Quertech Ingenierie

Sainte-Foy-lès-Lyon, France

Quertech Ingenierie

Sainte-Foy-lès-Lyon, France
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Hervier A.,French National Center for Scientific Research | Aureau D.,French National Center for Scientific Research | Woytasik M.,University Paris - Sud | Plante M.-P.,University Paris - Sud | And 3 more authors.
Journal of the Electrochemical Society | Year: 2014

The effect of high energy ion bombardment on ultra-thin Pt films deposited on silicon substrates was investigated. The changes caused by the bombardment were studied using a combined characterization approach, consisting of X-Ray Photoelectron Spectroscopy (XPS) and electrochemical measurements. The chemical sensitivity of XPS helped determine locally the nature of the film after bombardment, which transitions to platinum silicide, as demonstrated by a dramatic evolution of the Pt4f and valence band spectra. Cyclic voltammetry provided the average electrochemical response of the entire sample surface (1 cm2) in contact with an acidic solution. This technique is particularly sensitive to the evolution of the platinum undergoing bombardment. Initially showing a typical Pt electrochemical response, the film undergoes an irreversible transformation, leading to the absence of any metallic platinum on the surface after a sufficient bombardment dose, based on the absence of electrocatalytic activity. This study highlights the complementarity of XPS and electrochemical characterization. The platinum silicide fabrication technique described here may also be of interest for electronics applications, since platinum silicide contacts are used in a variety of thin film devices. © 2014 The Electrochemical Society. All rights reserved.

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.

Gordin D.M.,INSA Rennes | Gloriant T.,INSA Rennes | Chane-Pane V.,Quertech Ingenierie | Busardo D.,Quertech Ingenierie | And 5 more authors.
Journal of Materials Science: Materials in Medicine | Year: 2012

In this study, the new Hardion+ microimplanter technology was used to modify surface properties of biomedical pure titanium (CP-Ti) and Ti-6Al-4V ELI alloy by implantation of nitrogen ions. This process is based on the use of an electron cyclotron resonance ion source to produce a multienergetic ion beam from multicharged ions. After implantation, surface analysis methods revealed the formation of titanium nitride (TiN) on the substrate surfaces. An increase in superficial hardness and a significant reduction of friction coefficient were observed for both materials when compared to non-implanted samples. Better corrosion resistance and a significant decrease in ion release rates were observed for N-implanted biomaterials due to the formation of the protective TiN layer on their surfaces. In vitro tests performed on human fetal osteoblasts indicated that the cytocompatibility of N-implanted CP-Ti and Ti-6Al-4V alloy was enhanced in comparison to that of the corresponding non treated samples. Consequently, Hardion+ implantation technique can provide titanium alloys with better qualities in terms of corrosion resistance, cell proliferation, adhesion and viability. © Springer Science+Business Media, LLC 2012.

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.

Hoche D.,Helmholtz Center Geesthacht | Blawert C.,Helmholtz Center Geesthacht | Cavellier M.,Quertech Ingenierie | Cavellier M.,INSA Rennes | And 2 more authors.
Applied Surface Science | Year: 2011

Nitrogen implantation technique (Hardion+) has been applied in order to modify the surface properties of magnesium and Mg-based alloys (AM50, AZ31). Nitrogen ions with an energy of approximately 100 keV were used to form the Mg3N2 phase leading to improved surface properties. The samples were investigated using various characterization methods. Mechanical properties have been tested by means of nanoindention, the electrochemical behavior was measured by potentiodynamic polarization and impedance spectroscopy, phase formation by using grazing incidence Xray diffraction, the chemical state was determined by means of Xray induced photoelectron spectroscopy (XPS) and depth profiling by using secondary ions mass spectroscopy (SIMS). Additionally, the results were compared to calculated depth profiles using SRIM2008. The correlation of the results shows the nitride formation behavior to a depth of about 600 nm. © 2011 Elsevier B.V. All rights reserved.

The invention relates to a method for treating at least one surface of a solid elastomer part using helium ions. According to the invention, multi-energy ions He^(+) and He^(2+) are implanted simultaneously, and the ratio RHe, where RHe=HeVHe^(2+) with He^(+) et He^(2+) expressed in atomic percentage, is less than or equal to 100, for example less than 20, resulting in very significant reductions in the frictional properties of parts treated in this way. The He^(+) and He^(2+) ions are supplied, for example, by an ECR source.

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^(+) and X^(2+) are implanted simultaneously, where X is the atomic symbol selected from the list constituted by helium (He), nitrogen (N), oxygen (O), neon (Ne), argon (Ar), krypton (Kr), and xenon (Xe), and wherein the ratio RX, where RX=X^(+)/X^(2+), with X^(+) and X^(2+) expressed as atomic percentages, is less than or equal to 100, for example less than 20. This results in very significant reductions in the surface resistivity of the parts treated in this way, the appearance of antistatic properties or of electrostatic charge dissipation properties. By way of example, the ions X^(+) and X^(2+) are supplied by an ECR source.

A method of grafting monomers (M) in a deep layer (1) in an organic material by using an ion beam (X), wherein the ion dose per unit area is selected so as to be in the range of 10^(12 )ions/cm^(2 )to 10^(18 )ions/cm^(2 )so as to create a reservoir of free radicals (1) within a large thickness in the range 0 nm to 3000 nm. Hydrophilic and/or hydrophobic and/or antibacterial monomers (M) are grafted in the reservoir of free radicals (1). Organic materials with hydrophobic, hydrophilic, and/or antibacterial properties that are effective for long-term use are thus advantageously obtained.

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