Surface tension and wettability studies of liquid Fe-Ni-O alloys

Abstract

Surface tensions of iron-nickel alloys were measured as a function of oxygen potential at 1550 ЊC using the sessile drop technique. The surface tension of pure liquid nickel and iron-nickel alloys was measured at a total pressure of 1 atmosphere under varying CO 2 /CO ratios. An increase in the oxygen potential in the gas phase was found to correspond to a decrease in surface tension of pure nickel and iron-nickel alloys, indicating that oxygen is surface active in both liquid nickel and iron-nickel alloys. At low oxygen potentials, nickel additions to liquid iron were found to cause small decreases in alloy surface tensions; however, at higher oxygen potentials, the surface tension of the alloy exhibited a minimum value as nickel was added to iron. The adsorption coefficients of oxygen in liquid iron-nickel alloys and pure liquid nickel were determined from the surface-tension data using Belton's analysis, and were found to be similar to those calculated from kinetic studies. Wettability of iron-nickel alloys on an alumina substrate was studied through contact-angle measurements. At a constant alloy nickel content, the contact angle between the alloy and alumina decreased with increased oxygen potential in the gas phase.

Interactions between Exogenous Magnesia Inclusions with Endogenous Inclusions in a High Alloyed Steel Melt

“…Lachmann [19] investigated the boundary surface tensions of different slags with low alloyed steel and Cr-Ni steel. He found in agreement with other literatures [26,27] that the alloying elements chromium and nickel decrease the boundary surface tensions of steel. It should be mentioned that the influence of chromium on decreasing the boundary surface tension is greater than nickel.…”

Influence of Slag Composition on Slag–Iron Interfacial Tension

“…The measured interfacial tension remained unchanged when TiO 2 was added up to 25% in the slag. The values measured by Sharan and Cramb 13) using CaOAl 2 O 3 /Fe-20Ni system at 1 873 K, Evseev and Filippov 14) using CaO-Al 2 O 3 /steel system, Mao et al 15) using CaOSiO 2 -14Al 2 O 3 -5MgO (CaO/SiO 2 ϭ1)/Fe-0.3Si-0.14Ti-0.07Si system at 1 723 K and Pham et al 16) using 50MnO-Al 2 O 3 -TiO 2 /mild steel system at 1 773 K are also presented in the figure. The influence of TiO 2 in slag was found insignificant in all studies except that observed by Sharan and Cramb.…”

Interfacial Phenomena in Metal–Slag–Gas System during AOD Process

“…[8][9][10][11][12][13] Intensity of reactions and mass transfer between the slag and the metal were demonstrated by decreasing slag-metal interfacial tension. For example in Fig.…”

“…According to the literature, reactions in the gas-metal [5][6][7] and metal-slag [8][9][10][11][12][13] interface can influence dramatically on the value of interfacial tension between studied phases depending on the reaction rate. Mass transfer across the interface during reactions weakens the balance between the phases at the interface.…”