Features of the control of solidification structure using directional crystallization with superimposed vibration exposure under weightlessness conditions

1Demchenko, VF, 2Fedorov, OP
1Space Research Institute of the National Academy of Science of Ukraine and the State Space Agency of Ukraine, Kyiv, Ukraine
2Space Research Institute of the National Academy of Sciences of Ukraine and the State Space Agency of Ukraine, Kyiv, Ukraine
Kosm. nauka tehnol. 2015, 21 ;(2):73–80
https://doi.org/10.15407/knit2015.02.073
Section: Space Material Science
Publication Language: Ukrainian
Abstract: 

For the purpose of preparing a space experiment, we accomplished a mathematical simulation of the hydrodynamic and thermal processes during crystal growing by the Bridgeman and the floating zone techniques under terrestrial and microgravity conditions was held. The features of the hydrodynamic state of the melt when exposed to axial vibration of different frequencies and intensities were studied. It is shown that the suppression of non-stationary contours of melt flow before the crystallization front is possible in both methods, but the floating zone method is less sensitive to Rayleigh-Taylor instability of liquid phase flow under weightlessness conditions

Keywords: Bridgman technique, floating zone technique, melt flow, microgravity, сrystallization
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