Investigation of the nanostructure and wear properties of physical vapor deposited CrCuN nanocomposite coatings

M. A. Baker, P. J. Kench, C. Tsotsos, P. N. Gibson, A. Leyland, A. Matthews
2005 Journal of Vacuum Science & Technology. A. Vacuum, Surfaces, and Films  
This paper presents results on the PVD CrCuN nanocomposite coating system, in which the immiscibility of Cr (containing a supersaturation of nitrogen) and Cu offers the potential of a predominantly metallic (and therefore tough) nanocomposite, composed of small Cr(N) metallic and/or β-Cr 2 N ceramic grains interdispersed in a (minority) Cu matrix. A range of CrCuN compositions have been deposited using a hot-filament enhanced unbalanced magnetron sputtering system. The stoichiometry and
more » ... cture have been studied by XPS, TEM, SEM and XRD. Hardness, wear resistance and impact resistance have been determined by nanoindentation, reciprocating-sliding and ball-onplate high-frequency impact. Evolution of the nanostructure as a function of composition and correlations of the nanostructure and mechanical properties of the CrCuN coatings are discussed. A nanostructure comprising of 1-3 nm -Cr(N) and β-Cr 2 N grains separated by intergranular regions of Cu give rise to a coating with significantly enhanced resistance to impact wear.
doi:10.1116/1.1875212 fatcat:ctcllutdinf3ref3363ptuurrq