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Caen, France

Gordin D.M.,INSA Rennes | Busardo D.,Quertech Ingenierie | Cimpean A.,University of Bucharest | Vasilescu C.,Institute of Physical Chemistry Ilie Murgulescu | And 5 more authors.
Materials Science and Engineering C | Year: 2013

In this study, a superelastic Ni-free Ti-based biomedical alloy was treated in surface by the implantation of nitrogen ions for the first time. The N-implanted surface was characterized by X-ray diffraction, X-ray photoelectron spectroscopy, and secondary ion mass spectroscopy, and the superficial mechanical properties were evaluated by nano-indentation and by ball-on-disk tribological tests. To investigate the biocompatibility, the corrosion resistance of the N-implanted Ti alloy was evaluated in simulated body fluids (SBF) complemented by in-vitro cytocompatibility tests on human fetal osteoblasts. After implantation, surface analysis methods revealed the formation of a titanium-based nitride on the substrate surface. Consequently, an increase in superficial hardness and a significant reduction of friction coefficient were observed compared to the non-implanted sample. Also, a better corrosion resistance and a significant decrease in ion release rates have been obtained. Cell culture experiments indicated that the cytocompatibility of the N-implanted Ti alloy was superior to that of the corresponding non-treated sample. Thus, this new functional N-implanted titanium-based superelastic alloy presents the optimized properties that are required for various medical devices: superelasticity, high superficial mechanical properties, high corrosion resistance and excellent cytocompatibility. © 2013 Elsevier B.V.

Salles L.,University of Caen Lower Normandy | Reboul J.M.,University of Caen Lower Normandy | Busardo D.,Quertech Ingenierie | Boudart B.,University of Caen Lower Normandy
Proceedings - International Symposium on Electrets | Year: 2011

Ions implantation is a process which consists in a modification of the superficial composition of the materials. One particular application consists in providing antistatic properties to polymers. We present three wires surface resistance measurements on ions implanted polycarbonate (PC). An investigation has been realized using different doses and different gaseous elements (N, He, Ar) for the ion beam generation. A strong decrease of surface resistance has been observed depending on the dose and the polymer. © 2011 IEEE.

Pierret C.,CNRS Center for Research on Ions, Materials and Photonics | Maunoury L.,French Atomic Energy Commission | Monnet I.,CNRS Center for Research on Ions, Materials and Photonics | Bouffard S.,CNRS Center for Research on Ions, Materials and Photonics | And 5 more authors.
Wear | Year: 2014

Carbon implantation into titanium is known to enhance some of its surface properties like wear behavior, mechanical hardness or the friction coefficient. Therefore the method is a candidate to be applied as a powerful surface engineering tool for titanium alloys. Recently, a new implantation technique has been developed, which is based on a compact particle accelerator device that is easy to handle. The device allows simultaneous multi-charged ion-implantation (from C+ up to C4+) in order to get a plateau like implantation profile based on the energetic distribution. The aim of this study is to investigate microstructural modifications of the near surface region of Ti-6Al-4V due to this processing technology and to enhance the surface performance. Nanoindentation and tribological measurements revealed a threshold of critical C contents where friction coefficient and wear are significantly reduced. Furthermore, these enhancements have been correlated to the presence of additional graphitic carbon. © 2014 Elsevier B.V.

Quertech Ingenierie | Date: 2011-07-01

A treatment method for treating at least one surface of a solid polymer part wherein multi-energy ions X

A method of grafting monomers (M) in a deep layer (

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