COMPARATIVE STUDY OF HYDROXYAPATITE COATING PRODUCED WITH PLASMA ELECTROLYTIC OXIDATION AND HYDROTHERMAL TREATMENT ON TITANIUM ALLOYS: Ti-6Al-4V AND Ti-6Al-7Nb FOR DENTAL IMPLANTS
Titanium and Titanium alloys are considered perfect materials for human body applications such as artificial joints and dental implants. A very common alloy used for dental implants is Ti-6Al-4V with its good mechanical properties and corrosion resistance, although there are undecidable questions regarding toxic vanadium and its influence on the human body. Following this concern, other titanium alloys containing no vanadium and retaining suitable properties are used.
The motivation for this comparative study is to attain HA (hydroxyapatite) coating which is a major component in human bone and its presence contributes to osteointegration, on two titanium alloys.
In this study Ti-6Al-4V and Ti-6Al-7Nb were coated in a water solution of calcium acetate (Ca(CH3COO)2) and calcium glycerophosphate (Ca(PO4CH(CH2OH)2) by PEO (Plasma Electrolytic Oxidation) for 20 minutes and later were hydrothermally treated (HTT) in water (pH=7) for 2 hours at 200°C in a pressurized reactor. The surface morphologies, elemental composition and phase components were characterized by Scanning Electron Microscopy, Energy Dispersive Spectroscopy and X-Ray Diffraction, respectively.
It was found that the coating on Ti-6Al-4V contains rutile, anatase and Ca3(PO4)2 after both PEO and HTT. The coating on Ti-6Al-7Nb after PEO contains rutile and anatase and after HTT is also contains HA. Plate shaped HA crystals formed on Ti-6Al-7Nb produce a developed surface.
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