Titanium Nitriding

Composition and characteristics

  • Nitriding is a thermos-chemical heat treatment process introducing nitrogen into the outermost surface of parts and components.
  • Typical Titanium nitride layer thickness is in the range of 1 – 3 μm
  • Typical layer thickness of diffusion zone is 20 – 40 μm
  • High surface hardness (900-1100 HV0,05)
  • Improved Wear Resistance
  • Improved Adhesive Wear

Fields of Application

  • Aerospace.
  • Motorsport.
  • Medical

Example;

A formula one steering rack was PVD coated (TiN). The TiN layer only lasted one race. By changing to pulse plasma nitriding the lifetime was increased to 8-10 races, indeed the life was not limited because of wear but because the design fatigue life had been reached. Pulse plasma nitriding is also considered state of the art for the treatment of titanium valves.
To achieve a glossy appearance after nitriding (like after PVD coating) then polishing is required, but there is no danger of the layer spalling on the nitrided surface as you would expect with PVD coating.

Titanium Nitriding