熔鐵中に於けるアルミニウム酸素炭素間の平衡反應の測定

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The deoxidation with aluminium is one of the important reaction in steel making process ; hence thaoretical attempts to calculate the deoxidation constant for this element from the free energies of various reactions yielded results which were invariably lower than the experimental values. As the direct measurement of this reaction was very difficult, the author measured indirectly the equilibrium of equation (1) using a pure carbon crucible in atmosphere of CO gas at the temperature range from 1650 to 2060℃. 2<Al>___-+3CO(g)⇆3C__-+(Al_2O_3)_<〓at>……(1) From the experimental results, following equation was obtained as the temperature function of the equilibrium constant logK_<Al-C>=[%C]^3/[%Al]^2=6094.9/T-1.452……(1′) Then, the author calculated the equilibrium constant of reaction (2) from the equilibrium between oxygen in molten iron and H_2-H_2O gas mixture and the free energies of various reaction. O__-+C__-⇆CO(g)……(2) logK_C=logP_<CO>/[%O][%C]=2193.4/T+1.936……(2′) Combining eq. (1) with eq. (2), the equilibrium relation between oxygen and aluminium in molten iron was obtained 3O__-+2<Al>___-⇆(Al_2O_3)……(3) logK_<Al-〓>=log 1/[%O]^3[%Al]^2=12675/T+2.85……(3′)⊿F°=-57988-13.03T Further, the ternary deoxidation diagram of oxygen, carbon and aluminium when presented together in molten iron was presented and discussed.
社団法人日本鉄鋼協会の論文
1953-04-25