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To optimize the magnetic properties of nanocomposite Nd9Fe85B6 magnets, the as-quenched ribbons with different microstructures were prepared at six wheel velocities from 10 to 30 m s-1through rapid quenching,followed by a series of annealing treatments at 550–800 °C for 5–10 min. It is found that both the large initial grains at low cooling rate and high content of amorphous phase at high cooling rate cause a-Fe grains coarsening, which leads to a decline in the strength of exchange coupling interaction and the deterioration of magnetic properties. In order to optimize the magnetic properties, the as-quenched ribbons should be chosen with relatively small initial grains as well as a small amount of amorphous phase. For nanocomposite Nd9Fe85B6 materials, the optimized magnetic properties of Hcj= 446 kA m-1, Br= 0.86 T,(BH)max=80 kJ m-3are obtained for ribbons prepared at 18 m s-1after annealing at 620 °C for 5 min.
To optimize the magnetic properties of nanocomposite Nd9Fe85B6 magnets, the as-quenched ribbons with different microstructures were prepared at six wheel velocities from 10 to 30 m s-1through rapid quenching, followed by a series of annealing treatments at 550-800 ° C for 5 -10 min. It is found that both of the large initial grains at low cooling rate and high content of amorphous phase at high cooling rate cause a-Fe grains coarsening, which leads to a decline in the strength of exchange coupling interaction and the deterioration of In order to optimize the magnetic properties, the as-quenched ribbons should be chosen with the relatively small initial grains as well as a small amount of amorphous phase. For nanocomposite Nd9Fe85B6 materials, the optimized magnetic properties of Hcj = 446 kA m- 1, Br = 0.86 T, (BH) max = 80 kJ m-3are obtained for ribbons prepared at 18 m s-1 after annealing at 620 ° C for 5 min.