Articles

 


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1.
dx.doi.org/ 10.18577/2307-6046-2017-0-1-1-1
УДК 629.7.023.224
Kashin D.S., Stekhov P.A.
Development of heat-resistant coatings for parts made of heat-proof niobium-based alloys

Isothermal heat resistance of samples from niobium-based alloy with heat-resistant coatings for GTE parts was researched at temperature of 1350°С based on 15 h. Researches of coating microstructures in the original form and after the heat resistance test were carried out on samples of a heat resistant niobium-based alloy with coatings. Coatings Si and Cr+Si after tests have homogeneous structure and provide protection of specimens from niobium-based superalloy. The influence of the structural heterogeneity of surface of the samples from heat-resistant niobium-based alloy was analyzed, the protective properties of the heat-resistant coating were studied. It have been determined that defects in the surface layer of the heat-resistant niobium-based alloy leads to catastrophic reduction in the heat resistance of the coating. The work is executed within the implementation of the complex scientific direction 17.3. «Multilayer heat-resisting and heat-protective coatings, nanostructural stre

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2.
dx.doi.org/ 10.18577/2307-6046-2017-0-1-2-2
УДК 669.018.44
Smirnov A.A., Budinovskiy S.A.
Investigation of the effect of the barrier layer on heat-resistant protective coating for turbine blades from ZhS32 alloy

The effect of the nitride and carbide barrier layers on heat resistance of the compositions of superalloy ZhS32 with heat-resistant coatings was studied. Investigations of the barrier layer microstructure in the coating structure in original form and after heat resistance test at temperatures 1150 and 1200°C on the basis of 500 and 100 hours accordingly were carried out. Kinetics change of the barrier layers and their influence on the protective properties of the coating was studied. It has been found that the use of the nitride barrier in the structure of heat-resistant protective coating composition Ni–Cr–Al–Ta–Re–Y–Hf+Al–Ni–Y improves the heat resistance of composition «ZhS32–coating». The work is executed within the implementation of the complex scientific direction 17.3. «Multilayer heat-resisting and heat-protective coatings, nanostructural strengthening erosion, corrosion, wear-resistant and antifretting coatings for protection of hot section parts and GTЕ/GTU compressor» («The

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3.
dx.doi.org/ 10.18577/2307-6046-2017-0-1-3-3
УДК 620.179:620.197
Medvedev P.N., Muboyadzhyan S.A.
X-ray diffraction studies of electron beam ceramic thermal barrier coating layer based on ZrO2•Y2O3

The structure of the ceramic thermal barrier coating layer deposited on the blade of nickel alloy has been evaluated in the paper. The structural aspect is a crystallographic texture and the estimation parameters are an axis and scattering texture. Methodological questions of obtaining this information from the x-ray diffraction spectrum have been observed. These characteristics allow determining the crystallographic growth direction of the coating columnar grains. The average deviation of the grain growth from normal to the surface is 10 degrees. The inverse pole figure analysis method for texture parameters quantifying has been developed in the work.

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4.
dx.doi.org/ 10.18577/2307-6046-2017-0-1-4-4
УДК 621.9.044
Popova S.V., Dobrynin D.A., Muboyadzhyan S.A., Budinovskiy S.A.
Removal of heat resisting condensation and diffusion coatings from the surface of GTE blades before and after the operating time

The significant part of the blade repair technology is removing used coatings from the surface of complex geometry blade. A method has been developed for removal of heat resisting condensation and diffusion coatings in electrolytic plasma by directional jet of electrolyte. This method allows uniform layer-by-layer removing heat resistant coatings from heat-resistant nickel alloys. The peculiarity of the process is a universality of usable electrolytes not requiring component correction in dependence on heat-resistant coating and alloy composition. The work is executed within the implementation of the complex scientific direction 10.11. «Power-efficient, resource-saving progressive technologies of machining of metal and non-metallic materials» («The strategic directions of development of materials and technologies of their processing for the period till 2030»)

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5.
dx.doi.org/ 10.18577/2307-6046-2017-0-1-5-5
УДК 669.018.95:621.775.8
Grishina O.I., Serpova V.M.
Aspects of mechanical properties of metal matrix composites reinforced with continuous unidirectional fibers (review)

Control of elastic-plastic behavior of metal matrix composites reinforced with continuous fibers is the most important task of defining performance of both material and structural elements. The paper discusses methods of control, which together provide a complete understanding of fracture mechanism, strength and elastic characteristics of the metal matrix composites reinforced with continuous unidirectional fibers. It is shown that the behavior of material when applying the load specifically depends on technological defects arising during manufacture.

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6.
dx.doi.org/ 10.18577/2307-6046-2017-0-1-6-6
УДК 677.014
Zimichev A.M., Varrik N.M., Sumin А.V.
Research of the process of extrusion of continuous high-melting fibers

The ceramic fibers are priority subject to develop for their use as a main component of heat-shielding and heat-insulating materials for high-temperature purpose. This work investigates features of the process of formation of continuous alumina fiber by sol-gel method and also formation of inclusions in high-density fiberizing solutions during evaporation. It is established that existence of the second liquid phase in forming solution can interfere with the formation process.

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7.
dx.doi.org/ 10.18577/2307-6046-2017-0-1-7-7
УДК 669.018.95
Postnova M.V., Postnov V.I.
Role of MPСM structures and their effect on vibration fatigue characteristics of GTE constructive components

During operation of a reverser of D18T engine 32 cases of damaged skin from D16 alloy of RU-18T reverser mobile case are revealed. In order to increase in service life of this unit it has been decided to use metal-polymeric material Alor D16/41 as a skin material of internal path (crown type). For commercial introduction of metal-polymeric material Alor D16/41 into a structure of airplane manufacturing research of its properties has been conducted. The researches have shown that forming ability of layered MPCM depends on the fiber reinforcement lay-out relative to the direction of deformation Besides all known technological processes of parts forming have been developed. Since units of the reverser are subjected to vibroacoustic impact in the process of operation researches on their sound insulation have been conducted. Application of Alor D16/41 as a skin material in engine nacelle allowed reducing in weight of the structure by 10% and considerable improving of its vibration fatigue p

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8.
dx.doi.org/ 10.18577/2307-6046-2017-0-1-8-8
УДК 678.067.5
Melnikov D.A., Gromova A.A., Raskutin A.E., Kurnosov A.O.
Theoretical calculation and experimental determination of modulus of elasticity and strength of GRP VPS-53/120

In the article theoretical approaches to calculation of elastic – strength characteristics at tension of composite materials on the basis of woven fillers are given. Manufacturing methods of samples of curing binders for tension tests are described. The influence of manufacturing method of samples on defined elastic and strength characteristics of epoxy resin VSE-34 is investigated. Theoretical calculations are carried out and experimental data of strength and elastic modulus are obtained for VPS-53/120 fiberglass at tension. Comparison of theoretically calculated values with experimental ones is given.

The work is performed within the implementation of the complex scientific direction 13.2. «Constructional PСM» («The strategic directions of development of materials and technologies of their processing for the period till 2030»)

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9.
dx.doi.org/ 10.18577/2307-6046-2017-0-1-9-9
УДК 620.179
Titov V.I.
Photometric determination of tantalum (1,0–5,0 wt. %) in refractory niobium alloys with a reagent pyrogallol

This paper presents researches on the development of a methodology of defining tantalum in refractory niobium alloys with a reagent pyrogallol. The publications on the subject from various sources are analyzed. Upon summary review of the data and performed work it has been revealed that determination of tantalum with pyrogallol in refractory niobium alloys is possible in the presence of matrix as niobium and alloying chemical elements (zirconium, hafnium, titanium). Only alloying molybdenum also forms a colored complex, the absorbance of which is proportional to the concentration of molybdenum. In order to mitigate molybdenum content interfering determination of tantalum content a curve for the determination of tantalum is constructed taking into account the influence of molybdenum. To prevent oxidation of pyrogallol by atmospheric oxygen (whereby it becomes dark) the color reaction is carried out in reducing medium. Thus, the developed method allows direct photometric determinatio

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10.
dx.doi.org/ 10.18577/2307-6046-2017-0-1-10-10
УДК 620.1:669.295
Orlov M.R., Naprienko S.A.
Destruction of two-phase titanium alloys in sea water

Features of static and low-cyclic fatigue fracture of two-phase titanium alloys VT3-1, VT6, VBT8, VT9, VТ18U and VТ22 in sea water and air were investigated by scanning electron microscopy. Threshold values of stress intensity factors in the conditions of static and low-cyclic loading corresponding to the beginning of crack propagation were determined by the mechanism of corrosion cracking. Work is performed within implementation of «The strategic directions of development of materials and technologies of their processing for the period till 2030» [1]: – direction 2. «Fundamental oriented researches, qualification of materials, non-destructive testing»; – direction 18. «Environmental test for providing protection of materials, structures and complex technical systems against corrosion, aging and biodamages».

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11.
dx.doi.org/ 10.18577/2307-6046-2017-0-1-11-11
УДК 678.747.2
Boychuk A.S., Chertishchev V.Yu., Dikov I.A.
Manufacturing of CFRP test samples with different porosity for its evaluation by non-destructive testing

Test of ways of obtaining special CFRP specimens with different porosity by autoclave molding and infusion method are observed in this paper. For infusion method these results were obtained by low compression, air pumping-in to binder, lower binder input and addition of pore-forming agent. For autoclave molding these results were obtained without external pressure and molding at heat chamber with vacuum slide into the bag to 0,03–0,05 at.

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12.
dx.doi.org/ 10.18577/2307-6046-2017-0-1-12-12
УДК 678.4
Chaykun A.М., Naumov I.S., Alifanov E.V.
Rubber sealing materials (review)

Creation and application of rubber sealing materials are described. The main types of sealants are shown as well as features of their design and operation. Both sealants of mass use and special functions are described. Their main utilization properties and features of application are given. The main properties of rubbers applied to manufacture of sealants are shown.

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