溶融鉄およびニッケル中のハフニウムと酸素の平衡
1992 年 78 巻 9 号 p. 1449-1455
詳細
1992 年 78 巻 9 号 p. 1449-1455
The deoxidation equilibrium of hafnium in liquid iron and nickel has been measured at the temperature range from 1600°C to 1750°C using hafnia crucibles with a view to understanding the equilibrium between hafnium and oxygen in iron and nickel.
The results obtained are summarized as follows:
Liquid iron, log KHf(Fe) ( = aHf·a2O) = - 35840/T + 11.39
log K'Hf(Fe) ( = [ %Hf] [ % O]2) = log KHf(Fe) + 5.85 (2[%Hf] + 11.1[%O]) (0.010.1 mass% Hf)
Liquid nickel, log KHf(Ni) (= aHf·a2O = - 33800/T + 8.40
log K'Hf(Ni) (= [%Hf][%O]2) = log KHf(Ni)) + 9.75(2[%Hf]+ 11.1[%O]) (0.0020.1mass% Hf)
The activity coefficients of oxygen and hafnium in nickel-iron alloys based on pure liquid nickel are expressed by the following equation:
logƒFeO(Ni) + 1/2 logƒFeHf(Ni) = -0.025[ %Fe]
up to 10 mass pct of iron at temperatures between 1600°C and 1650°C.
