Measurement and modeling of the effective thermal conductivity of sintered silver pastes

摘要: Abstract The effective thermal conductivity of sintered porous pastes silver is modeled through two theoretical methods and measured by means three experimental techniques. first model based on the differential medium theory provides a simple analytical description considering air pores like ellipsoidal voids different sizes, while second one arises from analysis scanning-electron-microscope images paste cross-sections finite element method. predictions both approaches are consistent with each other show that reduction can be minimized spherical maximized pancake-shaped ones, which most efficient to block conducting pathways. A 151.6 W/m K numerically determined for sample 22% porosity. This agrees quite well Lateral Thermal Interface Material Analysis suspended matches, within an uncertainty smaller than 16%, values obtained Raman thermometry 3ω technique, samples buried in silicon chip. consistence between our results demonstrates good predictive performance models describe behavior interface materials guide their engineering desired conductivity.