Phase equilibria in aluminum-carbon system at high temperatures
| Autor: | N. A. Gokcen, L. L. Oden |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
Phase boundary
Materials science Vapor pressure General Chemical Engineering Enthalpy of fusion Metals and Alloys chemistry.chemical_element Thermodynamics Condensed Matter Physics Gibbs free energy Condensed Matter::Materials Science symbols.namesake chemistry Phase (matter) Physics::Atomic and Molecular Clusters Materials Chemistry symbols Melting point General Materials Science Graphite Physical and Theoretical Chemistry Carbon Phase diagram |
| Zdroj: | Journal of Phase Equilibria. 19:409-411 |
| ISSN: | 1863-7345 1054-9714 |
| DOI: | 10.1361/105497198770336398 |
| Popis: | The partial excess Gibbs energies of carbon and aluminum in liquid Al-C were used with the equilibrium vapor pressures of pure Al and pure C to obtain the phase diagrams (1) at I bar of total pressure, and (2) at pressures sufficient to suppress the gas phase. The first diagram contains [gas+graphite → liquid] tectoid-type reaction at 2900±20 K with the tectoid composition of 0.681 mol fraction of aluminum. The [gas/graphite] boundary is subject to large errors due to the large errors in the vapor pressure of pure graphite, but its general form is acceptable. The second diagram consists entirely of the condensed phases with peritectic reaction [liquid+graphite → Al 4 C 3 ] at 2429 K. The [liquid/graphite] phase boundary was obtained from the graphite solubility in liquid solutions at 2429-2800 K, yielding the partial excess Gibbs energy of carbon in solution. The resulting phase boundary is as reliable as the melting point of graphite, taken to be 4130 K. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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