The behavior of a metallic dispersion under microgravity conditions

Statistics – Applications

Scientific paper

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Dispersing, Gallium Compounds, Mercury Compounds, Metal Matrix Composites, Reduced Gravity, Space Shuttle Mission 31-C, Spaceborne Experiments, Drops (Liquids), Gaps, Homogenizing, Isothermal Processes, Marangoni Convection, Microgravity Applications, Miscibility Gap, Nucleation, Photographic Recording, Solubility, Space Commercialization

Scientific paper

An STS 7 experiment in which a gallium-mercury system with a liquid state miscibility gap is used to study dispersion under microgravity is described. The sample is not solidified, but cooled into the miscibility gap only. The resulting liquid-liquid dispersion and its development upon further cooling are recorded by X-ray transmission photography. Three different cooling rates are used with the same sample. The influence of time and gradient dependent effects (homogenization, droplet growth, Marangoni convection, Stokes' sedimentation) on the stability of the dispersion are considered.

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