Nawer Jannatun, Stanford Brian, Kolbe Matthias, Schneider Stephan, Gossé Stéphane, Wunderlich Rainer K, Mohr Markus, Borzì Aurelio, Neels Antonia, Matson Douglas M
Department of Mechanical Engineering, Tufts University, Medford, MA, USA.
Institut für Materialphysik im Weltraum, Deutsches Zentrum für Luft- und Raumfahrt (DLR), Köln, Germany.
NPJ Microgravity. 2024 Jul 19;10(1):77. doi: 10.1038/s41526-024-00416-1.
Evaporation control is a critical facility resource during solidification experiments that limits processing time and must be tracked to ensure facility health. A thermodynamic analysis was performed on a ternary FeCrNi sample processed onboard the International Space Station (ISS) using ESA Electromagnetic Levitation (EML) facility in a microgravity environment. A non-ideal solution-based mathematical model was applied for the overall sample mass loss prediction during this study. The overall sample mass loss prediction is consistent with the post-flight mass loss measurements. The species-specific findings from this study were validated using post-mission SEM-EDX surface evaluations by three different facilities. The bulk composition prediction was validated using SEM-EDX and wet chemical analysis. The non-ideal solution model was then applied to predict the composition of the dust generated during EML testing. The thicknesses of the deposited layer on the EML coil at various locations were also calculated using the geometry of the facility and results were validated with near-real-time dust layer predictions from toxicity tracking software developed by the German Space Center (DLR) Microgravity User Support Center (MUSC).
在凝固实验中，蒸发控制是一种关键的设施资源，它限制了处理时间，必须进行跟踪以确保设施正常运行。利用欧洲航天局（ESA）的电磁悬浮（EML）设施，在国际空间站（ISS）的微重力环境中对三元FeCrNi样品进行了热力学分析。在本研究中，应用了基于非理想溶液的数学模型来预测样品的总质量损失。样品的总质量损失预测与飞行后的质量损失测量结果一致。本研究中特定物种的研究结果通过三个不同设施的任务后扫描电子显微镜-能谱仪（SEM-EDX）表面评估得到验证。使用SEM-EDX和湿化学分析对整体成分预测进行了验证。然后应用非理想溶液模型来预测EML测试过程中产生的灰尘成分。还利用设施的几何形状计算了EML线圈不同位置处沉积层的厚度，并与德国航天中心（DLR）微重力用户支持中心（MUSC）开发的毒性跟踪软件的近实时灰尘层预测结果进行了验证。
