Comportements mécaniques et tribologiques du Ti-6Al-4V traité par implantation d'ions carbone et oxygène multichargés. Développement des moyens associés

Abstract : Carbon and oxygen implantation into titanium is known to enhance some of its superficial properties (wear, hardness, friction coefficient), and so, can be applied as a powerful surface treatment for titanium alloys. These investigations were undertaken thanks to a recent technical implantation innovation. It consists in using a tiny particle microaccelerator (made of a small ECR ion source) allowing multicharged ion-implantation (up to C4+ and O4+). The aim of the study was, first, to produce multicharged carbon ion beam using a micro mass-spectrometer which had to be designed and developed during this thesis. Microstructural modifications by carbon and oxygen ion implantation into Ti-6Al-4V alloys were investigated. Nanoindentation and tribological measurements were also performed and have revealed a threshold within the implantation fluence range above which tribological properties are increasingly improved. This enhancement is mainly due to the presence of graphitic carbon clusters and amorphous carbon. Moreover, it has been proved that simultaneous oxygen-carbon implantation limits quickly and drastically the awaited improvement of the tribological properties and consequently
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Materials Science. Université de Caen, 2011. French


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Submitted on : Thursday, February 2, 2012 - 7:15:55 PM
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Christophe Pierret. Comportements mécaniques et tribologiques du Ti-6Al-4V traité par implantation d'ions carbone et oxygène multichargés. Développement des moyens associés. Materials Science. Université de Caen, 2011. French. <tel-00665845>

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