Effect of Carbon Dissolution Reaction on Wetting Behaviour of Molten Fe–C Alloy on Graphite Substrate in the Initial Contact Period

Abstract

A wetting behaviour of Fe-C sample on carbonaceous materials has been extensively investigated to understand the liquid flow behaviour in lower part of blast furnace. The previous studies reported a large change in apparent contact angle in the initial contact period in the wetting between the Fe-C sample and the carbonaceous materials substrate. The carbon dissolution reaction and the interfacial morphology in the initial contact period would strongly affect the wetting behaviour in this period. To further understand the wetting behaviour between the Fe-C sample and the substrate, the effects of the carbon dissolution reaction on the wetting behaviour in the initial contact period must be considered. 4.26,4.90 mass% C samples were fabricated using a high-frequency induction heating furnace under an inert gas atmosphere. The graphite substrate was made from 99.90% pure graphite powder using a hot press furnace under an argon gas atmosphere. The wetting behaviour of the graphite substrate with molten Fe-C sample is investigated using a sessile drop method with a molten sample injection and quenching systems. The results shown that the apparent contact angles significantly decreased from the initial apparent contact angle. The carbon concentration of the carbon-unsaturated Fe-C sample gradually increased and reached the saturation after the 300 s of contact. The formation of concave was observed and developed in the initial contact period due to the transfer of carbon atoms into the carbon-unsaturated Fe-C sample. The wetting behaviour was dependent on interfacial energy of solid-liquid phases before the formation of concave. After the formation of concave, the wetting behaviour dominantly depended on interfacial morphology change.KEY WORDS: wetting behaviour; initial contact period; sessile drop method with molten sample injection system; quenching system; carbon dissolution reaction; interfacial morphology; formation of concave.

Flux‐Mediated Wetting of Alumina by Liquid Fe–Ti–Csat

“…[5,16] Rather this was an ex situ method to compare the different metal-crucible interactions and to determine the effectiveness of the mitigation technique. Though the metal was contained in crucibles rather than flat substrates, this procedure was not dissimilar to the quenching method used by Nguyen et al [17] Upon cooling, samples were sectioned in half vertically, mounted in epoxy, and polished to measure the angle of contact between the metal and crucible. Representative measurements are shown in Figure 3 of the metal with graphite crucibles and MgO.…”

“…The angles were measured in a similar way to that in the literature. [17,18] Because MgO filled the crucibles, the angle measured was between the top surface of the metal and the crucible wall.…”

Measurement for Contact Angle of Iron Ore Particles and Water

“…Generally, sessile drop method, 36,54,55) captive bubble method, 38,56,57) environmental scanning electron microscopy (ESEM) method 44,52,58,59) and gel trapping method 45,47) are direct methods. These methods obtain contact angles by observing the forming angles directly based on the theory of Young.…”

Morphology Change and Carburization Characteristic of Iron Ore-Coal Composite During Reduction under a Simulated Condition of Blast Furnace

“…According to the information of reduction degree, microstructure observation and remained carbon of reduced iron, it can be concluded that metallic iron was formed, carburization was occurred, and part of metallic iron was melted into droplets. References [17][18][19][20] reported that when the amount of carbon dissolved in liquid iron is increased, the contact angle between liquid iron and carbon substrate is increased accordingly. In other words, the wettability is lowered as the carburization of reduced iron increases.…”