溶融鉄およびニッケル中のハフニウムと酸素の平衡

概要

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The deoxidation equilibrium of hafnium in liquid iron and nickel has been measured at the temperature range from 1600℃ to 1750℃ 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, logK_<Hf(Fe)>(=α_<Hf>・α^2_O)=-35840/T+11.39 logK′_<Hf(Fe)>(=[%Hf][%O]^2)=logK_<Hf(Fe)>+5.85(2[%Hf]+11.1[%O]) (0.01∿0.1mass%Hf) Liquid nickel, logK_<Hf(Ni)>(=α_<Hf>・α^2_O)=-33800/T+8.40 logK′_<Hf(Ni)>(=[%Hf][%O]^2)=logK_<Hf(Ni)>+9.75(2[%Hf]+11.1[%O]) (0.002∿0.1mass%Hf) The activity coefficients of oxygen and hafnium in nickel-iron alloys based on pure liquid nickel are expressed by the following equation : logƒ^<Fe>_<O(Ni)>+1/2logƒ^<Fe>_<Hf(Ni)>=-0.025[%Fe] up to 10 mass pct of iron at temperatures between 1600℃ and 1650℃.
社団法人日本鉄鋼協会の論文
1992-09-01