Перегляд за автором "Horokh, D. V."

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  • Зображення мініатюри
    Публікація
    Cathodic vacuum arc multilayer coatings (TiZrSiY)N/NbN : structure and properties depending on the deposition interval of alternate layers
    (2023) Beresnev, V. M.; Lytovchenko, S. V.; Azarenkov, M. O.; Maksakova, O. V.; Horokh, D. V.; Mazilin, B. O.; Kaynts, D.; Doshchechkina, I. V.; Gluhov, О. V.
    Two series of multilayer coatings with different numbers of bilayers (268 and 536, respectively) were synthesised using the cathodic vacuum-arc deposition (CVAD) with the simultaneous sputtering of two different cathodes. The first cathode was made of the multicomponent TiZrSiY material, and the second one was made of technical niobium. The coatings were condensed in a nitrogen atmosphere at a constant negative bias potential applied to the substrate. The resulting coatings have a distinct periodic structure composed of individual layers of (TiZrSiY)N and NbN with the thicknesses determined by the deposition interval (10 or 20 s, respectively). The total thicknesses of the coatings determined by the number of bilayers were 11 and 9 microns, respectively. The formation of polycrystalline TiN and NbN phases with grain size comparable to the size of the layers has been identified for both series of coatings. The layers exhibit a columnar structure growth with a predominant orientation (111). The hardness of the experimental coatings depends on the thickness of the layers and reaches 39.7 GPa for the coating with the smallest layer thickness. The friction coefficient of the obtained coatings varies from 0.512 to 0.498 and also depends on the thickness of the layers. A relatively large value of the friction coefficient is due to high roughness and the presence of a droplet fraction on the surface as well as in the volume of the coatings.
  • Зображення мініатюри
    Публікація
    Influence of the Bias Potential and Working Gas Pressure on the Properties of the TiSiN/NbN Ion Plasma Multilayer Coating
    (2022) Horokh, D. V.; Maksakova, O. V.; Klymenko, S. A.; Lytovchenko, S. V.; Beresnev, V. M.; Glukhov, O. V.
    The phase composition, element distribution, and mechanical properties of the TiSiN/NbN(TiN) multilayer coatings obtained by vacuum arc deposition are anlyzed. The effect of the bias potential on the mechanical and tribological characteristics of the coatings is studied, and the adhesion strengths of the coatings to the substrate are measured. The results of X-ray diffraction stud ies of the coatings show that a two-fold increase in the bias potential leads to increases in all phase and structural parameters—in particular, lattice parameters, crystallite sizes, and microdeformation levels of the components of the coatings. The intensities of δ diffraction peaks of TiN and NbN indicate the presence of a strong (200) texture. Tribotechnical studies of the coatings have shown that they are erased during scratching, but their detachment from the substrate has not been recorded. This means that the coatings are worn by the cohesive mechanism associated with plastic deformation and the for mation of fatigue cracks in the coating volume. Different modes of coating formation correspond to different values of acoustic emission that occurs, depending on the conditions, in the loading zone.