Towards near-permanent CoCrMo prosthesis surface by combining micro-texturing and low temperature plasma carburising

An advanced surface engineering process combining micro-texture with a plasma carburising process was produced on CoCrMo femoral head, and their tribological properties were evaluated by the cutting-edge pendulum hip joint simulator coupled with thin film colorimetric interferometry. FESEM and GDOES...

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Bibliographic Details
Published in:Journal of the mechanical behavior of biomedical materials 2016-03, Vol.55, p.215-227
Main Authors: Dong, Yangchun, Svoboda, Petr, Vrbka, Martin, Kostal, David, Urban, Filip, Cizek, Jan, Roupcova, Pavla, Dong, Hanshan, Krupka, Ivan, Hartl, Martin
Format: Article
Language:English
Subjects:
Biotribology
Colorimetric interferometry
Engineering - methods
Feasibility Studies
Friction
Hip Prosthesis
Hot Temperature
Mechanical Phenomena
Plasma carburising
Plasma Gases
Surface Properties
Surface texturing
Vitallium - chemistry
Wear
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Summary:An advanced surface engineering process combining micro-texture with a plasma carburising process was produced on CoCrMo femoral head, and their tribological properties were evaluated by the cutting-edge pendulum hip joint simulator coupled with thin film colorimetric interferometry. FESEM and GDOES showed that precipitation-free C S-phase with a uniform case depth of 10μm was formed across the micro-textures after duplex treatment. Hip simulator tests showed that the friction coefficient was reduced by 20% for micro-metre sized texture, and the long-term tribological property of microtexture was enhanced by the C-supersaturated crystalline microstructure formed on the surface of duplex treated CoCrMo, thereby enhancing biotribological durability significantly. In-situ colorimetric interferometry confirmed that the maximum film thickness around texture area was 530nm, indicating that the additional lubricant during sliding motion might provide exceptional bearing life. [Display omitted] •An innovative duplex surface treatment (micro-texturing and S-phase) was developed.•In-situ visualisation of lubricating films on real geometry head and cup.•Lubricating film thickness was increased by surface texturing on CoCrMo head.•Testing time-dependant performance of dimpled surface and its longevity.•Study of frictional behaviour of MoP joints with different texture geometries.
ISSN:1751-6161
1878-0180
DOI:10.1016/j.jmbbm.2015.10.023