Surface Characteristics of TiN and HA Coated Ti-30Nb-xTa Alloys for Biomaterials

Hydroxyapatite has been widely used as coating materials for dental orthopedic implants for many years, due to its close similarity of chemical composition and high biocompatibility with natural bone tissue. In addition, titanium nitride (TiN) has been reported to enhance the corrosion resistance and biocompatibility on the surface. Biocompatibility of titanium nitride (TiN) and hydroxyapatite (HA) multilayer on the Ti-30Nb-xTa (x = 0, 7 wt. %) alloys by coated RF sputtering was investigated in order to improve the corrosion resistance and biocompatibility. The corrosion resistance and biocompatibility of Ti-30Nb-xTa alloys were evaluated by potentiodynamic test and wettability test. Field-emission scanning electron microscope (FE-SEM) and energy dispersive X-ray spectroscopy (EDS) were used to evaluate the morphology of the coated samples. The phase and microstructure of Ti-30Nb-xTa alloys were investigated by using an X-ray diffractometer (XRD) and optical microscopy (OM). The microstructure of Ti-30Nb-xTa alloys changed α’’-phase to β-phase with Ta content. Also, HA coated Ti-30Nb-xTa alloys surface observed the low contact angle and good wettability for biocomatibility.

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