| Autor: |
D. D. Elleman, R. J. Naumann |
| Rok vydání: |
1986 |
| Předmět: |
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| Zdroj: |
Materials Sciences in Space ISBN: 9783642827631 |
| DOI: |
10.1007/978-3-642-82761-7_12 |
| Popis: |
The virtual absence of hydrostatic pressure in a microgravity environment allows liquids to be confined solely by their surface tension and offers the possibility of melting and solidifying materials without physical contact. This “containerless processing” eliminates contaminants that may be introduced by the container or crucible and may be used to obtain ultrapure materials. This is especially important for systems that are highly corrosive in the melt. Elimination of container-induced nucleation also permits melts to be deeply undercooled before solidification. This offers the possibility of studying homogeneous nucleation and solidification in undercooled melts. Such solidification can be extremely rapid and may produce unique microstructures including metastable or amorphous phases in metals. The range of glass formation may be extended in borderline glass forming systems, which may result in new glasses with unusual properties. Since such glasses are formed from melts confined only by surface tension, they will have perfectly spherical pristine surfaces, undamaged by grinding or other shaping processes. It may also be possible to manipulate the melt to form aspherical shapes, or to draw optical fibers from a containerless melt. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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