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首页> 外文OA文献 >Observation of an Aligned Gas - Solid 'Eutectic' during Controlled Directional Solidification Aboard the International Space Station - Comparison with Ground-based Studies
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Observation of an Aligned Gas - Solid 'Eutectic' during Controlled Directional Solidification Aboard the International Space Station - Comparison with Ground-based Studies

机译：在国际空间站上进行定向定向凝固过程中观察到的对准气-固“共晶”-与地面研究的比较

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Direct observation of the controlled melting and solidification of succinonitrile was conducted in the glovebox facility of the International Space Station (ISS). The experimental samples were prepared on ground by filling glass tubes, 1 cm ID and approximately 30 cm in length, with pure succinonitrile (SCN) in an atmosphere of nitrogen at 450 millibar pressure for eventual processing in the Pore Formation and Mobility Investigation (PFMI) apparatus in the glovebox facility (GBX) on board the ISS. Real time visualization during controlled directional melt back of the sample showed nitrogen bubbles emerging from the interface and moving through the liquid up the imposed temperature gradient. Over a period of time these bubbles disappear by dissolving into the melt. Translation is stopped after melting back of about 9 cm of the sample, with an equilibrium solid-liquid interface established. During controlled re-solidification, aligned tubes of gas were seen growing perpendicular to the planar solid/liquid interface, inferring that the nitrogen previously dissolved into the liquid SCN was now coming out at the solid/liquid interface and forming the little studied liquid = solid + gas eutectic-type reaction. The observed structure is evaluated in terms of spacing dimensions, interface undercooling, and mechanisms for spacing adjustments. Finally, the significance of processing in a microgravity environment is ascertained in view of ground-based results.
机译：在国际空间站（ISS）的手套箱设施中直接观察到丁二腈的受控熔化和固化。实验样品是通过在氮气气氛中以450毫巴压力在纯净的丁二腈（SCN）中填充1cm内径和长约30cm的玻璃管在地面上制备的，最终用于孔形成和流动性调查（PFMI）中ISS上的手套箱设施（GBX）中的器械。样品在定向回熔过程中的实时可视化显示，氮气气泡从界面冒出，并在液体中沿施加的温度梯度向上移动。在一段时间内，这些气泡会溶解到熔体中而消失。融化约9厘米的样品后，停止翻译，并建立了平衡的固液界面。在受控的重新凝固过程中，观察到垂直于平面的固/液界面垂直排列的气体管，这表明先前溶解到液体SCN中的氮现在从固/液界面中出来，形成了很少研究的液体=固体+气体共晶型反应。根据间距尺寸，界面过冷和间距调整机制评估观察到的结构。最后，考虑到基于地面的结果，确定了在微重力环境中进行处理的重要性。

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