Eastern-European Journal of Enterprise Technologies https://journals.uran.ua/eejet <p><span lang="EN-US">Terminology used in the title of the «Eastern-European Journal of Enterprise Technologies» - «enterprise technologies» should be read as «industrial technologies». <strong>«Eastern-European Journal of Enterprise Technologies»</strong> publishes all those best ideas from the science, which can be introduced in the industry. Since, obtaining the high-quality, competitive industrial products is based on introducing high technologies from various independent spheres of scientific researches, but united by a common end result - a finished high-technology product. </span>Among these scientific spheres, there are information technologies and control systems, engineering, energy and energy saving. Publishing scientific papers in these directions are the main development «vectors» of the «Eastern-European Journal of Enterprise Technologies». Since, these are those directions of scientific researches, the results of which can be directly used in modern industrial production: space and aircraft industry, instrument-making industry, mechanical engineering, power engineering, chemical industry and metallurgy.</p> <p><span lang="EN-US">Therefore, the scientists, associated with modern production, have the opportunity to participate in <strong>technology transfer to industry</strong>, publishing the results of their applied scientific researches. Industrialists, in turn, can draw scientific and practical information from the journal - each in their direction:</span></p> <ul> <li>specialists in management and computer science - from volumes «Applied Information Technologies and Control Systems», «Mathematics and Cybernetics - Applied Aspects»;</li> <li>mechanical and design engineers - from the volume «Applied Mechanics»;</li> <li>production engineers - from volumes «Mechanical Engineering Technology», «Applied Physics», «Materials Science», «Technology of organic and inorganic substances and the Ecology»;</li> <li>production and power engineers - from the volume «Energy-saving technology and equipment».</li> </ul> <p><span lang="EN-US"><strong>The goal of the journal</strong> is to eliminate the gap, which occurs between the rapidly emerging new scientific knowledge and their introduction in the industry, which requires much more time. Industrial enterprises are active subscribers to the «Eastern-European Journal of Enterprise Technologies», and production engineers check the practical value of those scientific and technological ideas, which are recommended for implementation by scientists-authors of the ''Eastern-European Journal of Enterprise Technologies».</span></p> <p><span lang="EN-US"><strong>The objective of the journal</strong> in achieving the goal is <strong>forming a «scientific component» of modern technologies transfer</strong> from science to industry. Therefore, in the papers, published in the journal, the emphasis is placed on both scientific novelty, and practical value.</span></p> en-US <p>The consolidation and conditions for the transfer of copyright (identification of authorship) is carried out in the License Agreement. In particular, the authors reserve the right to the authorship of their manuscript and transfer the first publication of this work to the journal under the terms of the Creative Commons CC BY license. At the same time, they have the right to conclude on their own additional agreements concerning the non-exclusive distribution of the work in the form in which it was published by this journal, but provided that the link to the first publication of the article in this journal is preserved.</p> <p>A license agreement is a document in which the author warrants that he/she owns all copyright for the work (manuscript, article, etc.).<br />The authors, signing the License Agreement with TECHNOLOGY CENTER PC, have all rights to the further use of their work, provided that they link to our edition in which the work was published.<br />According to the terms of the License Agreement, the Publisher TECHNOLOGY CENTER PC does not take away your copyrights and receives permission from the authors to use and dissemination of the publication through the world's scientific resources (own electronic resources, scientometric databases, repositories, libraries, etc.).<br />In the absence of a signed License Agreement or in the absence of this agreement of identifiers allowing to identify the identity of the author, the editors have no right to work with the manuscript.<br />It is important to remember that there is another type of agreement between authors and publishers – when copyright is transferred from the authors to the publisher. In this case, the authors lose ownership of their work and may not use it in any way.</p> eejet@entc.com.ua (Frolova Liliia) eejet@entc.com.ua (Frolova Liliia) Fri, 28 Jun 2024 00:00:00 +0300 OJS http://blogs.law.harvard.edu/tech/rss 60 Revealing patterns of change in the tribological efficiency of composite materials for machine parts based on phenylone and polyamide reinforced with arimide-t and fullerene https://journals.uran.ua/eejet/article/view/304719 <p>The object of the study is the process of changing tribological efficiency according to tribotechnical characteristics (wear intensity, friction coefficient, temperature in the contact zone) of composites based on phenylone C-1 and polyamide PA-6 with arimide-T filler and fullerene C-60. The study solved the problem of obtaining composites with high wear resistance.</p> <p>Based on the results of research, it was found that varying the content of arimide-T makes it possible to obtain composites with different patterns of changes in tribotechnical characteristics under conditions of dry friction, lubrication with water and I-50 oil. Composites with the composition: phenylone C-1+15 wt. have the maximum tribological efficiency. % arimide-T+3 wt. % fullerene C-60 and polyamide PA-6+30 wt. % arimide-T+3 wt. % fullerene C-60.</p> <p>Phenylone C-1 has destructive properties when working in the environment of water and temperature in the friction zone. Its reinforcement with arimide-T and fullerene C60 gave positive results of a complex of tribotechnical characteristics under these conditions. It was found that the wear of composites based on phenylone C-1 in I-50 oil is two orders of magnitude lower than in water. Research of samples from the obtained composites based on phenylone C-1 and polyamide PA-6, reinforced with the optimal content of arimide-T and fullerene C60, showed that their wear resistance when lubricated with oil is 3.5...4.0 times greater than the wear resistance of bronze.</p> <p>An applied aspect of the reported results is the introduction of manufacturing technologies and restoration of machine parts from the proposed composites. It has been proven that their optimal composition contributes to high tribological efficiency and could provide the required level of wear resistance and reliability of resource-determining nodes, systems, and machine assemblies.</p> <p>The results could be used by machine-building and repair-technological enterprises</p> Viktor Aulin, Ivan Rogovskii, Oleh Lyashuk, Andrii Tykhyi, Alexander Kuzyk, Andrii Dvornyk, Oleksiy Derkach, Serhii Lysenko, Oleksandr Banniy, Andrii Hrynkiv Copyright (c) 2024 Viktor Aulin, Ivan Rogovskii, Oleh Lyashuk, Andrii Tykhyi, Alexander Kuzyk, Andrii Dvornyk, Oleksiy Derkach, Serhii Lysenko, Oleksandr Banniy, Andrii Hrynkiv http://creativecommons.org/licenses/by/4.0 https://journals.uran.ua/eejet/article/view/304719 Fri, 28 Jun 2024 00:00:00 +0300 Designing tribotechnical epoxy composite materials reinforced with chopped fibers and modified with silicon organic varnish https://journals.uran.ua/eejet/article/view/305739 <p>The object of research is modified epoxy composite materials containing fibrous fillers treated in physical fields. The technological features of the development of tribotechnical epoxy composites, which must withstand the effects of elevated temperatures, have been considered. In this case, it is necessary to modify the structure of the epoxy polymer matrix, which is achieved as a result of the introduction of heat-resistant organosilicon varnish. Organosilicon varnishes and chopped fibers contain technological additives, which complicates the process of structuring epoxy composites and leads to the appearance of structural defects. Removal of technological additives and cleaning the surface of the aramid and glass fibers from lubricants is possible as a result of processing the components of the composition in physical fields. There is a need to study the influence of physical fields on the structuring processes of the epoxy system and the formation of the structure of epoxy composites with specified properties. Modified epoxy composites contain chopped aramid and glass fibers treated with ultrasound. The tribotechnical characteristics of epoxy composites were studied at a sliding speed of V=1.0 m/s with a change in specific load from 0.5 MPa to 1.5 MPa. The temperature in the tribocontact zone during frictional interaction rises to 100 °C with an increase in the specific load. An increase in the density of the surface layer of tribocontact of epoxy composites with fillers treated in physical fields was revealed. The practical recommendations have been compiled for the implementation of the treatment technology of components in physical fields, which ensures structuring of epoxy composites with high tribotechnical characteristics</p> Vitalii Kashytskyi, Oksana Sadova, Valentyna Tkachuk, Oleg Shehynskyi, Inna Parfentyeva Copyright (c) 2024 Vitalii Kashytskyi, Oksana Sadova, Valentyna Tkachuk, Oleg Shehynskyi, Inna Parfentyeva http://creativecommons.org/licenses/by/4.0 https://journals.uran.ua/eejet/article/view/305739 Fri, 28 Jun 2024 00:00:00 +0300 Determining patterns of leaching titanium(IV) from the Irshansky deposit ilmenite https://journals.uran.ua/eejet/article/view/304661 <p>The research object is the ilmenite concentrate from the Irshansky deposit. This study describes an elemental composition of the mineral raw material and confirms its structure using the X-ray diffraction and scanning electron microscopy. Experimental studies have shown that the ilmenite concentrate from the Irshansky deposit has a significant titanium content in terms of titanium dioxide (79 %). Mineral raw materials with such a chemical composition are unique, so there is a need to find alternative methods for its processing. The research demonstrates that the maximum degree of extraction in the process of alkaline leaching of the ilmenite concentrate is achieved under the condition that the average diameter of particles of the mineral raw material should be ≤71 μm. As a result of temperature studies, it has been found that a temperature of 453 K would suffice to obtain potassium titanate at atmospheric pressure. Further temperature increase does not provide for a significant increase in the degree of titanium extraction, and also contributes to the formation of polytitanates of various compositions. The study of the influence of the molar ratio of the starting reagents on the degree of extraction of titanium(IV) from the ilmenite concentrate has showed that the optimal molar ratio between the components corresponds to the stoichiometric one and is 1:2. Increasing the amount of potassium hydroxide in the reaction mixture is impractical as it reduces the yield of potassium titanate, and the final product will have high alkalinity due to excess alkali. The optimal time for alkaline leaching is three hours of continuous heating in a glycerin bath. A further increase in the duration of heating does not lead to an increase in the degree of extraction, which is associated with the diffusion of alkali from the surface of the nucleus into the volume of ilmenite particles due to the formed products of interaction and annihilation of the initial nuclei</p> Snizhana Pysarenko, Oleksandr Kaminskyi, Roman Denysiuk, Olena Yevdochenko, Olena Chyhyrynets, Olena Anichkina, Olga Avdieieva, Yuliia Lysetska Copyright (c) 2024 Snizhana Pysarenko, Oleksandr Kaminskyi, Roman Denysiuk, Olena Yevdochenko, Olena Chyhyrynets, Olena Anichkina, Olga Avdieieva, Yuliia Lysetska http://creativecommons.org/licenses/by/4.0 https://journals.uran.ua/eejet/article/view/304661 Fri, 28 Jun 2024 00:00:00 +0300 Determining technological parameters for obtaining ta15 titanium alloy blanks with improved mechanical characteristics using the electron-beam 3D printing method https://journals.uran.ua/eejet/article/view/306613 <p>The object of this study is the process of electron beam 3D printing of articles made of TA15 titanium alloy powder. Peculiarities of the structure and properties formation of alloy blanks, obtained by this method have been described. Influence of process parameters (electron beam power and geometric scanning parameters) on the characteristics of the material were considered.</p> <p>Step of displacement of the beam trajectory changed from 0.1 to 0.25 mm with an interval of 0.05 mm. Specific energy of the electron beam varied from 20 to 70 J/mm<sup>3</sup> for every trajectory displacement step.</p> <p>The macrostructure was examined visually while the microstructure was studied by optical microscopy. Mechanical properties were determined by uniaxial tension and impact bending tests. It was established that depending on the 3D printing parameters the macrostructure of most samples is dense but with unfavorable parameters non-fusions or shrinkage porosity defects may form. The microstructure of the dendritic type has an α´+β lamellar-acicular morphology, its dispersity and shape of α´–phase areas vary depending on the process parameters.</p> <p>A scanning step of 0.2 mm and a beam energy of 40 J/mm<sup>3</sup> allows obtaining a dispersed microstructure in which there are no non-fusions and shrinkage micropores. The value of the R<sub>m</sub> is 27 %, and the R<sub>0.2</sub> is 24 % higher than that of the alloy obtained by the conventional technology of electron beam melting. The A<sub>5</sub> is 3.2 times higher. However, impact toughness of the sample with dendrite unfavorable orientation to the direction of load applying may be lower compared to conventional technology. The results could be used for devising commercial technology of high strength titanium alloys parts produced by 3D printing</p> Serhii Akhonin, Vladimir Nesterenkov, Volodymyr Pashynskyi, Vladyslav Matviichuk, Sviatoslav Motrunich, Volodymyr Berezos, Illia Klochkov Copyright (c) 2024 Serhii Akhonin, Vladimir Nesterenkov, Volodymyr Pashynskyi, Vladyslav Matviichuk, Sviatoslav Motrunich, Volodymyr Berezos, Illia Klochkov http://creativecommons.org/licenses/by/4.0 https://journals.uran.ua/eejet/article/view/306613 Fri, 28 Jun 2024 00:00:00 +0300 Enhancing side die resistance to thermal shock in automotive casting: a comparative study of FCD550 and SKD6 materials https://journals.uran.ua/eejet/article/view/306615 <p>Enhancement of side die resistance to thermal shock in mold disc car applications was achieved by substituting FCD550 material with SKD6 material. The primary issue addressed is the cracking of side dies due to thermal shock induced by an accelerated production process, leading to production halts and failure to meet large customer orders. The study aims to identify a material that can better withstand thermal shock than FCD550, thereby improving the durability of side dies and the overall productivity of the manufacturing process. The research involved direct production experiments, analyzing the materials FCD550 and SKD6, evaluating die characteristics, and assessing finished product attributes before and after material changes. Laboratory tests and machine-setting trials were conducted, varying production processes and assessing the results. The findings indicate that SKD6 is significantly more resistant to thermal shock than FCD550 in mold disc car applications. The study compared the strength of side die materials using data sheets and adjusted setting parameters under existing cooling conditions. Experimentation involved altering the standard temperature from 520 °C–545 °C to 532 °C–538 °C and reducing the soaking time from a minimum of 270–540 seconds to 332 seconds. This reduced soaking time from 69 seconds to 46 seconds and aging time from 190 seconds to 180 seconds, increasing casting productivity from 194,870 pieces/28 days to 213,311 pieces/28 days across seven machines, thereby fulfilling the customer’s requirement of 200,000 pieces/28 days without side die cracks. Durability testing on five product samples according to TSD5605G standards confirmed the quality as meeting customer specifications</p> Herry Patria, Iwan Susanto, Belyamin Belyamin, Dianta Mustofa Kamal Copyright (c) 2024 Herry Patria, Iwan Susanto, Belyamin Belyamin, Dianta Mustofa Kamal http://creativecommons.org/licenses/by/4.0 https://journals.uran.ua/eejet/article/view/306615 Fri, 28 Jun 2024 00:00:00 +0300 Synthesis of NiCrAlY nano-scale powder by high-energy ball milling process for thermal spray coating application https://journals.uran.ua/eejet/article/view/307040 <p>These days, during the issues of climate change, there has been a shift in the energy industry from using fossil fuels to more environmentally friendly fuels such as biomass fuels. Biomass fuel is considered CO<sub>2</sub> neutral because the carbon produced during combustion in the form of CO<sub>2</sub> emissions can be used for new plant growth. However, besides the advantages of using biomass fuel, a problem arises when biomass fuel contains a high concentration of corrosive agents, which can be released along with hot fuel gas. These corrosive agents can damage the boiler components. Coating technology is one of the solutions to protect components that work at high temperatures against the corrosion threat. One type of coating that can be used in high-temperature applications is NiCrAlY coating by the high-velocity oxide (HVOF) process. One interesting topic that people are developing is using nano-scale coating to increase the coating’s resistance against hot corrosion and cracking. Nano-scale powder feedstock is needed to produce nano-scale coating material. In this research, top-down method is used to synthesis nano-scale powder. One of top down method, the high-energy ball milling processs, is a promising method to synthesize nano-scale powder material. Therefore, in this research, the ball milling process is used to prepare nano-scale product. The results showed that this method was successful to make the nano-scale powder. The nano-scale powder was characterized by several methods to investigate the morphology and properties of the powders. However, there are still many challenges in producing nano-scale powder that meets HVOF feedstock powder requirements. In the long run, it is expected that this research can answer those challenges so that at the end, the good quality of nano-scale powder can be achieved</p> Irma Pratiwi, Husaini Ardy, Budi Prawara, Raden Dadan Ramdan, Fahdzi Muttaqien Copyright (c) 2024 Irma Pratiwi, Husaini Ardy, Budi Prawara, Raden Dadan Ramdan, Fahdzi Muttaqien http://creativecommons.org/licenses/by/4.0 https://journals.uran.ua/eejet/article/view/307040 Fri, 28 Jun 2024 00:00:00 +0300 Establishing patterns in the structure formation of polymer nanocomposites based on polyamide 6 during their crystallization processes https://journals.uran.ua/eejet/article/view/306965 <p>This paper reports experimental and computational studies on patterns in the structure formation of polymer nanocomposites when different types of fillers are used. The study was conducted for nanocomposites based on polyamide 6 filled with carbon nanotubes or silicon dioxide nanoparticles. In the course of research, the mass fraction of the filler varied from 0.2 % to 4.0 %, and the cooling rate of the melt composite varied from 0.5 K/min up to 20 K/min.</p> <p>Data on experimental and theoretical studies into the mechanisms of structure formation of composites according to the method, which includes two stages, are given. According to the first stage, crystallization exotherms of nanocomposites were experimentally obtained when they are cooled from the melt at a given constant rate. The dependence of various characteristics of the crystallization process on the mass fraction of the filler and the cooling rate of the composite was established.</p> <p>At the second stage, based on the analysis of the obtained crystallization exotherms, theoretical studies were performed to determine the mechanisms of structure formation of nanocomposites at different stages of crystallization. For the initial stage, according to the nucleation equation, the presence of two mechanisms of structure formation – planar and volumetric – has been shown.</p> <p>Within the framework of the Kolmogorov-Avrami equation, the mechanisms of structure formation at the next stage of crystallization were established, which corresponds to the formation of ordered structures in the material within the volume of the polymer composite as a whole. The research was carried out assuming the existence of a mechanism of crystallization of the polymer matrix itself, which is realized on fluctuations in the density of the polymer, and a mechanism of crystallization, the centers of which are filler particles.</p> <p>The use of the proposed nanocomposites is promising for the manufacture of parts of energy equipment, electronic equipment, elements of chemical, processing, defense industry installations, etc.</p> Nataliia Fialko, Nataliia Meranova, Julii Sherenkovskii, Raisa Navrodska, Vitalii Babak, Volodymyr Korzhyk, Maxim Lazarenko, Neli Koseva, Oksana Konoreva, Roman Dinzhos Copyright (c) 2024 Nataliia Fialko, Nataliia Meranova, Julii Sherenkovskii, Raisa Navrodska, Vitalii Babak, Volodymyr Korzhyk, Maxim Lazarenko, Neli Koseva, Oksana Konoreva, Roman Dinzhos http://creativecommons.org/licenses/by/4.0 https://journals.uran.ua/eejet/article/view/306965 Fri, 28 Jun 2024 00:00:00 +0300