溶鉄中の炭素と酸素の活量について
1962 年 48 巻 8 号 p. 925-932
詳細
1962 年 48 巻 8 号 p. 925-932
The equilibrium of CO-CO2 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°C
The results obtained gave the following equatians:
C+CO2=2CO…… (1)
logK1 (=Pcoco2/Pcoco2·aC) =-7, 558/T+6·765
ΔF°1=34, 580-30·95T
O+CO=CO2…… (2)
logK2 (=Pcoco2/Pcoao) =8, 718/T-4·762
ΔF°2=-39, 880+21·78T
C+O=CO…… (3)
logK3 (=Pco/ac·ao) =1, 160/T+2·00
ΔF°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.
