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Corrosion fatigue in DLC-coated articulating implants: an accelerated methodology to predict realistic interface lifetime.

  • Pardo A Laboratory for Joining Technologies and Corrosion, Empa, Swiss Federal Laboratories for Materials Science and Technology, CH-Dübendorf, Switzerland.
  • Ilic E Laboratory for Joining Technologies and Corrosion, Empa, Swiss Federal Laboratories for Materials Science and Technology, CH-Dübendorf, Switzerland.
  • Thorwarth K Laboratory for Nanoscaled Materials Science, Empa, Swiss Federal Laboratories for Materials Science and Technology, CH-Dübendorf, Switzerland.
  • Stiefel M Laboratory for Transport at Nanoscale Interfaces, Empa, Swiss Federal Laboratories for Materials Science and Technology, CH-Dübendorf, Switzerland.
  • Hauert R Laboratory for Joining Technologies and Corrosion, Empa, Swiss Federal Laboratories for Materials Science and Technology, CH-Dübendorf, Switzerland.
  • 2019-03-21
Published in:
  • Science and technology of advanced materials. - 2019
104 Carbon and related materials
212 Surface and interfaces
30 Bio-inspired and biomedical materials
306 Thin film / Coatings
503 TEM, STEM, SEM
600 Corrosion Fatigue
DLC coating
Interface
corrosion fatigue
implant lifetime
English We present a methodology to accelerate and estimate the lifetime of an interlayer under dynamic loading in body-like media. It is based on accelerating corrosion fatigue processes taking place at the buried interface of a Si-based adhesion-promoting interlayer in articulating implants on a CoCrMo biomedical alloy; the implants are coated with diamond-like carbon (DLC). The number of interface loading cycles to delamination is determined by reciprocal loading in corrosive fluid. Its dependence on the load is summarized in a Wöhler-like curve of a DLC/DLC-Si/CoCrMo system in body working conditions: cyclic stresses at 37 °C in phosphate buffered saline (PBS). The presence of oxygen as a contaminant strongly affects the lifetime of the interface under corrosion fatigue. The main parameters acting on the prediction, with a special emphasis on simulated in vivo conditions, are analyzed and discussed: the media (PBS, Milli-Q water, NaCl, Ringers' solution and bovine calf serum), the load, the frequency and the composition of the interface determined by X-ray photoelectron spectroscopy.
Language
  • English
Open access status
gold
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Persistent URL
https://sonar.ch/global/documents/92974
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