Nb-added high-coercivity Nd-Fe-B melt-spun ribbon with high remanence

Abstract

The effects of composition and additives on the microstructures and magnetic properties of Nd-Fe-B melt-spun ribbons were studied. Experimental results have revealed that homogeneous grain structure with fine grain size was obtained on composition close to 2-14-1 stoichiometry with additives. It was also found that Nb was very effective in increasing both remanence and coercivity in a Nd-Fe-B melt-spun ribbon. A high-energy product of 151.2 kJ/m3 (19.0 MGOe) was obtained from an isotropic (Nd0.5Pr0.5)12Fe72Co8B6Nb2 melt-spun ribbon with a remanence of 0.926 T and a coercivity exceeding 1200 kA/m (∼15 kOe).

Phase evolution, magnetic properties, and coercivity mechanism of melt-spun Pr2Fe14(C, B)/α-Fe-type ribbons

“…To date, a large amount of work has been done on optimizing the microstructure of Nd 2 Fe 14 B/a-Fe-type nanocomposites and improving their magnetic properties [5][6][7][8][9][10][11]. However, because the microstructures of most samples do not satisfy the requirements of theoretical models, the (BH) max values of nanocomposites obtained are still well below the theoretical predictions (50 MGOe).…”

Generation and Characterization of Anisotropic Microstructures in Rare Earth-Iron-Boron Alloys

“…The precipitates reported were hexagonal ternary Nb-Fe-B compounds that were identified as being coherent with the matrix. It was observed that coercivity was slightly enhanced with the presence of these precipitates [118,119], and was surmised that the precipitates acted as magnetic domain wall pinning sites. Lorentz force microscopy indicated that the domain walls did, indeed, interact with the precipitates.…”