Last number

 
№1  2018

1.
dx.doi.org/ 10.18577/2307-6046-2018-0-1-1-1
УДК 669.018.95
Y.A. Bondarenko, Kolodiazniy M.Yu., A.B. Echin, Narskiy A.R.
DIRECTIONAL SOLIDIFICATION, STRUCTURE AND PROPERTIES OF NATURAL COMPOSITE BASED ON EUTECTIC Nb–Si AT WORKING TEMPERATURES UP TO 1350°С DEGREES FOR THE BLADES OF GAS TURBINE ENGINE
Investigated the structure and properties of niobium-silicon composite, obtained by directional solidification in the liquid metal cooling method (LMC). Considered natural-the composite microstructure of the ingot after directional solidification, the analysis of the composition of the phases of the composite Nb–Si we determined the level of short-term strength at 20, 1200 and 1350°C and long-term strength at 1200°C. The level of strength at high temperatures a natural composite of Nb–Si is more than two times that of single-crystal nickel superalloys.
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2.
dx.doi.org/ 10.18577/2307-6046-2018-0-1-2-2
УДК 669.017
N.A. Kuzmina, Marchenko E.I., Eremin N.N., Yakushev D.A.
THE STUDY OF DEFECTS INTRODUCTION IN POLYMORPHIC MODIFICATIONS OF NIOBIUM SILICIDE Nb5Si3 BY THE METHODS OF ATOMISTIC COMPUTER SIMULATION
Methods atomistic computer simulations we study the geometry of the environment of impurity atoms of carbon in the crystal structures of α-, β- and γ-Nb5Si3 modifications. The calculated energy structure of the silicides with different concentrations of the element implementation of carbon for α-, β- and γ-Nb5Si3 modifications. Calculated the effect of different concentrations of impurities on the parameters of the structure. On the basis of calculated values of energy and structure parameters estimation of the solubility limit of carbon in these silicides.
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3.
dx.doi.org/ 10.18577/2307-6046-2018-0-1-3-3
УДК 543.51; 669.1
A.V. Alekseev, G.Yu. Rastegayeva, Pahomkina T.N.
EXPERIENCE OF THE DETERMINATION OF CARBON, SULFUR, OXYGEN AND NITROGEN IN ALLOYS BASED ON NIOBIUM ON THE GAS-ANALYZERS OF THE LECO FIRM
A study was made of the possibility of determining the mass fraction of carbon and sulfur in an alloy based on Nb by burning in an induction furnace a gas analyzer CS-444 from Leco, followed by detection in an infrared cell of a spectrometer. A catalyst is selected, with a specially selected composition, which allows full recovery of carbon and sulfur from the analyzed material. Determination of the content of the oxygen and nitrogen mass fraction in the Nb-based alloy was carried out by reductive melting in a stream of an inert carrier gas, followed by detection of oxygen in an infrared cell and nitrogen in a conductometric cell of a TC-600 from Leco gas analyzer. The catalysts required for the complete extraction of these elements from an Nb-based alloy were selected
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4.
dx.doi.org/ 10.18577/2307-6046-2018-0-1-4-4
УДК 546.65
Sevastyanov D.V., Sutubalov I.V., Kulagina G.S.
DIRECTIONS FOR THE DEVELOPMENT OF MANUFACTURING TECHNOLOGIES IN THE FIELD OF RARE EARTH METALS
Based on the analysis of scientific and technical literature, the main trends in the development of manufacturing technologies in the field of rare-earth metals were revealed. These trends include recovery of rare earths from end-of-life products (fluorescent lamps, permanent magnets, Ni-MH batteries) and industrial waste as well as production of high-purity rare earth metals. The special features of the applied technologies and the further development of technological solutions in this area were presented.
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5.
dx.doi.org/ 10.18577/2307-6046-2018-0-1-5-5
УДК 669.721.5
Akinina M.V.
COMPARATIVE RESEARCHES OF PHASE COMPOSITION INFLUENCE ON MECHANICAL AND TECHNOLOGICAL PROPERTIES OF MA20-SP AND MA2-1 MAGNESIUM ALLOYS
The paper presents the comparative investigation results of phase composition influence of new economically alloying MA20-SP alloy and commercial MA2-1 alloy on their based properties under room and elevated temperatures. It was found out the parameters of bending and deep drawing of sheets. It was showed, that alloying MA20-SP alloy by zirconium and cerium (0,25–0,30 mass %) promotes the forming of high dispersed hardening precipitates of phases, the emergence of uniaxial and refine structure and helps to achieve the higher level of mechanical and technological properties in comparison with MA2-1 alloy.
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6.
dx.doi.org/ 10.18577/2307-6046-2018-0-1-6-6
УДК 669.295
N.A. Nochovnaya, P.V. Panin
STUDY OF CHEMICAL COMPOSITION OF LARGE-DIMENSIONED EXPERIMENTAL-INDUSTRIAL INGOT FROM A NEW HIGH-ALLOYED METASTABLE β-TITANIUM ALLOY VT47
Chemical composition studies have been carried out for a large-dimensioned experimental-industrial 1,5 tons ingot from high-alloyed high-strength metastable β-titanium alloy VT47, the ingot having been obtained by threefold vacuum-arc remelting in PSC «VSMPO-AVISMA Corporation». A comparative analysis has been completed for the results of 30 kg laboratory ingots investigation (obtained by VIAM experimental production) and those for the large-dimensioned ingot in order to evaluate the scale factor influence on quality characteristics of VT47 ingots. The possible ways of further metallurgical quality increase have been proposed for large-dimensioned industrial ingots from VT47 alloy.
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7.
dx.doi.org/ 10.18577/2307-6046-2018-0-1-7-7
УДК 669.295:621.78
P.V. Panin, E.A. Lukinа
HEAT TREATMENT EFFECT ON STRUCTURE AND PROPERTIES OF WELDED LARGE-DIMENSIONED SEMI-FINISHED PRODUCTS FROM VT23 TITANIUM ALLOY
The effect of heating temperature and cooling rate on phase composition, structure, and hardness has been studied for bulk metal and weld joint as well as the hereinbefore mentioned parameters influence on bulk metal mechanical properties for a 80 mm thickness plate of VT23 (Ti–5,5Al–2Mo–4,5V–1Cr–0,6Fe, wt.%) titanium alloy. It has been shown, that two-step heat treatment including annealing at a temperature 100–130С lower than polymorphic transformation temperature with a subsequent air cooling and ageing at 625С gives the opportunity both to form a homogeneous structure along the weld joint section and to obtain bulk metal tensile strength higher than 1100 MPa wherein impact toughness is more than 0,3 MJ/m2.
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8.
dx.doi.org/ 10.18577/2307-6046-2018-0-1-8-8
УДК 678.8
Alifanov E.V., A.М. Chaykun, D.S. Gorlov, M.A. Venediktova
FEATURES OF THE MECHANISM OF FRICTION OF ELASTOMERIC MATERIALS OF DIFFERENT TYPES. THEORETICAL AND PRACTICAL ASPECTS (review)
The overview is devoted to the analysis of the mechanism of friction of elastomeric materials. Products from them are in large quantities applied as accessories in products of aviation engineering. Theoretical and practical aspects of friction and wear of polymeric materials including elastomer features of application of lubricant and its influence on character of friction and wear of elastomer Are shown are analyzed. Features of the mechanism of friction of elastomeric materials of different classes are given. Modern development of VIAM Federal State Unitary Enterprise in the field of nonskid polymer coatings for aviation application is shown. Are noted their basic components and defined their technical characteristics.
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9.
dx.doi.org/ 10.18577/2307-6046-2018-0-1-9-9
УДК 620.1:621.792
Bryk Ya. А., D.N. Smirnov
RESEARCH OF FROST RESISTANCE OF AERONAUTICAL SEALANTS
The principles of creating frost-resistant sealing materials are considered. The influence of components (fillers, plasticizers and crosslinking agents) on the frost resistance of sealants was investigated. Two methods for evaluating the frost resistance of sealants have been studied: the determination of the strength and elongation of the material at a negative temperature, the determination of the dynamic shear modulus G and the tangent of the mechanical loss angle tgδ in the negative temperature region. The article presents data on glass transition temperatures of sealing materials, as well as temperature dependences of the dynamic mechanical characteristics of sealants, depending on their polymer base. It is shown that the frost resistance of sealants is an ambiguous concept, since the operability of the material in a structure depends not only on its properties, but also on the characteristics of hermetic joints and the conditions of their operation.
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10.
dx.doi.org/ 10.18577/2307-6046-2018-0-1-10-10
УДК 62-758.34
A.E. Sorokin, Nyrtsov A.V., Shipin N.O., Krayeva A.A., Titkova Yu.M.
FOAMS DESIGNED TO ENSURE THE ABSORPTION OF ACOUSTIC WAVES OVER A WIDE RANGE OF FREQUENCIES
Various porous materials with sound-absorbing properties are considered. The classification of porous materials according to their structural features is given, their purposes are considered. The main attention is paid to porous-cellular materials (foams), among which polyurethane foams are widely used. The results of research work aimed at obtaining new foams and porous composite materials providing effective absorption of acoustic waves over a wide frequency range are presented. Depending on the component composition and concentration of the filler, samples of filled and unfilled polyurethane foams with different structural parameters and performance characteristics were obtained. The influence of the porosity of the foam on the acoustic properties of materials is revealed, the possibility of placing a porous fiber layer inside the foam volume is shown. Prospective foams were considered capable of maintaining performance at elevated tempe-ratures, and the effect of melamine and its
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11.
dx.doi.org/ 10.18577/2307-6046-2018-0-1-11-11
УДК 629.7.023.224
Solntsev St.S., V.S. Denisova, Agarkov A.B., S.V. Gavrilov
THE INFLUENCE OF BaO–Al2O3–SiO2-GLASSES ADDITION ON REACTION-CURED COATINGS PROPERTIES FOR NICKEL ALLOYS PROTECTION
The results of heat-resisant coatings containing the additives of refractory glasses in BaO–Al2O3–SiO2 system are explained. The optimal technological parameters of refractory glasses are estimated, and that was found that the additive of 25% BaO–25% Al2O3–50% SiO2 provides the increase of heat resistance and thermal stability. The compositions of reaction cured coatings provide solid gas-proof non-defective coatings designed to heat-resistant nickel alloys protection at temperatures up to 1250°C.
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12.
dx.doi.org/ 10.18577/2307-6046-2018-0-1-12-12
УДК 66.017
Onuchina M.R., Artamonov A.A., Evdokimov V.B.
STUDY OF THE LATTICE DYNAMICS OF B2 RuAl BY THE FIRST PRINCIPLES METHODS
The first-principle methods were used, the phonon spectrum and the density of the phonon states of B2 RuAl are studied. We used the phonon spectrum of RuAl for calculation: the Grüneisen constant, the volume coefficient of thermal expansion, the Debye temperature, the temperature dependence of the heat capacity, the melting temperature is estimated for RuAl. The bulk modulus of elasticity, the equilibrium values of lattice parameters for RuAl are calculated. It is shown that the calculated data agree well with the experimental data. The calculated parameters are compared with those for the NiAl superalloy.
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