Properties & application possibilities:

  • Smooth surface
  • High mechanical hardness
  • Chemical resistance
  • Low coefficient of friction between a tool and a workpiece
  • Non-reflective surface
  • Suitability for biocompatible products

Categories of
DLC coatings:

  • a-C = hydrogen-free amorphous carbon
  • ta-C = tetrahedrally bound 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 bound amorphous carbon with hydrogen
  • a-C:H:X = non-metal-doped 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 most important properties of DLC coatings

  • DLC1 (CBC)

    DLC2

    DLC3

  • Composition

    a-C:H:Me

    a-C:H:Si

    ta-C + a-C (up to 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]

    x < 1

    x < 4

    x < 1.5

  • Young’s modulus [GPa]

    200

    250

    500

  • Hardness [GPa]

    < 20

    < 25

    30 - 40

  • Roughness

    Ra ~ 0.1 µm -
    Rz ~ coating thickness

    Ra ~ 0.03 µm -
    Rz ~ coating thickness

    Ra ~ 0.02 µm -
    Rz ~ coating thickness

  • Coefficient of friction to steel

    µ ~ 0.15

    µ ~ 0.1

    µ ~ 0.1

  • Temperature resistance [°C]

    < 400

    < 450

    < 450

  • Coating temperature [°C]

    < 400

    < 180

    < 180

  • Example coating

    cVIc

    CROMVIc2

    CROMVIc3

  • Main application

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

    Friction reduction for machine components, molds & dies

    Cutting of light metals, composites & graphite

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