A Novel Hermetic Sealing Method for the Metal Package Based on Electric-Current-Assisted Sintering of Silver Paste

Based on electric-current-assisted sintering (ECAS) of silver paste, we propose a novel hermetic sealing method for the metal package. The monitoring of the temperature field during the bonding process shows that hermetic packaging based on ECAS of silver paste is a local heating method which has little impact on the component. During the process of ECAS, the heating rate of sintered joint dropped a lot with the removal of organics, and the reliable sintered joint is gradually formed after the removal of organics. Increasing the current gets higher peak temperature of the sintered joint, which is beneficial to form a denser and robust joint. The hermeticity of the sealed specimen and the shear strength of the sintered joint are improved with the increase of peak temperature. When the peak-temperature reaches above 400 °C, the joint will be dense enough to ensure the leakage rate of specimen below the reject limit.