Towards near-permanent CoCrMo prosthesis surface by combining micro-texturing and low temperature plasma carburising

Research output: Contribution to journalArticlepeer-review

Authors

  • Petr Svoboda
  • Martin Vrbka
  • David Kostal
  • Filip Urban
  • Jan Cizek
  • Pavla Roupcova
  • Ivan Krupka
  • Martin Hartl

Colleges, School and Institutes

Abstract

An advanced surface engineering process combining micro-texture with a plasma carburising process was produced on CoCrMo femoral head, and their tribological properties were evaluated by the cutting-edge pendulum hip joint simulator coupled with thin film colorimetric interferometry. FESEM and GDOES showed that precipitation-free C S-phase with a uniform case depth of 10 μm was formed across the micro-textures after duplex treatment. Hip simulator tests showed that the friction coefficient was reduced by 20% for micro-metre sized texture, and the long-term tribological property of microtexture was enhanced by the C-supersaturated crystalline microstructure formed on the surface of duplex treated CoCrMo, thereby enhancing biotribological durability significantly. In-situ colorimetric interferometry confirmed that the maximum film thickness around texture area was 530 nm, indicating that the additional lubricant during sliding motion might provide exceptional bearing life.

Details

Original languageEnglish
Pages (from-to)215-227
JournalJournal of the Mechanical Behavior of Biomedical Materials
Volume55
Early online date1 Nov 2015
Publication statusPublished - 1 Mar 2016

Keywords

  • Plasma carburising , Surface texturing , Wear , Biotribology , Colorimetric interferometry , Friction