International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

Two-dimensional van der Waals (vdW) materials possess novel physical properties and promising applications. A wide range of 2D vdW materials having been obtained via the chemical vapor transport (CVT) method. In this work, we develop the controllable growth meyhod of 2H-NbSe2 single crystals via the CVT method. The quality of fabricated crystals was characterized by X-ray diffraction, and electron dispersive spectrometry (EDS) measurements. Crystals of the best quality were successfully grown under selected temperature/time schedule.

Two-dimensional van der Waals (vdW) materials possess novel physical properties and promising applications. A wide range of 2D vdW materials having been obtained via the chemical vapor transport (CVT) method. In this work, we develop the controllable growth meyhod of 2H-NbSe2 single crystals via the CVT method. The quality of fabricated crystals was characterized by X-ray diffraction, and electron dispersive spectrometry (EDS) measurements. Crystals of the best quality were successfully grown under selected temperature/time schedule.

The work shows that there is no significant change in the phase composition of composites with a change in the synthesis temperature, so we can use pre-synthesized heats at a temperature of 950 oC to obtain hot-stamped aluminum-based composites. The best characteristics of the synthesized titanium carbide were obtained for the composition 45Al-11C-44Ti (%, wt.). The lattice period of titanium carbide for this sample is 0.4324, and the particle size of titanium carbide formed after sintering is 0.8-1.5 μm. The influence of the component composition of the initial charge on the features of the structure and the phase composition of the thermally synthesized heat of the Al-C-Ti system was established.

The article presents the results of studies on the study of the physical and mechanical characteristics of polymeric materials modified with mechanically activated particles. It is shown that the use of mechanically activated nanosized particles makes it possible to achieve a significant effect of increasing operational characteristics at relatively low degrees of modification of 0.05% wt. – 3% wt. The use of modifiers at such concentrations in polymer matrices makes it possible to preserve the basic technology for the processing of polymeric materials and equipment in the manufacture of composite materials on a polymer matrix.

The object of the study was carbon particles obtained by the method of self-propagating high-temperature synthesis. The purpose of the work is the development of compositions and technologies for obtaining competitive composite materials modified with low-dimensional carbon modifiers based on vegetable raw materials.

The most common coatings for metalworking tools include titanium nitride, titanium carbide, titanium carbonitride, zirconium nitride, zirconium carbide, zirconium carbonitride, compounds based on chromium, titanium, aluminum, diamond-like coatings that are formed in vacuum using PVD, CVD, PCVD methods or a combination of the above methods. The current trend in the deposition of vacuum coatings is the production of multifunctional coatings, which can significantly increase operational characteristics compared to the starting materials. To form multifunctional coatings, the creation of “sandwich” structures is used, since each layer performs various functions – forming, antiwear, anticorrosion. Thus, the use of a composite multilayer coating containing layers of titanium nitride, titanium, diamondcontaining compounds with a thickness of one layer from 0.1 to 2 microns makes it possible to increase the wear resistance of a metalworking tool by 1.5-5 times.

The research of the technology of obtaining new copper-ferrochrome composite material has been done. The results of its structure and properties analysis are presented. The material structure consists of the copper base, non-dissolved coarse inclusions of ferrochrome, diffused zones, forming around these inclusions and phases, having formed in the place of completely dissolved inclusions of ferrochrome fine particles. The material has good mechanical properties and a high wear resistance due to the formed solid solutions of the carbides in the copper.

The study of the structure and physicomechanical characteristics of carbon nanostructures, lubricants and cooling liquids was carried out by methods of scanning electron microscopy, atomic force microscopy, IR spectroscopy, physicomechanical and physicochemical analysis. Tribotechnical tests were carried out on a friction machine operating according to the “sphere – plane” scheme.The possibility of modifying various liquid media with nanosized carbon particles of various composition, structure, production technology, including those obtained by the method of self-propagating high-temperature synthesis, has been studied. The studies carried out made it possible to establish general trends in the implementation of the synergistic effect in liquid matrices differing in structure, polarity of macromolecules, and molecular weight.

Methodological approaches to the implementation of the nanostate phenomenon in the formation of the optimal structure of composite materials and metal-polymer systems at different levels of organization have been developed. The concept of energy and technological compliance of functional composite materials and systems components, which determines the optimal parameters of stressstrain, adhesion and tribological properties under technological influences on the components in the process of obtaining composite and its processing, is proposed.

Influence of small Sc, Ag, Zr, Ti, Mn addition on the stabilization of the structural state, the formation mechanisms and kinetics of the phase growth during the aging, and also technological casting properties in the industrial Al-Mg alloys were investigated. It has been established: maximum strengthening in these alloys is reached after the nature aging due to the precipitation of ordered Al3Mg phase that is isomorphic to the matrix. However, under prolonged nature aging the stable Al3Mg2 phase is precipitated in the matrix and on the grain boundary. It is accompanied by fall of the plasticity and decreasing the volume fraction of the strengthening Al3Mg phase. It is succeeded completely to prevent the formation of the stable phase under prolonged nature aging in the alloys quenched in the oi l and additional alloyed by Sc or Ag. Also Ag affects the cracking under the crystallization of alloys favorably. Using the complex of the Zr, Ti, Mn and Sc alloying elements increases the strength properties of the alloy at the quenched state slightly, but accelerates the formation of the stable phase during the nature aging.

The article deals with current situation of design of production lines in modern factories and describes possibilities of realization new type of industry lines. The main research deals with proposal of modular production system established from intelligent manufacturing cells. Main positive features of suggested structure are possibility of rapid reconfigurability of the production line, easy maintenance and possibility of simple and fast design of new production lines, thanks to modularity. To achieve these features in the Industry 4.0 ecosystem is necessary to use of modern communication methods and technologies, such as wireless industrial communication and IoT together with cooperative robots. Moreover, the entire system has to be designed as hierarchical, demand synchronized, flexible and is using standardized construct components.

A series of piston hypereutectic silumin based on Al – (15÷20) % Si, alloyed with copper, magnesium, nickel, chromium is investigated. The mechanical characteristics of ingots from experimental alloys were determined: temporary tensile strength, hardness, relative elongation depending on the composition of the alloys, and temperature coefficient of linear expansion (TCLE). It is shown that the tensile strength of forged blanks is 1.5-2.4 times higher than ingots of hypereutectic silumins. The resulting structure of forgings ensures their high plasticity (relative elongation δ = 5.7÷7.5%; relative narrowing Ψ = 10.3÷14.2%). The optimal mode of heat treatment of deformed silumin is determined: quenching from step heating and aging, which allows increasing the strength of forgings up to 370-470 MPa. Moreover, the plasticity indicators remain at a high level, and the average thermal expansion coefficient of the alloys is (18.0 ÷ 19.2) · 10-6 K-1 in the range of 50 ÷ 200 ° C.