溶鉄中の炭素と酸素の活量について

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The equilibrium of CO-CO_2 gas mixture with carbon and oxygen dissolved in liquid iron was studied in the range from a dilute solution to a concentration with 2.5% carbon at 1460, 1560, 1660 and 1760℃ The results obtained gave the following equations : C__-+CO_2=2CO……(1) logK_1(=P_<CO>^2/P_<CO>_2・α_C)=-7, 558/T+6.765 ⊿F^°_1=34, 580-30.95T O__-+CO=CO_2……(2) logK_2(=P_<CO>_2/P_<CO>α_O)=8, 718/T-4.762 ⊿F^°_2=-39, 880+21.78T C__-+O__-=CO……(3) logK_3(=Pco/α_C・α_O)=1, 160/T+2.00 ⊿F^°_3=-5, 310-9.16T The relationship between the activity coefficient of carbon or oxygen and the concentration of carbon was expressed by the following equations, where the mole fration of carbon was below 0.09Nc : logγ^(C)_C=6.40Nc……<0.09Nc logf^(C)_O=-9.05Nc……<0.09Nc From these results activity coefficient of carbon in liquid iron was evaluated over the whole range of carbon of the Fe-C alloy.
社団法人日本鉄鋼協会の論文
1962-07-01