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Coatings 2018, 8(2), 66; https://doi.org/10.3390/coatings8020066

Hydrogen Permeation, and Mechanical and Tribological Behavior, of CrNx Coatings Deposited at Various Bias Voltages on IN718 by Direct Current Reactive Sputtering

1
Department of General Physics, National Research Tomsk Polytechnic University, Tomsk 634050, Russia
2
Physical Metallurgy and Materials Technology, Brandenburg Technical University, 03046 Cottbus, Germany
3
Department of Linguistic, Potsdam University, 14469 Potsdam, Germany
4
Institute of Chemistry, Saint Petersburg State University, St. Petersburg 199034, Russia
*
Author to whom correspondence should be addressed.
Received: 5 December 2017 / Revised: 30 January 2018 / Accepted: 4 February 2018 / Published: 9 February 2018
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Abstract

In the current work, the microstructure, hydrogen permeability, and properties of chromium nitride (CrNx) thin films deposited on the Inconel 718 superalloy using direct current reactive sputtering are investigated. The influence of the substrate bias voltage on the crystal structure, mechanical, and tribological properties before and after hydrogen exposure was studied. It was found that increasing the substrate bias voltage leads to densification of the coating. X-ray diffraction (XRD) results reveal a change from mixed fcc-CrN + hcp-Cr2N to the approximately stoichiometric hcp-Cr2N phase with increasing substrate bias confirmed by wavelength-dispersive X-ray spectroscopy (WDS). The texture coefficients of (113), (110), and (111) planes vary significantly with increasing substrate bias voltage. The hydrogen permeability was measured by gas-phase hydrogenation. The CrN coating deposited at 60 V with mixed c-CrN and (113) textured hcp-Cr2N phases exhibits the lowest hydrogen absorption at 873 K. It is suggested that the crystal orientation is only one parameter influencing the permeation resistance of the CrNx coating together with the film structure, the presence of mixing phases, and the packing density of the structure. After hydrogenation, the hardness increased for all coatings, which could be related to the formation of a Cr2O3 oxide film on the surface, as well as the defect formation after hydrogen loading. Tribological tests reveal that hydrogenation leads to a decrease of the friction coefficient by up to 40%. The lowest value of 0.25 ± 0.02 was reached for the CrNx coating deposited at 60 V after hydrogenation. View Full-Text
Keywords: CrNx coatings; Physical Vapour Deposition (PVD); hydrogenation; Tribology; mechanical properties; X-ray diffraction CrNx coatings; Physical Vapour Deposition (PVD); hydrogenation; Tribology; mechanical properties; X-ray diffraction
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Kashkarov, E.B.; Obrosov, A.; Sutygina, A.N.; Uludintceva, E.; Mitrofanov, A.; Weiß, S. Hydrogen Permeation, and Mechanical and Tribological Behavior, of CrNx Coatings Deposited at Various Bias Voltages on IN718 by Direct Current Reactive Sputtering. Coatings 2018, 8, 66.

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