Ultrasonic welding of ceramics/metals using inserts

This paper gives a description of an experimental study of the ultrasonic welding of ceramics and metals using inserts. Ultrasonic welding has made it possible to weld various ceramics such as Al2O3, SiC, Si3N4, AlN, to metals at room temperature, quickly and easily compared to other welding methods. For example, the ultrasonic welding of Si3N4/Al/Cu can be accomplished under the conditions of: amplitude of ultrasonic horn top, 23 μm; welding pressure, 20 MPa; and required duration, 1 s. The ultrasonic-welding technique can be carried out in many different ways, such as the direct welding of ceramics/metals, welding with a metal coating on the ceramics surface by vacuum deposition and welding with a metal insert. The insert material and the vaporized film used for auxiliary purposes play the role of binders to facilitate welding, but little difference in welding strength was found between the welds with the metal insert and the vaporized film. Since ultrasonic vibration cleans the contact surface, there is no need to carry out surface treatment prior to welding.