Specialized  PVD  Coatings  

Physical vapor deposition (PVD) describes a variety of vacuum deposition methods that can be used to produce thin coatings.  PVD is typically used to coat components at relatively low coating temperatures of 200-500 °C.  These temperatures are ideal because they are below the tempering temperature of steels to avoid altering the fundamental material properties.
Fortunately there are several carbon-based coatings available that provide a unique combination of extreme surface hardness, low friction coefficient and anti-corrosion properties. WC/C ductile carbide carbon coating that is highly resistant to adhesive wear (scuffing) in particular. It has a high load-bearing capacity even under conditions of deficient lubrication or dry contact. Due to its low friction coefficient, it acts to reduce pitting and fretting corrosion

DLC coatings

DLC coating, a metal-free, carbon based coating that is even more durable than most PVD.  PVD is Applied through Plasma-Assisted Chemical Vapor Deposition (PACVD), this coating is designed for more severe wear conditions and high relative sliding speeds to protect against abrasion, scuffing and cold welding , case-hardened or tempered steels, authenticate stainless steel as well as nickel, titanium, copper, magnesium and aluminum alloys.
These materials provide an excellent combination of low coefficient of friction like PTFE, but with the hardness of a ceramic. These coatings also have the advantage of being thin, typically 0.2-6μm. This feature, in conjunction with close tolerance, means that the component retains its form, fit and dimensions after coating without the need for re-machining.