Archive - Электронный научный журнал "ТРУДЫ ВИАМ"

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1.
dx.doi.org/ 10.18577/2307-6046-2019-0-11-3-11
УДК 669.721.5
Duyunova V.A., Molodtsov S.V., Leonov A.A., Trapeznikov A.V.
Application of computer modeling methods in the manufacture of complex-contoured shaped casting

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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2.
dx.doi.org/ 10.18577/2307-6046-2019-0-11-12-21
УДК 669.017.165:669.245
Rodionov A.I., Efimochkin I.Yu., Samokhin A.V., Sinayskiy M.A.
The influence of the spheroidization process on the fractional composition and morphology of alloy VKNA-4U in a particle-reinforced sheath Al2O3–Y2O3

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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3.
dx.doi.org/ 10.18577/2307-6046-2019-0-11-22-36
УДК 678.8
Kolpachkov E.D., Petrova A.P., Kurnosov A.O., Sokolov I.I.
Methods of molding aviation products from PCM (review)

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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4.
dx.doi.org/ 10.18577/2307-6046-2019-0-11-37-43
УДК 678.8
Kovalenko A.V., Sidelnikov N.K., Sokolov I.I., Tundaykin K.O.
Spheroplastic with adjustable viscosity for filling sections of honeycomb structures

Studies have been conducted to obtain a filler-spheroplastic with adjustable viscosity for filling areas of multilayer honeycomb structures based on an epoxy oligomer, compatible with the chemical nature and processing modes of cladding materials made of polymer composite materials. The rheological characteristics of polymer bases spheroplastic depending on the content of the modifying additives – toluylendiisocyanate. The influence of the content and characteristics of dispersed fillers on the rheological and physico-mechanical properties of spheroplastic was established. It is shown that the developed materials correspond.

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5.
dx.doi.org/ 10.18577/2307-6046-2019-0-11-44-52
УДК 666.7
Sidorov D.V., Shavnev A.A., Solodkin P.V., Kirilin A.D.
Quantum chemical calculation of intermolecular interaction methylsilane molecules during the pyrolysis process

The article describes theoretical investigation for produce more favorable chemical structure from two molecules methylsilane during the pyrolysis process. In this investigation, we used quantum chemical calculation by second order Moller–Plesset perturbation theory with 6-311+G (d) basis set. It was used for chemical structure geometry optimization, computation thermodynamic data and estimate intermolecular interaction energies of chemical reactions. The calculated results showed that reaction with produce methyl(sililmethyl)silane are more favorable in case of the intermolecular interaction.

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6.
dx.doi.org/ 10.18577/2307-6046-2019-0-11-53-59
УДК 669.018.95
Nyafkin A.N., Loshinin U.V., Kurbatkina E.I., Kosolapov D.V.
Investigation of influence of silicon carbide fractional composition on thermal conductivity of composite material based on aluminium alloy

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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7.
dx.doi.org/ 10.18577/2307-6046-2019-0-11-60-67
УДК 537.622.4
Koplak O.V., Kunitsyna E.I., Valeev R.A., Korolev D.V., Piskorsky V.P., Morgunov R.B.
Ferromagnetic microwires α-Fe/(PrDy)(FeCo)B for micromanipulators and polymer composites

Technology of manufacturing of the α-Fe microwires of 30 μm diameter covered with amorphous (PrDy)(FeCo)B phase with high magnetostriction is developed. The microwires satisfy to technical conditions in rectangular shape of their magnetic hysteresis and geometric parameters. Note that one of the technologies for manufacturing permanent rare-earth magnets includes the stage of preparation of the amorphous phase, which then crystallizes, forming crystallites with a given direction of the main axes of magnetization (magnetic texture). It is this stage that leads to the production of microwires with functional properties.

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8.
dx.doi.org/ 10.18577/2307-6046-2019-0-11-68-74
УДК 678.745.32
Timoshkov P.N., Sevastyanov D.V., Usacheva M.N., Khrulkov A.V.
Existing and promising technologies for producing PAN fibers (review)

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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9.
dx.doi.org/ 10.18577/2307-6046-2019-0-11-75-84
УДК 66.017
Davydov D.M., Titov V.I., Letov A.F., Lutsenko A.N.
Comparative evaluation of methods for determining the content of hydrogen in metal materials

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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10.
dx.doi.org/ 10.18577/2307-6046-2019-0-11-85-94
УДК 620.193:669.715
Abramova M.G., Goncharov A.A.
Crystalline corrosion deformable aluminum alloys during natural and natural accelerated corrosion tests

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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11.
dx.doi.org/ 10.18577/2307-6046-2019-0-11-95-103
УДК 620.179
Golovkov A.N., Kulichkova S.I., Kudinov I.I., Skorobogatko D.S.
Analysis of existing test pieces for testing of sensitivity of flaw detection materials during penetrant testing (review)

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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12.
dx.doi.org/ 10.18577/2307-6046-2019-0-11-104-112
УДК 582.288.4
Krivushina A.A., Bobyreva T.V.
Property persistence of «kerosene» fungus hormoconis resinae strains during long-term storage in the laboratory

The property persistence of Hormoconis resinae (or «kerosene» fungus), seven strains was studied after many years of storage in the collection by subculture on nutrient media. It was shown that all strains retained their ability to grow due to hydrocarbon aviation fuel, but the lag phase increased significantly (or the time required to starting active growth in fuel) – from 1 to 3 months. Lag phase of re-isolated strains deceased to 10–14 days. These strains were deposited in the FSUE «VIAM» museum collection of microorganisms by lyophilization and cryogenic freezing. Since the fungal resistance tests duration according to GOST 9.023–74 is 21 days, the results should be taken into account when choosing a storage method and cultivation conditions before testing.

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