THERMODYNAMICS OF OXYGEN SOLUTIONS IN THE Fe – Ni, Fe – Co AND Ni – Co MELTS
https://doi.org/10.17073/0368-0797-2015-1-54-60
Abstract
Thermodynamic analysis of oxygen solutions in the Fe – Ni – O, Fe – Co – O, Co – Ni – O melts was determined. Composition of the oxide phase and the value of the equilibrium oxygen concentration in the melt of those systems were fi rst time obtained in a whole range of alloy compositions. In Fe – Ni – O and Fe – Co – O systems with increasing content of nickel and cobalt in the melts the oxide phase contains mainly FeO in a suffi ciently wide range of content of nickel and cobalt. Only when the mole fraction of nickel is close to unity and the mole fraction of cobalt is more than 0.8, content of NiO and CoO increases sharply. Oxide phase of Co – Ni – O system contains CoO and NiO in
the entire range of alloy compositions. In the Fe – Ni and Fe – Co systems nickel and cobalt additives in the melt lead to decreased solubility of oxygen due to the attenuation, both nickel and cobalt, oxygen bonds in the melt and thus increases its activity. Further, by increasing the content of nickel and cobalt, the oxygen concentration in the melt increases slowly at fi rst and then quite rapidly. In Co – Ni system nickel additives to cobalt lead to increasing solubility of oxygen in the whole range of alloy compositions due to a substantially greater solubility of oxygen in nickel than in cobalt.
Supporting agencies: RFBR
About the Authors
V. Ya. Dashevskii
Institute of Metallurgy and Material Science named after Baikov A.A., RAS
Russian Federation
Dr. Sci. (Eng.), Head of the Laboratory
Russian Federation
Dr. Sci. (Eng.), Head of the Laboratory
A. A. Aleksandrov
Institute of Metallurgy and Material Science named after Baikov A.A., RAS
Russian Federation
Russian Federation
Cand. Sci. (Eng.), Senior Researcher
L. I. Leont’ev
Institute of Metallurgy and Material Science named after Baikov A.A., RAS
Russian Federation
Russian Federation
RAS Academician, Chief Researcher
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Review
For citations:
Dashevskii V.Ya., Aleksandrov A.A., Leont’ev L.I. THERMODYNAMICS OF OXYGEN SOLUTIONS IN THE Fe – Ni, Fe – Co AND Ni – Co MELTS. Izvestiya. Ferrous Metallurgy. 2015;58(1):54-60. (In Russ.) https://doi.org/10.17073/0368-0797-2015-1-54-60
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