Comparative tribological behaviors of TiN{single bond}, CrN{single bond} and MoN{single bond}Cu nanocomposite coatings

A. Öztürk, K. V. Ezirmik, K. Kazmanli, M. Ürgen*, O. L. Eryilmaz, A. Erdemir

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

156 Citations (Scopus)


The purpose of this study is to investigate comparative tribological behaviors of Cu-doped TiN, CrN, and MoN coatings under a wide range of dry sliding conditions. TiN and CrN coatings have been developed and used by industry in numerous tribological applications including, machining, manufacturing and transportation. In contrast, MoN has attracted very little attention as a tribological coating in the past, despite being much harder than both TiN and CrN. In this paper, we will mainly concentrate on the Cu-doped versions of these coatings whose tribological properties have not yet been fully explored. The results of this study have confirmed that the addition of Cu into TiN, CrN and MoN coatings has indeed modified the grain size and morphology, but had a beneficial effect only on the friction and wear behavior of MoN. The tribological behavior of CrN did not change much with the addition of Cu but that of TiN became worse after Cu additions. Raman spectroscopy technique was used to elucidate the structural and chemical natures of the oxide films forming on sliding surfaces of Cu-doped TiN, CrN and MoN films. The differences in the friction and wear behavior of Cu-doped TiN, CrN, and MoN is fully considered and a mechanistic explanation has been provided using the principles of a crystal chemical model that can relate the lubricity of complex oxides to their ionic potentials.

Original languageEnglish
Pages (from-to)49-59
Number of pages11
JournalTribology International
Issue number1
Publication statusPublished - Jan 2008


This work was supported by State Planning Organization of Turkey through the “Advanced Technologies in Engineering” and Production and Development of Low Wear and Low Friction Coefficient Providing Nano-composite Coatings for High Temperature and Power Systems” projects. This work was also partially supported by the US Department of Energy, Office of Freedom Car and Vehicle Technologies Program, under contract W-31-109-Eng-38.

FundersFunder number
State Planning Organization of Turkey
US Department of EnergyW-31-109-Eng-38


    • Crystal chemistry
    • Friction and wear
    • Hydrid PVD techniques
    • Nanocomposite coatings
    • Raman spectroscopy


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