Coating, general requirements

- Metal surfaces must be bright and free from burrs, oxide or non-metallic impurities.
- Ground surface must be free from grind burns and micro-cracks.
- Components produced by EDM methods should be blasted (Not Glass bead) to remove oxide before
final finishing.
- DLC surface should ideally polished to 0.10 Ra or better.
- Polished or lapped surfaces must be free of compound residues.
- Components should be de-magnetised.
- Components should not be bolted or glued assemblies.
- Components should not contain enclosed spaces, inserts, O-rings, waterway plugs or water baffles.
- Braze, including use in carbide tipped tools, must have a re-melting temperature > 550°C.
NOTE: Braze alloy with main elements of Cadmium and Zinc, must be avoided and notified.
- Should be marked clearly on a drawing or picture.
- Components need to be jigged in the chamber, thus a suitable method of jigging must be available.
- This requires a hole, which may be threaded (metric), or an area where a wire may be attached.
- If areas must remain uncoated they must be suitable for mechanical masking.
- If special purpose jigging is necessary it may require part or total funding.
- Components shall be packed in such a way as to avoid damage by impact.
- Oils or preservatives that contain Silicon will create additional work and must be notified to us.
- Any corrosion inhibiting agent used must be easily removable by aqueous alkaline cleaning.
- Coating thickness is geometry dependent.
- Coating inside holes or tubes may be limited (please consult Tecvac for advice).
- Coatings are carried out in a vacuum processes (assemblies and inserts are best dismantled).
- TiN, CrN, NitronCA and NitronO thickness is typically 1-4 microns.
- NitronMC and DLC thickness is typically 2-3 microns.
- TiN, CrN, TiAlN, NitronMC, NitronCA and DLC coatings reduce the coefficient of friction.
- TiN, CrN and NitronCA coatings are carried out at a maximum temperature of 500ºC.
- DLC typical temperature is 300°C (consult Tecvac for lower temperatures).
- WS2 applied at room temperature.
- NitronO and Nitron100 are carried out at a temperature of 700°C.
- Chemical, vapour and grit blast cleaning is available.
- Items will require an order number, coating required, material type, material heat treatment condition,
quantity, area of importance, contact name and quotation number if applicable.
- Please DO NOT identify parts to be coated with a magic marker/felt tip pen etc (a simple sketch or
drawing is preferred).
For further technical advice please contact our Sales Team at Tecvac