Articles

 


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1.
dx.doi.org/ 10.18577/2307-6046-2015-0-6-1-1
УДК 621.793
Kashin D.S., Stekhov P.A.
PROTECTIVE COATINGS FOR HIGH-TEMPERATURE NIOBIUM-BASED ALLOYS

Different types of protective coatings for high-temperature niobium-based alloys are considered. A complex approach to creation of protective coatings is needed to provide the required protective properties. Further development of protective coatings and niobium-based alloys is also required.

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2.
dx.doi.org/ 10.18577/2307-6046-2015-0-6-2-2
УДК 62-762
Ivakhnenko Yu.A., Varrik N.M.
MATERIALS FOR HIGH-TEMPERATURE SEALANTS (REVIEW)

Materials for high-temperature sealants are reviewed in the article. High-temperature movable sealants with acceptable wear resistance, chemical resistance in aggressive envi-ronment and high elastic properties are uses for sealing of flap doors and hatches and control means of flying vehicles. Generally, butt end sealants and/or stuffing box sealants are used as movable sealants. A wide range of organic, metal, ceramic and combined ma-terials can be used as sealing materials; their choice depends on service conditions.

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3.
dx.doi.org/ 10.18577/2307-6046-2015-0-6-3-3
УДК 62-416:669.725
Fokanov A.N., Podurazhnaya V.F., Tebyakin А.V., Kas’kov V.S.
FOIL MANUFACTURING FROM THE TECHNICAL SINTERED BERYLLIUM OF HIGHER PURITY

Results of the research of 0.15–0.01 mm thick foil made from the technical sintered be-ryllium of high purity (Be≥99%; BeO≤0,7%; Fe≤0,1%) and its properties are presented in the article. Warm rolling of beryllium billets with protective coating was made in welded containers (covers) from stainless steel on the laboratory rolling mill without heating the rollers. Heating of billets for rolling was carried within the temperature range of high ductility of beryllium. Foils microstructures, optical and vacuum tightness, content of oxygen and iron, mechanical properties of 0,15 mm thick foil were studied. Samples of plates and disks made of beryllium foil were demonstrated.

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4.
dx.doi.org/ 10.18577/2307-6046-2015-0-6-4-4
УДК 543.5: 669.293
Alekseev A.V., Yakimovitch P.V., Min P.G.
DETERMINATION OF IMPURITIES IN NB-BASED ALLOY BY ICP-MS METHOD. PART I

Different methods of suppression of spectrum interferences and their efficiency in case of 4% (mass.) content of interference-causing elements were described. Content of Cu, Zn, Se, Ag and Cd in Nb-based alloy was determined by the inductively coupled plasma mass spectrometry method (IСP-MS). An effect of the interference-causing alloying elements (Ti, Cr, Zr and Mo) on the results of determination was investigated. The correctness of this measurement technique was controlled by the «added–found» method. Correction of spec-tral interferences at the addition of interference-causing elements in the test solution allowed to improve the accuracy of measurements and to assess the degree of the effect of mass-spectral interferences for each element to be determined. The use of a collision-reaction cell allowed to reduce the mass-spectral interferences of elements at determination of Cu, Zn, Ag and Cd and, respectively, their detection limits by one or two orders of magnitude as compared to t

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5.
dx.doi.org/ 10.18577/2307-6046-2015-0-6-5-5
УДК 677.53:66.045.3
Zimichev A.M., Varrik N.M., Sumin А.V.
THREADS OF REFRACTORY OXIDES FOR SEALING THERMAL INSULATION

An influence of sizing agents and auxiliary threads on ability to weaving of threads from alumina continuous fibers on the braiding equipment is studied. Tests were carried out to define breaking loading and flexibility of threads. The experiments allowed to establish that the usage of auxiliary threads and sizing agent facilitates application of heat-resistant ceramic threads for production of flexible sealing thermal insulation.

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6.
dx.doi.org/ 10.18577/2307-6046-2015-0-6-6-6
УДК 621.357.546.763
Tyurikov E.V., Tihobrazov A.B., Salakhova R.K.
RESEARCH OF PROPERTIES OF THE DILUTED SELF-REGULATING CHROMIUM PLATING ELECTROLYTE WITH NANO-SCALE ALUMINUM OXIDE PARTICLES

Results of studies of the diluted self-regulating electrolyte with aluminum oxide nanopowder and chromium coatings deposited in this electrolyte are presented in comparison with properties of chromium coatings produced in a standard electrolyte. The studies have shown that the properties of chromium coatings obtained in the diluted self-regulating electrolyte with aluminum oxide nanopowder do not inferior to those of the coatings produced in a standard electrolyte and in some individual indicators are even superior to them

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7.
dx.doi.org/ 10.18577/2307-6046-2015-0-6-7-7
УДК 54.063
Goundobin N.V., Titov V.I., Pilipenko L.V.
DETERMINATION OF THE MASS FRACTION OF TANTALUM IN Fe–Ni–Co–Ta ALLOYS

The aim of this study was to conduct research on the development of methods for determination of tantalum mass fraction (within the range of 2–15% mass.) in Fe–Ni–Co–Ta alloys. In addition to the main alloying elements, the alloy may contain the following impurities: 2–3% mass. of titanium and microimpurities of chromium, aluminum and silicon. Studies on the selection of the conditions for translation of analytical sample of Fe–Ni–Co–Ta alloy into solution. For the subsequent deposition and separation of tantalum from the other alloy components, reagent tannin was selected. An effect of acidity on the completeness of the deposition of tantalum with tannin was studied. It was determined that for elimination of errors in the determination of tantalum due to co-precipitation of titanium a double re-precipitation of tantalum is required. The studies allowed to develop a method of gravimetric determination of the mass fraction of tantalum (within the range of 2–15% mass.) in Fe–Ni–Co–Ta a

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8.
dx.doi.org/ 10.18577/2307-6046-2015-0-6-8-8
УДК 667.64
Eskov A.A., Lebedeva T.A., Belova M.V.
PAINT-AND-LACQUER MATERIALS WITH LOWERED CONTENT OF VOLATILE ORGANIC COMPOUNDS (review)

The development trends of paint-and-lacquer materials, whose production and application are connected with the lowered content of volatile, toxic and flammable or-ganic sub-stances are considered. Various paint-and-lacquer materials are used for painting of a-chitectural objects, metal structures, products from polymeric composite materials. For this purpose, they have to possess good adhesion to surface, good protective and anticorrosive properties, stability to atmospheric and mechanical impacts.

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9.
dx.doi.org/ 10.18577/2307-6046-2015-0-6-9-9
УДК 541.6:539.25
Gulyaev A.I., Juravleva P.L.
METHODOLOGICAL ASPECTS OF THE PHASE MORPHOLOGY ANALYSIS IN MATERIALS BASED ON SYNTHETIC RESINS MODIFIED BY THERMOPLASTICS (review)

Modifying of synthetic resins with thermoplastics efficiently increases fracture toughness of polymer composite. Structurization in thermoset-thermoplastic blends is accompanied by reaction-induced micro-phase separation with forming of characteristic phase morphology. The current state of electron microscopy researches of phase morphology of thermoset-thermoplastic blends and composite materials on their basis is considered in this work. The following methodological problems of electron microscopy research of phase morphology are considered: information provided by research method, contrasting efficiency of characteristic elements of microstructure, justification of key morphological parameters choice and methods of their measurement

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10.
dx.doi.org/ 10.18577/2307-6046-2015-0-6-10-10
УДК 62-758.34
Beljaev А.А., Bespalova E.E., Lepeshkin V.V.
RADIO ABSORBING MATERIALS BASED ON FINISHING CONSTRUCTION MATERIALS FOR PROTECTION AGAINST MICROWAVE RADIATION OF BASE STATIONS OF CELLULAR COMMUNICATION

This article considers the need and possibility of creation of radio-absorbing materials based on finishing construction materials. These materials have to be effective within the ranges of the most widespread working frequencies of the cellular communication base stations. The works were conducted in the field of theoretical investigations and experimental studies of samples of the radio-absorbing structures based on finishing construction materials and in the direction of choosing of radio-absorbing fillers

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11.
dx.doi.org/ 10.18577/2307-6046-2015-0-6-11-11
УДК 614.814.41
Kirienko O.A., Shurkova E.N., Volnyj O.S., Barbotko S.L.
ASSESSMENT OF FIRE SAFETY OF PCM AT FLAME DISTRIBUTION ON HORIZONTAL SURFACE UNDER CONDITIONS OF HEAT FLOW OF VARIABLE INTENSITY

Definition of fire safety characteristics of polymer composition materials (PCM) for manufacturing of components of external components of aviation equipment (fuselage, wing, stabilizers, etc.) was carried out under conditions of variable intensity of the heat flow. Samples of glass- and carbon-reinforced polymers were chosen as test subjects. The tests were carried out in CSI-195FAA camera (Custom Scientific Instruments, USA) with the heat radiation panel. The following characteristics of fire safety were defined during the tests: duration of the residual burning, burn-out length, critical heat flow of flame damping, etc. Assessment of fire safety of glass- and carbon-reinforced polymers by the oxygen index method was additionally carried out.

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12.
dx.doi.org/ 10.18577/2307-6046-2015-0-6-12-12
УДК 678.8
Nikitin E.K., Burkhan O.L., Postnov V.I.
ESTIMATION OF ANNULAR STIFFNESS OF PCM RINGS BY ACOUSTIC RESONANCE METHOD

Measurements of parameters of an acoustic signal excited by own mechanical oscil-lations of a ring made from fiber-reinforced plastics under mechanical impact were carried out; then the annular stiffness of ring was calculated. The method is based on excitation of acoustic signal oscillations, which depend on strength characteristics of the PCM ring.

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