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Fabrication of highly dense isotropic Nd-Fe-B nylon bonded magnets via extrusion-based additive manufacturing

2018; Elsevier BV; Volume: 21; Linguagem: Inglês

10.1016/j.addma.2018.04.001

2214-8604

Ling Li, Kodey Jones, B. C. Sales, Jason Pries, Ikenna C. Nlebedim, Ke Jin, Hongbin Bei, Brian Post, Michael S. Kesler, Orlando Rios, Vlastimil Kunc, Robert Fredette, John G. Ormerod, Aaron Williams, T. A. Lograsso, M. Paranthaman,

Magnetic and transport properties of perovskites and related materials

Magnetically isotropic bonded magnets with a high loading fraction of 70 vol.% Nd-Fe-B are fabricated via an extrusion-based additive manufacturing, or 3D printing system that enables rapid production of large parts. The density of the printed magnet is ∼ 5.2 g/cm3. The room temperature magnetic properties are: intrinsic coercivity Hci = 8.9 kOe (708.2 kA/m), remanence Br = 5.8 kG (0.58 T), and energy product (BH)max = 7.3 MGOe (58.1 kJ/m3). The as-printed magnets are then coated with two types of polymers, both of which improve the thermal stability as revealed by flux aging loss measurements. Tensile tests performed at 25 °C and 100 °C show that the ultimate tensile stress (UTS) increases with increasing loading fraction of the magnet powder, and decreases with increasing temperature. AC magnetic susceptibility and resistivity measurements show that the 3D printed Nd-Fe-B bonded magnets exhibit extremely low eddy current loss and high resistivity. Finally, we demonstrate the performance of the 3D printed magnets in a DC motor configuration via back electromotive force measurements.