ZrN-coated knee component made by DOT GmbH

Titanium Aluminum Nitride Coatings (TiAlN)


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

TiAlN coatings only modify the surface properties. The material properties and biomechanical functionality is not altered by the coating.
  • Color: dark violett to glossy black-anthracite
  • Coating thickness: 0.5-6 µm
  • Roughness: Ra ≤ 0.05 µm
  • Adhesion strength: at least HF 1 (DIN EN ISO 26443)
  • No influence of the coating on fatigue strength
  • Coating hardness: ~2,700 HV
  • Wear resistance: very high wear resistance towards bone cement
  • Liquid contact angle: reduction of the liquid contact angle results in improved surface wettability

Range of Application

  • Orthopedic implant components
  • Surgical instruments
  • Rotating instruments
Advantages of the Procedure
  • Higher wettability with synovial fluid
  • Low friction articulation
  • Long-term chemical stability
  • Outstanding coating adhesion

DOT offers further variations of ceramic hard coatings:

Charles-Darwin-Ring 1a
18059 Rostock l Germany

Phone: +49 381- 4 03 35-0


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