Tribological properties of duplex treated TiN/TiCN coatings on plasma nitrided PH15-5 steel |
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Authors: | I. Zukerman Y. Landau R. Shneck H. Kalman L. Martinu |
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Affiliation: | a Ben Gurion University, P.O. Box 653, Beer Sheva 84105, Israel b Division of Chemistry, NRC-Negev, P.O.Box 9001, Beer-Sheva 84190, Israel c Iscar LTD., Tepen, Israel d Engineering Physics Department, Ecole Polytechnique, Box 6079, Station A, Montreal, Canada H3C 3A7 |
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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. |
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Keywords: | Plasma Duplex treatment Wear Erosion |
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