Silicon Deoxidation Equilibrium of Molten Fe-Mo Alloy

Abstract

MoSi (in Fe) , is determined to be 43(Ϯ13) from the equilibrium for silicon distribution between Fe and Ag phases in Fe-Ag-Si-Mo system. The experimental results on the deoxidation equilibrium of molten Fe-Mo alloy with silicon reasonably agree with the calculated ones by using e Mo Si (in Fe) ϭ43(Ϯ13) derived in the present study. The oxygen contents after the deoxidation treatment by silicon are estimated for 8 kinds of steel. The oxygen content of ferrous alloys including molybdenum can be reasonably estimated using the interaction parameter of Mo for Si derived in the present study.

The effect of Si on metal–silicate partitioning of siderophile elements and implications for the conditions of core formation

“…Our experimental results were obtained over a much wider range of Si content of the metal, 0-19.4% and yield (Fig. 5) a slightly smaller epsilon value than that obtained by Ono-Nakazato et al (2007). Because, as can be seen from Fig.…”

“…A more recent experimental study (Ono-Nakazato et al, 2007) gives a much lower value of 43 ± 13 at Si concentrations up to 3.06% Si. Our experimental results were obtained over a much wider range of Si content of the metal, 0-19.4% and yield (Fig.…”

“…Metallurgical data indicate that dissolution of even small amounts of Si in liquid Fe can have profound effects on the activities of some trace components, notably of Mo (Ono-Nakazato et al, 2007), which means that significant partitioning of Si into the core of the growing Earth should have affected the observed minor element composition of the mantle. This in turn will change the estimated pressure-temperature-fO 2 conditions of accretion and core formation.…”

Examples of Steelmaking Thermochemistry

“…The relationships between silicon and oxygen contents are shown in Figure 3.8.3. The silicon deoxidation equilibria of Fe-0-0.95%Mo-Si-O alloys under the condition of a SiO 2 ¼ 1 at 1873 K were investigated, and the experimental results are also plotted in Figure 3.8.3 [4]. The equilibrated oxygen content rapidly decreases with an increasing molybdenum content at the same silicon content when using e Si Mo ¼ 2.36 [3].…”

“…The equilibrated oxygen content rapidly decreases with an increasing molybdenum content at the same silicon content when using e Si Mo ¼ 2.36 [3]. The oxygen content also decreases with an increasing molybdenum content when using e Si Mo ¼ 0.11 [4] although the effect of the molybdenum is clearly much less.…”