| Abstract: | Oxygen activities in liquid iron deoxidized with aluminium were measured at 1873 K, using a mullite electrolyte having a Cr-Cr2O3 reference mixture. These results were compared with those obtained using commercial tube-type ZrO2-8 mol% MgO and plug-type ZrO2-9 mol% MgO probes, along with oxygen activities calculated from analysis. Oxygen activities from EMF measurements using mullite and plug-type probes were found to be in agreement with those calculated from the Al /AI2O3 equilibrium and those estimated from analyzed oxygen contents. Polarization effect due to electrochemical oxygen transport was observed in a commercial tube-type ZrO2-based probe. Supersaturation in liquid iron deoxidized with aluminium was also measured at 1873 K. |
