溶鉄中の珪素と酸素の平衡

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The equilibrium of silicon and oxygen dissolved in liquid iron was studied at temperatures of 1570℃, 1625℃ and 1680℃ respectively. Fe-Si alloys were melted in pure silica crucibles in the H_2-H_2O gas mixtures for 10∿20h. Silicon in liquid iron increased its activity coefficient even with a low-silicon concentration, while it reduced the activity coefficient of oxygen. The products of silicon and oxygen were nearly constant in the range of 0∿3.0% silicon. These data obtained were summarized as follows : 1. SiO_2(sat.)+2H_2=<Si>___-+2H_2O logK_1[=α_<Si>・(P_<H_2O>/P_<H_2>)^2]=-15, 640/T+4.85 ⊿F^°_1=71, 540-22.17T 2. SiO_2(sat.)=<Si>___-+<2O>___- logK_3[=α_<s1>・α^2_0]=-30, 720/T+11.76 ⊿F^0_3=140, 540-53.79T 3. The interaction parameter of silicon in liquid iron, e′_<Si> : e′_<Si>=∂logƒ′_<Si>/∂[%Si]=3.910/T-1.77 4. The effect of silicon on the activity coefficient of oxygen in liquid iron, e^<(Si)>_0 : e^<(Si)>_0=∂logƒ^<(Si)>_0/∂[%Si]=-0.137 5. The activity coefficient of silicon in liquid iron with a very low silicon concentration (in mole-fraction), γ^°_<Si> : logγ^°_<Si>=-5, 640/T+1.038
社団法人日本鉄鋼協会の論文
1959-12-01