Comparison of arc evaporated Mo-based coatings versus Cr1N1 and ta–C coatings by reciprocating wear test

Cathodic arc evaporation was utilized to synthesize Cr–N, ta–C, Al–Mo–N, Mo–N, Mo–O–N and Mo–Cu–N coatings. The coatings were characterized with respect to their stoichiometry, morphology and mechanical properties. A reciprocating wear test was used to compare the wear behavior for the unpolished coatings under dry conditions and polished coatings under lubricated (Mo-DTC) conditions. The test allows a classification of the coatings with respect to material transfer similar to scuffing or fretting and with respect to wear of the counter-part and may be utilized for a pre-selection of coatings for engine tests.