Wettability between Fe-Al alloy and sintered MgO

Abstract

In the current study, the wettability between Fe-Al alloy and sintered MgO substrate was investigated. The stable contact angle between the sintered MgO substrate and the liquid iron was approximately 134 o at 1550 o C, hardly influenced by Al concentrations of 18 ppm and 370 ppm in the liquid iron. By changing hydrogen partial pressure from 0 vol% to 1 vol%, the oxygen partial pressure decreased. Meanwhile, the contact angle between the MgO substrate and the liquid iron with 370 ppm Al increased with the decrease of oxygen partial pressure. The oxygen partial pressure and contact angle were scarcely affected by increasing hydrogen partial pressure from 1 vol% to 5 vol%. In all cases with 370 ppm Al in the liquid iron, oxide layers were detected on the surface of iron samples. The oxidation of iron could be effectively prevented by increasing the hydrogen partial pressure. The MgO substrate was reduced to Mg vapor in the reducing atmosphere at a high temperature. Then the Mg vapor was dissolved into the iron even before iron melting. Under thermodynamic equilibrium condition, an oxide layer containing two components, i.e. MgO•Al 2 O 3 phase and CaO-SiO 2-MgO-Al 2 O 3 phase, was generated on the surface of the iron sample. Due to the different wettability between the iron and the two phases, MgO•Al 2 O 3 phase was repelled, while the CaO-SiO 2-MgO-Al 2 O 3 phase adhered to the inside area.

Evaluation of Interfacial Energy between Molten Fe and Fe-18%Cr-9%Ni Alloy and Non-Metallic Inclusion-Type Oxides

“…The wettability between inclusions and molten iron or steel has been widely investigated. [8][9][10][11][12][13][14][15][16][17][18][19][20] However, the values of interfacial energy and contact angle reported in these studies cannot be compared because the studies were conducted under different experimental conditions (e.g., temperature, atmosphere, and crystal orientation). For example, molten Fe and Al 2 O 3 were investigated by Ogino et al, who reported a contact angle of 128° in H 2 atmosphere at 1 873 K. 11) However, Nakashima et al studied the same materials and reported a contact angle of 120° in Ar atmosphere at the same temperature.…”

Corrosion Tests for Refractory Materials Intended for the Steel Industry - A Review

“…where γ SV is the gas-solid surface tension, γ LV is the liquidgas surface tension, γ SL the liquid-solid surface tension, θ is the equilibrium contact angle. For refractories application the sessile drop test is used to follow the evolution of the contact angle as it can evolve with the temperature [12,[14][15][16][17] and composition [18][19][20][21][22][23][24].…”

Effect of Cerium on the Interaction between a Si–Mn‐Killed Steel and a MgO‐Based Refractory

“…The steel-refractory interaction was mainly affected by the chemical reaction and the steel penetration. [13][14][15] Thus, steel-refractory wettability had a strong influence on the steel penetration depth into the refractory. [16] Previous investigations mainly focused on the wettability between the steel and single-oxide materials, such as Al 2 O 3 and MgO.…”