Archive - Электронный научный журнал "ТРУДЫ ВИАМ"

Articles

 


№1 | №2 | №3 | №4 | №5 | №6 | №7 | №8 | №9 | №10 | №11 | №12





1.
dx.doi.org/ 10.18577/2307-6046-2019-0-7-3-11
УДК 330.3:553.493
Doriomedov M.S., Sevastyanov D.V., Shein E.A.
Technological, institutional and economic trends in the industry of rare and rare-earth metals (review)

Technological, institutional and economic trends in the field of rare and rare-earth metals are presented. It was stated that the development of the above-mentioned trends was governed by China’s global leadership in rare-earth industry and general global trends concerning steady supply of rare and rare-earth metals as well as rational utilization of mineral raw materials. Elucidation of trends is of profound importance for development and intensification of domestic industry of rare and rare-earth metals.

Read in Russian

2.
dx.doi.org/ 10.18577/2307-6046-2019-0-7-12-25
УДК 678.8
Petrova G.N., Perfilova D.N., Starostina I.V., Sapego Yu. A.
Research of ways of combination polyurethane thermoplastics with fluoropolymers

In article ways of combination of thermoflexible polyurethane of brand Vitur TM on the basis of simple polyether with In/6 fluoroelastomers SKF-32 and SKF-264V/6 are considered.

Dependence of technological and physicomechanical properties of compositions of thermoelastoplastics (TEP) on ways of combination of initial components is shown: made one- and two-phasic extrusion molding; with use of curative agents for fluoroelastomers and without them; with different options of introduction of components.

Optimum ways of combination of components thermoflexible polyurethane on the basis of simple polyether with In/6 fluoroelastomers SKF-32 and SKF-264V/6 are defined.

Data, confirmatory are provided that at combination of SKF-32 fluoroelastomer and thermoflexible polyurethane of brand Vitur TM occurs increase of firmness of fluorinated composition of TEP to TS-1 fuel and MS-8p oil.

Read in Russian

3.
dx.doi.org/ 10.18577/2307-6046-2019-0-7-26-33
УДК 678.8
Sarychev I.A. S, Serkova E.A., Khmelnitskiy V.V., Zastrogina O.B.
Thermosetting binders for aircraft floor panel materials (review)

A review of thermosetting binders used for the production of three-layer honeycomb floor panels in domestic and foreign practice has been carried out; the main types have been identified. Mechanical properties and fire resistance of floor panels on phenol-formaldehyde and epoxy binders are given. Describes some of the binder compositions and the ways of their physical and chemical modification necessary to meet the requirements for strength and fire safety. Designated features of the production of honeycomb panels, depending on the type of binder. The conclusion was made about the direction of research in the development of new binders for aircraft floor panels.

Read in Russian

4.
dx.doi.org/ 10.18577/2307-6046-2019-0-7-34-41
УДК 620.1
Yakovenko T.V., Bukharev G.M., Bobyreva T.V., Pykhtin A.A., Oparina L.A., Parshina L.N.
Biocidal additives selection for foamed polyurethanes modification

Results of polyurethane foam testing by GOST 9.049–91 and ASTM G21-15 are provided. Tests of a new modified guanidine biocide series Anavidin T-437 were conducted. Biocides were selected to protect foams from microbiological damage. Hereafter presents the comparison of fungicidal action of disperse silver colloidal solution, salts polyhexamethylene guanidine and widely used tebuconazole in relation to the most active microorganisms-destructors of polymers, such as Aspergillus niger and Cladosporium herbarum.

Read in Russian

5.
dx.doi.org/ 10.18577/2307-6046-2019-0-7-42-49
УДК 666.7
Belyachenkov I.O., Shchegoleva N.E., Chaynikova A.S., Vaganova M.L., Shavnev A.A.
Silicon nitride ceramic materials for aviation GTE bearings and methods of manufacturing (review)

Considered materials applicable to the creation of bearings of aircraft gas turbine engines (GTE). The advantages of using ceramic materials are shown in comparison with traditional steels and alloys. The methods of obtaining ceramic materials based on silicon nitride are considered. The prospects of creating high-temperature wear-resistant ceramic materials based on silicon nitride for tribological purposes are shown. The data on the development of silicon nitride ceramics with dry lubricants are given.

Read in Russian

6.
dx.doi.org/ 10.18577/2307-6046-2019-0-7-50-58
УДК 621.762
Batienkov R.V., Efimochkin I.Yu., Khudnev A.A.
The research of a specific electrical conductivity of Mo–W powder alloys obtained by SPS

The relationship between specific electrical conductivity of Mo–W powder alloys obtained by SPS and tungsten content and process parameters was studied in this work. The specific electrical conductivity’s values for the alloy with 20% (wt) tungsten are in the range between 7,10·10-8 and 9,04·10-8 Ohm·m depending on the sintering temperature while with the increase of tungsten content till 30% (wt) the values of the specific electrical conductivity are increasing too and are within the range of 7,83·10-8 to 10,60·10-8 Ohm·m. A porosity alloys phases content and a grain size were determined as having the most impact on a specific electrical conductivity values. The evaluation of the main factors’ influence on a specific electrical conductivity values was carried out.

Read in Russian

7.
dx.doi.org/ 10.18577/2307-6046-2019-0-7-59-66
УДК 669.046.516.2
Piskorsky V.P., Valeev R.A., Korolev D.V., Morgunov R.B., Rezchikova I.I.
Terbium and gadolinium doping influence on thermal stability and magnetic properties of sintered magnets Pr–Tb–Gd–Fe–Co–B

It has been shown theoretically that sintered magnets Pr–Tb–Gd–Fe–Co–B containing terbium possesses higher saturation magnetization in comparison with sintered magnets with the same chemical composition doped with dysprosium. The calculated value of temperature coefficient of induction (TKI) of the main magnetic phase in the temperature range -60÷+120°С has been determined. It makes magnets based on terbium the most temperature-stable of all known rare-earth magnets. The decreasing dependence of volume content of the main magnetic phase 2-14-1 on the atomic concentration of cobalt in the sintered material (Pr, Tb)–(Fe1-yCoy)–B was experimentally obtained. This dependence shows that properties of prepared magnets with the growth of the concentration Co declines, in spite of improvement in the properties of phase 2-14-1. It is established that this tendency is absent in magnets terbium and the phase 2-14-1 is formed at any concentrations of Co, that allows increasing magnetic anisotropy and, consequently, all other operational characteristics of the magnets.

Read in Russian

8.
dx.doi.org/ 10.18577/2307-6046-2019-0-7-67-75
УДК 530.152.1530.152.1
Morgunov R.B., Koplak O.V., Talantsev A.D., Korolev D.V., Piskorsky V.P., Valeev R.A.
The phenomenology of the magnetic hysteresis loops in multilayer microwires α-Fe/DyPrFeCoB

The shapes of the magnetic hysteresis loops recorded with a Kerr microscope at different points of the α-Fe/DyPrFeCoB microwire were analyzed. Depending on the distance from the ends of the microwire, where the demagnetization field makes a significant contribution to the magnetization, hysteresis loops of various forms were obtained. The micro-wire fragments that are most significant for practical use demonstrate a rectangular hysteresis loop with exchange bias, as well as a hysteresis loop with 4 equilibrium levels of magnetization like a spin-valve device. These data indicate a high practical potential of the obtained microwires for the manufacture of magnetic field, mechanical stress and temperature sensors from them.

Read in Russian

9.
dx.doi.org/ 10.18577/2307-6046-2019-0-7-76-83
УДК 620.1
Krivushina A.A., Bobyreva T.V., Goryashnik J.S., Bukharev G.M.
Study of microorganisms the destructors of functional polymeric materials exposed under conditions of tropical climate simulation

Tests are carried out in various conditions in order to study the microbiological resistance of functional materials and the isolation of new microorganisms-destructors. Polymeric materials and structural elements were exposed for 18 months under imitation of tropical climate weathering conditions. In exposition were used samples of rubber and sealant. Cultures of microscopic fungi were isolated after exposure from the samples surfaces and thereafter their species identified along with theirs occurrence frequency counting. The dominant species of micromycetes were Penicillium lanosum and Cladosporium sphaerospermum. Such species as Penicillium sp. (non P. lanosum), Cladosporium oxysporum and Aspergillus ochraceus were rarely isolated. Single occurrence was noted for Rhizopus oryzae, Aspergillus terreus, Acremonium sp., Stachybotrys chartarum and Trichoderma viride. Most of the isolated fungi are known as destructors of polymeric materials in different climatic zones and environmental conditions.

Read in Russian

10.
dx.doi.org/ 10.18577/2307-6046-2019-0-7-84-91
УДК 620.1:678.073
Laptev A.B., Nikolaev E.V., Kurshev E.V., Goryashnik J.S.
Features of biodegradation of thermoplastics based on polyesters in different climatic zones

Results of research of samples of materials (polyethylene terephthalate, polystyrene) in water of the Black sea (Gelendzhik) and the mineralized water of a circulating cycle of the petrochemical plant (Ufa) are resulted. It was found that the fouling and destruction of the surface in these media occurs in stages: the formation of deposits of mechanical impurities and algae, complete surface coating with bacteria and deposits of calcium salts (both in sea and recycled water), which leads to saturation of the volume of polymer samples with moisture and destruction of the surface by products of bacterial metabolism and causes a decrease in both strength and plasticity of samples of polystyrene and polyethylene terephthalate.

Read in Russian

11.
dx.doi.org/ 10.18577/2307-6046-2019-0-7-92-111
УДК 620.1:678.8
Grinevich D.V., Yakovlev N.O., Slavin A.V.
The criteria of the failure of polymer matrix composites (review)

The paper deals of the main failure criteria of polymer matrix composites, used in modern simulation’s software systems by calculating the strength of composite plates and shells.The limit criteria (for stress and strain) are noted, and the polynomial failure criteria: Tsai-Wu, Tsai-Hill, Yamada-Sun, Hoffman, Cowin, Hankinson, Norris, and separated modes failure criteria: Puck (in various modifications), Hashin, Christensen, LaRC, Cuntze and others. Much attention is given to the theoretical background of the criteria and the applied approaches for the calculation of the strength of composite materials.

Read in Russian

12.
dx.doi.org/ 10.18577/2307-6046-2019-0-7-112-124
УДК 620.193
Movenko D.A., Laptev A.B., Golubev A.V., Kireev D.M.
The analysis of the material surface biodegradation in the petrochemical plant cooling water system

The paper presents the results of a study of the impact of circulating cooling water of a petrochemical plant on steel samples for various periods of time. In addition to the electrochemical mechanism of corrosion caused by the presence of galvanic couples on the metal surface, the samples are affected by the biological factor, namely, the accumulation of simple algae contained in the circulating water and producing oxygen in the presence of sunlight. Measures to reduce the intensity of corrosion damage to steel in a petrochemical plant were proposed.

Read in Russian