Abstract
The solubility of oxygen in niobium-bearing iron-nickel melts is studied experimentally, for the example of Fe-40% Ni alloy at 1823 K. Niobium reduces the solubility of oxygen in this melt. Values are determined for the equilibrium constant of the reaction between niobium and oxygen dissolved in the given melt (logK(1)(Fe-40% Ni) = −4.619), the Gibbs energy (ΔG(1)(Fe-40%Ni)o = 161210 J/mol), and the interaction parameters (eNb(Fe-40% Ni)O = −0.630; eO(Fe-40% Ni)Nb = −0.105; eNb(Fe-40% Ni)Nb = 0.010). Over a wide range of concentrations, the Gibbs energy of the reaction between niobium and oxygen dissolved in Fe-Ni melts, the equilibrium constants, and the interaction parameters at 1823 K are determined. The solubility of oxygen in Fe-Ni melts of different composition containing niobium is determined at 1823 K. With increase in nickel content in the Fe-Ni melts, the oxygen affinity of niobium increases significantly, on account of the decrease in oxygen binding forces with increase in nickel content in the melt (γO(Fe)∘ = 0.0084, γO(Ni)∘ = 0.297).
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