Towards near-permanent CoCrMo prosthesis surface by combining micro-texturing and low temperature plasma carburising - Dong, Yangchun; Svoboda, Petr; Vrbka, Martin; Kostal, David; Urban, Filip; Cizek, Jan; Roupcova, Pavla; Dong, Hanshan; Krupka, Ivan; Hartl, Martin (Journal of the mechanical behavior of biomedical materials, 2015)
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.
Keywords: Engineering; povrchové vlastnosti; Hot Temperature; Mechanical Phenomena; Plasma Gases; Vitallium; studie proveditelnosti; mechanické jevy; kyčelní protézy; Feasibility Studies; Friction; vysoká teplota; plazmové plyny; Surface Properties; Hip Prosthesis; vitalium; tření; inženýrství