Effect of surface modifications of additively manufactured Ti-6Al-4V alloys on apatite formation ability for biomedical applications


DEMİRCİ S. , DALMIŞ R., DİKİCİ T., TÜNÇAY M. M. , KAYA N., GÜLLÜOĞLU A. N.

JOURNAL OF ALLOYS AND COMPOUNDS, vol.887, 2021 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 887
  • Publication Date: 2021
  • Doi Number: 10.1016/j.jallcom.2021.161445
  • Title of Journal : JOURNAL OF ALLOYS AND COMPOUNDS
  • Keywords: Additive manufacturing, Direct metal laser sintering, Ti-6Al-4V, Surface modification, Bioactivity, PLASMA ELECTROLYTIC OXIDATION, DIRECT METAL LASER, CORROSION BEHAVIOR, POROUS TITANIUM, COATINGS, MICROSTRUCTURE, TI6AL4V, FUNCTIONALIZATION, HYDROXYAPATITE, BIOACTIVITY

Abstract

In this study, Ti-6Al-4V alloys were additively manufactured (AM) with different laser powers. The goal was to investigate the effect of different surface modifications on apatite formation ability. Four types of surface modifications, namely, sandblasting (S), acid etching (E), anodic oxidation (AO) and anodic spark oxidation (ASO), were achieved on the Ti-6Al-4V samples. The microstructure, phase, morphology, roughness and wettability properties were examined by optical microscope (OM), scanning electron microscope (SEM), Xray diffraction (XRD), surface profilometer and contact angle techniques. The bioactivity analysis was performed in simulated body fluid (SBF) for 2 weeks. The results indicated that the microstructure, surface topography, roughness and wettability influenced the apatite formation were affected by the production laser power. Generally, the samples 3 showed higher Ca and P ion ratio value because of percentage of beta phase amount, the presence of bioactive phases on the surfaces. The E3 sample resulted in the best apatite formation theoretically. The etching procedure of AM Ti-6Al-4V in the acidic solution can be applied to improve the apatite formation ability of Ti-6Al-4V alloys. (c) 2021 Elsevier B.V. All rights reserved.