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俞伟元,颜泽华,刘新亚.超声作用下活性钎料在石墨表面的铺展行为[J].稀有金属材料与工程(英文),2018,47(9):2881~2887.[yu weiyuan,Yan Zhehua and Liu Xinya.Spreading Behaviors of Active Solder Droplets on the Surface of Graphite by ultrasonic Vibration[J].Rare Metal Materials and Engineering,2018,47(9):2881~2887.]
Spreading Behaviors of Active Solder Droplets on the Surface of Graphite by ultrasonic Vibration
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Received:November 21, 2016  Revised:March 22, 2017
Key words: graphite  active solder  spreading  ultrasonic vibration
Foundation item:国家自然基金资助项目(51465032)
Author NameAffiliation
yu weiyuan,Yan Zhehua and Liu Xinya  
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      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.