Факультет електроніки та інформаційних технологій (ЕлІТ)
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Item Investigation of AC Electrical Properties of MXene-PCL Nanocomposites for Application in Small and Medium Power Generation(Centre of Sociological Research in co-operation with University of Szczecin (Poland); Széchenyi István University (Hungary); Mykolas Romeris University (Lithuania); Dubcek University of Trencín, Faculty of Social and Economic Relations (Slovak Republic), 2021) Kołtunowicz, T.N.; Gałaszkiewicz, P.; Kierczyński, K.; Rogalsk, P.; Okal, P.; Погребняк, Олександр Дмитрович; Погребняк, Александр Дмитриевич; Pohrebniak, Oleksandr Dmytrovych; Буранич, Володимир Володимирович; Буранич, Владимир Владимирович; Buranych, Volodymyr Volodymyrovych; Погорєлов, Максим Володимирович; Погорелов, Максим Владимирович; Pohorielov, Maksym Volodymyrovych; Дєдкова, Катерина Андріївна; Дедкова, Екатерина Андреевна; Diedkova, Kateryna Andriivna; Zahorodna, V.; Balitskyi, V.; Serhiienko, V.; Baginskyi, I.; Gogotsi, O.The paper examined Ti3C2Tx MXene (T—OH, Cl or F), which is prepared by etching a layered ternary carbide Ti3AlC2 (312 MAX-phase) precursor and deposited on a polycaprolactone (PCL) electrospun membrane (MXene-PCL nanocomposite). X-ray Diffraction analysis (XRD) and Scanning Electron Microscopy (SEM) indicates that the obtained material is pure Ti3C2 MXene. SEM of the PCL-MXene composite demonstrate random Ti3C2 distribution over the nanoporous membrane. Results of capacitance, inductance, and phase shift angle studies of the MXene-PCL nanocomposite are presented. It was found that the frequency dependence of the capacitance exhibited a clear sharp minima in the frequency range of 50 Hz to over 104 Hz. The frequency dependence of the inductance shows sharp maxima, the position of which exactly coincides with the position of the minima for the capacitance, which indicates the occurrence of parallel resonances. Current conduction occurs by electron tunneling between nanoparticles. In the frequency range from about 104 Hz to about 105 Hz, there is a broad minimum on the inductance relationship. The position of this minimum coincides exactly with the position of the maximum of the phase shift angle—its amplitude is close to 90°. The real value of the inductance of the nanocomposite layer was determined to be about 1 H. It was found that the average value of the distance over which the electron tunnels was determined with some approximation to be about 5.7 nm and the expected value of the relaxation time to be τM ≈ 3 × 10−5 s.Item Multilayer and high-entropy alloy-based protective coatings for solving the issue of critical raw materials in the aerospace industry(IOP Publishing, 2021) Постольний, Богдан Олександрович; Постольный, Богдан Александрович; Postolnyi, Bohdan Oleksandrovych; Буранич, Володимир Володимирович; Буранич, Владимир Владимирович; Buranych, Volodymyr Volodymyrovych; Смирнова, Катерина Василівна; Смирнова, Екатерина Васильевна; Smyrnova, Kateryna Vasylivna; Araujo, J.P.; Rebouta, L.; Погребняк, Олександр Дмитрович; Погребняк, Александр Дмитриевич; Pohrebniak, Oleksandr Dmytrovych; Рогоз, Владислав Миколайович; Рогоз, Владислав Николаевич; Rohoz, Vladyslav MykolaiovychAerospace is an actively developing industry that continuously requires the implementation of modern technologies. The rapid growth in new vehicle production demands much support. Hence, the problem of resources with complicated supply and distribution is always of current interest. These critical raw materials (CRMs) are involved in almost all areas of aerospace manufacturing and service. An efficient and profitable solution to the problem of critical materials can be found in protective coatings, especially in such advanced concepts as multilayer and high-entropy alloy (HEA)-based coatings. In this paper, we study both ways of manufacturing effective coatings. We have shown that multilayer CrN/MoN coatings with exceptional toughness and hardness could find promising applications in the aerospace industry. The developed strategy for the novel materials screening based on the prediction of their properties has been demonstrated on the example of the refractory HEA-based coatings. A brief state of the art of the EU critical raw materials and their place in the aerospace/defence industry has been given.Item Mechanical and tribological characterization of nanostructured HfB2 flms deposited from compound target(Springer Nature, 2020) Буранич, Володимир Володимирович; Буранич, Владимир Владимирович; Buranych, Volodymyr Volodymyrovych; Погребняк, Олександр Дмитрович; Погребняк, Александр Дмитриевич; Pohrebniak, Oleksandr Dmytrovych; Budzynski, P.; Шелест, Ігор Владиславович; Шелест, Игорь Владиславович; Shelest, Ihor Vladyslavovych; Prószyński, A.; Chocyk, D.; Гончаренко, Олексій Сергійович; Гончаренко, Алексей Сергеевич; Honcharenko, Oleksii Serhiiovych; Юнда, Андрій Миколайович; Юнда, Андрей Николаевич; Yunda, Andrii MykolaiovychFabrication and development of HfB2-based nanostructured coatings was investigated. All flms were deposited on stainless-steel substrates by RF magnetron sputtering from stochiometric HfB2 target in argon atmosphere. The aim of this work is to evaluate the efects of the bias potential on the microstructure, mechanical and tribological properties. These parameters strongly depend on the experimental conditions. X-ray difraction analysis indicated the diference in microstructure: from dense hexagonal structure with (0001) preferred orientation of nanocrystallites to quasi-amorphous with blurred HfB2 phase peaks. All coatings were measured using nanoindentation (using Berkovich tip), tribology (ballon-disk) and nano-scratch (friction). Coatings with a thickness of 1–2 µm had a signifcant dependence of properties on the microstructure: hardness drastically increased from 8 to 45 GPa, H/E ratio and elastic recovery changed respectively: 0.04–0.15 and 0.26–0.72.Item Effect of Energy Factors on the Structure and Substructure Characteristics of Hafnium Diboride Films Deposited by RF Magnetron Sputtering(G. V. Kurdyumov Institute for Metal Physics of the N.A.S. of Ukraine, 2020) Гончаров, Максим Миколайович; Гончаров, Максим Николаевич; Honcharov, Maksym Mykolaiovych; Zykov, A.V.; Юнда, Андрій Миколайович; Юнда, Андрей Николаевич; Yunda, Andrii Mykolaiovych; Шелест, Ігор Владиславович; Шелест, Игорь Владиславович; Shelest, Ihor Vladyslavovych; Буранич, Володимир Володимирович; Буранич, Владимир Владимирович; Buranych, Volodymyr VolodymyrovychIn this paper, the influence of energy factors, such as the bias potential, current density, deposition rate, on the formation of the structure and substructure of hafnium diboride films deposited using RF magnetron sputtering is analysed. As shown, the structural changes from a quasi-amorphous to a nanocrystalline state with a growth texture occur due to changes in energy factors.Item The cathodic electrolytic plasma hardening of the 20Cr2Ni4A chromium-nickel steel(Elsevier, 2020) Rakhadilov, B.K.; Буранич, Володимир Володимирович; Буранич, Владимир Владимирович; Buranych, Volodymyr Volodymyrovych; Satbayeva, Z.A.; Sagdoldina, Z.B.; Kozhanova, R.S.; Погребняк, Олександр Дмитрович; Погребняк, Александр Дмитриевич; Pohrebniak, Oleksandr DmytrovychIn order to obtain the modified surface structure of the 20Cr2Ni4A steel plasma electrolytic hardening (PEH) method was used. The surface hardening process was conducted in the aqueous electrolyte solution of 20% sodium carbonate and 20% urea. The sample consists of a ferritic-pearlitic structure, i.e. the part retains its viscous core, and the surface layer contains carbide particles. Hardening process induces martensite transformation and creation of carbide particles in the surface layer. The presence of carbide particles in the surface layers has a positive effect on the tribo-mechanical performance. Hardened structure 600 m long was obtained with hardness increase up to 520 HV and 2.5 times higher wear resistance. Tribological test results showed the difference of the coefficient of friction as a function of surface roughness determined by plasma-electrolytic hardening process.Item Effect of the PEN/C surface layer modification on the microstructure, mechanical and tribological properties of the 30CrMnSiA mild-carbon steel(Elsevier, 2020) Zhurerova, L.G.; Rakhadilov, B.K.; Popova, N.A.; Kylyshkanov, M.K.; Буранич, Володимир Володимирович; Буранич, Владимир Владимирович; Buranych, Volodymyr Volodymyrovych; Погребняк, Олександр Дмитрович; Погребняк, Александр Дмитриевич; Pohrebniak, Oleksandr DmytrovychAs a result of plasma-electrolytic nitrocarburizing 30CrMnSiA carbon steel (ferrite-perlite grade), there was a change in the elemental and phase composition, as well as the surface layer microstructure (40 ÷ 45 microns thick from the surface). A formation of Me23(CN)6 carbonitrides, FeN nitrides, Fe3C - (Fe, Cr)3C carbides and an increase in dislocation density within –phase (tempered martensite crystallites), high-temperature lamellar martensite were observed. As a result of PEN / C exposure for 7min. At 750 ◦C there is a reduction of friction coefficient and wear rate, what is connected with finely dispersed secondary phases FeN, (Fe, Cr)3C, Me23(C, N)6 formation. Thus, there is an 2,5 ÷ 3,3 times increase in hardness of 30CrMnSiA carbon steel samples.Item Аналіз впливу параметрів магнетронного розпилення на формування наноструктурних покриттів TaB2(Сумський державний університет, 2018) Шелест, Ігор Владиславович; Шелест, Игорь Владиславович; Shelest, Ihor Vladyslavovych; Кравченко, Ярослав Олегович; Кравченко, Ярослав Олегович; Kravchenko, Yaroslav Olehovych; Буранич, Володимир Володимирович; Буранич, Владимир Владимирович; Buranych, Volodymyr Volodymyrovych; Бровко, Д.Ю.Тонкі покриття на основі боридів перехідних металів мають високу температуру плавлення та твердість, і знайшли широкий діапазон використання у різних галузях промисловості, за рахунок ефективного підвищення захисних властивостей. Для нанесення даних покриттів високу популярність здобув метод нереактивного магнетронного розпилення композиційних мішеней за участю іонного бомбардування, за рахунок високої варіативності в плані регулювання параметрів.Item Синтез надтвердих плівок дибориду танталу методом магнетронного розпилення на постійному струмі(Сумський державний університет, 2018) Шелест, Ігор Владиславович; Шелест, Игорь Владиславович; Shelest, Ihor Vladyslavovych; Кравченко, Ярослав Олегович; Кравченко, Ярослав Олегович; Kravchenko, Yaroslav Olehovych; Буранич, Володимир Володимирович; Буранич, Владимир Владимирович; Buranych, Volodymyr Volodymyrovych; Єпіфанов, І.Н.Матеріали модифіковані покриттями боридів та боридонітрідів набувають високої міцності і температурної стабільності, добре зарекомендували себе у сфері машинобудування. Надтвердість у даних плівках обумовлюється особливим наноструктурних станом з переважною орієнтацією зростання зерен по відношенню до кристалографічної площини.Для отримання покриттів диборида танталу використовували DC-магнетронну систему для реактивного синтезу з композиційних мішеней.