Properties of the thermally sprayed Al2O3–TiO2 coatings deposited on titanium substrate

Abstract Based on the fact that titanium and titanium alloys have poor fretting fatigue resistance and poor tribological properties, it is necessary to apply some surface engineering methods in order to increase the exploitation characteristics of these materials. One may either implement some surface treatment technologies or even deposit overlay coatings by thermal spraying. The present study is focused on the achieved properties of the ceramic coatings (Al 2 O 3 + 13 wt.% TiO 2 ) deposited onto a titanium substrate using high velocity oxygen fuel (HVOF) and plasma spraying (APS) respectively. The effect of the deposition method on the microstructure, phase constituents, and mechanical properties of the ceramic coatings was investigated by means of scanning electron microscopy (SEM), X-ray diffraction technique (XRD) and nanoindentation tests. The sliding wear performances of the Al 2 O 3 –TiO 2 coatings were tested using a pin on disk wear tester.