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Directional solidification of rod eutectics in NaNO₃-NaCl system

  • Journal of the Korean Crystal Growth and Crystal Technology
  • Abbr : J. Korean Cryst. Growth Cryst. Technol.
  • 2008, 18(3), pp.122-124
  • Publisher : The Korea Association Of Crystal Growth, Inc.
  • Research Area : Engineering > Materials Science and Engineering

Shinwoo Kim 1 R.N.Grugel 2

1호서대학교
2MSFC, Materials and Processes Laboratory

Accredited

ABSTRACT

The partial phase diagram of NaNO3-NaCl system was investigated and the eutectic temperature was determined as 294.5oC. A typical rod eutectics of NaNO3-4.56 wt%NaCl was directionally solidified. The results of interrod spacing, λE, as a function of growth velocity, V, were obtained as λE V 0.39= 5.26 (temperature gradient, Gl = 21.4℃/mm) and λEV0.32= 5.45 (Gl = 3.9℃/mm) and the exponent numbers of growth velocity were smaller than the theoretical value, 1/2. The sample rotation applied during directional solidification made the interrod spacing decrease slightly.

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