Tribological properties of duplex treated TiN/TiCN coatings on plasma nitrided PH15-5 steel

I. Zukerman, A. Raveh, Y. Landau, R. Weiss, R. Shneck, Y. Shneor, H. Kalman, J. E. Klemberg-Saphieha, L. Martinu

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

Nitriding was carried out in low pressure plasma excited by single- or dual-frequency discharge modes, at a substrate temperature of 523 K, followed by the deposition of 3 μm thick TiCN or TiN/TiCN coatings at a PH15-5 substrate temperature of 723 K. The nitrided layer was comprised of two distinct sublayers, namely a compound layer and a diffusion layer, with a total thickness of ∼ 60 μm. The compound layer was γ′-Fe4N and the diffusion layer was a solid solution of nitrogen in iron. The thickness of the compound layer fabricated by a single mode plasma is ∼ 5 μm, while that fabricated by dual-frequency mode plasma is ∼ 35 μm. It was found, using a ball-on-disk test, that the plasma nitrided layer fabricated by dual-frequency mode improved wear resistance by nearly one order of magnitude and improved the erosion resistance by a factor of two, compared with untreated steel. This improvement was common to the two nitriding treatments and both types of hard coatings. In particular, a thicker compound layer did not impair the wear resistance or the erosion resistance of the duplex treatment. The erosion resistance shows a linear dependence on the hardness of the uppermost nitrided or deposited layer.

Original languageEnglish
Pages (from-to)6171-6175
Number of pages5
JournalSurface and Coatings Technology
Volume201
Issue number13
DOIs
StatePublished - 26 Mar 2007

Keywords

  • Duplex treatment
  • Erosion
  • Plasma
  • Wear

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