Факультет робототехніки та штучного інтелекту
Постійне посилання на фондhttps://repository.lntu.edu.ua/handle/123456789/3434
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Item type:Наукова стаття, Numerical Evaluation of the Properties of Highly Efficient Titanium Porous Materials(Cham: Springer Nature Switzerland, 2023-08-21) Povstyanoy, Oleksandr; Imbirovich, Nataliya; Redko, Rostyslav; Redko, Olha; Savaryn, PavloAn exciting combination of such properties as high strength, low den- AQ1 sity, corrosion resistance, and biocompatibility characterizes titanium. However, the widespread use of titanium at the industrial level has not yet been achieved due to its high extraction and production costs. Therefore, titanium is increasingly used in sectors with high demand, such as the aerospace industry or the production of biomedical devices, where the final high cost is not a major factor. It is believed that processing titanium and its alloys using powder metallurgy (PM) methods is a significant way to reduce the cost of manufacturing titanium products. It also provides the opportunity to develop new alloys that are difficult to obtain using traditional technologies. This work is devoted to processing titanium powder from biomedical production waste using various PM methods. It aims to research the processing of almost pure, chemically homogeneous, and finegrained titanium-based components. In particular, the main properties that can be achieved (porosity, microstructure, and mechanical properties) and the creation of highly efficient porous materials by advanced methods of isostatic pressing are presented.Item type:Наукова стаття, Anti-friction Products from Composite Materials Based on Lh15 Steel Powder(2024-07-06) Povstyanoy, Oleksandr; Halchuk, Tetiana; Polinkevych, Romаn; Redko, OlhaThe work considers the possibility of manufacturing and using sintered composite products from a metal component in the form of alloy steel powder ob-tained from grinding waste of bearing production. The research was carried out at op-timal pressing parameters of 400...800 MPa, sintering at 1200°C for 2 hours from the moment of setting the specified temperature. The results of the first systematic studies of the strength and tribotechnical properties of sintered materials based on LH15 steel powder obtained from grinding slurries with copper and graphite additives are pre-sented. It was established that the tribotechnical characteristics of sintered products under conditions of medium loads mainly depend on the hardness of the composition. It has been experimentally verified that the high wear resistance and friction coefficient, which is on average 0.09, has a composition with a content of 2% graphite and 4% copper at a sliding speed of 5 m/s and a pressure of 10 MPa. It has been experimental-ly confirmed that the increase in the linear dependence of stress on deformation, in particular, when the strain is 8%, the stress is 1200...1400 MPa. This makes it possible to predict higher operational properties of products made from material of this com-position. The resulting anti-friction products have a significantly lower cost and a higher material utilization ratio compared to traditional materials.