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Постійне посилання на розділhttps://repository.kpi.kharkov.ua/handle/KhPI-Press/35393
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Документ Influence of the magnitude of the bias potential and thickness of the layers on the structure, substructure, stress-deformed state and mechanical (TiMo)N/(TiSi)N coatingsl characteristics of vacuum-arc multi-layered(2020) Sobol, O. V.; Postelnyk, H. O.; Meylekhov, A. A.; Subbotina, V. V.; Stolbovoy, V. A.; Dolomanov, A. V.; Kolesnikov, D. A.; Kovaleva, M. G.; Sukhorukova, Yu. V.Layers based on titanium nitride doped with molybdenum and silicon were used to create a multilayer composite. In this case, the mismatch between the lattice periods of (TiMo)N and (TiSi)N layers was about 1%. It was found that in the (TiMo)N/(TiSi)N multilayer composite, such a mismatch of the periods in the constituent layers does not change the single-phase state of the composite even at relatively large layer thicknesses (about 350 nm). The creation of a (TiMo)N/(TiSi)N composite with a nanometer layer thickness allows one to reduce the magnitude of macrostresses (a large value of which is characteristic of single-layer (TiMo)N coatings) and change the substructural characteristics in a wide range of values. It has been established that the use of multi-element (TiMo)N and (TiSi)N layers in a multilayer coating design allows one to achieve a high-hard state with high adhesive strength and good tribological characteristics. The highest properties (hardness – 34.8 GPa and adhesive strength 166.09 N) were achieved in coatings obtained at Ub = -200 V and a layer thickness of 80 nm, which are characterized by compression macrostresses of 7.85 GPa and microstrains 0.75%.Документ Structure and corrosion resistance of vacuum-arc multi-period CrN/Cu, ZrN/Cu and NbN/Cu coatings(2020) Postelnyk, H. O.; Sobol, O. V.; Stolbovoy, V. A.; Serdiuk, I. V.; Chocholaty, O.The structure and properties of vacuum-arc multi-period composite coatings of the MeN/Cu system (where Me is Cr, Zr, and Nb) are studied. It was found that at the smallest nanolayer thickness (about 8…10 nm) of composites in the layers of all systems, only a phase with an fcc lattice is formed, without a pronounced texture in the nitride layers. For ZrN and CrN, the phases with an fcc lattice are equilibrium, and for NbN, they are nonequilibrium. An increase in the thickness of nitride layers leads to the appearance of a texture in ZrN/Cu and CrN/Cu systems and the formation of an equilibrium ε-NbN phase in the layers of the NbN/Cu system. Tests for corrosion resistance in the environment of the formation of chloride ions showed that the coatings are anodic reaction. The best corrosion properties were obtained for coatings with the smallest layer thickness (about 8…10 nm).Документ The use of negative bias potential for structural engineering of vacuum-arc nitride coatings based on high-entropy alloys(2019) Sobol, O. V.; Andreev, A. A.; Gorban, V. F.; Postelnyk, H. O.; Stolbovoy, V. A.; Zvyagolsky, A. V.; Dolomanov, A. V.; Kraievska, Zh. V.The effect of negative bias potential (Ub = -40, -110, and -200 V) during the deposition of multi-element coatings on their composition, structure and mechanical properties was studied. It was established that during the transition from a multi-element alloy to a nitride, a single-phase state possible to form on its basis (based on the fcc metal lattice, structural type NaCl). In this case, the composition (FeCoNiCuAlCrV)N of coatings with increasing Ub is depleted by the element with the lowest enthalpy of formation of nitride (Cu). In (AlCrTiNbSi)N and (AlCrTiZrNbV)N coatings, the content of low-mass elements (Si and Al) decreases with increasing Ub. In (TiZrHfVNb)N coatings of strong nitride-forming elements with increasing Ub to 200 V, the composition practically does not change. The structure of such coatings is characterized by the presence of a texture with the [111] axis. The presence of weak nitride-forming elements in (FeCoNiCuAlCrV)N coatings leads to the formation of texture [110] for large Ub = 110…200 V. In such coatings, the hardness does not exceed 35 GPa. It is shown that to achieve high hardness at high Ub it is necessary to increase the content in the high-entropy alloy of elements with high nitride-forming ability. In this case, in (TiZrHfVNb)N coatings (made of strong nitride-forming elements with a large mass) at Ub = 200 V, the hardness exceeds 45 GPa.