Effect of water temperature on the non-crystallinity of FeSi7.5B15 (at%) wires produced by the in-rotating-water spinning method

Kyu Sang Cho, Hiroshi Takamatsu, Hiroshi Honda

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2 Citations (Scopus)

Abstract

The effect of water temperature on the shape, cooling characteristics and non-crystallinity of FeSi7.5B15 (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 vjlvd>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<vd/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.

Original languageEnglish
Pages (from-to)1157-1162
Number of pages6
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume62
Issue number12
DOIs
Publication statusPublished - 1998

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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