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Jamali, Sina
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article
Cytocompatible tantalum films on Ti6Al4V substrate by filtered cathodic vacuum arc deposition
Abstract
Tantalum filmswere deposited on negatively biased Ti6Al4V substrates using filtered cathodic vacuum arc deposition to enhance the corrosion resistance of the Ti6Al4V alloy. The effect of substrate voltage bias on the microstructure, mechanical and corrosion properties was examined and the cytocompatibility of the deposited films was verified with mammalian cell culturing. The Ta films deposited with substrate bias of −100 V and −200 V show a mixture of predominantly β phase and minority of α phase. The Ta/−100 V film shows adhesive failure at the Ti/Ta interface and a cohesive fracture is observed in Ta/−200 V film. The Ta/−100 V showed a significant improvement in corrosion resistance, which is attributed to the stable oxide layer. The in-vitro cytocompatibility of the materials was investigated using rat bone mesenchymal stem cells, and the results show that the Ta films have no adverse effect on mammalian cell adhesion and spreading proliferation.