The contact angle between molten Fe-Al alloy with 0.03, 0.3, and 3 mass% Al composition, and Y 2 O 3 matrix oxide substrate with 0.002, 0.32, and 1 SiO 2 activity was measured using sessile drop method in Ar atmosphere at 1 873 K, and the interfacial tension was evaluated. The contact angle and interfacial tension between the molten Fe-0.3 Al alloy and the Y 2 Si 2 O 7 + SiO 2 (a SiO2 = 1) substrate decreased over time during 60 s after the molten alloy was dropped onto the substrate. The decrease of the contact angle was 20°, and that of the interfacial tension was 628 mN•m −1 Conversely, the other contact angles and the other interfacial energies were almost stable during the same period. The decrease of the contact angles ranged between 0° and 7°, and that of the interfacial tensions ranged 4 and 195 mN•m −1 . By observing the wetting behavior for 60 min, it was recognized that the interfacial reaction between the Fe-Al alloy and the oxide substrate was the redox reaction between Al composition in the alloy and SiO 2 composition in the substrate, composed of SiO 2 decomposition reaction and Al 2 O 3 formation reaction between oxygen absorbed at the interface and Al composition in the alloy. In addition, it was indicated from the interfacial tension dependence on SiO 2 activity that the medium SiO 2 volume slag for the molten low-Al steel and the low SiO 2 volume slag for the molten high-Al steel were effective in preventing the small droplets of molten slag into the molten steel.
The contact angles between three non-metallic inclusion-type oxide substrates, viz. Al 2 O 3 , MgO, and MgO•Al 2 O 3 , and molten Fe and molten Fe-based stainless steel (Fe-Cr-Ni alloy) were measured using the sessile drop method in Ar atmosphere at 1873 K. The contact angles between molten Fe and oxide substrates ranged between 111° and 117°, while that between molten Fe-Cr-Ni alloy and substrates ranged between 103° and 105°. The angles between the alloy and each of the substrates were smaller than the corresponding values for Fe, which was attributed to the superior wettability of molten Fe-Cr-Ni alloy on the substrates. The wettability of the molten materials is related to the interfacial tension between the molten metals and each substrate. Thus, the interfacial tension between the molten metals and the non-metallic substrates was quantitatively evaluated using Young's equation and the measured contact angles; the interfacial tension for molten Fe ranged from 1.862 to 2.781 N•m −1 , while that for molten Fe-Cr-Ni alloy ranged from 1.513 to 2.286 N•m −1 . Owing to the higher reactivity between molten Fe-Cr-Ni alloy and the substrates, the interfacial tension and energy between them were lower than those between molten Fe and the substrates.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.