The effect of sliding speed and normal load on the friction and wear behavior of TiO2 thin films

Abstract EN

The tribological behavior of TiO2 thin films was investigated against test parameters.The friction coefficient under different normal loads, sliding speeds, and numbers of cycles was studied using a micro-scratch tester.The surface morphology of the EPD layers was observed using atomic force microscopy (AFM), the composition of the EPD layer was determined from the peak intensity using an X-ray diffractometer (XRD) and mechanical properties of films was investigated by nanoindentation technique.The results showed that varying normal load or sliding speed influences the friction coefficient, the wear volume and the wear specific coefficient.

It was found, also, that a change in the wear behavior occurs when a critical value of normal load is exceeded.

In fact, at low normal load (Fn< 1 N), the stable friction leads to an insignificant wear.

Moreover, for Fn> 1 N, the friction decrease is induced by wear particles.

The analysis developed in this paper confirms a good wear resistance of the TiO2 coatings.