Wettability of Molten Fe-Al Alloys Against Oxide Substrates with Various SiO<sub>2</sub> Activity

The contact angle between molten Fe-Al alloy with 0.03, 0.3, and 3 mass% Al composition, Y2O3 matrix oxide substrate 0.002, 0.32, 1 SiO2 activity was measured using sessile drop method in Ar atmosphere at 1873 K, the interfacial tension evaluated. Fe-0.3 Y2Si2O7 + (aSiO2 = 1) decreased over time during 60 s after dropped onto substrate. decrease of 20°, that 628 mN・m−1 Conversely, other angles energies were almost stable same period. ranged 0° 7°, tensions 4 195 mN・m−1. By observing wetting behavior for min, it recognized reaction redox composition substrate, composed decomposition Al2O3 formation oxygen absorbed interface alloy. In addition, indicated from dependence on medium volume slag low-Al steel low high-Al effective preventing small droplets into steel.