Thermodynamic behavior of dissolved oxygen and hydrogen in pure vanadium
The mechanism governing the deoxidation of vanadium metal is regarded as fundamental knowledge; however, it has not been elucidated in existing literature. In this paper, the thermodynamic data of V-H-O systems were summarized, and the Gibbs free energies of the main compounds were calcu...
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| Autores principales: | , , , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
Technical Faculty, Bor
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/86791e7ff47843e8b8c1405b56604916 |
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| Sumario: | The mechanism governing the deoxidation of vanadium metal is regarded as
fundamental knowledge; however, it has not been elucidated in existing
literature. In this paper, the thermodynamic data of V-H-O systems were
summarized, and the Gibbs free energies of the main compounds were
calculated. Consequently, the deoxidation limits of different reductants in
a V-O system were evaluated, namely: Si, Al, and Mg. It was observed that Si
cannot remove an O content of less than 7.27 wt% from V. However, Al was the
stronger reducing agent; it could remove O contents of up to 0.01 and 0.1
wt% at 800 and 1050 °C, respectively. Nevertheless, Mg exhibited the best
reducing properties as it could remove less than 0.01 wt% of O at 1100 °C.
The addition of H2 renders the V-O solid solution unstable to a certain
extent, thereby indicating that H2 facilitates deoxygenation. Furthermore,
the results obtained by analyzing the equilibrium conditions were in
accordance with the results of the deoxidation limit in the V-O system. In
other words, this study demonstrates that the oxygen in vanadium can be
effectively controlled by changing the reductant dosage and temperature. |
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