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Thermomechanical Effects in Embedded Passive Materials



Andrew J. Slifka, Elizabeth S. Drexler


Thermomechanical fatigue was measured using electron-beam moire (EBM) and infrared (IR) microscopy. A specimen was made using FR-4 printed wiring board, (PWB), a silver-filled conductive adhesive, and a carbon-filled conductive paste. Both filled polymeric materials are used fro embedded resistor applications. We studied the behavior of these materials and, particularly, the interfaces between these materials as a function of thermal cycling. The EBM gives quatitative information on localized strains, whereas the IR microscopy gives quantitative information on changes in heat flow. The filled polymeric materials showed strains of -0.6 % at -55 C and 1.4 % at 125 C. The interface between the silver and carbon-filled materials increased in thermal resistance on the order of 10-6 M2 K W-1 per thermal cycle.
Journal of Electronic Materials
No. 4


conductive adhesive, electron-geam moire, embedded passive, embedded resistor, infrared microscopy, thermal resistance, thermo mechanical fatigue


Slifka, A. and Drexler, E. (2002), Thermomechanical Effects in Embedded Passive Materials, Journal of Electronic Materials (Accessed February 23, 2024)
Created April 1, 2002, Updated February 17, 2017