Articles

 


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1.
dx.doi.org/ 10.18577/2307-6046-2014-0-8-1-1
УДК 669.715
Goncharenko E.S., Alyabev I.P., Trapeznikov A.V., Ogorodov D.V.
OBTAINING OF COSTS FROM VAL20 ALLOY BY OPTIMIZATION THE DESIGN OF ELEMENTS OF JSC «TUPOLEV»

Major aluminum cast products are made by green sand casting that requires almost 100% machining. Improving of efficiency, manufacturability and quality of foundry air-craft industry can be achieved at the expense of the application of modern information technologies at the stage of design and technological preparation of production. In the article the calculation of the 3D-models of steering parts for manufacturing of shaped castings from modern high-strength alloy VAL20. 3D print of molds and models for making castings with optimal design, high size precision and minimum machining allow considerably reduce time of castings production. Economic efficiency of this casting method is shown on example of specific steering part made from VAL20 alloy compared with same part made from serial AL9-1 alloy.

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2.
dx.doi.org/ 10.18577/2307-6046-2014-0-8-2-2
УДК 669.725
Fokanov A.N., Kas’kov V.S., Podurazhnaya V.F.
BERYLLIUM BRAZING WITH MONEL ALLOY IN PRODUCTION X-RAY WINDOWS

The outcome of researches in the field of the methods of brazed joints of dissimilar metals – beryllium and monel silver-based alloy and advanced development model of silver substitution copper-based alloy, developed by Federal State Unitary Enterprise VIAM is the subject of the article. As a matter of course vacuum brazing data was cited as well as vacuum tightness of brazed windows. The researches suggested the possibility of obtaining vacuum-tight brazed joints which provide resistance of thermal cycles simulating welding of beryllium windows into body of pipe and when in operating heating process up to 500°C while brazing alloy 72Ag–28Cu «Cusil», up to 650°С while brazing alloy 92,5Ag–7,5Cu «Sterling Silver» and advanced development model of silver substitution copper-based brazing alloy Cu–Be–Ni. The cause of increasing resistance to the effects of thermal cycles is the result of silver increase and alloy melting point 92,5Ag–7,5Cu, increase of elasticity and heat-absorptive capac

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3.
dx.doi.org/ 10.18577/2307-6046-2014-0-8-3-3
УДК 678.84
Varrik N.M., Ivakhnenko Yu.A., Maximov V.G.
OXIDE-OXIDE COMPOSITES FOR GAS-TURBINE ENGINES

Ceramic composite oxide-based materials attract the attention of the developers for use in environments where metal materials exhibit a tendency to creep and oxidation. High-temperature ceramic composites, methods of obtaining and properties of the re-sulting materials are the object of special attention at international conferences and congresses on ceramics in the last fifteen years. Aluminum oxide is one of the most promising ceramic materials for a wide range of applications in extreme conditions thanks to its combination of high hardness, heat re-sistance, chemical inertness, with its accessibility and efficiency. However, the use of alumina-based materials in loaded conditions is limited for the low impact resistance, typical for ceramics. Rapid crack propagation under shock loads reduces the reliability of the materials, so the material engineers, conduct research mechanisms of crack propagation, offer many different additives for oxide matrices and processing methods, contrib

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4.
dx.doi.org/ 10.18577/2307-6046-2014-0-8-4-4
УДК 678.8
Timoshkov P.N., Khrulkov A.V.
MODERN TECHNOLOGIES OF HOTMELT POLYMER COMPOSITE MATERIALS PROCESSING

At present time polymer composite materials (PCM) based on hotmelt binder have become increasingly popular displacing traditional solvent-based PCM. This fact make possible the emergence of perspective new ways of PCM processing and allows to sim-plify and reduce the cost of PCM-based constructions and products forming process. To make it real new technological processes and new types of industrial equipment having different characteristics compared with previously known, and a number of associated auxiliary equipment have been developed.

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5.
dx.doi.org/ 10.18577/2307-6046-2014-0-8-5-5
УДК 678.8
Krasnov L.L., Kirina Z.V., Еliseev O.A.
FEATURES OF FORMING PRESSED FIBER REINFORCED PLASTIC ON THE BASIS OF MODIFIED PHENOL-FORMALDEHYDE BINDING

In work dependence has been used of physical, mechanical, technological, operational properties of pressing material on length of fiber, temperature, time of drying and prepreg storage life on the basis of the modified phenolic resin and carbon-silicious filler is used.

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6.
dx.doi.org/ 10.18577/2307-6046-2014-0-8-6-6
УДК 678.8
Dement’eva L.A., Serezhenkov A.A., Lukina N.F., Kutsevich K.E.
PROPERTIES AND APPOINTMENT OF COMPOSITE MATERIALS BASED ON ADHESIVE PREPREGS

The properties of composite adhesive materials (CAM) adhesive composite materials based on the wide range of adhesive prepregs based on glass- and coal fillers are re-sulted. The information about the benefits and features of the technological process of manufacturing PCM elements out of adhesive prepregs are resulted. The appointment of CAM – for the manufacturing parts out of PCM, including the honeycomb structure, sin-gle or double curvature, designed for working at temperatures 80–175°C are shown.

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7.
dx.doi.org/ 10.18577/2307-6046-2014-0-8-7-7
УДК 667.64:62-492.2
Semenova L.V., Beider E.Ya., Petrova G.N., Nefyodov N.I.
ELECTRO-INSULATIVE PROPERTIES OF POLYMER COATINGS

The basic electrical characteristics of domestic powder coatings, paint-and-lacquer materials (PLM) and compounds (specific volume electrical resistance, dielectric loss tangent, the breakdown voltage, dielectric constant) are adduced. The properties of the coatings, as in the initial state and after thermal aging in air and hydrostat were con-sidered.

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8.
dx.doi.org/ 10.18577/2307-6046-2014-0-8-8-8
УДК 678.6
Kuznetsova V.A., Kuznecov G.V., Shapovalov G.G.
INVESTIGATION OF EPOXY RESIN MOLECULAR MASS INFLUENCE BY PHYSIOMECHANICAL PROPERTY AND EROSIVE RESISTANCE OF COATINGS

The influence of molecular weight epoxy resins and nature hardeners on the adhesive strength, elastic properties and erosive resistance of the lacquer coatings. It was shown that adhesive strength and elastic properties coatings monotonically change with molecular weight of epoxy resins. Resistance of coatings gas-abrasive erosive resistance depends on the molecular weight and the nature of hardeners, and in large measure determined by the elastic properties of coatings.

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9.
dx.doi.org/ 10.18577/2307-6046-2014-0-8-9-9
УДК 678.7
Chaykun A.М., Venediktova M.A., Еliseev O.A., Naumov I.S.
RESEARCH OF OIL RESISTANCE FROM BASIS BUTADIYEN–NITRILE RUBBERS MADE USING EMULSIFIERS OF DIFFERENT TYPES

In article features of oil resistance rubber compounds are presented on basis bu-tadiyen-nitrile rubbers (BNK) which have been synthesized with use of emulsifiers of different types. Properties butadiyen-nitrile rubbers will be defined not only the content of acrylenitrile links of rubber, but also features of its polymerization. Recently in connection with toughening of ecological requirements, along with traditional emulsifier – nekaly, are used easily washed away alkylsulfonates. In the article the wide complex of properties oil resistance butadiyen-nitrile the rubbers made of BNK with use of emulsifiers of different types is investigated. In the carried-out research the factors influencing oil resistance of rubbers, made of rubbers with different emulsifiers are defined. The dependences revealed in work allow to predict in the maximum degree properties bu-tadiyen-nitrile rubbers made on the basis of rubbers with use of emulsifiers of different types.

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10.
dx.doi.org/ 10.18577/2307-6046-2014-0-8-10-10
УДК 669.15:669.018:543.4
Goundobin N.V., Titov V.I., Pilipenko L.V., Dvoretskov R.M.
SPEKTROFOTOMETRIC DEFINITION NIOBIUM IN THE HEAT RESISTING NICKEL ALLOYS CONTAINING TANTALUM

The technique definitions of mass fraction Nb in heat resisting nickel alloys in a range of concentration of 0,5–3,5% of weights by absorption spectrofotometrical method is developed at the simultaneous maintenance in alloys Ta (0,5–6,0% of weights). For increase of accuracy and cleanliness of carrying out of analysis Nb and Ta preliminary separates from disturbe components and from basis of alloy by phenilarsenium acid. The disturbe cous of Zr and Hf, what separates together with Nb and Ta, separetes with binding it’s a stable complex with a reagent complexon III. The analysis is conducted with a reagent sulphonitrazo E by spectrofotomttrical measurement of optical density of a solution on length of a wave λ=560 nanometers. Calculation of maintenance Nb is made on the standard sample of a nickel alloy with the certified maintenance Nb spent through all stadies of the analysis with addition in its a standart solution Ta in quantity equal its maintenance in the analyzed alloy.

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11.
dx.doi.org/ 10.18577/2307-6046-2014-0-8-11-11
УДК 669.14
Grigorenko V.B., Morozova L.V., Orlov M.R.
RESEARCH OF THE REASONS OF EMERGENCE OF SITES WITH DIFFERENT MORPHOLOGY OF A BREAK IN SHOD PREPARATIONS FROM STEEL 38HN3MFA

Destruction surface of shod preparations from steel 38ХН3МФА with the lowered sulfur content and phosphorus are investigated. The reasons of formation of sites of dif-ferent morphology in breaks are established.

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12.
dx.doi.org/ 10.18577/2307-6046-2014-0-8-12-12
УДК 678.84
Bespalova E.E., Beljaev А.А., Romanov A.M., Shirokov V.V.
INVESTIGATION OF THE DIELECTRIC CHARACTERISTICS OF DESIGNED FOR ANECHOIC CHAMBERS LAMINATED RADAR ABSORBING MATERIAL LAYERS BASED WITH CARBONIZED FIBER FILLED FOAM ASBESTOS

Experimental investigation of the dielectric characteristics of designed for lining of anechoic chambers laminated radar absorbing material layers is performed. The results of measurements on 3 frequencies are compared with the results of calculations. Analysis comparing the measured and calculated characteristics showed close agreement and confirmed the selection of empirical coefficients in the formulas for the calculation of the permittivity of the foam asbestos filled with carbonized fiber.

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