TiN-coated femoral component made by DOT GmbH

Titanium Nitride Coatings (TiN)


An arc with high current density is run over the target material causing it to evaporate and to release titanium atoms, which are ionized and propelled towards the implant.
During the process, nitrogen is introduced into the vacuum chamber. The TiN coating is formed when the titanium ions strike the implant surface and, simultaneously, combine with the nitrogen atoms.

Range of Application

  • Orthopedic implant components
  • Surgical instruments
  • Rotating instruments

DOT video TiN


TiN coatings only modify the surface properties. The material properties and biomechanical functionality is not altered by the coating.
  • Color: golden yellow
  • Coating thickness: 0.5-7 µm
  • Roughness: Ra ≤ 0.05 µm
  • Adhesion strength: at least HF 1 (DIN EN ISO 26443)
  • Coating hardness: ~2,300 HV
  • Wear resistance: extremely high wear resistance towards bone cement
  • Abrasion: low friction coefficient in contact to UHMWPE; significant increase of scratch resistance of the surface
  • Reduction of allergy potential by reduction of ion release to the detection limit
  • Outstanding biocompatibility of TiN (was proven in several publications)
TiN-coated knee implants
Advantages of the Procedure
  • Reduction of ion release
  • 4-times harder than conventional cobalt-chrome alloys
  • Higher wettability with synovial fluid
  • Low friction articulation
  • Long-term chemical stability
  • Extreme adhesive strength

Charles-Darwin-Ring 1a
18059 Rostock l Germany

Phone: +49 381- 4 03 35-0