Studies on the surface free energy of carbon-carbon composites: Effect of filler addition on the ILSS of composites

The effect of an inorganic oxidation inhibitor, such as MoSi2, on the surfa ce energetics of carbon-carbon composites has been studied. According to co ntact angle measurements based on a linear fit method obtained from multipl e testing liquids, such as water, diiodomethane, ethylene glycol, and glyce rol, it is observed that increasing the MoSi2 filler content of the composi tes leads to an increase of the surface free energy, mainly due to the incr ease of the London dispersive component of surface free energy, even if its specific or polar component is decreased. As an experimental result, the L ondon dispersive component is strongly dependent on the results of the inte rlaminar shear strength of the composites, In this work, it has been possib le to show that the results obtained from the linear fit method correlate w ith those determined from a two-liquid geometric mean when water and diiodo methane testing liquids are considered as a two-liquid pair. (C) 2000Academ ic Press.