کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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810656 | 1469100 | 2015 | 11 صفحه PDF | دانلود رایگان |
This study investigates a tribological performance of diamond like carbon (DLC) coated micro dimpled prosthesis heads against ceramic cups in a novel pendulum hip joint simulator. The simulator enables determining friction coefficient and viscous effects of a concave shaped specimen interface (conformal contact). Two types of DLC such as hydrogenated amorphous carbon (a-C:H) and tetrahedral amorphous carbon (Ta-C) and one set of micro dimple (diameter of 300 µm, depth of 70 µm, and pitch of 900 µm) were fabricated on metallic prosthesis heads. The experiment results reveal a significant friction coefficient reduction to the ‘dimpled a-C:H/ceramic’ prosthesis compared to a ‘Metal (CoCr)/ceramic’ prosthesis because of their improved material and surface properties and viscous effect. The post-experiment surface analysis displays that the dimpled a-C:H yielded a minor change in the surface roughness, and generated a larger sizes of wear debris (40–200 nm sized, equivalent diameter), a size which could be certainly stored in the dimple, thus likely to reducing their possible third body abrasive wear rate. Thus, dimpled a:C–H can be used as a ‘metal on ceramic hip joint interface’, whereas the simulator can be utilized as an advanced bio-tribometer.
Journal: Journal of the Mechanical Behavior of Biomedical Materials - Volume 45, May 2015, Pages 121–131