Interfacial Tension between Molten Iron and CaO-SiO_2 Based Fluxes




    • SUN Haiping
    • Department of Materials Science and Engineering, Kyushu University
    • MORI Katsumi
    • Department of Materials Science and Engineering, Kyushu University


Flux-metal interfacial tension has been examined by X-ray photography of a metal drop melted in a molten flux. The experiments were carried out at 1 580°C using a zirconia crucible with low solubility in the fluxes. The systems used in the investigation were as follows:<br>Metal phase: Fe-O alloy, oxygen content in the alloys varied from 0.002 to 0.070 mass%.<br>Flux phase: Ternary system: CaO-SiO<sub>2</sub>-M<sub><i>x</i></sub>(F, O)<sub><i>y</i></sub>, where M<sub><i>x</i></sub>(F, O)<sub><i>y</i></sub> represents NaF, CaF<sub>2</sub>, Al<sub>2</sub>O<sub>3</sub>, Na<sub>2</sub>O, MgO, Li<sub>2</sub>O or ZrO<sub>2</sub> and concentrations varied from 2 to 40 mass%. Multicomponent system: CaO-SiO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub>-Fe<sub>2</sub>O<sub>3</sub>-Na<sub>2</sub>O-NaF-CaF<sub>2</sub>-MgO-Li<sub>2</sub>O-ZrO<sub>2</sub>. <br>The interfacial tension was observed to increase with increasing NaF, CaF<sub>2</sub>, Na<sub>2</sub>O, MgO or Li<sub>2</sub>O contents, while only minor changes in the values were observed with varying Al<sub>2</sub>O<sub>3</sub> or ZrO<sub>2</sub> contents in CaO-SiO<sub>2</sub> or CaO-SiO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub> systems. The interfacial tensions between flux and molten iron decreased with increasing oxygen activity in iron, <br><br> γ=γ<sub>0</sub>-0.324 ln(1+116<i>a</i><sub>O</sub>)


  • ISIJ international  

    ISIJ international 37(4), 323-331, 1997-04-15 

    The Iron and Steel Institute of Japan

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