High coercivity in boron substituted Sm-Co melt-spun magnets

Coercivity of Sm(Co0.9Cu0.1)4.8 melt-spun ribbons

“…Melt-spinning technique has opened an alternate process window to fabricate high coercivity magnets [6][7][8]. The technique has attracted commercially due to the cost effectiveness compared to the conventional powder metallurgy technique for the production of bonded hard magnets.…”

“…The technique has attracted commercially due to the cost effectiveness compared to the conventional powder metallurgy technique for the production of bonded hard magnets. Attempts have been made to develop Sm-Co based isotropic magnets with very fine microstructure through this technique [9,10]. The melt-spinning process was also found to be effective in developing highly textured single phase (Sm,Gd)Co 5 magnets [11].…”

Sm(Co, Fe, Cu, Zr, C)8.2 ribbons for high-temperature magnets

“…Nanostructured or nanocomposite alloys were produced by milling or melt-spinning procedures, in order to obtain more easily and quickly magnetic properties similar to the sintered magnets. Small additions and/or substitutions of Co by small atoms, like boron and carbon, in bulk samples were found to change the lattice parameters and subsequently the magnetocrystalline anisotropy [2,3].Rapid solidification can stabilize metastable phases, such as TbCu 7 -type of structure. This structure derives from the CaCu 5 -type structure by random replacement of rare-earth atoms by transition metal atom pairs.…”

Effect of Nb and C additives on the microstructures and magnetic properties of rapidly solidified Sm–Co alloys

“…In Fe-rich SmCo 5 Fe x (x = 0, 1 and 2) melt-spun ribbons, produced by using a wheel speed of 25 m/s, the higher surface to volume ratio due to the smallest grain size in x = 2 ribbons exhibited enhanced remanence due to improved inter-grain exchange coupling [13]. Higher magnetic properties (coercivity as high as 38.5 kOe) were reported for melt-spun Sm(Co 0.74−x Fe 0.1 Cu 0.12 Zr 0.04 B x ) 7.5 (x = 0.005-0.05) alloys [14]. Better magnetic properties were reported for the boron containing samples than the carbon containing samples in melt-spun Sm(CoFeCuZr) z M x (M = B or C) nanocomposite magnets due to the finer grain size (30-50 nm) of the former [15].…”