Magnetic properties and microstructure of rapidly quenched SmZrFeCoN magnets

Dependence of magnetic properties and microstructure on boron additions for nitrogenated (Sm,Zr)(Fe,Co)/sub 9/ alloys fabricated by rapidly quenching was investigated. The condition for getting high (BH)/sub max/ with high /sub i/H/sub c/ is to produce an amorphous phase in the rapidly quenched sample because it leads to the precipitation of uniform and fine grains by the annealing above their crystallization temperature. The role of boron is to form the amorphous phase easily by rapidly quenching. High (BH)/sub max/ of about 20 MGOe with high /sub i/H/sub c/ of 9.6 kOe was obtained for nitrogenated (Sm/sub 0.7/Zr/sub 0.3/)(Fe/sub 0.95/Co/sub 0.05/)/sub 9/B/sub 0.1/. High (BH)/sub max/ of 13.0 MGOe was also attained as an isotropic resin bonded magnet with density of 6.2 g/cm/sup 3/.