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Item Superhardness Effect in TransitionMetal Diborides Films(Pleiades Publishing, Ltd, 2016) Bazhin, A.I.; Goncharov, A.A.; Stupak, V.A.; Погребняк, Олександр Дмитрович; Погребняк, Александр Дмитриевич; Pohrebniak, Oleksandr Dmytrovych; Гончарова, Світлана Анатоліївна; Гончарова, Светлана Анатольевна; Honcharova, Svitlana AnatoliivnaThe structure, composition, and properties of transitionmetal diboride films have been studied. It was shown that they are characterized by a wide range of structural states, namely from amorphouslike to nanocrystalline with crystallite sizes of 1–50 nm. The characteristic peculiarity of the structure of film transitionmetal diborides with high physical and mechanical properties is the formation of a nanocrystalline (columnar) structure with the growth texture in plane [00.1] and a nanocrystallite size of 20–50 nm. The element composition of a superhard highly textured film transitionmetal diborides was studied by ion mass spectrometry and Auger electron spectroscopy. The overstoichiometry effect in nanocrystalline transition metal diboride films is explained. It was shown that this effect is related to the formation of an additional B⎯B covalent bond, which is realized at subgrain boundaries and leads to the appearance of superhardness in the formed coatings. KeywoItem Research of Thermal Stability of Tapes of Diboride of Hafnium and Receipt of Optimization Model of Cutting Process(Sumy State University, 2014) Agulov, A.V.; Vasileva, L.V.; Goncharov, A.A.; Stupak, V.A.; Petukhov, V.V.The short analysis of thermal stability and features of structure and physical-mechanical descriptions of thin wearproof coverages is executed on the basis of diborides of transitional metals, under act of high temperatures. The optimization model of cutting process is presented by the hard-alloy plate of Т15К6 with nanocrystalline tape of diboride of hafnium, by possessing the best physical-mechanical descriptions nanohardness of Н = 44,5 GPa and module of resiliency of Е = 396 GPa.Item Thermal Stability of Hafnium Diboride Films, Obtained on Substrates of Steel 12X18H9T and Cutting Plate T15K6(Sumy State University, 2012) Agulov, A.V.; Goncharov, A.A.; Goncharova, S.A.; Bazhin, A.I.; Stupak, V.A.; Petukhov, V.V.Investigation results of the influence of high-temperature annealing in the air environment on the phase structure and structure of hafnium diboride films, received on substrates from steel 12Х18Н9Т and cutting plate Т15К6 are presented. It is shown that in the course of annealing on a surface of HfВ2 film the oxide layer of HfО2, with monoclinic structure is formed. Thus, annealing temperature increase from 600 to 1000 С leads to increase in thickness of an oxide layer from 100 to 600 nanometers and to formation of a multilayered covering of HfB2 - HfO2. On substrates of steel 12Х18Н9Т the coating is destructed at the temperature higher on 800 C than for Т15К6. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/34923Item Superhardness Effect of the Films of Transition Metals Diborides(Sumy State University, 2012) Goncharov, A.A.In this work the data of superhardness effect of thin film coatings based on diborides transition metals are presented. The results of substructural characteristics of the synthesized films are discussed. The structure, physicomechanical characteristics of the films are investigated. The formation mechanism sp2 and sp3 chemical bonds are described. The measurements of the hardness and the elasticity module of the coating are conducted. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/34906Item Thermal stability of film nanostructure of high-melting compounds(Видавництво СумДУ, 2011) Agulov, A.V.; Turchenko, V.A.; Goncharova, S.A.; Kudelin, U.V.; Goncharov, A.A.; Bazhin, A.I.; Stupak, V.A.Item Structural features of forming of films of diborides of transitional metals(Видавництво СумДУ, 2011) Goncharov, A.A.