Direct bonding for dissimilar metals assisted by carboxylic acid vapor

摘要

A low-temperature low-vacuum direct bonding process for dissimilar metals via surface modification and activation with carboxylic acid vapors has been proposed in this study. Robust joints of Cu/Zn, Cu/Ag and Ni/Zn could be obtained subject to thermal compression at 300 °C. Such joints still possess a shear strength higher than 10 MPa when the testing temperature reaches 250°C. It has great potential for wide applications, especially when low process temperature as well as high operation temperature is desired.