Selflubricating hard coatings: at low temperature a layer of an amorphous diamant carbon is applied on finished parts.
Features: in order to obtain the best compromise between wear resistance (which is related to high hardness) and selflubricating properties the parts are put in a PACVD (plasma assistant chemical vapor deposition) vacuum furnace. On top of the low friction in the boundary lubrication regime this low friction coefficient is available in contact with a wide variety of materials. Even those which tend to galling and seizing, for instance aluminium, titanium, stainless steel, etc.
Applications:
high precision friction parts
parts subject to high pressure, for instance bearings and gears
dry lubrication or in hydrodynamic lubrication regimes in contact with lubricants with low lubrication properties
sliding and friction in abrasive conditions
friction applications in vacuum
forming and cutting tools for light metals
1500 to 3500 HV depending from composition and applications
1 to 5 µm application dependent
perfect and constant film thickness
up to 250° C
respect of tolerances and surface roughness
perfect chemical inertness, solvant and acid resistant
temperature range up to 300°C-350°C
colour: black
higher wear resistance in abrasive and adhesive wear conditions
lower coefficient of friction up to 0,01 in vacuum
better performance against galling and seizing: no adhesion, no pickup
better wear resistance even in closed tolerances, no other lubrication required
metals, light metals, steel, aluminium, hardmetals
the surface roughness should be as low as possible
example of the results contact steel to aluminium
the pin disc test – dry friction
P.V.: 1 MPa.m.s.ˉ¹