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Lubricants 2016, 4(2), 21;

On the Growth Rate of Tribomaterial in Bovine Serum Lubricated Sliding Contacts

Materials Science and Engineering, University of Duisburg-Essen, 47057 Duisburg, Germany
Surface Technology and Tribology, University of Twente, 7500 AE Enschede, The Netherlands
Department of Orthopedics, Rush University Medical Center, Chicago, IL 60612, USA
Author to whom correspondence should be addressed.
Academic Editors: Werner Oesterle and Ga Zhang
Received: 16 February 2016 / Revised: 8 April 2016 / Accepted: 5 May 2016 / Published: 21 June 2016
(This article belongs to the Special Issue Tribofilms and Solid Lubrication)
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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. View Full-Text
Keywords: tribomaterial; bovine serum; sliding wear; metal-on-metal tribomaterial; bovine serum; sliding wear; metal-on-metal

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Fischer, A.; Stickel, D.; Schoss, C.; Bosman, R.; Wimmer, M.A. On the Growth Rate of Tribomaterial in Bovine Serum Lubricated Sliding Contacts. Lubricants 2016, 4, 21.

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