Processes for surface treatment Processes for the surface treatment of tools and precision components

Electro- or chemical plating (hard chromium, chemical nickel)

Advantages:

  • Good corrosion resistance
  • Low processing temperature
  • Deposition also in bore holes, slots etc.

Disadvantages:

  • Limited selection of coating materials
  • Relatively soft coatings
  • Ecologically problematic treatment baths (include cyanide, heavy metals, fluorides, oils and greases)
  • Limited accuracy of surface replication
Diffusion processes (Nitriding, nitrocarburisation, boronizing, phosphating, etc.)

Advantages:

  • Good corrosion resistance
  • Good reproducibility

Disadvantages:

  • Relatively soft coatings
  • Limited selection of base material (must be suitable for nitriding)
  • Long processing times
  • Substances from processing are damaging to the environment and to health
  • Post-treatment required
CVD (Chemical Vapour Deposition)

Advantages:

  • High wear resistance
  • Economic production of thicker coatings
  • Also suitable for bore holes, slots etc.

Disadvantages:

  • High processing temperatures
  • Coatings with several metals (e.g. TiAlN) are not possible
  • Edges become rounded (coating thickness)
  • Uses ecologically problematic, toxic metal chlorides
PACVD (Plasma-Assisted Chemical Vapour Deposition)

Advantages:

  • Significantly lower process temperatures are possible than for CVD
  • Precise coatings
  • Low temperatures

Disadvantages:

  • Only limited suitability for bore holes, slots etc.
PVD (Physical Vapour Deposition)

Advantages:

  • No environmentally damaging materials and emissions, no toxic reaction products
  • Great variety of coatings can be produced
  • Coating temperature below the fineal heat treatment temperature of most steels
  • Small, precisely reproducible coating thickness (accurate surface replication, true to size,
  • High wear resistance
  • Low frictional coefficient

Disadvantages:

  • Bore holes, slots etc. can only be coated down to a depth equal to the diameter or width of the opening
  • Corrosion resistant only under certain conditions
  • In order to achieve a uniform coating thickness, the parts to be coated must be rotated during processing
P3eTM (pulse Enhanced Electron Emission)

Advantages:

  • All advantages of PVD technology
  • Great variety of oxide based coatings possible
  • First alpha-aluminium oxide based coating by a PVD process
  • Low deposition temperature (600°C) compared to CVD (1'000°C) for deposition of alpha-aluminium oxide

Disadvantages:

  • Same as for PVD technology
Contacts
Marc Desrayaud
Coating for Tools
Sales
P: +423 388 7500
F: +423 388 5419
Contact Us
Oerlikon Balzers Coating AG
Iramali 18
9496 Balzers
Liechtenstein
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