Climatic Aging of Conductive Adhesive Joints on Pads with Different Surface Finishes

Abstract

Adhesive joints formed from four types of electrically conductive adhesives based on an insulating matrix from the bis-phenol epoxy matrix and silver filler have been aged at the combined temperature-humidity climate. Four combinations of these parameters have been used for climatic treatment: 25 °C and 50 % or 85 % RH, 85 °C and 50 % or 85 % RH. The total time of aging 400 hours has been divided into two stages. The resistance of the joints has been measured at the start, after 168 hours, and at the end of aging. It has been found that the combination of increased temperature and increased humidity causes the fastest increase of the joint resistance while aging at the higher temperature and normal humidity or the normal temperature and elevated humidity has a comparable effect on the change in joint resistance.