Mapping the micro-abrasion mechanisms of CoCrMo: some thoughts on varying ceramic counterface diameter on transition boundaries invitro

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Abstract

The micro-abrasion wear mechanisms for CoCrMo against variable size alumina balls, representing typical artificial femoral head sizes, were investigated over a range of applied loads in foetal calf serum solution. SEM analysis of resulting wear scars displayed two-body and mixed-mode abrasion modes of wear. The wear factor, κ was found to range between 0.86 and 22.87 (10-6 mm3/ Nm). Micro-abrasion mechanism and wastage maps were constructed for parameter range tested. A dominant 3-2 body abrasion regime was observed with increasing load and ball diameter. A 28 mm ball diameter displayed the lowest wastage with increasing load. Proteins may act to reduce the severity of contact between abrasive particles and bearing surfaces. Wear volumes did not necessarily increase linearly with applied load and ball diameter, therefore, there is a need to develop further accurate models for wear prediction during micro-abrasion conditions. Wear mapping for hip replacement could provide a useful aid in pre-clinical hip wear evaluations and long-term performance.
Original languageEnglish
Article number71
Number of pages20
JournalLubricants
Volume8
Issue number7
DOIs
Publication statusPublished - 1 Jul 2020

Keywords

  • micro abraison
  • ceramic on metal
  • artificial hip
  • CoCrMo
  • wear maps

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