Факультет електроніки та інформаційних технологій (ЕлІТ)
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Item Peculiarities of Magnetoresistive Properties of (Fe[80]Co[20])[x]Cu[1−x] Film Alloy Prepared by Layer-by-Layer Condensation with Post-Annealing(Institute of Physics Polish Academy of Sciences, 2022) Пазуха, Ірина Михайлівна; Пазуха, Ирина Михайловна; Pazukha, Iryna Mykhailivna; Saltykov, D.I.; Шкурдода, Юрій Олексійович; Шкурдода, Юрий Алексеевич; Shkurdoda, Yurii OleksiiovychThe work is devoted to the results of investigations of magnetoresistive properties of (Fe80Co20)xCu1−x film alloy prepared by layer-by-layer condensation with post-annealing at the temperature of 550 K. The total thickness of the samples ranged from 20 to 50 nm. It has been demonstrated that the samples are homogeneous in thickness. At the concentration of Cu atoms of 50 at.%, as a result of spin-dependent electron scattering, the isotropic nature of magnetoresistance with the value of 0.5–1% is observed. It confirms the efficiency of the proposed method for the preparation of granular film with giant magnetoresistance. The annealing of film alloys at the temperature of 700 K does not change the nature of magnetoresistance. At the concentration of Cu atoms of less than 50 at.%, the anisotropic magnetoresistance is fixed only.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 Effect of thermal annealing and deposition conditions on the structure and mechanical properties of a mulitlayer nitride coating based on Ta(Begell House Inc., 2016) Kravchenko, Ya.; Maksakova, O.; Drodziel, P.; Loboda, V.An analysis of the structure and mechanical properties of multilayer nitride coatings based on Ta depending on the deposition conditions and thermal vacuum-free annealing was conducted. Ta/TaN is a multylayer structure with alternate deposition of a polycrystalline layer of Ta of high ductility and a layer of TaN of high strength. TaN is a coating deposited by magnetron sputtering with the ratio N2/Ar = 0.4, exhibiting a high degree of crystallinity that leads to a high adhesive strength and hardness of Ta/TaN multilayer coatings. For nitride coatings based on refractory elements of the V–VI period, the general patterns consisting in the formation of the NaCl structure, and the predominant orientation of the planes (111) were identified. The application of heat treatment decreases the microhardness of the Ta/TaN multilayer coatings from 2600 to 1200 kgf/mm2, and leads to deterioration of the adhesive strength between the layers. In the process of mechanical testing, the tribological coefficient for the considered protective coatings was 0.1–0.25, the volume of surface wear was 14.3 mm3Item Structural features and physico-mechanical properties of AlN-TiB2-TiSi2 amorphous-like coatings(Allerton Press, Inc, 2015) Погребняк, Олександр Дмитрович; Погребняк, Александр Дмитриевич; Pohrebniak, Oleksandr Dmytrovych; Demianenko, A. A.; Pshik, A. V.; Kravchenko, Yu. A.; Sobol, O. V.; Beresnev, V. M.; Amekura, H.; Kono, K.; Oyoshi, K.; Takeda, Y.; Podchernyaeva, I. A.The coating of the AlN–TiB2–TiSi2 system has been produced by the magnetron sputtering of a target. At the hightemperature (900 and 1300°C) actions the coating crystallization to form crystallites of sizes 11–25 nm has been observed. It has been defined that the amorphouslike structure is promising for the use of these coatings as diffusion barriers both as the independent elements and a contacting layer in multilayer wearresistant coatings. It has been shown that the use of the resultant composite as an effec tive protective coating for cutting tools will make it possible to increase the tools wear resistance by more than 30% at the temperature up to 1300°C in the cutting zone.Item High Temperature Annealing of Ion-Plasma Nanostructured Coatings Based on AlN-TiB2(TiSi2)(Polish Academy of Sciences Institute of Physics, 2014) Погребняк, Олександр Дмитрович; Погребняк, Александр Дмитриевич; Pohrebniak, Oleksandr Dmytrovych; Бондар, Олександр В`ячеславович; Бондарь, Александр Вячеславович; Bondar, Oleksandr Viacheslavovych; Beresnev, V.M.; Abadias, G.; Sobol, O.V.; Pshyk, A.V.; Kolesnikov, D.A.; Belovol, K.O.; Demianenko, A.A.; Komsta, H.The coatings investigated in this paper were deposited via the magnetron sputtering of AlN-TiB2(TiSi2) target in Ar atmosphere. The investigation of structural-phase composition, element composition, morphology and mechanical properties before and after annealing up to 1350 C was carried out. The concentration of elements in the coating was changed after annealing at 900 C and further annealing at 1350 C (especially after annealing at 1350 C). The hardness of as-deposited coatings was 15 GPa, but after annealing at 1350 C the value of hardness increased up to 22 - 23,5 GPa. The value of the viscoplastic index was 0.07. All this provide high damping properties of the coating, and amorphous-like structure makes promising the use of these coatings as diffusion barriers in the form of independent elements, and as a contacting layer in multilayer wear resistant coatings.Item 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/123456789/33937