Evaluation of Surface Tension of CaO-SiO2-Al2O3-Based Mold Flux Containing Ce2O3

The calculation model based on the surface tension of CaO-SiO2-Al2O3-based mold flux containing Ce2O3 is studied using the modified Butler equation, and the surface tension of mold flux is measured by the sessile drop method. The experimental results show that the calculated surface tension based on the model agrees well with the experimental values, and the absolute value of the error is less than 3.23%. With the content of Ce2O3 in the mold flux increasing from 0% to 20%, the surface tension of the mold flux increases from 0.380 to 0.405 N m(-1). The O2- dissociated from Ce2O3 makes the radius of the silicon-oxygen tetrahedral anion decrease, and the ion-to-ion interaction force in the melt increase. Therefore, the surface tension of the melt increases with the increase of Ce2O3 content in the mold flux. However, the amount of dissociated O2- is limited, so the effect of Ce2O3 on the surface tension of the mold flux is limited.