Browsing by Author "Zaichuk, Oleksandr V."

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    Carbon Plastics for Reusable Hypersonic Flight Vehicles
    (Ukrainian State University of Chemical Technology, Dnipro, 2024) Kazakevich, M.; Husarova, I.; Kazakevich, V.; Manko, T.; Khoroshylov, V.; Kozis, K.; Osinovyy, G.; Sukha, Iryna V.; Zaichuk, Oleksandr V.
    ENG: The development of hypersonic unmanned aerial vehicles (UAVs) for aerospace systems presents ambitious challenges for scientists and engineers. Extreme flight conditions, such as ultra-high speeds and significant aerodynamic heating, necessitate the creation of new materials capable of withstanding such loads. One of the most promising materials for constructing hypersonic UAVs is carbon fiber-reinforced polymer based on bisphenol nitrile. This material exhibits high thermal resistance, chemical stability, and excellent mechanical properties. Utilizing bisphenol nitrile combined with carbon fibers has enabled the production of composite materials that can operate at temperatures exceeding 300 оC, far surpassing the capabilities of traditional polymer matrices. To assess the suitability of the developed carbon fiber-reinforced plastic for hypersonic UAV applications, comprehensive studies of its physical, mechanical, and thermal characteristics were conducted across a wide temperature range from 20 to 300 оC. The obtained results provided a detailed characterization of the composite and allowed for comparisons with other high-temperature composite materials. The developed carbon fibre-reinforced plastic based on bisphenol nitrile binder shows great promise for constructing hypersonic UAVs. Its high thermal resistance, combined with excellent mechanical properties, makes it suitable for use in the extreme temperature conditions typical of hypersonic flight.
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    Fusible Glass-Crystalline Binder in the Spodumene–Manganese Cordierite System
    (Ukrainian State University of Chemical Technology, Dnipro, 2024) Polozhaj, S. G.; Zaichuk, Oleksandr V.; Polozhaj, A. G.
    ENG: Low-melting glass-crystalline materials with a low temperature coefficient of linear expansion (TCLE) are widely used in various engineering fields. These materials are utilized for joints, protective coatings, additives in sintering of ceramic materials, including as matrices for high-strength dispersion-reinforced materials based on oxygen-free silicon compounds. This paper presents the results of a study on glass-crystalline materials in the pseudo-binary spodumene–manganese cordierite system. Based on experimental data, a fusibility diagram was constructed. Crystalline phases formed during the cooling of the glass melts were identified using X-ray phase analysis and their crystallization tendency was evaluated. It was found that the crystallization ability of the glasses decreases with an increasing content of manganese cordierite. The most promising, low-melting glass composition was identified, with a LiAlSi2O6:Mg2Al4Si5O18 ratio of 30:70 wt.%. The glass formation temperature for this compostion lies in the range of 1200–1250 oC, and the practical melting temperature is 1450 oC. The synthesized glass exhibits softening and intensive crystallization onset temperatures of 760 oC and 960 oC, respectively. The TCLE of the glass is 34.9⋅10–7 oC–1. The primary crystalline phase, β-spodumene, forms bundles of needle-like crystals 10–15 μm in length within the residual glass phase, reducing the material’s TCLE to 20.9⋅10–7 oC–1. The developed material shows potential as a glass-crystalline binder for producing high-strength ceramic materials (wear-resistant and impact-resistant) based on SiC and Si3N4 with reduced sintering temperatures.
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    Glass-Ceramic Binder of Cordierite Composition for Low-Temperature Sintering of High-Strength Ceramic Materials Based on Oxygen-Free Silicon Compounds
    (Ukrainian State University of Chemical Technology, Dnipro, 2024) Polozhaj, S. G.; Zaichuk, Oleksandr V.; Polozhaj, A. G.; Amelina, O. A.; Rudnieva, L. L.
    ENG: The mechanical properties of composite ceramic materials obtained based on oxygenfree silicon compounds are largely determined by the properties of the glass binder. This paper presents the results of studies aimed at determining the most fusible glass in the pseudo-binary system 2MgO⋅2Al2O3⋅5SiO2–2MnO⋅2Al2O3⋅5SiO2 with a high tendency to crystallize as a glass-ceramic binder for low-temperature sintering of high-strength ceramic materials based on oxygen-free silicon compounds. The crystallization tendency of the experimental melts decreases with an increase in in the content of manganese cordierite, as confirmed by X-ray and infrared spectroscopic studies. Based on experimental studies, a melting diagram was constructed, which was used to determine the ratio between magnesium cordierite and manganese cordierite (50:50 wt.%), ensuring a minimum melt temperature of 1275 oC. The melting point of the glass of the specified composition is 1450 oC. The synthesized glass is characterized by a softening point of 800 oC and crystallizes intensively at 1030 oC. The thermal coefficient of linear expansion of the crystallized glass samples is 20.8⋅10–7 oC –1. X-ray diffraction and electron microscopic studies have shown that the developed glass is almost completely crystallized during heat treatment for 2 hours, forming a cordierite solid solution 2(Mg,Mn)O⋅2Al2O3⋅5SiO2. The size of the cordierite phase crystals ranges from 0.5 to 3.0 µm. Due to its fusibility and high crystallization tendency, the developed glass, can be proposed as a promising glassceramic binder for the production of high-strength ceramic materials (wear and impact resistant) based on SiC and Si3N4 with reduced sintering temperatures.
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    Production of Fiberglass Plastics Using Infrared Heating
    (Український державний хіміко-технологічний університет, Дніпро, 2025) Manko, T.; Husarova, I.; Kozis, K.; Sukha, Iryna V.; Zaichuk, Oleksandr V.; Sukhyy, Kostyantyn M.
    ENG: This study analyzes the technology for creating polymer composite materials reinforced with glass fiber. Particular attention is given to their applications in the aerospace industry, where stringent requirements for strength, corrosion resistance, and specific strength render these materials indispensable. The main components of composite materials and their properties are examined. Phenol-formaldehyde resins, widely utilized as a matrix for fiberglass plastics in rocket and space engineering, are studied in detail. The thermomechanical resistance of composites, a critical factor determining their performance under extreme conditions, is highlighted. A significant part of the study focuses on the production and curing processes of composite materials. Various curing methods are analyzed, with a focus on the effectiveness of infrared radiation. The findings establish that infrared heating significantly enhances the physical and mechanical properties of composites while reducing production time.
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    Properties and Structural Characteristics of Glasses in the SrO–BaO–Al2O3–B2O3–SiO2 System for Dielectric Composite Materials
    (Ukrainian State University of Chemical Technology, Dnipro, 2024) Amelina, O. A.; Zaichuk, Oleksandr V.; Hordeieiv, Y. S.; Filonenko, D. V.; Kalishenko, Y. R.
    ENG: Ceramic materials synthesized within alkali-free aluminosilicate systems are widely used as dielectrics in microelectronics, radio engineering, aviation, and rocket technologies. The addition of glass binders to these ceramic compositions significantly reduces the sintering temperature by promoting liquid phase formation at lower temperatures. This study investigates the effect of substituting SrO with BaO on the properties and structural characteristics of glasses in the SrO–BaO–Al2O3–B2O3–SiO2 system. It is found that replacing up to 20 mol.% of SrO with BaO enhances the glass-forming ability and promotes the formation of monoclinic strontium anorthite during crystallization. Additionally, strontium anorthite forms a solid substitutional solution with celsian due to the close ionic radii of Sr2+ and Ba2+ ions. This similarity in ionic size and charge ensures that the basic structural units of the glass network remain unchanged. Moreover, increasing the BaO content to 20 mol.% reduces the coefficient of thermal expansion of the glass from 78⋅10–7 оС-1 to 71⋅10–7 оС-1, while slightly increasing the density from 3.20 g/cm3 to 3.34 g/cm3. The volumetric electrical resistance at 300 оС ranges between 1010.7 and 1011.6 ohm⋅cm, demonstrating the excellent insulating properties of these experimental glasses. The properties of the investigated glasses allow considering them as components of dielectric composite materials that can significantly intensify sintering processes.
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    Thermodynamic Analysis of the Reactions of Strontium Anorthite Formation during the Firing of Thermal Shock Resistance Ceramics Based on the Eutectic Glasses of the SrO–Al2O3–SiO2 Systems
    (Ukrainian State University of Chemical Technology, Dnipro, 2023) Zaichuk, Oleksandr V.; Sukhyy, Kostyantyn M.; Amelina, O. A.; Hordeieiv, Y. S.; Filonenko, D. V.; Rudnieva, L. L.; Sukha, Iryna V. ; Halushka, S. A.
    ENG: Thermal shock resistance ceramic materials must have a high degree of sintering to ensure the required mechanical strength, erosion resistance, and resistance to high-temperature oxidation. However, the search for effective ways to achieve a high degree of sintering of ceramic materials based on the SrO–Al2O3–SiO2 system at low temperatures requires a large amount of experimental research. The aim of this work is to analyze thermodynamically the reactions of strontium-anorthite phase formation at the points of triple eutectics of the SrO–Al2O3–SiO2 system under low-temperature firing conditions. The eutectic points were selected in the region of strontium anorthite crystallization and had a temperature not exceeding 14000C. It has been established that in the case of compliance with the stoichiometric ratio, the final product of the interaction of the components of eutectic glasses S-1 and S-2 with the charging components is the strontium anorthite phase. The most probable is the formation of strontium anorthite in the interaction of eutectic glass components with Al2O3∙2SiO2, which is a product of kaolinite dehydration (Al2O3∙2SiO2∙2H2O). It has been found that the compounds SrO∙SiO2 and 2SrO∙Al2O3∙SiO2 are most active in the interaction with the charging components in the direction of formation of the strontium anorthite phase than SiO2 tridymite. As a result, the sintering of strontium-anorthite compositions at a temperature of 9000C causes a significant increase in the content of the crystalline phase of strontium anorthite. The determined patterns allow making a reasonable choice of glass in the SrO–Al2O3–SiO2 system for the further manufacture of low-temperature strontium-anorthite ceramics.