Title : Mechanical properties of coatings composed of several nanostructures deposited on Ti and Ti13Nb13Zr alloy
The multi-wall carbon nanotubes (MWCNTs) coatings with nanostructural additions, such as nanocopper and titania, were electrophoretically deposited on Ti Grade II and Ti13Nb13Zr alloy substrate for the biomedical applications purpose. To study the chemical and phase composition, roughness, wear resistance, plastic and elastic properties an optic microscopy, scanning electron microscopy, X-ray electron diffraction spectroscopy and nanoindentation were applied. The best mechanical, plastic, and elastic properties in terms of biomedical application were achieved for the MWCNTs coating with titania layer deposited on Ti Grade II substrate, while the coating composed of MWCNTs and nanocopper turned out to be more brittle when deposited on Ti alloy than on Ti grade II. Generally, both the addition of nanocopper and titania improved the mechanical properties of the base MWCNTs coating deposited on Ti grade II, but for Ti alloy, which served as a substrate for MWCNTs coatings, the additions just improved the capability of the MWCNTs coating to accommodate substrate deflection under applied load. This could be explained by the fact that more homogenous coatings are generally formed on pure metals than on its alloys, which chemical and phase composition is more complex.