The deoxidation equilibrium of aluminum in liquid nickel saturated with solid alumina has been measured at the temperature ranging from 1823 K to 1973 K using the sampling technique with a view to understanding the equilibrium between aluminum and oxygen in liquid nickel.
The temperature dependence of the equilibrium constant for the deoxidation reaction was presented to be :
log K_Al(Ni)(=log a²_Al·a³_o/a_Al2O3)=-28770/T+1.67 18231973 K
while the deoxidation product, log K'_Al(Ni)(=log[%Al]² [%0]³), was expressed as follows :
log K'_Al(Ni)=log K_Al(Ni) + 1.47(3[%Al]+3.4[%0]) Al<1.1 mass %, 18231973 K
The deoxidation of liquid nickel-iron binary alloys with aluminum was measured up to 50 mass pct iron. The activity coefficients of aluminum and oxygen in nickel-iron alloys based on pure liquid nickel were estimated by the following equation :
log f^Fe_O(Ni)+2/3log f^Fe_Al(Ni) =-0.028[%Fe]
up to around 10 mass pct iron at 1923 K.