TiSZ-reinforced hydroxyapatite coatings on magnesium substrate with titanium interlayer

ABSTRACT

In this study, pure and 10% wt. Titania-Stabilised Zirconia (TiSZ) -reinforced Hydroxyapatite (HA) coatings were deposited on magnesium substrate using plasma spray as a single layer and double layer with an HVOF sprayed Ti bond coat. The coated specimens were characterised by X-ray diffraction (XRD) analysis, and scanning electron microscopy equipped with energy dispersive spectroscopy (SEM, EDS). Rockwell-C adhesion and scratch tests were performed. The corrosion behaviours in simulated body fluid (SBF) of coatings were investigated by an electrochemical corrosion test. Analyses confirmed successful coating with a dense titanium buffer layer. The double-layered HA-titanium combination offered superior corrosion resistance compared to single layers. While adding TiSZ enhanced adhesion, it compromised scratch resistance. The titanium bond coat had minimal impact on adhesion and cohesion behaviour of coatings.

KEYWORDS:

• Hydroxyapatite
• coating
• Titania-stabilised zirconia (TiSZ)-reinforced
• thermal spray
• magnesium substrate

Acknowledgement

This work was supported by the Scientific Research Projects Coordination Unit of Hakkari University, Grant number: FM2017BAP7.

Disclosure statement

No potential conflict of interest was reported by the author(s).