Tribological properties of twin electron-beam evaporated Cr-N and Al-Cr-N coatings under laboratory sliding and drill experiments

Kyriaki Polychronopoulou, Nicholaos G. Demas, Claus Rebholz, Andreas A. Polycarpou

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

The tribological behavior of substoichiometric Cr-N and Al-Cr-N coatings prepared by twin electron-beam evaporation at 450°C was studied. Al-Cr-N coatings with Al to Cr ratios in the range of 1-8 (and nitrogen concentrations of ~45 at.%) were synthesized and compared to Cr-N reference samples. The focus of this work is on Al-Cr-N (Al ≥ 30 at.%) coatings with the aim of (a) replacing Cr with Al due to environmental concerns and (b) achieving improved mechanical properties, and tribological performance. The composition, structure, mechanical and tribological properties of the coatings were determined using X-ray photoelectron spectroscopy, X-ray diffraction, and scanning electron microscopy in combination with nanoindentation measurements, laboratory controlled ball-on-disk sliding experiments, and wet and dry drilling experiments. It was found that all Al-Cr-N coatings exhibit higher hardness values compared to Cr-N coatings. Al-Cr-N coatings with Al contents and Al/Cr ratios of ≤38 at.% and ≤1.7, respectively, showed better performance than the rest of the coatings during both drilling and laboratory tribological experiments.

Original languageBritish English
Pages (from-to)117-127
Number of pages11
JournalTribology Letters
Volume32
Issue number2
DOIs
StatePublished - Nov 2008

Keywords

  • Aluminum
  • Chemical analytical techniques
  • Chromium
  • Coatings
  • EDX
  • Friction measurements
  • Hardness
  • Nitrides
  • Wear-resistant
  • XPS
  • XRD

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