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Turnu Măgurele, Romania

Braic V.,Institute for Optoelectronics | Balaceanu M.,Institute for Optoelectronics | Braic M.,Institute for Optoelectronics | Vitelaru C.,Institute for Optoelectronics | And 6 more authors.
Journal of Materials Engineering and Performance | Year: 2014

The Ti-10Nb-10Zr-5Ta alloy, prepared in a levitation melting furnace, was investigated as a possible candidate for replacing Ti6Al4V alloy in medical applications. The sessile drop method, pin-on-disc and in vitro tests were used to analyze wettability, wear resistance, and biocompatibility of the new alloy. The characteristics of the Ti-10Nb-10Zr-5Ta alloy were assessed in comparison to those of the Ti6Al4V alloy. The Ti-10Nb-10Zr-5Ta system was found to have hydrophilic characteristics with similar contact angle as the Ti6Al4V alloy. In all environments (deionized water, simulated body fluid and Fusayama Meyer artificial saliva), the friction coefficient showed a stable evolution versus sliding distance, being similar for both alloys. On overall, the wear resistance of Ti-10Nb-10Zr-5Ta alloy was lower than that of Ti6Al4V for all testing environments. The Ti-10Nb-10Zr-5Ta alloy exhibited good biocompatibility characteristics at in vitro test compared to Ti6Al4V alloy. The cell viability on Ti-10Nb-10Zr-5Ta surfaces was higher than the one observed on Ti6Al4V samples, regardless the number of days spent in osteoblast-like cells culture. A high degree of cell attachment and spreading was observed on both alloys. © ASM International.

Parau A.C.,Institute for Optoelectronics | Parau A.C.,Polytechnic University of Bucharest | Kiss A.E.,Institute for Optoelectronics | Braic V.,Institute for Optoelectronics | And 3 more authors.
Journal of Optoelectronics and Advanced Materials | Year: 2012

The hydroxyapatite (HAP) ceramic, widely used as a biological active coating for the metallic implants in arthroplasty, presents different characteristics depending on the synthesis process. The surface characteristics such as its surface chemistry, surface energy, topography and roughness are important properties to be determined when considering the use of an implant. In the present work, the magnetron sputtering deposition method was used to deposit HAP coatings on Ti6Al4V alloy, in order to investigate the effect of thermal treatment on their surface roughness and wettability. The coatings were investigated for their composition and crystallographic structure by EDX, FT-IR and XRD, as well for their surface morphology by SEM and stylus based surface profilometry. The assessment of the wettability was done by using the sessile drop method, the contact angles for various liquids, the surface free energy and the work of adhesion on water being determined. After annealing the HAP coatings became crystalline, preserved their elemental composition, but exhibited different surface roughness and work of adhesion on water.

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