<研究>鐵合金のガス吸收(第1報) : 純鐵のN_2,H_2,O_2ガス吸收

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Studies on the absorption of gases by molten metals are few as well as inaccurate, though it is of great importance from the practical and physical points of view. At first, experiments on the absorption of nitrogen by molten iron were carried out between 1,530 and 1,750℃, and the following results were obtained. The saturation value and the rate of absorption by molten iron are affected appreciably by impurities, especially by silicon. The saturation value of the purest iron measured in our laboratory is 0.039_1 wt.%N_2 at 1,600℃. The temperature coefficient is about 1.4×10^<-5>wt.%N_2 per degree, though the temperature function of absorption is not in linear relation to temperature as shown by Equation (1). The absorption of nitrogen by liquid and solid iron was studied by means of statistical thermodynamics, basing on the fundamental conception that the structure of molten iron is quasi-crystalline and the gas atoms absorbed are situated at the vacant spaces in iron lattice interstitially. Thus, the following theoretical equation was obtained for the saturation value.[chemical formula]By comparing the equation with the experimental results, it was found that the theoretical values coincided satisfactorily with the experimental ones, when suitable values were given for characteristic temperature θF and interaction energy ψF. Further, the absorption of hydrogen was considered and the data were explained by the above equation in the same manner. The absorption of oxygen by molten iron was also interpreted from statistical thermodynamics by the consideration of the equilibrium between the melt (Fe-C-O) and mixed gases (CO+CO_2).
東北大学の論文
1950-03-25

<研究>鐵合金のガス吸收(第1報) : 純鐵のN_2,H_2,O_2ガス吸收

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