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Mechanics

PVD technologies allow to realise hard and wear resistant coatings that increase lifetime and performances of drilling, forming, punching, mould-making, cutting tools and mechanical parts.

All metals can be coated, including stainless steel, non-ferrous alloys, Al, Ti, Cu and their respective alloys, Zn-Al, and temperature sensitive steels like 100Cr6. The criteria for the choice of materials for hard coatings depend on the properties exhibited by the film at the surface, its inside ("bulk") and to the interface between film-substrate. The interaction of the surface with the atmosphere and the working material must be as low as possible, the film must be hard but very important is also the toughness to eventual fracture and a very good adhesion. It is well known that materials with metallic bonds (e.g. TiN, TiC) have medium hardness and low embrittlement with regard to covalent materials (e.g. AlN) or ionic ones (Al2O3). In the case of interstitial compounds (nitrides, carbides, borides) of transition metals, all of them having metallic bonds, nitrides have the smallest tendency to react with the atmosphere, but also the smallest adhesion.

Our most popular PVD coatings for mechanical applications are TiN, CrN, TiCN, AlTiN and ZrN. They can also be provided in multilayer configurations. For instance Cr/CrN/Cr/CrN/…coatings have excellent toughness and oxidation resistance, compared to other coatings, and can be deposited to higher thicknesses (3 to 8 micron). They are well suited to prevent cold-welding and sticking to metal and plastic counterparts during operation.
AlTiN coatings have excellent behaviour in dry machining, but also added top-coats containing nanophases of low friction materials, like nanographites or MoS2-type materials, can be employed.

Thin amorphous carbon films, free of hydrogen, as deposited by magnetron sputtering from a few nm to some tens of nm thick, if deposited with a negative bias, are atomically smooth independently of the thickness, and are rich in sp3 bonding.
Other coatings based on the incorporation of ultra-hard phases of WC-type in an amorphous DLC matrix have excellent wear resistance and extremely low friction; thus they are suitable for high tribo-stress components like gears.

 

Kenosistec provides customers with a complete line of cathodic arc systems and can supply “key in hands” production facilities including ultrasonic cleaning lines, quality control instruments and integrated process and production know how.

To deposit coatings in the whole range of thicknesses, from a few nanometers to several micrometers, Kenosistec can deliver hybrid units combining cathodic arc and magnetron sputtering. Adhesion-promoting very fine layers (e.g. Ti) as well as top layers (e.g. TCO transparent conductive layers or glass-like layers) can easily be incorporated in the coating architecture.

 

See KSA Series - industrial equipment.

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