On the growth rate of tribomaterial in bovine serum lubricated sliding contacts

Alfons Fischer*, Daniel Stickel, Christian Schoss, Rob Bosman, Markus A. Wimmer

*Corresponding author for this work

    Research output: Contribution to journalArticleAcademicpeer-review

    2 Citations (Scopus)
    17 Downloads (Pure)

    Abstract

    Considering total hip arthroplasty, so-called tribolayers (aka tribomaterial), consist of carbonaceous material from the periprosthetic joint fluid or bovine serum mixed with nanometer size metal and oxide wear particles. Currently, its growth sequence and rate are unknown. Thus, smooth surfaces of low-Carbon (LC-) vs. high-Carbon (HC-)CoCrMo (Cobalt-Chromium-Molybdenum) alloys have been worn in a conforming contact under bovine serum lubrication by means of a pin-on-ball wear tester. These tests were interrupted at certain numbers of cycles in order to weigh the specimens, characterize the topography, and investigate the wear appearances. In addition, after cleaning in ethanol and anionic detergent, before-and-after comparison rendered the weight of the tribomaterial. This revealed that, during run-in, the specimens gained weight by generating tribomaterial. Afterwards the loss of material surpassed the generation of new tribomaterial and a steady weight-loss was measured. Topography measurements were used as input data for contact mechanics calculations. Apparently the incipient, locally high contact stresses accelerated tribochemical reactions. After run-in, the contact situation changes and leads to a much smaller generation rate. This paper provides information about the growth sequence and rate of such tribomaterial formation. It further highlights the significance of highly localized contact stress as an important factor for tribomaterial generation.

    Original languageEnglish
    Article number21
    JournalLubricants
    Volume4
    Issue number2
    DOIs
    Publication statusE-pub ahead of print/First online - 21 Jun 2016

    Keywords

    • Bovine serum
    • Metal-on-metal
    • Sliding wear
    • Tribomaterial

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  • Cite this

    Fischer, A., Stickel, D., Schoss, C., Bosman, R., & Wimmer, M. A. (2016). On the growth rate of tribomaterial in bovine serum lubricated sliding contacts. Lubricants, 4(2), [21]. https://doi.org/10.3390/lubricants4020021