Effect of ultrasonic vibrations on wetting of Fe, FeSn2/Fe and Quartz in Sn

The wettability of pure Sn on Fe, FeSn2/Fe and Quartz substrate was investigated when performed the wetting balance method at 573 K using assistive ultrasonic vibrations. For revealing the mechanism of accelerated wetting by ultrasonic vibrations, the wettability of the Fe/Sn and Quartz/Sn system were investigated. Further, the SEM micrographs after the wetting were imaged. The internal ultrasonic pressure distribution in the pure Sn was calculated utilizing the COMSOL finite element software. The results showed the wettability of the Fe/Sn and Quartz/Sn were greatly accelerated under ultrasonic vibrations. The wetting force of the Fe/Sn increased non-linearly with ultrasonic power. However, the wetting force of the Quartz/Sn increased linearly with the ultra-sonic power, but the value of the wetting force was minus. At the Fe/Sn system, by the interfacial reaction caused the driving force required for the wetting of the Fe/Sn system dramas a dominant factor. The surface oxidation film of the base metal and molten solder were removed by ultrasonic vibration; hence, ultrasonic vibration furthered the interdiffusion of S/L interface atoms and accelerated the interfacial reaction, resulting in the wetting driving force of the pure Sn enlarged.