Articles

 


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1.
dx.doi.org/ 10.18577/2307-6046-2015-0-10-1-1
УДК 669.018.44:669.295
Kashapov O.S., Pavlova T.V., Istrakova A.R., Kalashnikov V.S.
EFFECT OF IRON CONTENT ON MECHANICAL PROPERTIES OF FORGINGS FROM HEAT-RESISTANCE TITANIUM ALLOY VТ41

The structure and mechanical properties of forgings from heat-resistant near-α-titanium alloy VТ41 with different iron content are examined in this paper. It has been established that the increase in the iron content leads to the increase in strength proper-ties of the material in the working temperature range and some decrease in characteris-tics of ductility and toughness. Increasing the iron content is accompanied with increased sensitivity to stress concentrators under different types of tests.

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2.
dx.doi.org/ 10.18577/2307-6046-2015-0-10-2-2
УДК 621.793:620.193.27
Zakharova L.V.
ANODIC OXIDE COATING – PROTECTION OF TITANIUM ALLOYS AGAINST HOT SALT CORROSION

Titanium alloys are widely applied in products of aviation engineering operating during long term in all climates including sea climate conditions, where deposition of sea salt on their surface can cause hot salt corrosion at elevated temperatures (≥250°C) accompanied with titanium surface embrittlement. Taking into account the potential danger of hot salt corrosion for high-loaded parts from titanium alloys operating in sea climate conditions at temperatures ≥250°C, the opportunity of identifying of coatings able to protect such parts from the influence of salt deposits seems to be of interest. This paper shows the possibility of protection of the surface of titanium alloys by anodic oxide coating of 10–15 μm in thickness against the impact of NaCl deposits (the main component of sea salt) at temperatures under 500°C, tensile stress and alternating loads.

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3.
dx.doi.org/ 10.18577/2307-6046-2015-0-10-3-3
УДК 669.843:669.295
Titov V.I., Goundobin N.V., Pilipenko L.V.
DETERMINATION OF RHENIUM CONTENT IN TITANIUM ALLOYS

The possibility of photometric determination of rhenium content in alloys based on titanium reagent thiourea is hereby investigated. The developed method is based on a translation of the sample in a solution mixture of hydrofluoric and nitric acids. The molybdenum which prevents the reaction of formation of colored rhenium complex with thiourea binds to calcium oxide. The rhenium content is determined by the calibration curve. The developed method does not require the use of toxic reagents, is more selective and accurate in comparison with previously existing methods. Analysis time is reduced by 2–3 times to 60 minutes. As a result of this work a photometric method for the determination of rhenium from 0,05 to 1% by weight with thiourea in complexly titanium alloys is developed. The error in determining the rhenium content is 5% (rel.).

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4.
dx.doi.org/ 10.18577/2307-6046-2015-0-10-4-4
УДК 669.018.95
Arislanov A.A., Goncharova L.J., Nochovnaya N.A., Goncharov V.A.
PROSPECTS FOR THE USE OF TITANIUM ALLOYS IN LAMINATED COMPOSITE MATERIALS

Prospects for application of titanium alloys for creation of new class of laminated metal-polymers are shown. Comparison of properties of composite materials based on titanium with composite materials based on aluminum and glass plastic is given. The results of research in the field of hybrid materials allow speaking about the effectiveness of use of laminated metal-polymers in modern structures. Special attention is focused on high specific properties of hybrid materials based on titanium alloys. Such laminated composite materials combine high strength and fracture toughness.

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5.
dx.doi.org/ 10.18577/2307-6046-2015-0-10-5-5
УДК 669.14
Dvoretskov R.M., Kurpyakova N.A., Kolmykova N.A., Karachevtsev F.N.
THE PHASE COMPOSITION RESEARCHING OF THE DIFFUSION LAYER OF HEAT-RESISTANT STEEL VKS10-U-Sh

The phase composition of the diffusion layer of high-strength heat-resistant precipitation-hardening steel VKS10-U-Sh, microalloyed with rare-earth metals (REM) after a comprehensive chemical and heat treatment, comprising the steps of vacuum carburizing, strengthening heat treatment (tempering, quenching, maraging and ion-plasma nitriding) has been investigated. The methods of physical-chemical phase analysis (PCPA), electron back scatter diffraction (EBSD) and scanning electron microscopy (SEM) have been used. The data obtained by different methods have allowed finding out which alloying elements form the phase composition of steel and which carbides and nitrides give it the necessary properties.

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6.
dx.doi.org/ 10.18577/2307-6046-2015-0-10-6-6
УДК 621.791.3: 669.721.5
Uridiya Z.P., Mukhina I.Y., Frolov A.V., Leonov A.A.
STUDY OF MICROSTRUCTURE OF MAGNESIUM-ZIRCONIUM MASTER ALLOY AND HEAT-RESISTANT MAGNESIUM ALLOY ML10

This article presents the research of microstructure of magnesium-zirconium and ML10 alloys. It is hard to alloy magnesium with elements for which the fusing temperature is higher than that of magnesium’s. The impurity doping of magnesium alloy with zirconium is processed through the magnesium-zirconium alloy, for which the fusing temperature is lower than the fusing temperature for zirconium. The impurity doping of light materials with zirconium is problematic not only because of the high fusing temperature of zirconium, but also because of its active liaison with other elements such as hydrogen, oxygen, nitrogen, aluminum, ferrum, silicon, carbon and other elements. The quality of alloy has been examined and the reasons of lower drawing of zirconium in the process of making ML10 magnesium alloy had been defined: it is linked with the fact that there are non-soluble intermetallides in the alloy such as zirconium and hafnium with silicon, ferrum and aluminum, and zirconium with oxygen

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7.
dx.doi.org/ 10.18577/2307-6046-2015-0-10-7-7
УДК 621.791
Popov D.A., Ogorodov D.V., Trapeznikov A.V.
ALTERNATIVE SOURCES OF BORON-CONTAINING RAW MATERIALS FOR THE Al–B LIGATURES PRODUCTION (review)

This article describes and analyzes raw materials and production methods of aluminum-boron ligatures such as: direct alloying aluminum with pure boron or borides; aluminothermic reduction of boron compounds, oxygen-containing and oxygen-free; receiving ladle clean boride followed by dissolving them in aluminum (SHS, electroplated carbothermic reduction, etc.).

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8.
dx.doi.org/ 10.18577/2307-6046-2015-0-10-8-8
УДК 677.53
Varrik N.M., Ivakhnenko Yu.A.
FEATURES OF PRODUCING ZIRCONIA FIBERS (review)

Data from scientific publications regarding methods of production of zirconia fiber are provided in the article. Zirconia fiber has good prospects for use as high-temperature thermal insulation due to the highest refractoriness among oxide ceramics, high durability and chemical resistance, especially alkalin. Now there are various techniques for producing zirconia fiber, each of them has both merits and demerits. The review includes the description of the main methods according to the data available in information sources.

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9.
dx.doi.org/ 10.18577/2307-6046-2015-0-10-9-9
УДК 678.4:536.46
Naumov I.S., Petrova A.P., Еliseev O.A., Barbotko S.L.
EXPERIMENTAL RESEARCH IN THE FIELD OF DEVELOPMENT OF ORGANIC SILICON RUBBERS WITH LOW FLAMMABILITY

A brief description of the manufacturing process of rubber compounds based on silicone rubber SKTV-1 and vulcanizates samples of the rubber compounds for research is provided. The description of the conducted researches of physic-mechanical properties and flammability of vulcanizates of rubber compounds on the basis of the silicone SKTV-1 rubber containing different quantity of flame retardants is given. By results of research vulcanizates properties the choice of flame retardants was made for receiving fire-resistant rubber on the basis of silicone rubber of the SKTV-1. Results of experimental research of samples of vulcanizates on the basis of the new organic silicon block copolymer possessing increased heat resistance are given.

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10.
dx.doi.org/ 10.18577/2307-6046-2015-0-10-10-10
УДК 678.026
Sagomonova V.A., Kislyakova V.I., Tyumeneva T.Y., Bolshakov V.A.
THE INFLUENCE OF VIBRATION DAMPING MATERIALS' COMPOSITION ON THEIR MECHANICAL LOSS FACTOR

The research of mechanical loss factor (tgδ) of vibration damping materials of different composition: extensional damping material, materials with metallic and composite constraining layers and ones with different thickness and chemical nature adhesive layers is hereby provided. It has been shown that chemical nature and thickness of adhesive layer alters its damping properties and existence of constraining layer leads to increasing of mechanical loss factor.

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11.
dx.doi.org/ 10.18577/2307-6046-2015-0-10-11-11
УДК 678.01:620.179
Postnov V.I., Burkhan O.L.
DEVELOPMENT OF A SET OF ALTERNATIVE METHODS OF EXPRESS LABORATORY AND PROCESS NON-DESTRUCTIVE CONTROL OF PROPERTIES OF SEMI-FINISHED AND STRUCTURES OF THE PCM ON MAIN STAGES OF THEIR PRODUCTION

The article is devoted to the actual problem of development and implementation in the aviation enterprises the complex of alternative to existing and complementing them methods and means of nondestructive express-control of properties of polymeric composite materials (PCM) in the manufacture of prepregs, structures and components of the FRP at key stages of their production to improve their reliability and increase lifetime. It is paid much attention to the problem of modern automation technology and laboratory express-control of properties of the PCM. Automation of control process at all stages will allow to manage timely the process parameters as during the semi-finished products manufacture, so at the stage of forming structures of the PCM. Control procedures of the dynamic properties of PCM at key stages throughout the production chain of manufacturing structures of the PCM are summarized. The basic principles for the development of controls are given. The theoretical foundations o

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12.
dx.doi.org/ 10.18577/2307-6046-2015-0-10-12-12
УДК 546.56:662.75:543.42
Mikov D.A., Kravchenko N.G., Petrova V.A., Kutyrev A.E.
QUANTITATIVE ANALYSIS OF COPPER IN AVIATION FUEL BY ATOMIC ABSORPTION SPECTROMETRY

Procedure of copper quantitative analysis in the fuel after its corrosion attack against structural materials has been developed to improve the methods of aviation fuel quality assessment. Preparation of fuel for the analysis is carried out by mineralization process. The fuel sample is dissolved in concentrated nitric acid in the presence of hydrogen peroxide until the water-fuel phase boundary is disappeared. Copper concentration is measured by atomic absorption spectrometry with the use of acetylene-air flame on the absorption of copper resonance analytical line (324.8 nm). On the basis of the developed procedure VIAM standard STO 1-595-7-461–2015 «Quantitative analysis of copper in the fuel» was published.

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