Non-reactive versus dissolutive wetting of Ag–Cu alloys on Cu substrates

Progress in Wettability Study of Reactive Systems

“…Another method being employed in wettability study is the dispensed drop method [28,42]. In this method, the droplet is extruded through a capillary introducer as shown in Figure 3 [42].…”

“…∘ is reported to be less than 10 −1 s [28,80]. For the case of complete wetting of a solid surface by a liquid, wetting dynamics are reportedly dominated by a precursor film which spreads ahead of the main body of fluid [1,38].…”

“…In reactive wetting systems where there is alloying between the chemical species of the liquid and the solid substrate, there is a likely tendency for solute-capillary effect, if the difference in surface tension between the two chemical species is large [28,29]. In the early stages of reactive regime in wetting where there is dissolution of the substrate into the liquid droplet, the concentration of the solute is usually larger at the contact line/solid-liquid interface than at the top of the droplet.…”

“…Therefore, spreading will be retarded at this stage. On the other hand, spreading will be accelerated if the surface tension of the solute is higher than that of the liquid [28].…”

“…Recently, an interesting study was made into the wetting of Ag-Cu alloys on Cu substrates at 900 ∘ C, using dispensed drop technique [28]. Equilibrium and nonequilibrium systems were considered by using Cu-saturated and non-Cusaturated liquid.…”