Title :
Melt-spun Sm(CoFeCuZr)zMx (M=B or C) nanocomposite magnets
Author :
Manrakhan, W. ; Withanawasam, L. ; Meng-Burany, X. ; Gong, Wei ; Hadjipanayis, G.C.
Author_Institution :
Dept. of Phys. & Astron., Delaware Univ., Newark, DE, USA
fDate :
9/1/1997 12:00:00 AM
Abstract :
The objective of this study was to produce a nanocrystalline Sm(CoFeCuZr)z magnet consisting of magnetically hard Sm2 Co17/SmCo5 phases and soft Fe(Co) phases. For this we have prepared melt-spun ribbons of Sm(Co0.65Fe 0.28Cu0.05Zr0.02)zBx with z=7.0, 7.7, 8.5, 9.0, x=0, 0.5, 1.0, and Sm(Co0.60Fe0.23Cu0.05Zr0.02C 0.1)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 composition and processing parameters. Increasing the boron content from x=0.5 to x=1.0 resulted in samples with higher α-Fe content and reduced coercivity. Energy products up to 8 MGOe and reduced remanence as high as 0.72 were observed. In general the boron containing samples gave higher values of coercivity and of reduced remanence because their microstructure was finer
Keywords :
boron alloys; coercive force; copper alloys; crystal microstructure; crystal structure; crystallisation; ferromagnetic materials; iron alloys; melt spinning; nanostructured materials; permanent magnets; remanence; samarium alloys; zirconium alloys; CoFeCuZrB; CoFeCuZrC; coercivity; crystal structure; crystallization temperatures; energy products; magnetic properties; magnetically hard Sm2Co17/SmCo5 phases; melt-spun nanocomposite magnets; melt-spun ribbons; microstructure; nanocrystalline Sm(CoFeCuZr)z magnet; nominal composition; processing parameters; remanence; soft Fe(Co) phases; structure morphology; Boron; Coercive force; Crystallization; Iron; Magnetic properties; Microstructure; Morphology; Remanence; Temperature sensors; Zirconium;
Journal_Title :
Magnetics, IEEE Transactions on
