Magnetic Properties of Melt Spun Mischmetals-Fe-Ti-B Nanocomposite Ribbons

Abstract

Magnetic properties and phase evolution of melt spun R9.5Fe(bal.)Ti2B10 (R = MM(A), MM(B), MM(C), Pr, Nd, Ce, and La) nanocomposites have been investigated. Based on the results for the X-ray diffraction and thermal magnetic analysis, only 2:14:1 and alpha-Fe phases appear for R = MM(A) and Pr, and an additional Fe3B phase is present for R = MM(B), MM(C), Nd, and Ce. Besides, the uniform fine grain size of 20-40 nm is almost unchanged for the ribbons with various rare earth elements. Accordingly, magnetic properties of MM9.5Fe(bal.)Ti2B10 nanocomposites are mainly dominated by the composition of Mischmetals or the rare earth elements adopted, and are consistent with the outcome for the combinations of magnetic properties of their corresponding R9.5Fe(bal.)Ti2B10 nanocomposites. In this study, the optimum magnetic properties of B(r) = 9.3 kG, (i)H(c) = 12.1 kOe and (BH)(max) = 18.0 MGOe can be achieved for MM(B)9.5Fe(bal.)Ti2B10 nanocomposites. They not only exhibit comparable magnetic properties to the commercial available powders but also reduce the original material cost effectively.

Effect of Nonmagnetic Hf Addition on Magnetic Properties of Melt-Spun Misch Metal-Fe-B Ribbons

“…Hence, the elimination of the separation and purification of rare earth processes, which cause environmental pollution, results in a significant reduction in the cost and waste [13][14][15][16]. However, the total replacement of Nd with MM leads to the degradation of the magnetic properties [17], e.g., the Curie temperature (Tc) decreases by 30%, and there is also a significant decrease in saturation magnetization (Ms) and hence energy product [17,18]. Current approaches are limited to replacing Nd with MM without providing further solutions to improve Curie temperature and increase saturation magnetization [19].…”

Abnormal variation of magnetic properties with Ce content in (PrNdCe) 2 Fe 14 B sintered magnets prepared by dual alloy method

“…[1][2][3] However, their mass production and wide application give rise to the unbalanced use of rare earth and the backlog of Ce. [4][5][6][7][8][9][10][11] Ce ion is in a strongly mixed-valent α-like state rather than the trivalent γ state, so it is nonmagnetic and the magnetocrystalline anisotropy is low in Ce 2 Fe 14 B. [12,13] Furthermore, the phase diagram and phase constitution of Ce-Fe-B are different from those of Nd-Fe-B, [14,15] and the minor phases possibly lead to a large variation of magnetic properties.…”