Directional solidification of rod eutectics in NaNO₃-NaCl system
2
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
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.
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.
참고문헌 (8)
- F. Guthrie, "Eutectic salt alloys and metal alloys", Phil. Mag, 17, pp.462~ (1884)
- K.A. Jackson, "Lamellar and rod eutectic growth", Trans. AIME, 236, pp.1129~ (1966)
- "Phase Diagrams for Ceramist", Fig, 1-11, pp.98~
- R.G. Pirich, "Influence of gravity driven convection on the directional solidification of Bi", MnBi eutectic composites, 1982, pp.9, 523~
- H. Jacobi, "Dendrite morphology of steady state unidirectionally solidified steel", Metall. Trans, 7, pp.811~ (1976)
- R. Trivedi, "Eutectic spacing selection in lead-based alloy systems", Metall. Trans, 22, pp.2523~ (1991)
- R.N. Grugel, "Evaluation of the rodlike Cu6Sn5 phase in directionally solidified Tin-0.9 wt% copper eutectic alloys", Materials Characterization, 38, pp.211~ (1997)
- R. Caram, "Influence of convection on rod spacing of eutectics", J. of Crystal Growth, 106, pp.294~ (1990)