1999 Volume 39 Issue 12 Pages 1231-1238
Isothermal phase relations for the MnO-Al2O3-TiO2 system have been investigated under moderately reducing conditions, PO2=2.29×10-11 atm and 1.91×10-10 atm at 1673 K and 1873 K, respectively, equilibrated with a saturating oxide tablet. Activities of MnO in the MnO-Al2O3-TiO2 system have been measured in equilibrium with silver at 1673 K and copper at 1873 K, respectively. Iso-activity curves for MnO have been drawn from the experimental results of the activities as well as those for Al2O3 and TiO2 calculated by Schuhmann's tangent intercept procedure, which provide the deoxidation equilibrium of molten steels.
The sulfide capacity significantly depends on MnO content in this ternary system. It slightly increases when Al2O3 replaces TiO2 at a constant MnO content in weight percent, whereas γMnS considerably decreases.
