Thermodynamic Properties of the MGO-BO1.5 Binary System at 1723K
Xianming Huang, Toshiharu Fujisawa, Chikabumi Yamauchi
To determine the thermodynamic properties of the MgO-BO1.5 binary system, the following reaction was used:
MOn(in slag)+nC(gr.)=M(in liquid copper)+nCO (g)
where MOn represents MgO or BO1.5.
The activity coefficients of boron and magnesium in liquid copper were first determined by equilibrating pure liquid B2O3 or pure solid MgO with liquid copper under controlled CO partial pressure in a graphite crucible at 1723K:
ln γB=0.82+2.81xB, ln γMg=-1.22 (xB≤0.106, xMg≤0.0013)
The themodynamic properties of MgO and BO1.5 in MgO-BO1.5 binary slag at 1723K were determined as a function of composition by equilibrating the MgO-BO1.5 slag with liquid copper under CO atmosphere. In addition, the interaction parameter (εMgB) in the Cu-B-Mg alloy was determined to be -100 at 1723K.
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