超声作用下活性钎料在石墨表面的铺展行为

本文采用超声波辅助铺展润湿技术,进行了活性钎料在多孔材料石墨表面的动态铺展实验。通过采用高速摄像技术对超声波作用下钎料铺展过程的外部特征进行捕捉、描述和分析,研究了超声波作用下活性钎料在石墨表面的铺展行为及其机理。研究结果表明,超声波在石墨表面振幅衰减很快,这使得超声波作用下的声致铺展作用在石墨表面很难进行,但随着石墨表面的孔洞被钎料填充,振幅衰减逐渐减小,声致铺展作用逐渐加强,在超声波功率足够大的情况下,液态钎料可以在石墨表面铺展。钎料表面氧化膜是阻碍钎料铺展的关键因素,通过施加超声波可去除钎料表面氧化膜促进钎料铺展。

Spreading Behaviors of Active Solder Droplets on the Surface of Graphite by ultrasonic Vibration

The dynamic spreading experiment of active solder on the surface of the porous graphite had been completed by the ultrasonic-assisted spreading technology. In this paper, the spreading process of an active solder droplet was captured by a high-speed camera. And the external characteristics of spreading under the action of the ultrasonic were analyzed. The spreading behavior and mechanism of active solder droplets on the surface of the graphite were studied under the action of ultrasonic wave .The results showed that ultrasonic amplitude was been decayed quickly in the surface of graphite, which makes it impossible for acoustic spreading on the surface of graphite. However, as these holes on the surface of the graphite were filled with solder, amplitude attenuation was decreased, acoustic spreading function was strengthen gradually. In the case of ultrasonic power is large enough, the liquid solder can spread on the graphite surface. Solder surface oxidation film is the key factors that hinder the solder spreading. The surface oxidation film of solder can be removed by ultrasonic vibration.