Kovar Alloy and K4 Glass Ultrasonic Welding

In this paper, the bonding mechanism of Kovar alloy and K4 glass ultrasonic welding and the influence of main process parameters on the joining process are analyzed. The influence of temperature and ultrasonic frequency on the welding results of Kovar alloy and K4 glass is proposed.

Ultrasonic soldering iron welding is a new connection method under the joint action of heat and ultrasonic. It can realize the direct connection of glass and metal in the atmosphere and lower temperature, without intermediate transition layer material, and the welding temperature is lower than the softening point of the material. The utility model has the advantages of small deformation of the weldment, high precision and good sealing performance. Suitable for the assembly and connection of electronic, electrical and micro-mechanical products, such as electric vacuum, electronic sensors, fuel cells, etc., has a wide range of applications and development prospects in the field of glass or ceramic and metal.

U-Bonder found through experiments that temperature and ultrasonic frequency are important process parameters affecting the welding of Kovar alloy and K4 glass by ultrasonic soldering iron. It is known from experiments that the welding rate (bonding area) increases with increasing temperature at a certain ultrasonic frequency. However, the temperature should not exceed a certain limit, otherwise the base metal will be damaged due to excessive temperature. Within a certain range, the welding rate increases with the increase of the ultrasonic frequency. This is because as the ultrasonic field increases, the liquid particle movement increases, the number of particles and deposition of interdiffusion and migration increases, and the interface bonding rate increases.

Ultrasonic soldering iron welding research is still in its infancy in China, and has received extensive attention from scholars, but more research has focused on how to achieve material connection, ultrasonic phenomena and process flow, while U-Bonder has formed a connection after years of research. The mechanism and its influencing factors have been deeply studied. Therefore, U-Bonder is committed to promoting the understanding of the laws based on physical chemistry and the improvement of the application method of glass (ceramic) and metal ultrasonic soldering iron.