spun ribbons reached 144.3 kJ/m 3 when using the optimal speed of 16 m/s for Nd 10 Fe 65 Co 20 B 5 . By annealing the ribbons at 873 K and 973 K for 30 min, the magnetic properties of the Nd 10 Fe 65 Co 20 B 5 nanocomposite ribbons obtained at a speed of 20 m/s were significantly improved. The microstructure and magnetic properties of the prepared ribbons are discussed in detail.