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Cotrut C.M.,Polytechnic University of Bucharest | Parau A.C.,Romanian National Institute for Optoelectronics | Gherghilescu A.I.,Polytechnic University of Bucharest | Titorencu I.,Institute of Cellular Biology and Pathology Nicolae Simionescu of the Romanian Academy | And 8 more authors.
Metals | Year: 2017

Compared to other alloys, Ti6Al4V is the most used in medicine. In recent years, concerns regarding the toxicity of Al and V elements found in the composition of Ti6Al4V have drawn the attention of the scientific community, due to the release of Al or V ions after long term exposure to human body fluids which can lead to a negative response of the human host. Based on this, the aim of the paper was to manufacture a Ti25Nb10Zr alloy consisting of biocompatible elements which can replace Ti6Al4V usage in medical applications. In order to prove that this alloy possessed improved properties, the mechanical, wear and corrosion resistance, wettability, and cell viability were performed in comparison with those of the Ti6Al4V alloy. The corrosion behavior of this new alloy in simulated body fluid (SBF) and Hank solutions is superior to that of Ti6Al4V. The cast Ti25Nb10Zr alloy has a good tribological performance in SBF, while annealed Ti25Nb10Zr alloy is better in Hank solution. Cell viability and proliferation assay after five days indicated that Ti25Nb10Zr presented a good viability and proliferation with values of approximately 7% and 10% higher, respectively, than the ones registered for pure Ti. When compared with Ti6Al4V, the obtained results for Ti25Nb10Zr indicated smaller values with 20% in the case of both tests. Overall, it can be concluded that cell proliferation and viability tests indicated that the biocompatibility of the Ti25Nb10Zr alloy is as good as pure Ti and Ti6Al4V alloy. © 2017 by the authors. Licensee MDPI, Basel, Switzerland.

Vasilescu C.,Institute of Physical Chemistry Ilie Murgulescu | Drob S.I.,Institute of Physical Chemistry Ilie Murgulescu | Osiceanu P.,Institute of Physical Chemistry Ilie Murgulescu | Drob P.,Institute of Physical Chemistry Ilie Murgulescu | And 4 more authors.
Metals and Materials International | Year: 2015

This paper describes the synthesis of a novel Ti-15Ta-5Zr alloy with an α + ß stable, homogeneous, biphasic microstructure (by optical microscopy, X-ray diffraction and scanning electron microscopy) and the determination of its mechanical properties, hardness and a Young’s modulus of 42.2 GPa. The alloy passive film composition and thickness were analyzed by X-ray photoelectron spectroscopy; a thick, compact native passive film containing the protective oxides of all constituent elements (TiO2, Ta2O5, ZrO2) was identified. The electrochemical parameters confirmed a nobler behaviour and a more capacitive, resistant passive film on the alloy surface compared to Ti and other existing implant alloys; these facts are due to the alloying elements that, by their oxides stabilize and reinforce the alloy passive film. This passive film thickened in time, which increased its protective capacity. The new alloy had no susceptibility to galvanic or local corrosion. Ti-15Ta-5Zr alloy is recommended as an advanced orthopaedic implant material. © 2015, The Korean Institute of Metals and Materials and Springer Science+Business Media Dordrecht.

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