Vacuum deposition technologies, which respect the environment, are commonly used in many areas (electronics, automotive, aeronautics, health, etc.) because of the high purity of the layers and high density of coatings that can be obtained. These thin layers (from 0.1 microns to a few tens of micrometers), have very advanced functional properties.

Principle of PVD deposits

CITRA has in its premises a vacuum deposition machine of PVD / PECVD type whose general operating principle is:

  • In a chamber under high vacuum, a plasma gas (typically argon) is introduced.
  • A plasma discharge is then created by negative polarization of a target made of the material to be deposited (cathode).
  • The atoms of the gas thus ionized will bombard the target and spray it so that the atoms then torn off are deposited on the substrate.

 

Ceramic coatings

To obtain a controlled stoichiometry ceramic, it is possible to introduce reactive gases into the chamber.

 

Range of coatings offered

CITRA offers a large range of different coatings:

  • Pure metals
  • Metallic alloys
  • Multilayer
  • Nitrides and carbides
  • Ceramics, DLC, etc.

The PVD / PECVD process therefore makes it possible to respond to many applications by improving:

  • Electrical properties to obtain a conductive coating (copper, aluminum, silver)
  • Resistance to wear and corrosion (chromium, nickel and alloys), due to the extremely high density of the deposits made;
  • The very bright appearance of the coating, virgin of any pollution thanks to the vacuum.

 

Realizable coatings directly

Coating Properties Applications
TiN Abrasion resistance, low coefficient of friction Cutting and forming tools, molds, matrices, decoration.
CrN Hardness, oxidation resistance, low coefficient of friction Hard chrome substitution, copper machining tools, metallurgy, plastics molds.
Amorphous carbone (DLC) Low coefficient of friction, wear resistance, decoration Valves, pistons, various axles, prostheses, jewelery
Metals (Ti, Cr, Cu, Ag, Al) Conductivity, undercoat Electrical Properties, Decoration

Coatings requiring specific placement

Coating Properties Applications
AlN Piezoelectricity Electronic
Ti(X,Y)N, Ti(X)CN Resistance to heat (800 ° C) and oxidation Machining tools (titanium, aluminum, nickel, steels), protection of molds.