Effect of Cu Content on the Structure,and Performance of Substoichiometric Cr–N Coatings |
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Authors: | Kyriaki Polychronopoulou Nicholaos G Demas Peter N Gibson Claus Rebholz Andreas A Polycarpou |
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Affiliation: | (1) Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, 1206 West Green St., Urbana, IL 61801, USA;(2) Department of Mechanical and Manufacturing Engineering, University of Cyprus, 1678 Nicosia, Cyprus;(3) Institute for Health and Consumer Protection, Joint Research Centre of the European Commission, 21027 Ispra, VA, Italy;(4) Argonne National Laboratory, Argonne, IL 60439, USA |
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Abstract: | Cu–Cr–N coatings with Cu contents between 3 and 65 at.%, Cu/Cr ratios in the 0.04–4.5 range and 21–27 at.% N, synthesized
by twin electron-beam Physical Vapor Deposition at 450 °C, were investigated and compared against substoichiometric Cr–N reference
samples. The main objective of this study is to study the influence of Cu on the structure, and the subsequent effects on
the mechanical properties, room (22 °C) and high temperature (500 and 840 °C) tribological performance of Cu–Cr–N coatings.
Using X-ray photoelectron spectroscopy, glancing angle X-ray diffraction and scanning electron microscopy, in combination
with nanoindentation mechanical property measurements and laboratory-controlled ball-on-disc sliding experiments, it is shown
that Cu–Cr–N coatings with low Cu content (3 at.%) possess sufficient wear resistance for high-temperature demanding tribological
applications. The lubricious effect of oxide formation at high temperatures is also evaluated. |
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