Laser surface deposition of niobium and titanium-niobium on Ti6A14V substrates for biomedical applications.
Pityana, S.L. Baloyi, N. Tlotleng, M. Popoola, P.
Pityana, S.L.
Baloyi, N.
Tlotleng, M.
Popoola, P.
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Abstract
The advantages of using Nb and Ti-Nb coatings for improving the hardness and corrosion resistance of Ti6Al4V were investigated. It has been reported that Ti6Al4V used in orthopaedic implants tends to release toxic Al and V ions into the surrounding tissue. Thin layers of Nb and Ti-Nb were deposited on Ti6Al4V substrates using a laser metal deposition technique. The deposited material was analysed using optical microscopy, scanning electron microscopy coupled with energy dispersive spectroscopy, and X-ray diffraction. The corrosion behaviour of the deposited layers was investigated using a Metrohm Autolab PG Stat101 compact potentiostat at 25°C in simulated body fluid. A Vickers hardness system was used to
study the mechanical properties. Both Nb and Ti-Nb coatings exhibited good metallurgical bonding with the substrate. The microstructure and the XRD analyses for the Nb system showed that the _-Nb phase was most dominant, while the Ti-Nb system comprised a mixture of the _ and ` phases. The average hardness of the Ti6Al4V substrate was 350 HV0.3, with a slight increase for the Nb coating (363 HV0.3) and a much higher hardness from the Ti-Nb coating at 423 HV0.3. The corrosion results show that the deposited Nb was more corrosion-resistant in the solution than either the Ti6Al4V substrate or the Ti-Nb coating.
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Date
2018-11-14
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The Southern African Institute of Mining and Metallurgy
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Keywords
Corrosion, Laser surface deposition, Niobium (Nb), Titanium (Ti), Titanium-niobium (Ti-Nb), Ti6Al4V