Abstract
A comprehensive study is performed on the effect of vacuum arc conditions on the formation of TiCN coatings, specifically focusing on parameters such as the bias potential applied to the substrate, nitrogen partial pressure, and the composition of the C2H2–N2 gas mixture. Our investigation encompassed analyses of the coatings’ chemical composition, structure (lattice parameter, texture factor, orientation, grain size, level of microstrains), and mechanical properties (microhardness, adhesion strength indicators, and coefficient of friction). The results reveal that the coatings predominantly exhibit a polycrystalline nature and possess a cubic B1-NaCl structure, characterized by visible diffraction peaks in the range of 2θ from 30° to 80°, corresponding to reflections (111), (200), (220), and (222). The lattice parameter of TiN was found to increase from 0.4291 to 0.4301 nm with variations in the concentration of C2H2, while the texture coefficient concurrently increased from 5.91 to 5.97. The hardness of the coatings at a bias potential Ubias = –200 V exhibited variation from 31.7 to 33.9 GPa, depending on the C/N ratio. Variations in the elemental composition of the coatings led to changes in adhesion strength, with failure occurring at a load F = 62.1 N. The coefficient of friction was measured at μ = 0.45 under these conditions.
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Funding
The work was supported by the National Research Fund of Ukraine as part of the project “Development of composites based on cubic boron nitride with protective nanostructured coatings, study of their physico-mechanical and operational properties in the conditions of manufacturing aviation equipment” (project no. 2022.01/0046) (the winning project of the competition “Science for the Recovery of Ukraine in Military and Post-War Periods”).
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Klymenko, S.A., Lytovchenko, S.V., Klymenko, S.A. et al. Properties of Titanium Carbonitride TiCN Coatings Obtained by Vacuum Arc Deposition. J. Superhard Mater. 46, 204–211 (2024). https://doi.org/10.3103/S1063457624030055
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DOI: https://doi.org/10.3103/S1063457624030055