Sputtered Si and Mg doped hydroxyapatite for biomedical applications

View/ Open
Date
2018-01-30Author
Abdulgader, Radwan
Monsees, Thomas K.
Metadata
Show full item recordAbstract
Hydroxyapatite (HAP) coatings are applied on metallic implant materials to combine mechanical
properties of metallic material with bioactivity abilities of HAP ceramic. In this study, HAP coatings
with additions of Si and Mg are proposed to be deposited on Ti6Al4V substrates by RF magnetron
sputtering. Chemical bonding, morphology, topography and corrosion resistance in simulated body
fluids(SBF) of the coatings were investigated. Additionally, mechanical and biological properties of
the coatings were evaluated. It was found that the addition of Si and Mg does not influence the
formation of a HAP phase. All the coatings exhibited smooth surface and uniform growth, without
defects or cracks. Both hardness and elastic modulus of the coated samples decrease with Mg addition
in the HAP-Si structure. Both Mg and Si addition into HAP coatings were found to enhance the
corrosion resistance of the Ti6Al4V alloy in the SBF solution. Coatings with low Mg content exhibited
better corrosion performance. All the coatings investigated were biocompatible, as demonstrated by
SaOS-2 bone cell attachment and growth. However, cell proliferation and morphology were inferior
on samples with the highest Mg content.