Факультет електроніки та інформаційних технологій (ЕлІТ)
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Item Specific Features of the Microstructure and Properties of Multielement Nitride Coatings Based on TiZrNbAlYCr(Pleiades Publishing, Ltd., 2018) Погребняк, Олександр Дмитрович; Погребняк, Александр Дмитриевич; Pohrebniak, Oleksandr Dmytrovych; Бондар, Олександр В`ячеславович; Бондарь, Александр Вячеславович; Bondar, Oleksandr Viacheslavovych; Кравченко, Ярослав Олегович; Кравченко, Ярослав Олегович; Kravchenko, Yaroslav Olehovych; Beresnev, V.M.; Zhollybekov, B; Kupchishin, A.I.Multicomponent nanostructured coatings based on (TiZrNbAlYCr)N with a hardness as high as 47 GPa were obtained by cathodic arc deposition. The effect of partial nitrogen pressure PN (with constant bias potential Ub = –200 V applied to the substrate) on the phase-composition variation, the size of crystallites, and their relation to the microstructure and hardness was investigated. An increase in the nitrogen pressure resulted in the formation of two phases with characteristic BCC (the lattice period is 0.342 nm) and FCC lattices with averaged nanocrystallite sizes of 15 and 2 nm. At a high pressure of 0.5 Pa, crystallites in the FCC phase with a lattice period of 0.437 nm grew in size to ~7 nm. The hardness of deposited coatings with larger (3.5 nm) FCC-phase crystallites and smaller (7 nm) BCC-phase crystallites was enhanced considerablyItem Features of Investigations of Multilayer Nitride Coatings Based on Cr and Zr(G.V. Kurdyumov Institute for Metal Physics, National Academy of Sciences of Ukraine, 2018) Максакова, Ольга Василівна; Максакова, Ольга Васильевна; Maksakova, Olga Vasylivna; Погребняк, Олександр Дмитрович; Погребняк, Александр Дмитриевич; Pohrebniak, Oleksandr Dmytrovych; Beresnev, V.M.У короткому огляді літературних даних узагальнено результати дослі- джень структури та властивостей наномасштабних багатошарових пок- риттів тугоплавких металів на основі Zr та Cr одержаних методами ва- куумно-дугового осадження катоду. Проведено порівняльну аналізу мі- кроструктури та властивостей композиційних покриттів ZrN/CrN в за- лежності від умов осадження (постійного неґативного потенціялу під- ложжя, імпульсного високовольтного потенціялу зміщення, парціяль- ного тиску і швидкости потоку робочого газу) та періоду модуляції ба- гатошарової структури. Виявлено загальні закономірності, що поляга- ють у наявності стовпчастої структури та текстури росту. Показано, що для досліджуваних покриттів має місце переважна орієнтація (111). Визначено умови одержання покращених фізико-механічних та трибо- логічних властивостей покриттів.Item The effects of Cr and Si additions and deposition conditions on the structure and properties of the (Zr-Ti-Nb)N coatings(Elsevier, 2017) Погребняк, Олександр Дмитрович; Погребняк, Александр Дмитриевич; Pohrebniak, Oleksandr Dmytrovych; Багдасарян, Артем Анатолійович; Багдасарян, Артем Анатольевич; Bahdasarian, Artem Anatoliiovych; Кравченко, Ярослав Олегович; Кравченко, Ярослав Олегович; Kravchenko, Yaroslav Olehovych; Beresnev, V.M.; Nyemchenko, U.S.; Ivashchenko, V.I.; Shaimardanov, ZH.K.; Plotnikov, S.V.; Maksakova, O.In this study, (Zr-Ti-Nb)N, (Zr-Ti-Cr-Nb)N and (Zr-Ti-Cr-Nb-Si)N nitride coatings were obtained using a well-developed vacuum arc deposition. The systematical investigations demonstrate that the chemical composition, microstructure, and properties of the coatings intimately rely on the deposition parameters (pressure of working gas and substrate bias). Effects of Cr and Si additions on microstructure and mechanical properties of the (Zr-Ti-Nb)N coatings have been investigated using scanning electron microscopy (SEM) equipped with energy dispersive spectrum (EDS), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), transmission electron microscope (TEM), hardness measurements and adhesion testing. First-principles band-structure calculations and Gibbs-Rosenbaum triangle representation have been used to investigate the elemental and phase compositions in nitride coatings. The multi-component (Zr-Ti-Cr-Nb-Si)N and (Zr-Ti-Nb)N coatings are found to be a simple face-centered cubic (FCC) solid solution. For the coatings without Si, the structure is mainly composed of TiN fcc phase and Cr2N trigonal modification. The hardness values were in the ranges (24–42 GPa). The (Zr-Ti-Nb)N, (Zr-Ti-Cr-Nb)N coatings provided the best adhesive strength in different conditions. The (Zr-Ti-Cr-Nb-Si)N coatings exhibited the worst adhesive strength, which may be attributed to the relative low hardness.Item Influence of the High-Temperature Annealing on the Structure and Mechanical Properties of Vacuum–Arc Coatings from Mo/(Ti + 6 wt % Si)N(Allerton Press, Inc., 2017) Beresnev, V.M.; Klimenko, S.A.; Sobol, O.V.; Погребняк, Олександр Дмитрович; Погребняк, Александр Дмитриевич; Pohrebniak, Oleksandr Dmytrovych; Litovchenko, S.V.; Srebnyuk, P.A.; Kolesnikov, D.A.; Meilekhov, A.A.; Postel’nik, A.A.; Nemchenko, A.A.Scanning electron microscopy with energy dispersive element microanalysis, X-ray structural analysis, and microindentation were used to study the effect of the deposition conditions in a reactive nitrogen atmosphere on the growth morphology, phase composition, structure, and microhardness of vacuum–arc multilayer coatings produced by the evaporation of cathodes from Mo and (Ti + 6 wt % Si) both after their deposition and after high?temperature annealing. It has been established that the use of the composite cathode of Ti and Si allows the formation of the structure state inclined to ordering to form a two-phase compound from TiN and Ti5Si3 at high-temperature annealing. In this case the coating hard? ness increases to a value higher than 45 GPa.Item Influence of deposition parameters on the structure and properties of nitride coatings(One Central Press, 2014) Погребняк, Олександр Дмитрович; Погребняк, Александр Дмитриевич; Pohrebniak, Oleksandr Dmytrovych; Azarenkov, N.A.; Beresnev, V.M; Litovchenko, S.V.High-entropy alloys (HEAs) – are multicomponent alloys containing five or more principal elements, mixed in equiatomic ratios [1]. The main difference between conventional multi-component alloys and HEAs is that HEAs don’t have a dominant principle element; and this concept is a breakthrough in the field of alloys development [2-10]. Phase composition investigations of high-entropy alloys evidence, that predominantly only one solid-solution phase with fcc and/or bcc lattice, or amorphous phase is formed in HEAs. Formation of the various phases is not observed. Such structural stability promotes improves the physical and mechanical characteristics of HEAs. Various nitrides ([11-19]) and carbides [20] based on high-entropy were investigated. High mechanical hardness and Young modulus, high durability and corrosion resistance, thermal stability make highentropy alloys one of the promising and interesting materials in science.Item Structure and Physicomechanical Properties of NbN-Based Protective Nanocomposite Coatings: A Review(Pleiades Publishing, Ltd, 2016) Погребняк, Олександр Дмитрович; Погребняк, Александр Дмитриевич; Pohrebniak, Oleksandr Dmytrovych; Бондар, Олександр В`ячеславович; Бондарь, Александр Вячеславович; Bondar, Oleksandr Viacheslavovych; Rogoz, V.M.; Erdybaeva, N.K.; Plotnikov, S.V.This review summarizes the present-day achievements in the study of the structure and properties of protective nanocomposite coatings based on NbN, NbAlN, and NbSiN prepared by a variety of modern deposition techniques. It is shown that a change in deposition parameters has a significant effect on the phase composition of the coatings. Depending on the magnitude of negative potential on the substrate, the pressure of nitrogen or a nitrogen–argon mixture in the chamber, and the substrate temperature, it is possible to obtain coatings containing different phases, such as NbN and SiNx (Si3N4), AlN, and NbAl2N. It is found that, in the case of formation of the ε-NbN phase, the coatings become very hard; their hardness achieves values on the order of 53 GPa. At the same time, they remain thermally stable at temperatures of up to 600°C, chemically inert, and resistant to wear. The effect of the nanograin size, the volume fraction of boundaries and interfaces, and the point defect concentration on the physicomechanical properties of these coatings is described. Niobium nitride-based coatings can be used in superconducting systems and single-photon detectors; they are capable of operating under the action of strong magnetic fields of up to 20 T; they can be used in integrated logic circuits and applied as protective coatings of machine parts, edges of cutting tools, etc.Item Functional properties of multilayer vacuum-arc TiN/ZrN coatings(IOP Publishing, 2016) Погребняк, Олександр Дмитрович; Погребняк, Александр Дмитриевич; Pohrebniak, Oleksandr Dmytrovych; Plotnikov, S.V.; Tleukenov, Y.O.; Erdybaeva, N.K.Nanostructured multilayer Ti/ZrN coatings were synthesized by vacuum-arc deposition with a number of layers 134-533 and an average thickness 20-125nm of layers. A good planarity was revealed resulting in a range of nanometer layer from plasma streams in a reactive environment. Phase-structural changes mechanisms were established as a model of critical operating coatings’ conditions of in the surface layers under the action of an aggressive oxygen atmosphere at high temperature (700 0C). The thickness parameter effect on its hardness of the multilayer system was shown. It was found that the maximum hardness of 42 GPa and the lowest abrasion of coating 1,3 ×10–5 mm3×Н–1×mm–and counterbody 1,9 ×10–6 мм3×Н–1×мм–1 inherent in TiN/ZrN system with the smallest layer thickness of 20 nm in the period. The results are explained by the influence of the size factor interphase boundaries magnified in a multilayer system with a nanometer thick layers.Item Studying of nanocomposite films’ structure and properties obtained by magnetron sputtering(IOP Publishing, 2016) Tleukenov, Y.O.; Plotnikov, S.V.; Erdybaeva, N.K.; Погребняк, Олександр Дмитрович; Погребняк, Александр Дмитриевич; Pohrebniak, Oleksandr DmytrovychVarious approaches to creating multicomponent na-nocomposite coatings of high and superhigh hardness (from 30 to 100 ± 120 GPa) are reviewed with particular emphasis placed on mechanisms underlying the increase in hardness in thin coatings. Nanocomposite Nb-Al-N films fabricated by magnetron sputtering were researched in this work. Two stable crystalline structural states were found in the films: NbNch and solid solution В1-NbxAl1-xNyO1-y, and also an amorphous component associated with aluminum oxynitride with reactive magnetron sputtering. A relationship of substructural characteristics sensitivity with the current and nanohardness and Knoop hardness characteristic was determined in this paper. Recent changes in the range of 29-33.5 GPa and 46-48 GPa, respectively. Initial principle calculations of NbN and Nb2AlN phases and NbN/AlN heterostructures were carried out for the interpretation of the results. Deposited nanocomposite films with the given mechanical properties may be used as wear resistant or protective coatings. On the basis of these results, it can be assumed that two stable crystalline structural states were found in the films: В1-NbNx and solid solution with a composition close to the В1-Nb0.67Al0.33N. The films also contain an amorphous component associated with aluminum nitride.Item Structure engineering in vacuum-arc-deposited coatings of the MoN–CrN system(Pleiades Publishing, Ltd, 2016) Beresnev, V.M.; Sobol’, O.V.; Grankin, S.S.; Погребняк, Олександр Дмитрович; Погребняк, Александр Дмитриевич; Pohrebniak, Oleksandr Dmytrovych; Stolbovoi, V.A.; Turbin, P.V.; Meilekhov, A.A.; Arseenko, M.Yu.The possibilities of structure engineering in multilayer coatings of the MoN–CrN system with relatively low heats of formation of component transition metal nitrides are demonstrated by varying pressure PN of reactive gas (nitrogen) and negative bias voltage –Us applied to a metal substrate. It is established that, by changing PN from 7 × 10–4 to 3 × 10–3 Torr, it is possible to obtain coatings in two significantly different structural-phase states. A multilayer nonisostructural composite with hexagonal crystalline lattice in CrN layers and cubic type lattice in MoN layers is formed at low pressure, whereas an isostructural state with cubic lattice in both nitride layers is formed at high pressure. The existence of two types of structural states allows multilayer coatings with controlled hardness to be obtained, which reaches 38 GPa in the isostructural state.Item Arc-Evaporated Nanoscale Multilayer Nitride-Based Coatings for Protection Against Wear, Corrosion, and Oxidation((Институт металлофизики им. Г.В. Курдюмова НАН Украины), 2016) Погребняк, Олександр Дмитрович; Погребняк, Александр Дмитриевич; Pohrebniak, Oleksandr Dmytrovych; Beresnev, M.V.; Ivasishin, O.M.У короткому огляді узагальнено результати досліджень структури та властивостей наномасштабних багатошарових покриттів нітридів тяжкотопких металів. На прикладі TiN/MoN-, TiN/ZrN-, CrN/MoN- та більш складних (багатошарових) (TiZrNbTaHf)N/WN:(TiZrNbTaHf)N/MoN-покриттів, одержаних методою вакуумно-дугового осадження катоду, досліджено та проаналізовано залежності їх твердости, зносостійкости, тертя, корозії й окиснення від умов осадження та товщини шарів. Відмічено закономірності структури та властивостей поведінки даних наномасштабних багатошарових покриттів від розміру нанозерен, текстури та напруг, що виникають у цих покриттях.