Kinetics of Reaction Interaction Between Molybdenum and Iron–Tin and Iron–Copper Melts

The solubility of molybdenum in Fe–Cu and Fe–Sn melts and the growth kinetics of Mo 6 Fe 7 layer at the molybdenum–melt interface at 1200°C are examined. The solubility of molybdenum in these melts is well described by the following equations: lgC Mo = (–3.957 ± 0.176) + (25.77 ± 7.94) X Fe –– (143.02 ± 77.92) X Fe 2 (Fe–Cu melt) and lgC Mo = (–2.783 ± 0.011) + (7.563 ± 0.111) X Fe –– (10.844 ± 0.245) X Fe 2 (Fe–Sn melt). The melt composition (atomic fractions) in the three-phase Mo–Mo 6 Fe 7 –melt equilibrium is established: 6.4 · 10 –3 Fe, 1.64 · 10 –4 Mo, and Cu being the rest (Fe–Cu melt); 0.046 Fe, 3.48 · 10 –3 Mo, and Sn being the rest (Fe–Sn melt). The substantial difference between the growth rate constants in the melts, k Fe–Sn >> k Fe–Cu , at the same iron activity a Fe is attributed to the effect of admixtures (Cu and Sn) on the growth of the Mo 6 Fe 7 layer. Data on the solubility of molybdenum in Fe–Cu and Fe–Sn melts and the growth kinetics of Mo 6 Fe 7 in these melts are obtained for the first time.