Deoxidation Equilibrium of Titanium in the Iron–Nickel Melts

Abstract

The oxygen solutions in the titanium-containing Fe-Ni melts have been thermodynamically analyzed. When the nickel content rises to 40 %, the deoxidation ability of titanium decreases but then it sharply rises with increasing nickel concentration in melt. This can be explained by the fact that although the bond strength of titanium in nickel is considerably stronger in comparison with iron (g°T i(s)(Fe) ϭ0.0083; g°T i(s)(Ni) ϭ0.00019), but the bond strength of oxygen in nickel is appreciably weaker that in iron (g°O (Fe) ϭ0.0105; g°O (Ni) ϭ0.357). The oxygen solubility curves pass through a minimum whose position shifts to the higher titanium concentrations with an increase in the nickel content from 0.564 % Ti for pure iron to 0.633 % Ti for pure nickel. The further addition of titanium causes an increase in the oxygen content in melt. Equilibrium points of oxide phases TiO 2 , Ti 3 O 5 and Ti 2 O 3 for different alloy compositions at 1 873 K were determined. The published results devoted to the oxide phases in iron and nickel deoxidized with titanium are summarized. Deoxidation of Fe-40%Ni melts with titanium was experimentally studied. The experimental and calculated results are in good agreement. The deoxidation abilities of titanium, chromium, manganese, vanadium, silicon, carbon, and aluminum in different Fe-Ni alloys are compared.

Solubility of oxygen in zirconium-containing iron-nickel melts

“…3 in comparison with similar data on the dependence of oxygen solubility in this melt on content of chromium [11], manganese [12], vanadium [13], silicon [12], carbon [14], titanium [15], and alu minum [16]. It can be seen that aluminum possesses the highest oxidizing ability among the studied ele ments; zirconium also shows fairly high oxidizing abil ity.…”

Composition evolution and coalescence behavior of titanium oxide particles in Iron-Nickel binary alloy melt

“…Different phases can be precipitated using different titanium amount [16] in the Fe-Ni deoxidation. Suzuki et al [17] reported that the FeO solubility in the TiO 2 phase is much higher than that in the Ti 3 O 5 phase.…”

“…A simplified model to evaluate the capillary force can be expressed as Eq. (16). The details of the equations deviation can be found elsewhere [52,53].…”

“…As a typical example, different oxide phases can be precipitated with different amount of the titanium addition. A large number of works have been reported [16][17][18][19][20][21] to describe the equilibrium reactions in the Fe-Ti-O system. However, a detailed study of the TiO x inclusion behavior with different amount of the titanium addition is not available in the open literature.…”

Thermodynamics of Oxygen Solutions in the Nickel Melts Containing Aluminum and Titanium

“…Равновесные концентрации алюминия и кислорода в расплавах никеля при 1873 К, % -1,535 [9] 0,036 [9] -0,355 [14] Для расплавов никеля, содержащих титан и кислород, величина параметра может быть использована до содержания титана 5 % [9].…”