Surface interactions between fayalite slags and synthetic spinels and solid solutions

To obtain a better understanding of the complex corrosion mechanisms occurring at the interface, the surface and interfacial properties between fayalite-type slags and homogeneous, synthetic spinels and solid solutions of these spinels were investigated. These oxides represent the conventional refractory components. The sessile drop technique incorporating high-temperature X-ray radiography was employed for this purpose. The experimental temperature was 1200 degree C and the oxygen potential was 10 super(-9) atm controlled by CO/CO sub(2) gas mixture. The contact angles between the solid substrates and molten silica-rich fayalite slag ranged from 0 deg for MgFe sub(2)O sub(4) to 23 deg for MgAl sub(2)O sub(4). When iron-rich slags were employed, the contact angles ranged from 15 deg for MgCr sub(2)O sub(4) to 22 deg for MgAl sub(2)O sub(4). The interfacial reactions between the slags and the various spinel materials and the dissolution of the solids into the slags are discussed.