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MgAl2O4 spinel containing refractory castables have been widely used as steel ladle lining, due to their high corrosion resistance to slag attack, low thermal expansion and good thermal conductivity.1–5) Nonetheless, this refractory deteriorates with slag penetration into the refractory because some parts of the refractory are always in contact with liquid slags. Therefore, longer refractory working life can be achieved if slag penetration is suppressed. This penetration phenomenon is related to the wetting between the refractory and slags.5,6) In addition, dissolution reaction between slag and refractory affect wetting and spreading rate.7,8) Several studies have been carried out for wettability between slag or molten iron and the refractory to elucidate the corrosion mechanism of the refractory. N. Fukami et al.6) studied the effect of the structure of the refractory on wettability of molten iron by using sessile drop technique and found that the adhesion between molten iron and the MgAl2O4 substrate was driven by interfacial bonding. Besides, H. Abdeyazdan et al.9) studied the dynamic wetting of CASM slag on the spinel using a modified sessile drop technique. They found that the contact angle of the slag Wetting, Spreading and Penetration Phenomena of Slags on MgAl2O4 Spinel Refractories

Wetting, Spreading and Penetration Phenomena of Slags on MgAl<sub>2</sub>O<sub>4</sub> Spinel Refractories