Influence of Temperature Shocks on Climatic Aging of Conductive Adhesive Joints

Abstract

Adhesive joints made of two types of electrically conductive adhesives with epoxy matrix and silver filler were prepared by adhesive assembly of 0R0 resistors of the type 1206 on test boards that made four-point measurement of the joints resistance possible. The adhesives were applied by stencil printing. The joints were first exposed by 10 or 40 temperature shocks −40/+80 ° C. The exposure time of the samples at each temperature was 15 minutes; the time of the temperature change did not exceed 10 seconds. Then the joints were climatic treated at 80 °C and 80% relative humidity for 168 and 336 hours, respectively. It was inspected how the exposition of the joins by the temperature shocks will influence their resistance and and subsequently changing their resistance to climatic treatment. It was found that application of temperature shocks improved electrical conductivity of the joints formed of one adhesive and did not change properties of the joints made of the second one. An influence of the temperature shocks on the course of the climatic treatment of the joints was not found.