由空间流体流动刺激的树突和幼虫生长模式的动态定位效应
Hui Liao1, Haipeng Wang1, Dingnan Liu1
1School of Physical Science and Technology, Northwestern Polytechnical University, Xi'an, 710072, China.
Advanced materials (Deerfield Beach, Fla.)
|August 13, 2025
概括
在中国空间站的固化实验中,太空流体的流动揭示了新型的欧体和树突体生长模式. 微重力条件使得可控晶体生长和现场空间制造成为可能.
科学领域:
- 材料科学 材料科学 材料科学
- 固化物理 固化物理
- 太空科学 太空科学
背景情况:
- 传统的固化理论预测在可以忽略不计的体积效应下,固定的体形态和抛物线状树突尖端.
- 地球重力诱导的对流会在固化过程中破坏有序相位分离.
- 微重力提供了一个独特的环境来研究基本的固化过程.
研究的目的:
- 为了研究空间流体流动对eutectic和dendritic生长模式的影响.
- 了解驱动微重力下的凝固形态中的转换机制.
- 探索太空制造和受控晶体生长中的应用.
主要方法:
- 在中国空间站上进行的实验.
- 在微重力条件下观察欧体和树突体生长动态.
- 溶解物热合和马兰戈尼对流效应的分析.
主要成果:
- 空间流体流局部化溶解物-热合,诱导虫状,状和面状体生长模式之间的过渡.
- 马兰戈尼对流在大型低冷却处导致非抛物线式树突型尖端形态 (圆顶形,手指形,针形).
- 观察到有序地分离了欧特克和树突区,受局部温度和度场所支配,与地球重力不同.
结论:
- 由空间流体流动驱动的微重力条件显著改变了固化动态,导致了新的生长模式.
- 这些发现挑战了传统的固化理论,并强调了流体流在相变中的重要性.
- 这项研究对现场资源利用和在太空中制造先进材料有影响.
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