Abstract
A hybrid process that combines oxidation under glow-discharge conditions with ion beam-assisted deposition (IBAD) has been applied to mechanically polished NiTi shape memory alloy in order to produce composite surface layers consisting of a TiO2 layer and an external carbon coating with an addition of silver. The produced surface layers a-C(Ag) + TiO2 type have shown increased surface roughness, improved corrosion resistance, altered wettability, and surface free energy, as well as reduced platelet adhesion, aggregation, and activation in comparison to NiTi alloy in initial state. Such characteristics can be of great benefit for cardiac applications.
Highlights
Rising demand for cardiovascular implants makes it necessary to develop new material solutions to meet surgical procedures, shorten the time of tissue healing and patient recovery, as well as to minimize post-surgical complications
A silver nanoparticle-enriched amorphous carbon coating was produced on the oxidized layer via dual beam ion beamassisted deposition (IBAD)
From transmission electron microscope observations comes that the hybrid layer produced on NiTi shape memory alloy is an a-C(Ag) + TiO2 type (Fig. 1a)
Summary
Rising demand for cardiovascular implants makes it necessary to develop new material solutions to meet surgical procedures, shorten the time of tissue healing and patient recovery, as well as to minimize post-surgical complications. NiTi shape memory alloy is a self passivating material with relatively good corrosion resistance due to the thin layers of titanium oxide spontaneously produced on the alloy’s surface [6, 7]. They are insufficient in providing adequate protection when used in medical implants [8, 9] because of their fragility and poor 110 Page 2 of 9. It was noted that above 300 °C, precipitations of the Ni4Ti3 phase are observed in the alloy structure, that affects shape memory and superelasticity [20]
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