Friction of Teflon-S-coated Ti-6Al-4V under conditions of oscillatory relative motion

D.J. Ligterink, G.J. Verkerke, A.W.J. de Gee

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An extendable prosthesis for implantation in a human leg has been developed. The friction forces during extension of the prosthesis must be low, so a coating of Teflon-S was applied to the sliding surfaces. During walking, damage can occur as a result of oscillatory relative motion. Therefore experiments were performed with an apparatus which simulated this type of motion. It was found that the coefficient of friction reached a maximum value within one million movement cycles. This maximum value of the coefficient of friction increased with decreasing coating thickness. Even at an initial coating thickness of less than 1 μm, coating with Teflon-S was found to be very effective in reducing friction.
Original languageEnglish
Pages (from-to)346-350
JournalTribology international
Issue number5
Publication statusPublished - 1990


  • Friction coefficient
  • Extendable prosthesis
  • Teflon-S
  • Oscillatory relative motion


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