We proposed a new method for quantifying the micro/nano-scale wear volume (i.e., volume of wear loss) in a test to characterize the wear-resistance of nanocomposites. Effects of wear load and pass (a pattern of scan cycles), and nanoparticle content on the wear behavior of silica nanoparticle-reinforced composites (EP/SiO2) were studied accordingly. The multiple nano-scratch patterning technique was carried out for the wear test. Images of sample surface, before/after the test, obtained using in-situ scanning probe microscopy (SPM) were used to calculate the wear volume. Our results indicate that the wear mechanism transits from a plastic-deformation dominated mode to a fatigue-wear dominated mode when the wear load and pass increase above a threshold. The transition threshold increases with the nanoparticle content, and the increase corresponds to an improvement in wear resistance of nanocomposites. This transition threshold can be a different way, rather than using the conventional mechanical properties (e.g., surface hardness and stiffness), to characterize the wear resistance of materials such that the wear condition is taken into account.
Citation: Composites Science and Technology
Pub Type: Journals
Nano composites, Wear, Mechanical properties, Scanning probe microscopy (SPM), polymers