Papers by Keyword: Drop Tube

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Authors: M. Meier, O. Hinrichs, H.J. Rath
95
Authors: Rafael Cardoso Toledo, F.E. de Freitas, Chen Y. An, I.N. Bandeira
Abstract: Containerless solidification of 300 to 850 µm diameter droplets of PbSn eutectic alloy was achieved by using a 3m length drop tube, which is one of the most suitable and low cost option to provide a microgravity environment on the ground. Phase morphology and composition were investigated, respectively, by scanning electron microscopy (SEM) and energy dispersive spectrometry (EDS). It was found that the microstructure of the droplets depends on their sizes, where in larger diameters (>500µm) consists of both regular lamellar and irregular structures, and on other hand, for the smaller ones (<500µm) the structure is only irregular with higher lead concentration.
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Authors: Bing Chen Wei, Wei Hua Wang, G.S. Yu, W.H. Li, Y.F. Sun, Yu Ren Wang
685
Authors: Rafael Cardoso Toledo, M.B. Mattos, Chen Y. An, I.N. Bandeira
Abstract: Containerless solidification of Bi32.5In51Sn16.5 eutectic alloy under microgravity conditions was investigated by using a 3 m length drop tube. The Bi-In-Sn system is an important material for lead-free solder and fuse element for electrical protection. It has a low eutectic melting temperature of 60°C, which is suitable for experiments in restricted environments like the International Space Station (ISS), where the security requirements are very strict. Droplets, with diameters in the range of 200 to 400 m, solidified under microgravity, were obtained consistently with irregular ternary eutectic structure, whereas, previous results under normal gravity presented both regular lamellar and irregular structures.
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