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采用Sn5Ag8Ti活性钎料,分别在真空下和采用超声波辅助钎焊技术在大气下对铝和石墨进行了钎焊,研究了超声波作用时间对钎料润湿母材与接头强度的影响,并从微观上与真空钎焊的接头形貌对比,研究了超声波作用下钎料在母材表面形成的微射流作用。结果表明,超声波作用2 s时钎料完全润湿铝,超声波作用6 s时,钎料完全润湿石墨,而且随着超声波作用时间的增加,钎料在母材上润湿的面积逐渐增大,钎焊接头的剪切强度也逐渐增强,超声波作用10 s时剪切强度达到最大值16 MPa。
Using Sn5Ag8Ti active brazing filler metal, aluminum and graphite were soldered under vacuum and ultrasonic assisted brazing technology under vacuum respectively. The effect of ultrasonic action time on the wettability of the brazing material and the strength of the joint was studied. Compared with the shape of vacuum brazed joint, the effect of micro-jet formed on the surface of the base metal by ultrasonic wave was studied. The results show that the brazing filler metal completely wetted the aluminum when the ultrasonic wave was applied for 2 s and the filler metal completely wetted the graphite when the ultrasonic wave was applied for 6 s. With the increase of ultrasonic action time, the wetting area of the brazing filler metal gradually increased , The shear strength of brazed joints also gradually increased, and the shear strength reached 16 MPa at 10 s under ultrasonic wave.