In order to be suitable for tribological applications, polymeric materials, which can usually
exhibit mechanical strength, lightness, ease of processing, versatility and low cost, together
with acceptable thermal and environmental resistances, have to show good abrasion and
wear resistance. This target is not easy to achieve, since the viscoelasticity of polymeric
materials makes the analysis of the tribological features and the processes involved in such
phenomena quite complicated.
Thin sections and polished sections of the mortars were prepared in an impregnation unit
under vacuum with an epoxy resin. These were polished with 15 μm Al2O3 abrasive and
the final lapping was performed with diamond pastes (15–1 μm). Thin-sections were
analysed by light polarized microscopy using a petrographic polarizing Olympus BH2
microscope equipped with an Olympus DP-10 digital camera.
Grinding, or abrasive machining, is the process of removing metal in the form of minute chips by the action of irregularly shaped abrasive particles. These particles may be in bonded wheels, coated belts, or simply loose. The abrasive grains usually cut with a zero to negative rake angle and