The higher proportion of sp3 bonds results in:

  • higher density,
  • higher hardness (at room temperature and elevated temperature),
  • thermal stability,
  • oxidation resistance,
  • higher residual stress and
  • higher thermal conductivity.

This characteristic leads to special properties and application possibilities:

  • Smooth surface
  • High mechanical hardness
  • Chemical resistance
  • Low coefficient of friction between tool and workpiece
  • Good corrosion resistance
  • Non-reflective surface
  • Suitability for biocompatible products
Diamond Like Carbon Graph2

Categories of DLC coatings

  • a-C = Hydrogen-free amorphous carbon
  • ta-C = Tetrahedrally-bonded hydrogen-free amorphous carbon
  • a-C:Me = Metal-doped hydrogen-free amorphous carbon
    (Me = Ti)
  • a-C:H = Amorphous carbon with hydrogen
  • ta-C:H = Tetrahedrally-bonded amorphous carbon with hydrogen
  • a-C:H:Si = Si-doped amorphous carbon with hydrogen
  • a-C:H:Me = Metal-doped amorphous carbon with hydrogen
    (Me = W, Ti)

Comparison of the main properties of PLATIT DLC coatings

  • DLC1

    DLC2

    DLC3

  • PLATIT coating unit

    Pi111,
    Pi411,
    PL1011

    Pi411,
    PL711,
    PL1011

    Pi411

  • Composition

    a-C:H:Me

    a-C:H:Si

    ta-C + a-C
    (over 50% ta-C)

  • Process

    Arc in C2H2 atmosphere

    PECVD

    Sputtering

  • Coating architecture

    As top layer

    As stand-alone or as top layer

    As stand-alone

  • Doping

    Ti or Cr

    Si

    None

  • Coating thickness [µm]

    < 1

    < 3

    0.3 - 1

  • Young’s modulus [GPa]

    200

    250

    350 - 450

  • Nano-hardness [GPa]

    < 20

    > 25

    35 - 55

  • Roughness

    Ra ~ 0.1 µm
    Rz ~ coating thickness

    Ra ~ 0.03 µm
    Rz ~ coating thickness

    Ra ~ 0.06 µm
    Rz ~ coating thickness

  • Coefficient of friction [μ]
    PoD (at RT, 50 % humidity)

    0.15

    0.1 - 0.2

    0.1

  • Max. service temperature [°C]

    400

    400

    450

  • Coating temperature [°C]

    < 400

    < 220

    < 100

  • Main application

    Improvement of the run-in process of a tool, lubrication by formation of transfer films

    Components, punches and dies

    Tools

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