The effect of water temperature on the shape, cooling characteristics and non-crystallinity of FeSi
7.5B
15 (at%) wires produced by the In-Rotating-Water Spinning Method was examined experimentally. The nozzle diameter was 0.25 mm and the incidence angle of molten metal jet to the water surface was 60°. The drum rotational velocity
vd ranged from 5.8 to 8.5 m/s and the jet velocity
vj from 5.9 to 9.5 m/s. The water temperature
Tw was set at 283, 303 and 323 K. The wire produced at
Tw≈283 K showed a smooth surface. At
Tw≈303 K, a structure like a string of beads appeared partly on the wire surface. At
Tw≈323 K, the wire looked like a string of beads. A straight wire was obtained for
vj⁄
vd≤ 1. The wire became meanderous with increasing
vj⁄
vd for
vj⁄
vd>1. The jet temperature decreased almost linearly with the distance from the point of incidence and it’s value was higher for higher
vj. The average cooling rate of the wire in the temperature range of 1470 to 1200 K was lower for higher
Tw. It decreased gradually with decreasing
vd and increasing
vj. For a constant
Tw, the heat of crystallization
ΔH, which is a parameter expressing the degree of non-crystallinity of the wire, was uniquely dependent on the
vj⁄
vd ratio. For 0.7<
vj⁄
vd<0.97,
ΔH showed a high value which was almost independent of
Tw. For 0.97<
vj⁄
vd,
ΔH decreased with increasing
vj⁄
vd and the decrease was more significant for higher
Tw. However, a definite correlation was not observed between the measured cooling rate and
ΔH. Discussion was made of the factors that affected the non-crystallinity of the wire.
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