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Journal Perspektivnye Materialy 

 
Potential of porous silicon as a coating material for drug-eluting stents: A brief review

 

O. A. Kashin, K. V. Krukovskii, A. I. Lotkov

 

An analysis of available data suggests that mesoporous silicon with its high biocompatibility and biodegradability is a promising coating material for polymer-free drug-eluting stents. In the paper, we provide a brief review of these data, formulate basic requirements for porous silicon coatings as a drug carrier in intravascular metal stents, and present experimental results which demonstrate the possibility of forming a highly adhesive continuous silicon coating up to 0.6 µm thick on both the outer and the inner stent surface.

Keywords: drug-eluting stent, porous silicon, coating.

DOI: 10.30791/1028-978X-2019-12-5-19

Kashin Oleg — Institute of strength physics and materials science of Siberian branch Russian Academy of Sciences (ISPMS SB RAS, 634055, Tomsk, prosp. Akademichesky, 2/4), Dr Sci, chief researcher. E-mail: okashin@ispms.tsc.ru.

Krukovskiy Konstantin — Institute of strength physics and materials science of Siberian branch Russian Academy of Sciences (ISPMS SB RAS, 634055, Tomsk, prosp. Akademichesky, 2/4), PhD, research scientist. E-mail: kvk@ispms.tsc.ru.

Lotkov Aleksander — Institute of strength physics and materials science of Siberian branch Russian Academy of Sciences (ISPMS SB RAS, 634055, Tomsk, prosp. Akademichesky, 2/4), Dr Sci (Phys-Math), professor, head of laboratory. E-mail: lotkov@ispms.tsc.ru.

Reference citing

Kashin O. A., Krukovskii K. V., Lotkov A. I. Vozmozhnosti i perspektivy ispol'zovaniya poristogo kremniya dlya sozdaniya vnutrisosudistyh stentov s lekarstvennym pokrytiem (Kratkij obzor) [Potential of porous silicon as a coating material for drug-eluting stents: A brief review]. Perspektivnye Materialy — Advanced Materials (in Russ), 2019, no. 12, p. 5 – 19. DOI: 10.30791/1028-978X-2019-12-5-19

Influence of manufacturing method on microstructure
and properties of VKM25 cermet material

O. A. Bazyleva, I. Yu Efimochkin, E. G. Arginbaeva, R. S. Kuptsov

The paper presents the results of a study of the influence of methods for manufacturing a metal-ceramic composite material based on the intermetallic Ni3Al matrix. According to the first method, composite material obtained by mechanical alloying nanoscale oxides of complex composition of an intermetallic alloy powder. The alloy was melted by a vacuum induction method and atomized on the plant HERMIGA 10/100 VI. Then the composite powder was compacted, consolidated according to the hybrid spark plasma sintering method on the FCT H-HP D 25 unit and/or hot isostatic pressed on the “Quintus-40”. According to the second method, the IADM was mechanically doped with the powder of the initial components in the ratio of the chemical composition of the intermetallic matrix and the volume content of oxides, then the composite powder was consolidated in the FST H-HP D 25 unit and/or hot isostatic pressed on the “Quintus-40” and hot upset forged.

 

Keywords: nickel intermetallide, granules, powder, structure, composition, reinforcing filler, oxides, dispersion-strengthened, mechanoactivation, gasostat, hot isostatic pressing.

DOI: 10.30791/1028-978X-2019-12-20-30

 

Efimochkin Ivan — All-Russian Scientific Research Institute of Aviation Materials (17, Radio ul, Moscow, 105005, RF), laboratory chief, specialist in powder metallurgy. E-mail: iefimochkin@mail.ru.

Bazyleva Olga — All-Russian Scientific Research Institute of Aviation Materials (17, Radio ul, Moscow, 105005, Russian Federation), PhD (Eng), deputy laboratory chief for science, specialist in high-temperature casting intermetallide alloys.

Arginbaeva Elvira — All-Russian Scientific Research Institute of Aviation Materials (17, Radio ul, Moscow, 105005, RF), PhD (Eng), sector chief, specialist in high-temperature casting intermetallide alloys. E-mail: elargin@mail.ru.

Kuptsov Roman — Federal State Unitary Enterprise All-Russian Scientific Research Institute of Aviation Materials (17, Radio ul, Moscow, 105005, RF), engineer 2 category, specialist in powder metallurgy.

Reference citing

Bazyleva O. A., Efimochkin I. Yu., Arginbaeva E. G., Kuptsov R. S. Issledovanie vliyaniya sposoba izgotovleniya metallokeramicheskogo kompozicionnogo materiala VKM25 na mikrostrukturu i svojstva [Influence of manufacturing method on microstructure and properties of VKM25 cermet material]. Perspektivnye Materialy — Advanced Materials (in Russ), 2019, no. 12, p. 20 – 30. DOI: 10.30791/1028-978X-2019-12-20-30

 
Effect of photon treatment on structure and substructure
of Bi2Te3 – хSeх thermoelectric material

E. K. Belonogov, A. A. Grebennikov, V. A. Dybov,
A. V. Kostyuchenko, S. B. Kushchev, I. A. Safonov,
D. V. Serikov, V. A. Yuryev

X-Ray diffractometry, scanning electron microscopy and transmission electron microscopy techniques were used to study the phase composition, morphology as well as structure and substructure of semiconductor plates based on Bi2Te3 – xSex before and after photon treatment (PT) by radiation of high-power xenon lamps (spectral range l = 0.2 – 1.2 µm) in the Ar atmosphere. It was found that the PT results in recrystallization of the near-surface layers (~ 2 µm) of the Bi2Te3 – xSex solid solution with the formation of inhomogeneous structure in the form of microcrystals surrounded by nanocrystalline grains. It also changes the chemical composition of the near-surface layer (~ 5 µm) associated with an increase in the concentration of selenium. More than 40-fold increase in the area of intergrain boundaries and the formation of nanocontacts along the boundaries of the microcrystalline phase make a significant contribution to the scattering of phonons, and a change in the concentration of tellurium and selenium leads to a decrease in the electronic component of thermal conductivity. Substructural changes correlate with a significant (up to 5 %) reduction in the thermal conductivity of samples of Bi2Te3 – xSeh solid solution with a surface layer modified as a result of PT.

 

Keywords: bismuth telluride, photon treatment, surface modification, phase composition, substructure.

DOI: 10.30791/1028-978X-2019-12-31-38

Belonogov Evgeny — Voronezh State Technical University (14, Moskovsky prospect, 394026 Voronezh, Russia), Dr Sci (Phys-Math), professor, specialist in thin films synthesis and structure, gradient nano- and microstructures. E-mail: ekbelonogov@mail.ru.

Grebennikov Anton — Voronezh State Technical University (14, Moskovsky prospect, 394026 Voronezh, Russia), PhD (Phys-Math), head of the laboratory, specialist in the field of thermoelectric properties of semiconductors. E-mail: anton18885@yandex.ru.

 

Dybov Vladislav — Voronezh State Technical University (14 Moskovsky prospect, 394026 Voronezh, Russia), specialist in the field of microstructure, substructure, phase composition of thin films. E-mail: dybovvlad@gmail.com.

Kostyuchenko Alexander — Voronezh State Technical University (14 Moskovsky prospect, 394026 Voronezh, Russia), PhD (Phys-Math), head of department, specialist in the field of microstructure, substructure, phase composition of thin films. E-mail: av-kostuchenko@mail.ru.

Kuschev Sergey — Voronezh State Technical University (14, Moskovsky prospect, 394026 Voronezh, Russia), Dr Sci (Phys-Math), professor, specialist in the pulsed photon treatment and synthesis of silicides, metal oxide carbides.

Safonov Igor — Military Educational and Scientific Center of the Air Force “N.E. Zhukovsky and Y.A. Gagarin Air Force Academy” (54A Starykh Bolshevikov st., 394064 Voronezh, Russia), PhD (Phys-Math), associate professor, specialist in electrical properties of superconductors and semiconductors. E-mail: igorsaf@mail.ru.

 

Serikov Dmitry — Voronezh State Technical University (14 Moskovsky prospect, 394026 Voronezh, Russia), specialist in the field of pulsed photon treatment of the amorphous and nanocrystalline materials. E-mail: dmitriy.tut@mail.ru.

 

Yuryev Vladislav — Voronezh State Technical University (14 Moskovsky prospect, 394026 Voronezh, Russia), specialist in the synthesis of metal tellurides. E-mail: vladislav-al1003@rambler.ru.

Reference citing

Belonogov E. K., Grebennikov A. A., Dybov V. A., Kostyuchenko A. V., Kushchev S. B., Safonov I. A., Serikov D. V., Yuryev V. A. Vliyanie fotonnoj obrabotki na strukturu i substrukturu termoelektricheskogo materiala Bi2Te3 – hSekh [Effect of photon treatment on structure and substructure of Bi2Te3 – хSeх thermoelectric material]. Perspektivnye Materialy — Advanced Materials (in Russ), 2019, no. 12, p. 31 – 38. DOI: 10.30791/1028-978X-2019-12-31-38

 
Study of microscopic causes of radiation hardening of ferritic-martensitic steels RUSFER-EK-181 and ChS-139 in simulation experiment with heavy ion irradiation
 
S. V. Rogozhkin, N. A. Iskandarov, A. A. Nikitin, A. A. Khomich,
V. V. Khoroshilov, A. A. Bogachev, A. A. Lukyanchuk,
O. A. Raznitsyn, A. S. Shutov, T. V. Kulevoy, P. A. Fedin,
A. L. Vasiliev, M. Yu. Presnyakov, M. V. Leontyeva-Smirnova,
E. M. Mozhanov, A. A. Nikitina

 

This study is devoted to comprehensive analysis of nanoscale processes of radiation hardening of ferritic-martensitic steels using heavy ion irradiation at temperatures of 250 – 400 °С to damage doses of ~ 6 dpa. Quantitative analysis of radiation induced microstructure changes of Russian ferritic-martensitic steels RUSFER-EK-181 and ChS-139 by transmission electron microscopy and atom probe tomography was performed. The study of hardening of the steel samples irradiated with ions by nanoindentation and the assessment of hardening within the framework of the dispersed barrier model showed that observed radiation-induced clusters and dislocation loops played significant role in the low-temperature radiation hardening of the RUSFER-EK-181 and ChS-139 steels.

Keywords: ferritic-martensitic steel, ion irradiation, simulation, radiation damage, hardening, nanoindentation.

DOI: 10.30791/1028-978X-2019-12-39-51

Rogozhkin Sergey — Institute for Theoretical and Experimental Physics named by
A.I. Alikhanov of National Research Centre “Kurchatov Institute” (Moscow, 117218, Bol’shaya Cheremushkinskaya st., 25), head of department, National Research Nuclear University MEPhI (Moscow Engineering Physics Institute) ( Moscow, 115409, Kashirskoe shosse, 31), professor, Dr Sci (Phys-Math), specialist in condensed matter physics.
E-mail: sergey.rogozhkin@itep.ru, SVRogozhkin@mephi.ru.

 

Iskandarov Nasib Amirkhan-ogly — Institute for Theoretical and Experimental Physics named by A.I. Alikhanov of National Research Centre “Kurchatov Institute” (Moscow, 117218, Bol’shaya Cheremushkinskaya st., 25), researcher, specialist in ultramicroscopy. E-mail: Iskandarov@itep.ru.

Nikitin Aleksandr — Institute for Theoretical and Experimental Physics named by
A.I. Alikhanov of National Research Centre “Kurchatov Institute” (Moscow, 117218, Bol’shaya Cheremushkinskaya st., 25), PhD (Phys-Math), senior researcher, specialist in ultramicroscopy and materials science. E-mail: aleksandr.nikitin@gmail.com.

Khomich Artem — Institute for Theoretical and Experimental Physics named by
A.I. Alikhanov of National Research Centre “Kurchatov Institute” (Moscow, 117218, Bol’shaya Cheremushkinskaya st., 25), engineer, specialist in atom probe tomography. E-mail: artem.khomich@gmail.com.

Khoroshilov Vasily — Institute for Theoretical and Experimental Physics named by
A.I. Alikhanov of National Research Centre “Kurchatov Institute” (Moscow, 117218, Bol’shaya Cheremushkinskaya st., 25), engineer, specialist in scanning electron microscopy. E-mail: vkhoroshilov@gmail.com.

Bogachev Aleksei — Institute for Theoretical and Experimental Physics named by
A.I. Alikhanov of National Research Centre “Kurchatov Institute” (Moscow, 117218, Bol’shaya Cheremushkinskaya st., 25), researcher, specialist in transmission electron microscopy. E-mail: bogachev@itep.ru.

Lukyanchuk Anton — Institute for Theoretical and Experimental Physics named by
A.I. Alikhanov of National Research Centre “Kurchatov Institute” (Moscow, 117218, Bol’shaya Cheremushkinskaya st., 25), researcher, specialist in atom probe tomography. E-mail: Anton.Lukyanchuk@itep.ru.

Raznitsyn Oleg — Institute for Theoretical and Experimental Physics named by
A.I. Alikhanov of National Research Centre “Kurchatov Institute” (Moscow, 117218, Bol’shaya Cheremushkinskaya st., 25), researcher, specialist in atom probe tomography. E-mail: Oleg.Raznitsyn@itep.ru.

Shutov Anton — Institute for Theoretical and Experimental Physics named by
A.I. Alikhanov of National Research Centre “Kurchatov Institute” (Moscow, 117218, Bol’shaya Cheremushkinskaya st., 25), engineer, specialist in atom probe tomography. E-mail: Anton.Shutov@itep.ru.

Kulevoy Timur — Institute for Theoretical and Experimental Physics named by
A.I. Alikhanov of National Research Centre “Kurchatov Institute” (Moscow, 117218, Bol’shaya Cheremushkinskaya st., 25), PhD (Phys-Math), Deputy director for science at accelerator department, specialist in particle accelerator physics. E-mail: kulevoy@itep.ru.

Fedin Petr — Institute for Theoretical and Experimental Physics named by
A.I. Alikhanov of National Research Centre “Kurchatov Institute” (Moscow, 117218, Bol’shaya Cheremushkinskaya st., 25), engineer, specialist in the field of accelerator physics. E-mail: Fedin-Petr1991@yandex.ru.

Vasiliev Alexander — National Research Centre “Kurchatov Institute” (123098 Russia, Moscow, Akademik Kurchatov sq., 1), PhD (Phys-Math), head of electron microscopy laboratory, specialist in electron microscopy. E-mail: a.vasiliev56@gmail.com.

 

Presnyakov Mikhail — National Research Centre “Kurchatov Institute” (123098 Russia, Moscow, Akademika Kurchatov sq., 1), PhD (Eng), head of PEM RC, specialist in electron microscopy. E-mail: mpresniakov@gmail.com.

Leontyeva-Smirnova Mariya — A.A. Bochvar High-technology Research Institute of Inorganic Materials (Moscow, 123098, Rogova st., 5a), PhD (Eng), head of department, specialist in materials science, radiation physics of metals and alloys. E-mail: MVLeontyeva-Smirnova@bochvar.ru.

Mozhanov Yevgeny — A.A. Bochvar High-technology Research Institute of Inorganic Materials (Moscow, 123098, Rogova st., 5a), senior researcher, specialist in materials science, radiation damage physics of metals and alloys. E-mail: EMMozhanov@bochvar.ru.

Nikitina Anastasiya — A.A. Bochvar High-technology Research Institute of Inorganic Materials (Moscow, 123098, Rogova st., 5a), leading expert, specialist in materials science, radiation physics of metals and alloys. E-mail: AANikitina@bochvar.ru.

Reference citing

Rogozhkin S. V., Iskandarov N. A., Nikitin A. A., Khomich A. A., Khoroshilov V. V., Bogachev A. A., Lukyanchuk A. A., Raznitsyn O. A., Shutov A. S., Kulevoy T. V., Fedin P. A., Vasiliev A. L., Presnyakov M. Yu., Leontyeva-Smirnova M. V., Mozhanov E. M., Nikitina A. A. Issledovanie mikroskopicheskih prichin radiacionnogo uprochneniya stalej EK-181 i CHS-139 s pomoshch'yu imitacionnogo oblucheniya ionami [Study of microscopic causes of radiation hardening of ferritic-martensitic steels RUSFER-EK-181 and ChS-139 in simulation experiment with heavy ion irradiation]. Perspektivnye Materialy — Advanced Materials (in Russ), 2019, no. 12, p. 39 – 51. DOI: 10.30791/1028-978X-2019-12-39-51

 
Reaction sintering of bioceramic, based on substituted calcium phosphates CaMPO4 (M = K, Na)
 
N. K. Orlov, A. K. Kiseleva, P. A. Milkin,
P. V. Evdokimov, V. I. Putlyaev

 

The synthesis of double phosphates, based on calcium and alkali metals, from the different two-phase mixtures, was studied. Phase relationships in CaO – K2O – P2O5 and CaO – Na2O – P2O5 system were clarified, especially phase transition temperature in potassium rhenanite CaKPO4. It was shown that some compounds, that are mentioned in the literature, in particular, CaK2P2O7, CaNa2P2O7, CaK4(PO4)2, CaNa4(PO4)2, cannot be obtained at 1000 – 1200 °C at normal pressure. The compaction and recrystallization were investigated during the reaction sintering of selected two-phase mixtures. Reaction sintering of a mixture of Ca3(PO4)2 and CaK4(PO4)2 gives CaKРO4 ceramics with a density of 78 % (linear shrinkage of the sample is 5 %); when sintering a mixture of K2CO3 and Ca2P2O7, the density of ceramics was 62 % with a linear shrinkage of 15 %. The reaction sintering of sodium-containing mixtures made it possible to obtain dense ceramics (density above 90%, linear shrinkage more than 6.5 %) from a mixture of CaNa4(PO4)2 and Ca3(PO4)2. The experimental features of the reaction sintering of calcium and potassium / sodium double phosphates are discussed from the point of view of volume change during the course of the reaction. Another aspect that determines the density and microstructure of ceramics is the phase transformation of α↔β in alkali metal renanites CаMPO4.

 

Keywords: reaction sintering, calcium and alkali metals double phosphates, rhenanites, bioceramic, phase diagrams.

DOI: 10.30791/1028-978X-2019-12-52-63

Orlov Nikolai — Lomonosov Moscow State University (119191, Moscow, Leninskiye Gory 1, bld. 3), post graduate student, specialist in the field of material science. E-mail: nicolasorlov174@gmail.com.

Kiseleva Anna — Lomonosov Moscow State University (119191, Moscow, Leninskiye Gory 1, bld. 3), bachelor student, specialist in the field of material science. E-mail:
anyatca@yandex.ru.

Milkin Pavel — Lomonosov Moscow State University (119191, Moscow, Leninskiye Gory 1, bld. 3), master student, specialist in the field of material science. E-mail:
volandmilkin@gmail.com.

Evdokimov Pavel — Lomonosov Moscow State University (119191, Moscow, Leninskiye Gory  1, bld. 3), PhD (Chem.), assistant professor, specialist in the field of material science. E-mail: pavel.evdokimov@gmail.com.

Putlayev Valery — Lomonosov Moscow State University (119191, Moscow, Leninskiye Gory 1, bld. 3), PhD (Chem.), associated professor, specialist in the field of material science. E-mail: valery.putlayev@gmail.com.

Reference citing

Orlov N. K., Kiseleva A. K., Milkin P. A., Evdokimov P. V., Putlyaev V. I. Reakcionnoe spekanie biokeramiki na osnove zameshchennyh fosfatov kal'ciya CaMPO4 (M = Na, K) [Reaction sintering of bioceramic, based on substituted calcium phosphates CaMPO4 (M = K, Na)]. Perspektivnye Materialy — Advanced Materials (in Russ), 2019, no. 12, p. 52 – 63. DOI: 10.30791/1028-978X-2019-12-52-63

 
Preparation of silicon nitride and oxonitride by gas-phase pyrolysis of hexamethyldisilazane

N. A. Ovsyannikov, Yu. F. Kargin, A. S. Lysenkov, N. A. Alad’ev,
S. N. Ivicheva, K. A. Solntsev

The technique was developed, the installation was made and the conditions for the production of Si3N4 and Si2N2O by the method of gas-phase pyrolysis of hexamethyldisilazane (CH3)3-Si-NH-Si-(CH3)3 (HMDS) have been experimentally studied. In the experiments, two different methods of inputting the raw material were used — the input of a vapor-gas mixture (bubbling feeder with heating to supply the HMDS vapor in a stream of carrier gases) and input as a gas-droplet stream (pneumatic nozzle). The effect of gas-dynamic synthesis conditions at temperatures up to 1100 °C on the properties of silicon oxonitride and silicon nitride nanopowders was studied. The influence of the conditions of mixing the reactants, the volume ratio of nitrogen/ammonia and the content of HMDS in the vapor-gas mixture on the yield of products is shown. The dependences of the degree of conversion of the feedstock on the gas flow rate and the concentration of ammonia in the gas phase are obtained. The optimal conditions for the pyrolysis process are found: temperature, the ratio of the components of the gas mixture, the conditions of mixing and the contact times of the phases. X-ray amorphous Si3N4 and Si2N2O powders with particle sizes of 50 – 200 nm and a specific surface area of up to 15 m2/g and powders of alpha modification of silicon nitride Si3N4 in the form of threadlike crystals with a particle diameter of 50 – 200 nm were obtained.

Keywords: silicon nitride, silicon oxonitride, pyrolysis, hexamethyldisilazane.

 

DOI: 10.30791/1028-978X-2019-12-64-73

Ovsyannikov Nikolai — Baikov Institute of Metallurgy and Materials Science of the Russian Academy of Sciences (Moscow, 119334, Leninsky Prospect, 49), PhD (Chem), senior researcher, specialist in the field of plasma-chemical processes and devices. E-mail: nikovs@mail.ru.

Kargin Yuri — Baikov Institute of Metallurgy and Materials Science of the Russian Academy of Sciences (Moscow, 119334, Leninsky Prospect, 49), Dr Sci (Chem), chief researcher, specialist in the field of physical and chemical analysis. E-mail: yukargin@imet.ac.ru.

Lysenkov Anton — Baikov Institute of Metallurgy and Materials Science of the Russian Academy of Sciences (Moscow, 119334, Leninsky Prospect, 49), PhD, senior researcher, specialist in the field of ceramic materials. E-mail: toxa55@bk.ru.

Alad’ev Nikolai — Baikov Institute of Metallurgy and Materials Science of the Russian Academy of Sciences (Moscow, 119334, Leninsky Prospect, 49), PhD (Eng), leading researcher, specialist in electron microscopy.

Ivicheva Svetlana — Baikov Institute of Metallurgy and Materials Science of the Russian Academy of Sciences (Moscow, 119334, Leninsky Prospect, 49), PhD, leading researcher, specialist in the field of nanocomposites. E-mail:ivitcheva@mail.ru.

Solntsev Konstantin — Baikov Institute of Metallurgy and Materials Science of the Russian Academy of Sciences (Moscow, 119334, Leninsky Prospect, 49), Dr Sci (Chem), academician of RAS, scientific supervisor of the Institute, specialist in the field of chemistry and technology of ceramic materials. E-mail: solntsev@pran.ru.

Reference citing

Ovsyannikov N. A., Kargin Yu. F., Lysenkov A. S., Alad’ev N. A., Ivicheva S. N., Solntsev K. A. Poluchenie nitrida i oksonitrida kremniya gazofaznym pirolizom geksametildisilazana [Preparation of silicon nitride and oxonitride by gas-phase pyrolysis of hexamethyldisilazane]. Perspektivnye Materialy — Advanced Materials (in Russ), 2019, no. 12, p. 64 – 73. DOI: 10.30791/1028-978X-2019-12-64-73

 
Synthesis of arc-resistant W70Cu30 composite alloy
with frameless placing of thin-dispersed tungsten phase

L. E. Bodrova, S. Yu. Melchakov, E. Yu. Goyda, A. B. Shubin

Prototypes of high-current electrical contacts W70Cu30 with a frameless packing of dispersed W particles were obtained using precrystallization low-frequency vibration of the compositions “copper melt – uncompacted powder W”. Samples were tested for arc resistance in air in a laboratory device that simulates the operation of an AC contactor. Analysis of the structure (before and after 10,000 arc discharge times) and functional properties (transitional contact resistance and hardness) of the obtained alloys in comparison with industrial contacts W70D30-MP was carried out. It is shown that the difference in the structures of the initial alloys is in the nature of the distribution and size of inclusions of tungsten phase. In industrial alloy, tungsten forms a continuous framework of large monolithic formations oriented parallel to the working surface. Their thickness is in the range of 10 – 100  µm, and length reaches 500 µm. In the experimental alloy, the tungsten phase is represented by dispersed particles of 1 – 3 μm, separated by copper. After repeated arc discharges, these microparticles do not cure and do not form a continuous frame even in the uppermost working layers of the contacts. In the industrial alloy, under the action of the arc, both the dispersion of the framework into individual large particles of tungsten (up to 60 μm) and their subsequent merger occur simultaneously, which leads to an increase in the relief of the working surface. The values of transitional contact resistance up to 6000 arc discharge times in both alloys have similar extents. After then there is a tendency to a more intensive increase in transition resistance in the industrial alloy. Despite the fact that the hardness of the frameless alloy is lower than that of industrial, its undoubted advantages are in dispersion and dimensional stability of tungsten inclusions hardening copper under the action of high temperatures (in the arc plasma).

 

Keywords: W – Cu composite alloy, liquid-phase infiltration, low-frequency vibration of the melt, frameless structure, hardness, arc resistance, transitional contact resistance.

 

DOI: 10.30791/1028-978X-2019-12-74-85

Bodrova Lyudmila — Institute of Metallurgy of Ural Branch of RAS (620016, Yekaterinburg, Amundsen st., 101), PhD (Chem.), senior researcher, specialist in the field of development and research of structure and properties of composite materials. E-mail: bоdrova-le@mail.ru.

Melchakov Stanislav — Institute of Metallurgy of Ural Branch of RAS (620016, Yekaterinburg, Amundsen st., 101), PhD (Chem.), senior researcher, specialist in the field of thermochemistry and physical chemistry of metal and salt melts, operator of scanning electron microscope. E-mail: s.yu.melchakov@gmail.com.

 

Goyda Eduard — Institute of metallurgy of Ural Branch of RAS (620016, Yekaterinburg,
Amundsen st., 101), PhD (Chem.), researcher, specialist in the field of development and research of structure and properties of composite materials.
E-mail: eddy-g0d@yandex.ru.

Shubin Alexey — Institute of Metallurgy of Ural Branch of RAS (620016, Yekaterinburg,
Amundsen st., 101), Dr Sci (Chem.), head of laboratory of physical chemistry of metallurgical melts, specialist in the field of physical chemistry of metallic and ionic melts. E-mail: fortran@list.ru.

Reference citing

Bodrova L. E., Melchakov S. Yu., Goyda E. Yu., Shubin A. B. Sintez dugostojkih kompozitov W70Cu30 s beskarkasnoj upakovkoj tonkodispersnoj vol'framovoj fazy [Synthesis of arc-resistant W70Cu30 composite alloy with frameless placing of thin-dispersed tungsten phase]. Perspektivnye Materialy — Advanced Materials (in Russ), 2019, no. 12, p. 74 – 85. DOI: 10.30791/1028-978X-2019-12-74-85