What is a coating

Comparison human hair and multilayer hard PVD coating

A PVD hard coating is a thin protective film intended to improve the surface properties of a base material,


  • Hardness
  • Oxidation resistance
  • Friction
  • Fracture toughness
  • Chemical stability
Coating hardness comparison
For example, the coating on a cutting tool allows faster cutting speeds, resulting in higher productivity and longer lifespan of the base material.

Coating process



The coating chamber is loaded



A high vacuum is required for depositing PVD coatings.

The evacuation in PLATIT coating units takes place in two steps:

  • The rotary-vane pump generates an inlet pressure in the chamber from 100 to 10 -2 mbar
  • The turbomolecular pump generates a high vacuum of approximately 1 x 10 -5 mbar



The chamber is heated up;
process temperatures are about 150 - 500°C


Plasma etching

PLATIT coating units work with three different etching processes:

  • LGD® (Lateral Glow Discharge)
  • Plasma etching with argon, glow discharge
  • Metal ion etching (Ti, Cr)


Coating deposition

Coating deposition with PVD (ARC, SPUTTER or hybrid LACS® technology) or PECVD processes



Cooling of the coating chamber



The coating chamber is unloaded

LGD® etching

Lateral Glow Discharge is the patented etching process in PLATIT’s coating units

Etching with LGD® can process even complex surfaces and cavities as well as cutting-edges and corners (e.g. of hobs, molds and dies), thanks to plasma with high ion density generated by an electron flow between two cathodes.

Use of shutters:

  • Targets are cleaned by igniting an ARC behind the shutter on the target surface without contaminating the tools
  • The shutter is opened after the cleaning process of the target, which creates ideal conditions for optimal coating adhesion
LGD etching technology

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