What is a coating

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

IN TERMS OF:

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

Coating process

1

Loading

The coating chamber is loaded

2

Evacuating

A high vacuum is required when depositing PVD coatings.

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

  • Rotary vane pump generates an inlet pressure in the chamber (from 100 to 10 -2 mbar)
  • Turbomolecular pump generates a high vacuum of approximately 1 x 10 -5 mbar

3

Heating

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

4

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)

5

Coating deposition

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

6

Cooling

Cooling of the coating chamber

7

Unloading

The coating chamber is unloaded

LGD® etching

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

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

Shuttering:

  • 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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