Structure, Adhesion Strength and Corrosion Resistance of Vacuum Arc Multi-Period NbN/Cu Coatings

Authors

  • Hanna Oleksandrivna Postelnyk Kharkiv Polytechnic Institute, National Technical University, Kharkiv, 61002, Ukraine
  • O.V. Sobol Kharkiv Polytechnic Institute, National Technical University, Kharkiv, 61002, Ukraine
  • O. Chocholaty University of West Bohemia, Univerzitní 2732/8, 301 00 Pilsen, Czech Republic
  • G.I. Zelenskaya Kharkiv Polytechnic Institute, National Technical University, Kharkiv, 61002, Ukraine

DOI:

https://doi.org/10.30564/jmmr.v3i1.1364

Abstract

The influence of deposition modes on the phase-structural state, corrosion resistance, and adhesive strength of vacuum-arc multi-period NbN/Cu coatings is studied. It was found that in thin layers (about 8 nm, in a constant rotation mode), regardless of the change in the pressure of the nitrogen atmosphere, a metastable δ - NbN phase forms (cubic crystal lattice of the NaCl type). At a layer thickness of ~ 40 nm or more, a phase composition changes from the metastable δ - NbN to the equilibrium ε - NbN phase with a hexagonal crystal lattice. In the presence of the ε - NbN phase in the niobium nitride layers, the highest adhesive strength is achieved with a value of LС5 = 96.5 N. Corrosion resistance tests have shown that for all the studied samples the corrosion process has mainly an anodic reaction. The highest corrosion resistance was shown by coatings obtained at a pressure of 7·10-4 Torr, with the smallest bias potential of -50 V and the smallest layer thickness; with a thickness of such a coating of about 10 microns, its service life in the environment of the formation of chloride ions is about a year.

Keywords:

Vacuum Arc Method; NbN/Cu; Phase Composition; Adhesion Strength; Impedance Spectroscopy; Polarization Resistance

References

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How to Cite

Postelnyk, H. O., Sobol, O., Chocholaty, O., & Zelenskaya, G. (2020). Structure, Adhesion Strength and Corrosion Resistance of Vacuum Arc Multi-Period NbN/Cu Coatings. Journal of Metallic Material Research, 3(1), 1–6. https://doi.org/10.30564/jmmr.v3i1.1364

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