The
Nd-Fe-B
Ribbons of 0.1-0.4 mm thick were fabricated by using
single roll melt spinning in replace of the traditional casting method. The relationship among the technological parameters, the thickness of ribbons and the
microstructure is obtained. In order to fabricate the Nd-Fe-B ribbons of 0.25-0.35 mm thick, the optimum technological parameters should be controlled in the following range. The rolling velocity is about 10m/s, the jet pressure is 0.08-0.10 MPa, and the gap between the roll and the nozzle is (2±0.5) mm. The microstructure of the ribbon of 0.3 mm thick is mainly composed of lamellar Nd2Fe14B phase, which grows in the
preferred orientation of <410>, and the spacing between the Nd-rich phases is 5 nm. For the ribbon of 0.4mm thick, the amount of α-Fe is obviously higher than that of Nd2Fe14B, and the preferred orientation is <008>. The microstructure of the ribbon of 0.1 mm thick is composed of fine
equiaxed grains, but that of the
Ribbon of 0.4mm thick, of thick equiaxed grains.
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