Estimation of Hamaker Constants of Al<SUB>2</SUB>O<SUB>3</SUB>/Al<SUB>2</SUB>O<SUB>3</SUB>, Al<SUB>2</SUB>O<SUB>3</SUB>/Bubble in Molten Iron Using Fowkes's Method

The Hamaker constants of molten iron and Al2O3/Al2O3 and Al2O3/bubble in molten iron at 1600°C (AFe, AAFA, AAFB) were estimated using Fowkes's method from the wettabilities and the Hamaker constant of Al2O3 at room temperature and the values obtained were as follows respectively :AFe=10.5×10-19JAAFA=3.98×10-19JAAFB=6.47×10-19JThen, coagulation coefficient of Al2O3 inclusions in turbulent molten steel and the separation rate of inclusions caused by the interaction with bubbles were estimated through using the Hamaker constants obtained to the theories reported by other researchers.