Berlin 2024 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 17: Organic Thin Films, Organic-Inorganic Interfaces
DS 17.6: Vortrag
Donnerstag, 21. März 2024, 16:15–16:30, A 060
Formation of CoSx in the tribological taper junction of hip implants — •Adrian Wittrock1, Christian Beckmann1, Markus A. Wimmer2, Alfons Fischer2,3, Christian Liebscher4, and Jörg Debus1 — 1Department of Physics, TU Dortmund University — 2Department of Orthopedic Surgery, Rush University Medical Center, Chicago, USA — 3Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH — 4Structure and Nano-/Micromechanics of Materials, Max-Planck-Institut für Eisenforschung GmbH
Within an artificial hip joint gross slip fretting corrosion occurs, leading to the formation of inorganic-organic tribomaterial which contains compounds of the human body fluid and wear particles from the implant materials. However, little is known about tribo-chemical and -structural processes and the types of organometallic species formed within hip-implant taper junctions. Using confocal Raman microscopy, we show that the tribological fretting gives rise to a denaturation of the albumin, associated with a breaking of sulphur bonds, so that - in turn - sulphur ions are released and react with cobalt ions from the Co-alloy of the hip implant. A thin tribofilm of amorphous/nanocrystalline CoSx is thus formed, covering approximately 12.2 % of the fretting track of the CoCr29Mo6C0.03 surface.
Keywords: fretting corrosion; Raman scattering; metal-serum interaction; self-formation tribofilm; taper junction