Abstract
Under tribological conditions in aqueous medium, the contact of materials does involve some degradations of materials. Especially friction under small reciprocal displacement, i.e., fretting corrosion, is occurring; this topic has been highlighted since the 80′s regarding hip implants. Hip prosthesis is assembled from three parts: femoral stem, neck and head. Fretting corrosion or friction corrosion between metallic parts first involves some degradation of the oxides layers. This step is governed by mechanics and it is related to some few minutes. Afterwards the corrosion occurrs enhanced by mechanical degradation. As well focused some oxides and some metallic ions are related to biocompatibility issues. Some strategies are available in order to avoid metal against metal friction and/or fretting. Some hard coatings and some smooth coatings were investigated. The first one is diamond-like carbon (DLC), and the second is a polyetheretherketone (PEEK), polymeric one. The investigations were focused on fretting corrosion solicitations of Ti-6Al-4V vs. Ti-6Al-4V + coating. DLC as a coating delays the corrosion degradation. The PEEK coating does not promote any corrosion degradation of the metallic counter part and more generally any wear.
Highlights
IntroductionOne neck and every hip component related to Femoral bone every patient anatomy does appear to be the sustainable way
Two coatings will be investigated through this work: diamond-like carbon (DLC) and polyetheretherketone (PEEK)
Concerning some PEEK coatings, the voltage should be decreased because of some insulating characteristics related to the PEEK material
Summary
One neck and every hip component related to Femoral bone every patient anatomy does appear to be the sustainable way. Somedisassembling, surface peaks (small area), issue; some small relative displacements will occur on every metallic junction, i.e., the contact stress may reach some GPa. Due to metal plasticity the mechanical properties onfew of microns. Total the hipones joints are immersed physiological liquid protein thedozens top surface should be different from related to the bulkamong material. The mechanical some micro relative displacements may occur This last phenomenon is not predominant through properties are quite different, 115 GPa concerning the Ti-6Al-4V and 200 GPa concerning the 316L the machining expertise of some manufacturers. In order to face this issue, some researchers took into account the coating impact on one material involved in the metallic junction
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