Abstract
Nanocrystalline TiO 2 powders were electrophoretically deposited on the surface of Ti–6Al–7Nb alloy substrate. Post heat treatment at 850 °C was performed to improve the adhesion strength of the coating. The microstructure of the coating and substrate has been examined by light microscopy, scanning electron microscopy, analytical TEM methods (SAED, EDS) and X-ray diffraction. TEM investigations of cross-section thin foils allowed for detailed analysis of the coating microstructure. The TiO 2 film exhibited a nanocrystalline structure. SAED and XRD analyses show that the as-deposited nanocrystalline TiO 2 films exhibited anatase and rutile phase. The micromechanical properties (microhardness, Young's modulus) were measured. The results obtained show that TiO 2 films have low hardness and Young's modulus. During scratch tests any flaking or fracture was observed.
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