Development and characterization of plasma electrolytic oxidation containing hydroxyapatite coating on selective laser melted Ti6Al4V porous scaffold
Document Type
Article
Publication Date
7-1-2024
Abstract
Ti6Al4V porous scaffolds are designed and fabricated to solve the elastic modulus mismatch between bone and an implant. Bioactive coating is applied on the surface of the implant to improve biocompatibility of titanium implants and form chemical bonds with surrounding bone. Therefore, this study aims to develop a bio-functional coating on Selective Laser Melting (SLM) manufactured porous Ti6Al4V scaffold produced using plasma electrolytic oxidation technique (PEO). Hydroxyapatite (HAp) and fluorapatite (FAp) were formed on the scaffold surface and field emission scanning electron microscopy (FESEM) was used to study the surface morphology and thickness of the coating. The chemical composition of the coatings was investigated by using an energy dispersive spectroscopy (EDS), X-ray diffractometer (XRD), and X-ray photoelectron spectroscopy (XPS). The coating formation was non-homogeneous with Ca/P ratio range of 1.24 to 1.41, approaching ratio of tricalcium phosphate compound. In vitro bioactivity test using a simulated body fluid (SBF) was conducted and the apatite formation on the coating was analyzed. PEO coatings on Ti6Al4V SLM-manufactured porous scaffolds containing fluoride and calcium salt have shown good bioactivity with the apatite formation that can be observed on all coated scaffolds. It was concluded that the combination of bio-functional coating on the surface of the SLMmanufactured porous scaffold provides synergistic effects, which was beneficial in improving the biocompatibility of orthopedic porous metallic implants. Hence, SLM-PEO approach potentially can be adapted to develop a bioactive titanium implant with tunable mechanical properties for orthopedic applications.
Keywords
Ti6Al4V porous scaffold, Selective laser melting, Plasma electrolytic oxidation, Bioactive coating, Hydroxyapatite, Surface engineering
Divisions
fac_eng
Funders
Japan International Cooperation Agency (JICA) via JICA Innovative Asia Program
Publication Title
Surface & Coatings Technology
Volume
488
Publisher
Elsevier
Publisher Location
PO BOX 564, 1001 LAUSANNE, SWITZERLAND