Abstract
SiC- and Ag-SiC-doped hydroxyapatite (HA) coatings were deposited via magnetron sputtering aiming at increased corrosion protection of Ti-10Nb-10Zr-5Ta alloy in simulated body fluid environment and superior mechanical properties compared to plain hydroxyapatite. The coatings had a total thickness of about 350 nm. The X ray diffraction patterns indicate that HA coatings are polycrystalline with a hexagonal structure and the addition of SiC determined the coating amorphization. All coatings presented a lower roughness compared to the Ti alloy and were hydrophilic. Ag-SiC-HA coating presented the best corrosion resistance and tribological parameters. All coatings were biocompatible, as ascertained via indirect cytocompatibility studies conducted on Vero cells.
Highlights
Despite significant improvements in the development of biomaterials aimed at improving their durability, medical implants are not yet perfect
The present work is justified by the results reported in the last 15 years, which demonstrated that the most important causes of implant loosening are due to reduced osseointegration, implant friction, abrasive wear and infection [1,3,26,29]
The HA and doped HA coatings were produced via a RF magnetron sputtering method using a magnetron deposition system equipped with 5 cathodes (2.54 cm diameter), arranged in a confocal configuration—ATC ORION (AJA International Inc., Scituate, MA, USA)
Summary
Despite significant improvements in the development of biomaterials aimed at improving their durability, medical implants are not yet perfect. The traditional materials used for implants for hip, knee, shoulder and intervertebral disk replacement (stainless steel 316, Co-Cr alloys, Ti and its alloys, ceramics, polyethylene and polyurethane) have good mechanical properties and high load carrying capacity. Their surfaces are bio-inert but exhibit limited ability to bond and interlock with adjacent bone, such as their reduced resistance to interfacial shearing forces causes implant loosening [1,2,3]. Bone’s Young’s modulus is quite low (7–30 GPa) [1,6]
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