Tribo-active HPPMS-PVD (Cr,Al)N coatings

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The primary objective of this research project is to gain fundamental knowledge of the interactions between lubricants and (Cr,Al)N coatings in mixed friction area. Specific emphasis is given to the use of tribo-active elements X (W, Ta, Mo, Cu) in the coatings and the innovative HPPMS (High Power Pulse Magnetron Sputtering)-PVD (Physical Vapour Deposition)-technology. Alternatively to DLC (Diamond Like Carbon) coatings a much more thermally stable class of friction-reducing and wear-resistant coatings for the application on lubricated machine elements at elevated temperatures is to be developed. In most cases lubricants contain many different additives which are optimised for the application on metallic surfaces. As a result of this, it has to be analysed whether the synergistic effects between the additive containing lubricants and the tribo-active elements of the metallic surface of the component can be transferred to the (Cr,Al)N-HPPMS-PVD-coatings, which are doped with tribo-active elements. The influence of the tribo-active elements as well as the coating parameters on the coating and compound properties are examined. The impact on the system properties friction and wear are analyzed in tribological investigations. In this way especially by using micro raman spectroscopy fundamental insights concerning the formation and composition of tribo-chemical reaction layers are to be achieved as well as an understanding of the interactions between the tribo-active elements of the (Cr,Al)N-HPPMS-coatings and the additives of lubricants is to be obtained.