Факультет електроніки та інформаційних технологій (ЕлІТ)
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Item Structure and physical and mechanical properties of nanocomposite coatings of the system (Zr-Ti-Cr-Nb)N, obtained by vacuum-arc evaporation method(Національний научний центр "Харківський фізико-технічний інститут", 2014) Погребняк, Олександр Дмитрович; Погребняк, Александр Дмитриевич; Pohrebniak, Oleksandr Dmytrovych; Serduyk, I.V.; Toryanik, I.N.; Sobol, O.V.; Druchinina, O.A.; Kovalyova, M.G.; Turbin, P.V.; Nyemchenko, U.S.; Kolesnikov, D.A.; Dmytrenko, A.E.; Береснев, В.М.; Береснев, В.М.; Beresnev, V.M.Методом вакуумно-дугового випаровування суцільнолитого катода із застосуванням імпульсної стиму- ляції отримані нанокомпозитні покриття системи (Zr-Ti-Сr-Nb)N. Структура покриттів характеризується розміром кристалітів 5…10 нм. Підвищення потенціалу зсуву призводить до більш інтенсивного нітридоутворення, при цьому збільшуючи відносний вміст атомів Ti та Cr і підвищуючи твердість до 4500 HV0,1 ГПа. Склерометричні дослідження показали високу адгезійну міцність, що у комплексі з високою твердістю обумовлює перспективне застосування покриттів у якості захисних для різального інструменту.Item Changing of defect’s structure and properties of superhard nanostructured Ti-Si-N coatings, fabricated using CPVD, before and after annealing(Scientific Research, 2013) Погребняк, Олександр Дмитрович; Погребняк, Александр Дмитриевич; Pohrebniak, Oleksandr Dmytrovych; Бондар, Олександр В`ячеславович; Бондарь, Александр Вячеславович; Bondarenko, Oleksandr Viacheslavovych; Соболь, О.В.; Sobol, O.V.; Береснев, В.М.; Beresnev, V.M.Using such unique methods of analysis as slow positron beam (SPB), RBS, μ-PIXE (proton microbeam), XRD, SEM with EDS, XPS, nanohardness and elastic modulus measurements, we studied superhard nanostructure Ti-Si-N coatings, which were deposited using Cathodic-PVD method, before and after annealing at the temperature of 600°C for 30 minutes. It is shown in the paper that redistribution of N and Si occurs on the borders of nanograins after annealing, amorphous phase α-SiNx (Si3N4) is created, defects segregates on interfaces and forms vacancy-type clusters with rather high concentration from 5 × 10[16] cm-3 to 7.5 × 10[17] cm-3 due to thermodiffusion. Solid solution (Ti,Si)N and small concentration of α-SiN (close to XRD detection limits) are formed in the coating. Also it was obtained, that deflected mode is formed in the coating (compressive deformation equals to –2.6%), but after thermal annealing deformation reduces to a value of -2.3%. Size of nanograins of solid solution (Ti, Si)N increases from 12.5 nm to (13.2 ÷ 13.4) nm. 25 nm size grains increase their size to 28.5 nm after annealing (under another deposition regime). When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/33948Item Physical-Mechanical Properties of Superhard Nanocomposite Coatings on Base Zr-Ti-Si-N(2013) Погребняк, Олександр Дмитрович; Погребняк, Александр Дмитриевич; Pohrebniak, Oleksandr Dmytrovych; Байдак, В.; Baydak, V.; Береснев, В.М.; Beresnev, V.M.; Турбин, П.; Turbin, P.; Махмудов, Н.; Makhmudov, N.; Ілляшенко, Максим Вікторович; Ильяшенко, Максим Викторович; Illiashenko, Maksym Viktorovych; Колесников, Д.; Kolesnikov, D.; Ташметов, М.; Tashmetov, M.Hard and super hard coatings of Zr-Ti-Si-N of from 2.8 μm to 3.5 μm thickness were fabricated using a vacuum arc source with high frequency stimulation. The samples were annealed in vacuum and in air at 1200 °C. It was found that films with a high Zr and Ti content were thermally stable up to 1180 °C. At the same time, a thin oxide layer of 180 nm to 240 nm was found on the surfaces, which protected the sample from destruction. Below 1000 °C annealing temperature in vacuum, changing of phase composition is determined by appearing of siliconitride crystallites (ß-Si3N4) with hexagonal crystalline lattice and by formation of ZrO2 oxide crystallites. Size of grains of a substitution solid solution (Zr, Ti)N varied from (10 – 12) nm to 25 nm, but Ti concentration in the solid solution increased. In the process of annealing, hardness of the best series of samples increased from (39.6 ±1.4) GPa to 53.6 GPa, which seemed to indicate that a spinodal segregation along grain interfaces was finished. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/33942Item Multicomponent (Ti-Zr-Hf-V-Nb)N nanostructure coatings fabrication, high hardness and wear resistance(Polish Academy of Sciences Institute of Physics, 2013) Погребняк, Олександр Дмитрович; Погребняк, Александр Дмитриевич; Pohrebniak, Oleksandr Dmytrovych; Береснев, В.М.; Beresnev, V.M.; Колесников, Д.А.; Kolesnikov, D.A.; Бондар, Олександр В`ячеславович; Бондарь, Александр Вячеславович; Bondar, Oleksandr Viacheslavovych; Takeda, Y.; Oyoshi, K.; Каверін, Михайло Валерійович; Каверин, Михаил Валерьевич; Kaverin, Mykhailo Valeriiovych; Соболь, О.В.; Sobol, O.V.; Krause-Rehberg, R.; Karwat, C.First results in the field of synthesis and research of the multicomponent (Ti-Zr-Hf-V-Nb)N nanostructured coatings are presented in the paper. Influence of processes of spinodal segregation and mass-transfer on single--layered or multilayered crystal boundary (second phase) forming were explored. Superhard nanostructured coatings were investigated before and after annealing at the temperature 600 C using unique methods (slow positron beam, proton microbeam particle induced X-ray emission, Rutherford backscattering-analysis, scanning electron microscopy with energy dispersive X-ray spectroscopy, X-ray diffraction analysis was performed using DRON-4 and nanoindentor). Di raction spectra were taken point-by-point, with a scanning step 2 = 0.05 to 0.1. We detected that positron trapping by defects was observed on the nanograins boundaries and interfaces (vacancies and nanopores which are the part of triple and larger grain's boundary junction). The 3D distribution maps of elements obtained by the proton microbeam (particle induced X-ray emission- ) together with the results obtained by slow positron microbeam gave us comprehensive information about physical basis of the processes, connected with diffusion and spinodal segregation in superhard coatings. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/33937Item Formation of multilayered Ti-Hf-Si-N/NbN/Al2O3 coatings with high physical and mechanical properties(Polish Academy of Sciences Institute of Physics, 2013) Погребняк, Олександр Дмитрович; Погребняк, Александр Дмитриевич; Pohrebniak, Oleksandr Dmytrovych; Prozorova, M.S.; Kovalyova, M.G.; Kolisnichenko, O.V.; Береснев, В.М.; Beresnev, V.M.; Oyoshi, K.; Takeda, Y.; Каверіна, Аліса Шер Ахмад; Каверина, Алиса Шер Ахмад; Kaverina, Alisa Sher Akhmad; Шипиленко, Андрій Павлович; Шипиленко, Андрей Павлович; Shypylenko, Andrii PavlovychThis work presents the first results on forming of multi-layered superhard coatings Ti-Hf-Si-N/NbN/Al2O3 and their properties as well as structure. Microstructure, elemental and phase compositions of multi-layered coatings obtained by different methods were investigated. There were used such methods as: scanning electron microscopy EDS JEM-7000F microscope (with microanalysis) for research of cross-section of coatings, with subsequent Auger-electron spectroscopy, X-ray diffraction analysis, optical inverted microscope Olympus GX51, electron-ion microscopes Quanta 200 3D and Quanta 600 (scanning electron microscopy), equipped by the detector of X-ray radiation of the system PEGASUS 2000. It was stated that hardness of coatings has reached 56 GPa, and at the same time the factor of wearing during friction was the smallest 2.571x10(-5). It was also noted that nitrogen pressure in the chamber at the deposition of the top layer significantly influences on the properties of samples. For example, the coe cient of friction at P = 0:3 Pa from 0.2 at the beginning of track to 0.001 (during the tests), and at the pressure of nitrogen P = 0:8 Pa, the coefficient of friction was equal to 0.314 at the beginning of track and 0.384 at the end (during the tests). When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/33936Item Hard nanocomposite coatings, their structure and properties(Published by InTech, 2012) Погребняк, Олександр Дмитрович; Погребняк, Александр Дмитриевич; Pohrebniak, Oleksandr Dmytrovych; Береснев, В.М.; Береснев, В.Н.; Beresnev, V.M.