Abstract
Abstract Knee implant are mostly made of titanium alloy femoral component and ultra-high molecular weight polyethylene (UHMWPE) tibial insert. Wear and friction are the main problems of knee implant. Surface treatments, such as cryogenic and coating influence friction and wear of contacting parts. The aim of this paper is to investigate the effect of coating materials and cryogenic process on surface hardness, friction and wear characteristics between titanium alloy femoral component and UHMWPE tibial insert. It is also desirable to achieve the lowest friction and wear of the knee joint components. The friction and wear experiments were carried out on a pin-on-disc testing machine according to G99 standard under dry condition using the speed of 120 rpm and total sliding distance of 250 m. In this study, titanium alloy pins were treated with cryogenic process for 24 hours and coated with diamond-like carbon (DLC) and titanium-nitride(TiN). The disc material was medical grade UHMWPE GUR1020 produced by extrusion mixer and hot-press process. Hardness and surface roughness testing and morphological observations were performed on specimens before and after the wear testing experiments. Friction coefficient and wear volume were measured at regular intervals. DLC coating exhibited the highest friction coefficient of all treatments. The results indicated that the TiN coating on titanium alloy exhibited lower friction coefficient and wear volume of both titanium alloy pins and UHMWPE + 2% CNT disc than that of the uncoated, 24 hr-cryogenic and DLC coating.
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