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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 10 μm 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 530 nm, indicating that the additional lubricant during sliding motion might provide exceptional bearing life.
|Journal||Journal of the Mechanical Behavior of Biomedical Materials|
|Early online date||1 Nov 2015|
|Publication status||Published - 1 Mar 2016|
- Plasma carburising
- Surface texturing
- Colorimetric interferometry