Abstract
Using hard triboactive (Cr,Al,X)N coatings (X = Mo, Cu) on chain pins is promising to increase the energy efficiency and sustainability of chain drives. (Cr,Al,X)N coatings, when interacting with lubricants, can build a tribofilm in the contact zone which has wear- and friction-reducing properties. These tribofilms can also be transferred to the surface of the chain bush, protecting it from wear. In this study, these coatings were tribologically investigated via pin-on-disc tribometer and a chain-joint tribometer under grease lubrication. The results showed that the (Cr,Al,Mo)N coating achieved the lowest total wear volume and lowest friction coefficient. The tribofilms showed a comparable composition on chain pins and bushes after the tests indicating a transfer of the tribofilm.
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