Nano Archive

Wear resistance of highly cross-linked and remelted polyethylenes after ion implantation and accelerated ageing

Medel, F. J. and Puertolas, J. A. (2008) Wear resistance of highly cross-linked and remelted polyethylenes after ion implantation and accelerated ageing. PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART H-JOURNAL OF ENGINEERING IN MEDICINE, 222 (H6). pp. 877-885. ISSN 0954-4119

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Official URL: http://journals.pepublishing.com/content/l1k023p84...

Abstract

Ion implantation may provide medical polyethylenes with excellent mechanical and tribological properties, helping to lower the risk of long-term osteolysis. Highly crosslinked and remelted polyethylenes, materials currently used as soft components in artificial joints, were implanted with N+ and He+ ions at different ion fluences. The mechanical and tribological properties under distilled water lubrication at body temperature were assessed after ion implantation by means of microhardness and pin-on-disc tests respectively. Thus, the influences of the ionic species and implantation dose on surface hardness, friction coefficient, and wear factor were fully characterized. Furthermore, the tribological behaviour was evaluated after an accelerated ageing protocol (120 degrees C for 36h). Ion implantation increased the surface hardness, as well as friction coefficients, and decreased the wear factors especially at the highest doses. Also, even though all artificially aged materials showed a worse wear behaviour, polyethylenes implanted with either N+ or He+ at the highest doses maintained a relatively good wear factor in comparison with the aged non-implanted material. The origins of these modifications are discussed according to the effects of ion implantation on the microstructure of the polymer.

Item Type:Article
Uncontrolled Keywords:ultra-high-molecular-weight polyethylene; highly cross-linked polyethylenes; ion implantation; wear resistance; ageing
Subjects:Material Science > Functional and hybrid materials
Engineering > Nanotechnology applications in mechanical engineering
ID Code:614
Deposited By:M T V
Deposited On:04 Dec 2008 14:20
Last Modified:04 Dec 2008 14:20

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