研究目的
Investigating the effects of alloying elements (Si, Cu, Ti, Mg) and their concentrations on the wettability in the Al/SiC system to clarify controversial results in the literature.
研究成果
Alloying elements significantly affect wettability: Si improves it via adsorption and inhibits Al4C3 formation; Cu slightly degrades wettability but reduces Al4C3; Ti enhances wettability through TiCx formation; Mg aids in oxide disruption but has limited effect in clean systems, with evaporation causing pseudo-improvements. The dispensed sessile-drop method provides more accurate measurements by reducing surface oxidation effects.
研究不足
The study is limited to specific alloy compositions and temperatures; evaporation effects (e.g., Mg) may not be fully accounted for in all conditions; surface oxidation can influence results despite efforts to mitigate it.
1：Experimental Design and Method Selection:
A dispensed sessile-drop method was used to evaluate wettability, involving mechanical extrusion of molten alloy drops onto SiC substrates to remove surface oxide films.
2：Sample Selection and Data Sources:
Pure Al and Al binary alloys (Al-Si, Al-Cu, Al-Ti, Al-Mg) with varying concentrations were prepared by induction or arc melting. Substrates were pressureless-sintered polycrystalline α-SiC.
3：List of Experimental Equipment and Materials:
Equipment includes alumina tubes, vacuum chamber, CCD camera for image recording, SEM with EDS, XRD, micro-XRD. Materials include pure metals (Al, Cu, Ti, Mg, Si), SiC substrates, diamond pastes for polishing.
4：Experimental Procedures and Operational Workflow:
Alloys were melted and dispensed onto SiC substrates in high vacuum or Ar atmosphere. Drop profiles were recorded and analyzed using axisymmetric drop-shape-analysis software. Post-experiment, samples were sectioned and examined for microstructure and phases.
5：Data Analysis Methods:
Contact angles and drop geometric parameters were calculated from images. Statistical thermodynamic models and first-principles calculations were used for theoretical analysis.
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