Evaporation of Manganese, Copper and Tin from Molten Iron under Vacuum

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  • Homma Masao
    The Research Institute for Iron Steel and Other Metals, Tohoku University
  • Ohno Reiichi
    The Research Institute for Iron Steel and Other Metals, Tohoku University
  • Ishida Tsuneo
    The Research Institute for Iron Steel and Other Metals, Tohoku University

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Other Title
  • 真空下における溶鉄からのマンガン，銅および錫の蒸発
  • シンクウカ ニ オケル ヨウテツ カラ ノ マンガン , ドウ オヨビ スズ ノ ジョウハツ

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In order to study the evaporation of manganese, copper and tin from molten iron, Fe-Mn, Fe-C-Mn, Fe-Cu and Fe-Sn alloys were melted at 1600°C under vacuum for 5, 10, 15 and 20 minutes by using a high frequency induction furnace. For the initial 10 or 15 minutes, the rates of loss of the alloying elements followed the first-order kinetics, and the following specific evaporation constants were obtained: <BR>(This article is not displayable. Please see full text pdf.) <BR>From these values, the ratios CS⁄Cm of surface concentrations to the bulk concentrations were calculated for manganese, copper and tin according to the equations derived by Ward. The values of CS⁄Cm are as follows: <BR>(This article is not displayable. Please see full text pdf.) <BR>The evaporation coefficient α and the distribution coefficient k which were derived by Olette and Fischer, respectively, were obtained experimentally, and also theoretically calculated according to their equations. In the case of Fe-Mn and Fe-Cu alloys, the theoretical value of α is greater than the experimental one. Generally in the melting for 5 minutes, the theoretical value of k is smaller than the experimental one. When the ratio CS⁄Cm is introduced into the coefficients α and k, the calculated values of the evaporation coefficient and the distribution coefficient are close to the experimental values.

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