Abstract
Abstract This contribution reports research concerning the wear behaviour of two thin hard coatings, diamond-like carbon (DLC) and chromium-nitride (CrN), deposited on substrate of different level of hardness. Prior to wear testing, all coatings were characterised with respect to their thickness, Young's modulus, hardness, and cohesion/adhesion. Afterwards, all samples were tested on particle erosion and abrasion. The particle erosion test shows a very low resistance of DLC coatings on that type of wear for all substrate hardnesses. CrN coating shows significantly better particle erosive wear resistence for very hard substrate than for soft. Abrasion tests have been performed by the use of two different methods: microscale abrasion, and dry sand/rubber wheel test under various normal loads. It was found that for the normal loads in range 0,1 N—1 N substrate hardness has no influence on the CrN lifetime, but for the higher normal loads 5 N—45 N hardness of the substrate strongly affects the CrN wear lifetime. DLC coating shows significant dependence on substrate hardness for all applied loads.
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