Effect of Surface Roughness Ti6Al4V Modified by Hydroxyapatite Coating

Abstract

Several studies have described the use of HAp layers on titanium alloys in the recent years. Among the methods of strengthening the adherence of such layers, which call the researchers’ attention, there is the development of coating by sol-gel type techniques. Coatings of HAp on the alloy of Ti6Al4V allow the formation of uniform layers, with controlled porosity and better adhesion and with properties required for its use as orthopaedic implants. In this paper, samples of Ti6Al4V alloy were used as substrates with different surface roughness, coated with HAp layers that were deposited by a spin-coating technique, using a solution obtained by the sol-gel method. The layers have good homogeneity and good adhesion to the substrate, where stability and uniformity observes for Hap_250 and Hap_110 compared with Hap_29 and Hap_45, that indicate to the importance of surface roughness. Therefore, the biological characterization was investigated, including the film stability in the Simulated Body Fluid (SBF) and the antimicrobial activity of Ti6Al4V alloys coated with hydroxyapatite. Also, the biofilm formation by P. aeruginosa species was evaluated. The morphology and structure of the films were performed by scanning electron microscopy (SEM) and X-ray diffraction (XRD).

Keywords

• Hydroxyapatite
• thin film
• Ti6Al4V alloy
• XRD
• SEM