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Theoretical study of production of unique glasses in space. [kinetic relationships describing nucleation and crystallization phenomena
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Larsen, D. C. Sievert, J. L. |
| Copyright Year | 1975 |
| Description | The potential of producing the glassy form of selected materials in the weightless, containerless nature of space processing is examined through the development of kinetic relationships describing nucleation and crystallization phenomena. Transformation kinetics are applied to a well-characterized system (SiO2), an excellent glass former (B2O3), and a poor glass former (Al2O3) by conventional earth processing methods. Viscosity and entropy of fusion are shown to be the primary materials parameters controlling the glass forming tendency. For multicomponent systems diffusion-controlled kinetics and heterogeneous nucleation effects are considered. An analytical empirical approach is used to analyze the mullite system. Results are consistent with experimentally observed data and indicate the promise of mullite as a future space processing candidate. |
| File Size | 4067665 |
| Page Count | 106 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19750025053 |
| Archival Resource Key | ark:/13960/t1zd2q03s |
| Language | English |
| Publisher Date | 1975-05-23 |
| Access Restriction | Open |
| Subject Keyword | Astronautics (general) Space Manufacturing Containerless Melts Microgravity Applications Nucleation Space Commercialization Crystallization Glass Kinetics Weightlessness Prediction Analysis Techniques Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
