溶鉄,溶融Fe-CrおよびFe-Cr-Ni合金の気相との反応速度

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The rates of nitrogen desorption of liquid iron and liquid Fe-Cr alloys are explained by the application of the mixed-control model including the mass transfer in the liquid phase and the chemical reaction at the interface where an adsorbed nitrogen atom collides with a nitrogen atom in the liquid phase and then a nitrogen molecule is formed. Although the rate of nitrogen desorption has been regarded as the chemical reaction control, the mass transfer in liquid iron may play an important role on the nitrogen desorption at the lower oxygen range.It is also found that the apparent mass transfer coefficient of nitrogen absorption kNI are illustrated by applying same mixed-control model.The oxygen absorptions of liquid iron, liquid Fe-Cr and Fe-Cr-Ni alloys from gas phase are represented by a model that the most of gaseous oxygen dissolves into liquid iron through oxide free interface, although some of them forms iron oxide at the interface and then dissolves into liquid iron. This model is valid for liquid iron in the range above 0.057atm PO2 and for liquid Fe-18Cr alloy above 0.003atm PO2 When the partial pressure of oxygen is lower than those values, however, the formation of oxide could be practically ignored, so that the rate of oxygen absorption is controlled simply by the mass transfer in gas phase. On the other hand, the amount of oxygen accumulated at the interface as oxide phase in liquid alloy should be larger than that in liquid iron under the same oxygen potential.
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溶鉄,溶融Fe-CrおよびFe-Cr-Ni合金の気相との反応速度

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