Abstract
Nd-Fe-B magnetic rings have been fabricated using a hot pressing and composite-extrusion technology. The influences and mechanism of processing on microstructures, structures and magnetic properties of the magnetic rings are analyzed. The results show that the I(006)/I(105), Br and (BH)max of the samples increase firstly and then decrease as hot-pressing time and extrusion speeds increase. The FE part hot-pressed for 240 s obtained the highest (BH)max. The magnetic properties of the samples decrease initially and then fluctuate as the extrusion temperature increase. The highest Br, Hcj and (BH)max of the samples are achieved hot-pressed at 550 oC for 240 s extruded at 700 oC using extrusion speed of 0.15 mm/s, 13.37 kGs, 13,68 kOe and 40.94 MGOe, respectively.
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