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Hybrid a-CNH+TiO 2 +TiN-type surface layers produced on NiTi shape memory alloy for cardiovascular applications.

Nanomedicine 2017 September
AIM: The goal was to improve the properties of NiTi shape memory alloy to make it suitable for cardiac applications. For this purpose, a hybrid a-CNH+TiO2 +TiN-type surface layer was produced on NiTi alloy and characterized.

MATERIALS & METHODS: The NiTi alloy subjected to hybrid process combining low-temperature oxynitriding under glow discharge conditions and radio frequency chemical vapor deposition process was examined for microstructure, surface topography, corrosion resistance, wettability and surface-free energy, Ni ion release and platelets adhesion, aggregation and activation.

RESULTS: The hybrid surface layers showed slightly increased surface roughness, better corrosion resistance, a more hydrophobic nature, decreased surface free energy, smaller release of nickel ions and reduced platelets activation.

CONCLUSION: The produced layers could expand the range of NiTi medical applications.

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