MELT-SPUN SM(COFECUZR)(Z)M-X (M=B OR C) NANOCOMPOSITE MAGNETS

The objective of this sandy was to produce a nanocrystalline Sm(CoFeCu Zr)(z) magnet consisting of magnetically hard Sm2Co17/SmCo5 phases and soft Fe (Co) phases. For this we have prepared melt-spun ribbons of S m(Co0.65Fe0.28Cu0.05Zr0.02)(z)B-x with z = 7.0, 7.9, 8.5, 9.0, x = 0, 0.5, 1.0, and Sm(Ca0.06Fe0.23Cu0.05Zr0.02C0.1)(z) with z = 7.7, 8.5, 9 .0 and 9.5 and determined their crystallization temperatures, crystal structure, structure morphology and magnetic properties, It was found that the magnetic properties were very sensitive to the nominal compos ition and processing parameters, Increasing the boron content from x = 0.5 to x = 1.0 resulted in samples with higher alpha-Fe content and r educed coercivity, Energy products up to 8MGOe and reduced remanence a s high as 0.72 were observed. In general the boron containing samples gave higher values of coercivity and of reduced remanence because thei r microstructure was finer.