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Fretting of CoCrMo and Ti6Al4V alloys in modular prostheses
Institute of Functional Surfaces (iFS), School of Mechanical Engineering, University of Leeds, Leeds, UK.
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Public Health and Caring Sciences, Caring Sciences. Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Public Health and Caring Sciences, Centre for Research Ethics and Bioethics.
Institute of Functional Surfaces (iFS), School of Mechanical Engineering, University of Leeds, Leeds, UK.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences. (Materials in Medicine)ORCID iD: 0000-0001-9529-650X
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2015 (English)In: Tribology - Materials, Surfaces & Interfaces, ISSN 1751-5831, E-ISSN 1751-584X, Vol. 9, no 4, p. 165-173Article in journal (Refereed) Published
Abstract [en]

Implantation of a total hip replacements (THR) is an effective intervention in the management of arthritis. Modularity at the taper junction of THR was introduced in order to improve the ease with which the surgeon could modify the length of the taper section and the overall length of the replacement. Cobalt chromium (Co–28Cr–6Mo) and titanium (Ti–6Al–4V) alloys are the most commonly used materials for the device. This study investigates the fretting behaviour of both CoCr–CoCr and CoCr–Ti couplings and analyses their damage mechanisms. A reciprocating tribometer ball on plate fretting contact was instrumented with in situelectrochemistry to characterise the damage inflicted by tribocorrosion on the two couplings. Fretting displacements amplitudes of 10, 25 and 50 μm at an initial contact pressure of 1 GPa were assessed. The results reveal larger metallic volume loss from the CoCr–CoCr alloy compared to the CoCr–Ti alloy, and the open circuit potential indicates a depassivation of the protective oxide layer at displacement amplitudes >25 μm. In conclusion, the damage mechanisms of CoCr–CoCr and CoCr–Ti fretting contacts were identified to be wear and fatigue dominated mechanisms respectively.

Place, publisher, year, edition, pages
Taylor & Francis Group, 2015. Vol. 9, no 4, p. 165-173
Keywords [en]
Fretting, Corrosion, Orthopaedics, CoCr, Ti6Al4V, Taper junction, Modularity
National Category
Medical Materials Biomaterials Science
Research subject
Engineering Science with specialization in Materials Science
Identifiers
URN: urn:nbn:se:uu:diva-335558DOI: 10.1179/1751584X15Y.0000000014OAI: oai:DiVA.org:uu-335558DiVA, id: diva2:1163352
Funder
EU, FP7, Seventh Framework Programme, NMP-310477Available from: 2017-12-06 Created: 2017-12-06 Last updated: 2018-02-08

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