Articles
This article discusses the stages of manufacturing models from the magnesium complex, including the development of computer models, the development of models and experimental models, calculation and analysis of the results when developing models of virtual bays using software systems. Various methods of supplying molten metal to a selected embodiment are considered. Work was carried out to prevent possible defects in the ProCast program. As a result, the work was carried out with the help of equipment printed on a 3D-printer, sand forms.
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This article discusses the influence of the plasma spheroidization process on the morphology, microstructure and fractional composition of the VKNA-4U alloy reinforced with Al2O3–Y2O3 particles. During the experiment, it was found that the process of spheroidization significantly affects the morphology of the granuls. Studies show how the morphology of particles changes. After machining, the particles have a fragmentation shape. Due to the process of spheroidization, the granuls take a rounded shape, which affects such a parameter as fluidity, which is necessary for use in plants for additive manufacturing. When analyzing the microstructure, it was found that the particles of the reinforcing filler after plasma spheroidization are shifted to the surface of the granule, in contrast to the initial state after mechanical doping, where the particles of the reinforcing filler are evenly distributed in the volume of the granules.
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This paper presents the basic methods of molding aviation products from polymer composite materials (PCM). For the analysis of the presented methods, a classification is proposed, which is based on the principle of separation into prepreg, non-prepreg, and other methods. The distinctive features of these methods are analyzed, the main technological parameters are considered, the process flow diagrams are presented, as well as the molding equipment circuits, the main advantages and disadvantages are given.
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In work the metal composite material on the basis of the aluminum foundry alloy of the AK7 brand containing 65±1 vol. % silicon carbide was developed and investigated and obtained using the technology of vacuum-compression impregnation. Porous billets with different fractional composition of silicon carbide were obtained by cold compaction followed by impregnation with aluminum alloy melt. Samples were made for the study of thermal conductivity and heat capacity of a composite material with different fractional composition of silicon carbide. Measurements of the characteristics of the thermophysical properties – heat capacity, thermal conductivity and thermal diffusivity in the temperature range from -100 to +400°C – of a composite material with different fractional composition of silicon carbide were carried out.
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The raw material for the production of carbon fibers is a precursor – polyacrylonitrile, from which polyacrylonitrile fibers are made. This article discusses methods for copolymerization of polyacrylonitrile (in solution, in suspension, in melt and in emulsion), and methods for forming fibers from it (wet, dry, dry-wet methods, electrospinning, as well as a promising method for producing from melt), technological process receiving fibers. The advantages and disadvantages of copolymerization methods and molding methods are also considered.
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Assesses three methods for determining the hydrogen content in metallic materials: optical emission, heating in a carrier inert gas with a conductometric termination, and vacuum heating with a mass spectrometric end. Also considers the optimal scope of each of the considered methods for solving specific problems aimed at determining the hydrogen content with different binding energies (common, diffusion-mobile, strongly bonded) in metallic materials.
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The basic laws of the development of intergranular corrosion of aluminum alloys after full-scale and full-scale accelerated tests in a moderately warm climate of the coastal zone depending on the alloying system are considered. The effect of the geometric grain sizes of alloys of various systems on the depth of the MCC is shown. The dependences of the loss of mechanical properties under tension on the depth of the MCC for sheets of aluminum alloys with a thickness of 2 mm are established. The data obtained can be used to predict changes in mechanical properties under tension, depending on the degree of development of intergranular corrosion.
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Рresents an analysis of existing on the russian market test pieces for penetrant testing, designed to assess the sensitivity of sets of flaw detection materials and verify the correctness of the process as a whole. The technology of manufacturing test pieces is briefly described. The advantages and disadvantages of these pieces, both domestic and foreign production. On the basis of the conducted analysis the conclusions about expediency of creation of the new pieces considering structural, production and operational features of details are drawn.
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