Ti6Al4V coating with B2O3 and Al2O3 containing hydroxyapatite by HVOF technique

Calcium phosphates (Ca-P) based bioceramics have proved to be alluring materials for biomedical applications. Among them, hydroxyapatite (HA), Ca-10(PO4)(6)(OH)(2), is the most frequently used bioceramic. Due to its favorable properties and biocompatibility, HA-coated Ti6Al4V alloy has become one of the most interesting implant materials for orthopedic and dental applications. High-Velocity Oxy Fuel (HVOF) is a method employed to coat metallic implants such as titanium (Ti) and its alloy (Ti6Al4V) with hydroxyapatite (HA). In this study, decreasing the crack occurrence and increasing adhesion strength were investigated. For this purpose, nano sized HA, alumina (Al2O3) doped HA, and Boron oxide (B2O3) doped HA powders were produced by sol-gel process. First, a series of HA/Al2O3, HA/B2O3 coatings were deposited on Ti6Al4V substrate by HVOF method. Powders were tested by Fourier-Transform Infrared (FTIR) and X-Ray Diffraction (XRD). Morphology of specimens was characterized by Scanning Electron Microscopy (SEM-EDX). Adhesion strength of specimens was found to be affected by increase in the amounts of Al2O3 and B2O3 in HA. Furthermore, water contact angles of surface were decreased with increase in the amounts of Al2O3 and B2O3 in HA. This coating surface was expected to combine the advantages of Ca-P application and improve adhesion strength. (C) 2019 Sharif University of Technology. All rights reserved.