Oxygen solubility in boron-containing Ni – Co melts
https://doi.org/10.17073/0368-0797-2020-9-721-729
Abstract
Alloys of the Ni – Co system are widely used in industry. B ron is one of the alloying components in these alloys. The study of thermodynamics of the oxygen solution in boron-containing Ni – Co melts is of considerable interest for the practice of such alloys production. Thermodynamic analysis of oxygen solutions in boron-containing Ni – Co melts has been carried out. The equilibrium constant of interaction of boron and oxygen dissolved in the nickel-cobalt melts, the activity coefficients at infinite dilution, and the interaction parameters characterizing these solutions were determined for melts of different composition at 1873 K. During interaction of boron with oxygen in Ni – Co melts, the oxide phase, in addition to B2O3, contains NiO and CoO. The values of the mole fractions of B2O3, NiO and CoO in the oxide phase for different boron concentrations in Ni – Co melts were calculated at 1873 K. In the case of nickel melt at boron contents above 0.01 %, the mole fraction of boron oxide is close to unity. As the cobalt content in the melts increases to 20 %, the mole fraction of boron oxide in the oxide phase decreases, and then practically does not change. Dependences of the oxygen solubility on the contents of cobalt and boron in the studied melts were calculated. The deoxidation ability of boron decreases slightly with increasing cobalt content up to 20 %, and then increases with increasing cobalt content in the melt. Boron contents in minimum points on the oxygen solubility curves and the corresponding minimum oxygen concentrations were determined.
Keywords
nickel-cobalt melts,
oxygen,
boron,
thermodynamic analysis,
oxide phase,
mole fraction,
interaction parameters,
solubility
Supporting agencies: The work was performed in accordance with the state assignment No. 075-00947-20-00.
About the Authors
A. A. Aleksandrov
Baikov Institute of Metallurgy and Materials Science, RAS
Russian Federation
Russian Federation
Cand. Sci. (Eng.), Senior Researcher
Moscow
V. Ya. Dashevskii
Baikov Institute of Metallurgy and Materials Science, RAS
Russian Federation
Russian Federation
Dr. Sci. (Eng.), Professor of the Chair “Energy-Efficient and Resource-Saving Industrial Technologies”, Head of the Laboratory
Moscow
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For citations:
Aleksandrov A.A., Dashevskii V.Ya. Oxygen solubility in boron-containing Ni – Co melts. Izvestiya. Ferrous Metallurgy. 2020;63(9):721-729. (In Russ.) https://doi.org/10.17073/0368-0797-2020-9-721-729
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