Micro-abrasion mechanisms of cast CoCrMo in simulated body fluids
Micro-abrasion mechanisms of cast CoCrMo in simulated body fluids
The abrasion seen on some of the retrieved CoCrMo hip joints has been reported to be caused by entrained hard particles in vivo. However, little work has been reported on the abrasion mechanisms of CoCrMo alloy in simulated body environments. Therefore, this study covers the mapping of micro-abrasion wear mechanisms of cast CoCrMo induced by third body hard particles under a wide range of abrasive test conditions. This study has a specific focus on covering the possible in vivo wear modes seen on metal-on-metal (MoM) surfaces. Nano-indentation and nano-scratch tests were also employed to further investigate the secondary wear mechanisms—nano-scale material deformation that involved in micro-abrasion processes. This work addresses the potential detrimental effects of third body hard particles in vivo such as increased wear rates (debris generation) and corrosion (metal-ion release). The abrasive wear mechanisms of cast CoCrMo have been investigated under various wear-corrosion conditions employing two abrasives, SiC (4 ?m) and Al2O3 (1 ?m), in two test solutions, 0.9% NaCl and 25% bovine serum. The specific wear rates, wear mechanisms and transitions between mechanisms are discussed in terms of the abrasive size, volume fraction and the test solutions deployed. The work shows that at high abrasive volume fractions, the presence of protein enhanced the wear loss due to the enhanced particle entrainment, whereas at much lower abrasive volume fractions, protein reduced the wear loss by acting as a boundary lubricant or rolling elements which reduced the abrasivity (load per particle) of the abrasive particles. The abrasive wear rate and wear mechanisms of the CoCrMo are dependent on the nature of the third body abrasives, their entrainment into the contact and the presence of the proteins.
micro-abrasion, mechanisms, cast, CoCrMo, simulated body fluids, Cast CoCrMo, Micro-abrasion, Wear mechanism, Nano-scratch, Nano-indentation
Sun, D.
ccee3ca1-d1bb-46a7-b0a9-438700125b89
Wharton, J.A.
965a38fd-d2bc-4a19-a08c-2d4e036aa96b
Wood, R.J.K.
d9523d31-41a8-459a-8831-70e29ffe8a73
Sun, D.
ccee3ca1-d1bb-46a7-b0a9-438700125b89
Wharton, J.A.
965a38fd-d2bc-4a19-a08c-2d4e036aa96b
Wood, R.J.K.
d9523d31-41a8-459a-8831-70e29ffe8a73
Sun, D., Wharton, J.A. and Wood, R.J.K.
(2008)
Micro-abrasion mechanisms of cast CoCrMo in simulated body fluids.
Wear.
(doi:10.1016/j.wear.2009.03.005).
(Submitted)
Abstract
The abrasion seen on some of the retrieved CoCrMo hip joints has been reported to be caused by entrained hard particles in vivo. However, little work has been reported on the abrasion mechanisms of CoCrMo alloy in simulated body environments. Therefore, this study covers the mapping of micro-abrasion wear mechanisms of cast CoCrMo induced by third body hard particles under a wide range of abrasive test conditions. This study has a specific focus on covering the possible in vivo wear modes seen on metal-on-metal (MoM) surfaces. Nano-indentation and nano-scratch tests were also employed to further investigate the secondary wear mechanisms—nano-scale material deformation that involved in micro-abrasion processes. This work addresses the potential detrimental effects of third body hard particles in vivo such as increased wear rates (debris generation) and corrosion (metal-ion release). The abrasive wear mechanisms of cast CoCrMo have been investigated under various wear-corrosion conditions employing two abrasives, SiC (4 ?m) and Al2O3 (1 ?m), in two test solutions, 0.9% NaCl and 25% bovine serum. The specific wear rates, wear mechanisms and transitions between mechanisms are discussed in terms of the abrasive size, volume fraction and the test solutions deployed. The work shows that at high abrasive volume fractions, the presence of protein enhanced the wear loss due to the enhanced particle entrainment, whereas at much lower abrasive volume fractions, protein reduced the wear loss by acting as a boundary lubricant or rolling elements which reduced the abrasivity (load per particle) of the abrasive particles. The abrasive wear rate and wear mechanisms of the CoCrMo are dependent on the nature of the third body abrasives, their entrainment into the contact and the presence of the proteins.
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Submitted date: 2008
Additional Information:
The National Centre for Advanced Tribology at Southampton (nCATS), School of Engineering Sciences, University of Southampton, Highfield, Southampton SO17 1BJ, UK; Presented at the 1st International Conference on Abrasive Processes, September 2008, Cambridge
Keywords:
micro-abrasion, mechanisms, cast, CoCrMo, simulated body fluids, Cast CoCrMo, Micro-abrasion, Wear mechanism, Nano-scratch, Nano-indentation
Identifiers
Local EPrints ID: 64908
URI: http://eprints.soton.ac.uk/id/eprint/64908
ISSN: 0043-1648
PURE UUID: 0b0da4b1-6d73-4178-b6ba-61e6fbe638b5
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Date deposited: 27 Jan 2009
Last modified: 16 Mar 2024 02:59
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Author:
D. Sun
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