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TECHNICAL PAPERS

Effect of Lubricant Protein Concentration on the Wear of Ultra-High Molecular Weight Polyethylene Sliding Against a CoCr Counterface

[+] Author and Article Information
Vesa Saikko

Helsinki University of Technology, Department of Mechanical Engineering, P.O. Box 4300, FIN-02015 HUT, Finland

J. Tribol 125(3), 638-642 (Jun 19, 2003) (5 pages) doi:10.1115/1.1537751 History: Received January 29, 2002; Revised September 19, 2002; Online June 19, 2003
Copyright © 2003 by ASME
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References

Figures

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Variation of polyethylene wear factor with lubricant protein concentration, phase I. Lubricants prepared from serum concentrate.
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Polyethylene wear factor produced in similar test conditions, phase II. Lubricant protein concentration 22.5 mg/ml in all 12 test stations. The order of test stations in Figs. 1 and 3 is the same as here.
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Variation of polyethylene wear factor with lubricant protein concentration, phase III. Lubricants prepared from serum, instead of serum concentrate. Note very high wear factor in station 1 where lubricant was distilled water, indicated by zero concentration.
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Low-magnification optical micrograph from wear face of polyethylene pin after 3 million cycles showing protuberances, which appear dark (phase I, st. 3, c=11.6 mg/ml)
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Optical micrographs from wear face of polyethylene pin after 3 million cycles (phase I, st. 5, protein concentration 23.2 mg/ml). With low magnification (a), criss-cross scratches, and with high magnification (b), ripples and wear debris are seen.
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Scanning electron micrographs from 0.05 μm pore size Nucleopore filters, through which were filtered the digested serum samples from phase I, showing polyethylene wear particles, (a) st. 1, c=2.9 mg/ml, (b) st. 12, c=116 mg/ml.

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