PERSPEKTIVNYE MATERIALY
2020, №08
Nanostructured MoS3/WSe2 thin-film photocathode for efficient water splitting under light illumination
V. N. Nevolin, R. I. Romanov, D. V. Fominski, O. V. Rubinkovskaya,
A. A. Soloviev, V. Yu. Fominski
The influence of the chemical state of the WOу thin-film precursor on the formation of WSe2nanofilms under rapid selenization on a glassy-carbon substrate at 900°C was studied. Amorphous molybdenum sulfide (MoSx~3), which has high catalytic activity in the electrochemical hydrogen evolution reaction, was prepared on the surface of the WSe2 films by pulsed laser deposition. It was shown that the composition of the WOу precursors had a significant effect on the morphology of WSe2 nanolayers, and this characteristic largely determined the efficiency of hydrogen evolution by the MoS3/WSe2heterostructure upon photo-activated water splitting. The most efficient hydrogen evolution was found for the MoS3/WSe2photocathode that contained WSe2 in the form of petal crystals of ~ 50 nm thickness and these petals were oriented perpendicular to the substrate surface. A theoretical analysis of the possible effect of synergetic interaction at the MoS3/WSe2 interface on the efficiency of hydrogen formation was carried out. Calculations using the density functional theory showed that MoS3 clusters can increase the efficiency of the hydrogen evolution reaction in contact with surface areas of WSe2 nanocrystals possessing different atomic packing.
Keywords: photo-activated water splitting, hydrogen evolution, nanocatalyst, MoS3, WSe2, synergistic effect.
DOI: 10.30791/1028-978X-2020-8-5-18
Nevolin Vladimir — National Research Nuclear University MEPhI (Moscow Engineering Physics Institute, Kashirskoe sh., 31, Moscow 115409, Russia), Dr Sci (Phys-Math), professor of the department of solid state physics and nanosystems, specialist in the physics of thin films and nanostructures. E-mail: nevolin@sci.lebedev.ru.
Romanov Roman — National Research Nuclear University MEPhI (Moscow Engineering Physics Institute, Kashirskoe sh., 31, Moscow 115409, Russia), PhD, researcher of the department of solid state physics and nanosystems, specialist in the field of physical and chemical methods for preparation and study of thin-film structures for various applications. E-mail: limpo2003@mail.ru.
Fominski Dmitry — National Research Nuclear University MEPhI (Moscow Engineering Physics Institute, Kashirskoe sh., 31, Moscow 115409, Russia), engineer of the department of solid state physics and nanosystems, specialist in the field of pulsed laser deposition of thin films and nanostructures. E-mail: dmitryfominski@gmail.com.
Rubinkovskaya Oksana — National Research Nuclear University MEPhI (Moscow Engineering Physics Institute, Kashirskoe sh., 31, Moscow 115409, Russia), PhD student of the department of solid state physics and nanosystems, specialist in the field of production and study of semiconductor catalysts based on transition metal chalcogenides. E-mail: oxygenofunt@gmail.com.
Soloviev Alexey — National Research Nuclear University MEPhI (Moscow Engineering Physics Institute, Kashirskoe sh., 31, Moscow 115409, Russia), PhD student of the department of solid state physics and nanosystem, specialist in the field of formation and research of thin-film nanomaterials for sensory and catalysis. E-mail: ale7@inbox.lv.
Fominski Vyacheslav — National Research Nuclear University MEPhI (Moscow Engineering Physics Institute, Kashirskoe sh., 31, Moscow 115409, Russia), Dr Sci (Phys-Math), professor, chief researcher of the department of solid state physics and nanosystems, specialist in the physics of thin films, nanostructures and beam surface modification technologies. E-mail: vyfominskij@mephi.ru.
Reference citing:
Nevolin V.N., Romanov R.I., Fominski D.V., Rubinkovskaya O.V., Soloviev A.A., Fominski V.Yu. Nanostrukturirovannyj tonkoplenochnyj fotokatod MoS3/WSe2 dlya effektivnogo rasshchepleniya vody pod svetovym potokom [Nanostructured MoS3/WSe2 thin-film photocathode for efficient water splitting under light illumination]. Perspektivnye Materialy — Advanced Materials (in Russ), 2020, no. 8, pp. 5 – 18. DOI: 10.30791/1028-978X-2020-8-5-18
Technological aspects of production of thin sheets for aircraft construction based on Al – Mg – Sc alloys
N. V. Eremeev, P. Yu. Predko, V. V. Eremeev, A. V. Bespalov, S. G. Bochvar
Review of the possibility of replacing thin sheets (0.5 mm) of alloy 2024 with sheets of a new alloy of the Al – Mg – Sc system alloyed with transition metals. New material is lighter than 2024 but save high-level properties such as corrosion strait, satisfactory weldability, static strength, ductility and crack resistance. Review of the possibility that in the case of using extrusion technologies through the matrix with a periodically changing profile. The coefficient of accumulated deformation is increased by almost 2 times compared with extrusion through a cone matrix. This allows to improve the developed structures with the same drawing coefficients equal to 4. It was shown that mixed structure with small-angle dislocation subgrain boundaries and strongly misoriented boundaries of fragmented structures forms in sheets with a thickness of 0.5 mm.
Keywords: aluminum, scandium, transition metals, laminates, aircraft fuselage, casting, extrusion, rolling.
DOI: 10.30791/1028-978X-2020-8-19-28
Eremeev Nikolay — Moscow Aviation Institute (National Research University), (125993 Moscow, Volokolamskoe shosse, 4), PhD, associate professor, specialist of metal forming processes. E-mail: labomd@mail.ru.
Predko Pavel — OJSC All-Russian Institute of Light Alloys (121596, Russia, Moscow, Gorbunva st. 2), leading process engineer, specialist in welding and casting of aluminum and magnesium alloys. E-mail: predko626@gmail.com.
Eremeev Vladimir — Moscow Aviation Institute (National Research University), (125993 Moscow, Volokolamskoe shosse, 4), PhD, associate professor, specialist of metal forming processes E-mail: labomd@mail.ru.
Bespalov Alexandr — Moscow Aviation Institute (National Research University), (125993 Moscow, Volokolamskoe shosse, 4), PhD, associate professor, specialist of metal forming processes E-mail: bespalovav@mati.ru.
Bochvar Sergey — Baikov Institute of Metallurgy and Materials Science, RAS (Leninskij pr. 49, Moscow, Russia, 119334), Dr Sci (Eng), leading researcher, specialist in materials science of aluminum alloys. E-mail: sbochvar@imet.ac.ru.
Reference citing:
Eremeev N.V., Predko P.Yu., Eremeev V.V., Bespalov A.V., Bochvar S.G. Tekhnologicheskie aspekty proizvodstva tonkih listov dlya aviastroeniya na osnove splavov sistemy Al – Mg – Sc [Technological aspects of production of thin sheets for aircraft construction based on Al – Mg – Sc alloys]. Perspektivnye Materialy — Advanced Materials (in Russ), 2020, no. 8, pp. 19 – 28. DOI: 10.30791/1028-978X-2020-8-19-28
Influence of manganese ions environment in octahedral sublattice of La0.7Sr0.3Mn0.9Fe0.1 – xMgxO3 + g manganites on their properties
V. K. Karpasyuk, A. G. Badelin, Z. R. Datskaya, R. M. Eremina, D. I. Merkulov,
S. Kh. Estemirova, M. A. Aljanov, Z. Y. Seidov
Structural, magnetic, and electrical characteristics of manganites in the system La3+0.7Sr2+0.3Mn3+0.6–x-2gMn4+0.3+x+2gFe3+0.1–x Mg2+xO2-3+g (0 < x < 0.1) synthesized by solid-state reactions are presented. Sintering was performed in air at 1423 K. Samples with stoichiometric oxygen content (g = 0) were obtained by annealing at 1223 K and a partial oxygen pressure of 0.1 Pa. All studied manganites have a rhombohedral structure. With an increase in the magnesium content, the volume of the unit cell decreases, and annealed samples have a larger cell volume than the initial, sintered manganites containing over-stoichiometric oxygen. The ratio c/a of lattice parameters is practically unchanged. Curie point of manganites decreases in general with an increase in the magnesium content, showing a weakly expressed plateau in the region of 0.025 < x < 0.075. Magnetization and “metal-semiconductor” transition temperature have maximum values at x = 0, then change non-monotonically, and at x > 0.075 fall sharply. Manganite, which contains the largest amount of magnesium, has the highest resistance at temperatures below 180 K and is characterized by the largest width of the temperature interval of “ferromagnetic-paramagnetic” transition, which indicates the existence of magnetic inhomogeneities. The electromagnetic parameters of the initial and annealed samples differ slightly. A number of effects and competing factors that determine complicated dependencies of electromagnetic characteristics of the manganites of this system on the composition are considered.
Keywords:manganites, magnesium, iron, unit cell, magnetization, Curie point, metal-semiconductor transition, inhomogeneities.
DOI: 10.30791/1028-978X-2020-8-29-38
Karpasyuk Vladimir — Astrakhan State University (20a Tatishchev Str., Astrakhan, 414056, Russia), Dr. Sci. (Phys-Math), professor, director and scientific head of the Research and educational center for functional magnetic materials, specialist in the field of the physics of magnetic materials, semiconductors and dielectrics. E-mail: vkarpasyuk@mail.ru
Badelin Alexey — Astrakhan State University (20a Tatishchev Str., Astrakhan, 414056, Russia), PhD (Phys-Math), senior researcher, specialist in the condensed matter physics and ceramic processing. E-mail: alexey_badelin@mail.ru.
Datskaya Zamira — Astrakhan State University (20a Tatishchev Str., Astrakhan, 414056, Russia), PhD (Phys-Math), associate professor, specialist in the field of materials science and condensed matter physics. E-mail: mira-phys@mail.ru.
Eremina Rushana — The Kazan E.K. Zavoisky Physical-Technical Institute (10/7 Sibirsky tract Str., Kazan, 420029, Russia), Dr Sci (Phys-Math), leading researcher, specialist in the field of magnetism and lattice dynamics in crystals and disordered systems. E-mail:
reremina@yandex.ru.
Merkulov Denis — Astrakhan State University (20a Tatishchev Str., Astrakhan, 414056, Russia), PhD (Phys-Math), head of laboratory, specialist in the field of condensed matter physics, materials science for semiconductors and dielectrics. E-mail: merkul_d@mail.ru.
Estemirova Svetlana — Institute of metallurgy, Ural Division of RAS (101 Amundsen st., Ekaterinburg, 620016, Russia), PhD (Chem), senior researcher, specialist in condensed matter chemistry and X-ray structural analysis. E-mail: esveta100@mail.ru.
Aljanov Mezahir Amirjan oglu— Institute of Physics, National Azerbaijan Academy of Sciences (131 Н. Javid ave., Baku, AZ1143, Azerbaijan), Dr Sci (Phys-Math), head of department, specialist in the field of heat capacity and phase transitions in low-dimensional crystals and solid solutions based on them. E-mail: mezahir2002@mail.ru.
Seidov Zakir Yuhannas oglu — Institute of Physics, National Azerbaijan Academy of Sciences (131 Н. Javid ave., Baku, AZ1143, Azerbaijan), Dr Sci (Phys-Math), leading researcher, specialist in the field of physics of magnetic phenomena and solid state physics. E-mail: zsyu@rambler.ru.
Reference citing:
Karpasyuk V.K., Badelin A.G., Datskaya Z.R., Eremina R.M., Merkulov D.I., Estemirova S.Kh., Aljanov M.A., Seidov Z.Y. Vliyanie okruzheniya ionov marganca v oktaedricheskoj podreshetke manganitov La0,7Sr0,3Mn0,9Fe0,1 – xMgxO3 + g na ih svojstva [Influence of manganese ions environment in octahedral sublattice of La0.7Sr0.3Mn0.9Fe0.1 – xMgxO3 + g manganites on their properties]. Perspektivnye Materialy — Advanced Materials (in Russ), 2020, no. 8, pp. 29 – 38. DOI: 10.30791/1028-978X-2020-8-29-38
Structure and properties of compact articles from high-alloyed iron powder with adding of boron nitride
B. O. Bolshakov, R. F. Galiakbarov, A. M. Smyslov
The results of the research of structure and properties of a composite compact from 13 Cr – 2 Мо and BN powders depending on the concentration of boron nitride are provided. It is shown that adding boron nitride in an amount of more than 2% by weight of the charge mixture leads to the formation of extended grain boundary porosity and finely dispersed BN layers in the structure, which provides a high level of wearing properties of the material. The effect of boron nitride concentration on physical and mechanical properties is determined. It was found that the introduction of a small amount of BN (up to 2 % by weight) into the compacts leads to an increase in plasticity, bending strength, and toughness by reducing the friction forces between the metal powder particles during pressing and a more complete grain boundary diffusion process during sintering. The formation of a regulated structure-phase composition of powder compacts of 13 Cr – 2 Mо – BN when the content of boron nitride changes in them allows us to provide the specified physical and mechanical properties in a wide range. The obtained results of studies of the physical and mechanical characteristics of the developed material allow us to reasonably choose the necessary composition of the powder compact for sealing structures of the flow part of steam turbines, depending on their operating conditions.
Keywords: composite compact, steam turbine seals, microstructure, physical and mechanical properties
DOI: 10.30791/1028-978X-2020-8-39-48
Bolshakov Boris — Scientific-Production Enterprise Uralaviaspetstekhnologiya Ltd. (Ufa, 450027, Tramvainayf st., 5, bld. 1), leading research engineer, specialist in the field of cermet seals. E-mail: bobolshakov@gmail.com.
Galiakbarov Ruslan — Scientific-Production Enterprise Uralaviaspetstekhnologiya Ltd. (Ufa, 450027, Tramvainayf st., 5, bld. 1), associate director, specialist in the field of cermet seals. E-mail: grf@mail.com.
Smyslov Anatoly — Ufa State Aviation Technical University (USATU, Ul. K. Marxa 12, Ufa, The Republic of Bashkortostan, Russian Federation, 450008), Dr Sci (Eng), professor, department of Engineering technology, specialist in the field of ion-implantation and vacuum-plasma surface modification, cermet seals. E-mail: smyslovam@yandex.ru.
Reference citing:
Bolshakov B.O., Galiakbarov R.F., Smyslov A.M. Struktura i svojstva kompozicionnyh kompaktov iz vysokolegirovannogo poroshka zheleza s dobavkami nitrida bora [Structure and properties of compact articles from high-alloyed iron powder with adding of boron nitride]. Perspektivnye Materialy — Advanced Materials (in Russ), 2020, no. 8, pp. 39 – 48. DOI: 10.30791/1028-978X-2020-8-39-48
The combined use of synthetic and biological test-systems in the development of transdermal therapeutic systems
E. G. Kuznetsova, O. M. Kuryleva, L. A. Salomatina, V. I. Sevastianov
There are several approaches to modeling percutaneous diffusion of drugs and predicting its effectiveness in the development of new transdermal therapeutic systems (TTS): mathematical models, synthetic and biological test-systems. The aim of the work is to substantiate the need to combined use synthetic and biological test systems at the initial stages of the transdermal therapeutic systems development using the Galavit® immunomodulator TTS as an example. Six batches of laboratory samples of TTS were made with a different composition of excipients in emulsions. Transdermal therapeutic systems formulations were screened on the synthetic test-system represented by Strat-M membrane (Merck Millipore). Based on the results of the study, two formulations with the best data of the drugs amount passed into the receiving chamber of the Franz diffusion cell were selected. Amount of drugs in the form were amounted 30 %. The use of non-preserved rabbit skin was revealed significant differences in this indicator for TTS of these two compositions. The mass of drugs passing through the skin from the TTS Galavit® for 24 hours of application for the first emulsion was 58 – 71 % and was 39 – 50 % for the second. The biological test-system turned out to be more sensitive to the emulsion compositions. Thus, the combined use of synthetic and biological test-systems makes it possible to significantly reduce the complexity and costs of preclinical studies of new TTS.
Keywords: synthetic Strat-M membrane, non-preserved skin, transdermal therapeutic systems, Galavit®, percutaneous diffusion.
DOI: 10.30791/1028-978X-2020-8-49-58
Kuznetsova Eugenia —Academician V.I. Shumakov Federal Research Center of Transplantology and Artificial Organs, Ministry of Health of the Russian Federation. (Moscow, 123182, Schukinskaya street, 1), PhD (Biology), senior scientific researcher, specialist in biomedical technology, drug delivery systems. E-mail: kuzeugenia@gmail.com.
Kuryleva Olga — Academician V.I. Shumakov Federal Research Center of Transplantology and Artificial Organs, Ministry of Health of the Russian Federation. (Moscow, 123182, Schukinskaya street, 1), PhD (Medicine), senior scientific researcher, specialist in biomedical technology, drug delivery systems. E-mail: olga-ms13@yandex.ru.
Salomatina Lidiya — Academician V.I. Shumakov Federal Research Center of Transplantology and Artificial Organs, Ministry of Health of the Russian Federation. (Moscow, 123182, Schukinskaya street, 1), senior scientific researcher, specialist in biotechnology, drug delivery systems. E-mail: liansa@mail.ru.
Sevastianov Viktor — Academician V.I. Shumakov Federal Research Center of Transplantology and Artificial Organs, Ministry of Health of the Russian Federation. (Moscow, 123182, Schukinskaya street, 1), Dr. Sci. (Biology), professor, head of laboratory tissue engineering and delivery systems, specialist in biomaterials, tissue engineering and regenerative medicine, drug delivery systems. E-mail: viksev@yandex.ru.
Reference citing:
Kuznetsova E.G., Kuryleva O.M., Salomatina L.A., Sevastianov V.I. Primenenie sinteticheskoj i biologicheskoj test-sistem pri razrabotke transdermal'nyh terapevticheskih sistem [The combined use of synthetic and biological test-systems in the development of transdermal therapeutic systems]. Perspektivnye Materialy — Advanced Materials (in Russ), 2020, no. 8, pp. 49 – 58. DOI: 10.30791/1028-978X-2020-8-49-58
Preparation and research of antibacterial composite materials based on ABS and oligethylene ether of salicylic acid
N. Sh. Rasulzade, L. Sh. Abbasova, B. A. Mamedov, P. Z. Muradov, K. F. Bakhshalieva
To give antibacterial properties to ABS-based composite materials, oligoethylene ester of salicylic acid in an amount of 0.5 – 1.0 % was used as additive. It was found that additive practically do not affect the physicomechanical properties of composite materials, but lead to a relative improvement in thermophysical parameters and the appearance of antibacterial properties in them. The antibacterial properties were studied and the possibilities of application of the obtained composite materials were determined. Micromycetes such as Aspergillus niger, A.ochraseus, Penicillium cuclopium, Cladosporium herbarium, Fusarium moniliforme and F.oxysporium were used as a test culture. It was found that the studied composite materials have both bactericidal and fungicidal properties. The fungicidal properties of the obtained new antibacterial composite materials allow their use in the manufacture of products resistant to fungal influence.
Keywords:salicylic acid oligoethylene ether, acrylonitrile-butadiene-styrene copolymers, antibacterial polymer additives, composite materials, Aspergillus niger, A.ochraseus, Penicillium cuclopium, Cladosporium herbarium, Fusarium moniliforme and F.oxysporium.
DOI: 10.30791/1028-978X-2020-8-59-64
Rasulzade Niyazi Shahid oglu — Institute of Polymer Materials of the Azerbaijan National Academy of Sciences (AZ 5004, Sumgayit city, Samed Vurgun St., 124), Dr Sci (Chem), professor, Honored worker of science, specialist in the synthesis of macromonomers based on polymeric materials. E-mail: prof.niyazi@mail.ru.
Bakhtiyar Azhdar oglu Mammadov — Institute of Polymer Materials of the Azerbaijan National Academy of Sciences (AZ 5004, Sumgayit city, Samed Vurgun St., 124), Dr Sci (Chem), professor, corresponding member of the Azerbaijan national academy of sciences, director, specialist in macromolecular compounds. E-mail: bazisaley@mail.ru.
Abbasova Leila Shahib — Institute of Polymer Materials of the Azerbaijan National Academy of Sciences (AZ 5004, Sumgayit city, Samed Vurgun St., 124), researcher, graduate student. E-mail: leyla-abbasova-1982@mail.ru.
Muradov Panah Zulfugar oglu —Institute of Microbiology of the Azerbaijan National Academy of Sciences (AZ1073, Republic of Azerbaijan, Baku, Mikail Mushfig, 103), Dr Sci (Biolog), professor, corresponding member of the National academy of sciences of Azerbaijan, deputy director, specialist in the area of microbiology. E-mail: mpanah@mail.ru.
Bakhshaliev Konul Farrukh qizi —Institute of Microbiology of the Azerbaijan National Academy of Sciences (AZ1073, Republic of Azerbaijan, Baku, Mikail Mushfig 103), Dr Sci (Biolog), professor, specialist in the area of microbiology. E-mail: konul.baxsh@mail.ru.
Reference citing:
Rasulzade N.Sh., Abbasova L.Sh., Mamedov B.A., Muradov P.Z., Bakhshalieva K.F. Poluchenie i issledovanie antibakterial'nyh kompozicionnyh materialov na osnove ABS i oligoetilenovogo efira salicilovoj kisloty [Preparation and research of antibacterial composite materials based on ABS and oligethylene ether of salicylic acid]. Perspektivnye Materialy — Advanced Materials (in Russ), 2020, no. 8, pp. 59 – 64. DOI: 10.30791/1028-978X-2020-8-59-64
Electrophysical properties of composites based on low density polyethylene and zeolite mineral
A. M. Maharramov, V. J. Dzhafarov, M. N. Bayramov, N. Sh. Aliyev,
P. Sh. Alkhanov, G. X. Musaeva
Dielectric parameters (e', tgd) and electrical conductivity (s) of samples composites of 60 vol. % LDPE/40 vol. % zeolite, 40 vol. % LDPE/60 vol. % zeolite was measured at frequencies 25 – 106 Hz and a temperature range 293 – 403 K. Composites based on a homogeneous mixture of LDPE with powdered natural zeolite (clinoptiolite and heilandite — Agdag deposit, Azerbaijan) were obtained in the form of film samples 140 – 200 microns and 20 mm in diameter, by hot pressing at a temperature of 403 – 413 K and a pressure of 15 MPa, followed by quenching in a mixture of ice-water. The temperature dependence of the electrophysical parameters of the samples of the composites revealed that the dielectric loss tgd and electrical conductivity s increase with increasing filler content, and this is due to an increase in the concentration of charge carriers and their mobility. The study of the frequency dependences e' = f(logn), tgd = f(logn) and logs = f(logn) showed the presence of two linear regions of the frequency dependences of the electrical conductivity, which vary according to the law sас(n) ~ n0,73, and this is more consistent with the hopping mechanism of the electrical conductivity of LDPE/zeolite composites.
Keywords:polyethylene, composite, zeolite, the real part of the dielectric constant, conductivity, temperature and frequency dependence, insulation, modification.
DOI: 10.30791/1028-978X-2020-8-65-72
Maharramov Arif Musa — Institute of Radiation Problems of the National Academy of Sciences of Azerbaijan (Baku, Azerbaijan, АZ1143, Vakhabzadeh St., 9), Dr Sci (Phys-Math), professor, head of laboratory, specialist in dielectric and thermal activation spectroscopy, polymer thermoluminescence composition, physical chemistry and radiation materials science. E-mail: arifm50@yandex.ru.
Dzhafarov Valeh Dzabbar oglu —Institute of Polymer Materials of Azerbaijan National Academy of Sciences (Sumgayit city, Azerbaijan, AZ5004, S.Vurgun str.124), corresponding member of ANAS, Dr Sci (Chem), professor, head of laboratory, specialist in the field of chemistry of macromolecules. Е-mail: valeh_ani@mail.ru.
Bayramov Mazagir Nasreddin —Institute of Radiation Problems of the National Academy of Sciences of Azerbaijan (Baku, Azerbaijan, AZ1143, B.Vahabzadeh St.,9), PhD in physics, senior researcher, specialist in the development of composite materials, nanocomposites based on epoxy resins, thermoplastics and magnetic nanofillers, radiothermoluminescence polymer compositions and radiation materials science. E-mail: m.bayramov51@mail.ru.
Аliyev Nabi Shamshad —Institute of Radiation Problems of the National Academy of Sciences of Azerbaijan (Baku, Azerbaijan, AZ1143, B.Vahabzadeh St.,9), PhD in physics, senior researcher, specialist in dielectric and thermal activation spectroscopy, polymer thermoluminescence composition, physical chemistry and radiation materials science. E-mail: nabi.aliyev.1958@mail.ru.
Alkanov Parviz Shakir oglu —Institute of Polymer Materials of Azerbaijan National Academy of Sciences (Sumgayit city, Azerbaijan, AZ5004, S.Vurgun Str.124), postgraduate student on specialty Chemistry of macromolecules. Е-mail: valeh_ani@mail.ru.
Musayeva Gulnara Guseinkhan gizi — Institute of Polymer Materials of Azerbaijan National Academy of Sciences (Sumgayit city, Azerbaijan, AZ5004, S.Vurgun Str.124), engineer, specialist in chemistry of macromolecules. Е-mail: valeh_ani@mail.ru.
Reference citing:
Maharramov A.M., Dzhafarov V.J., Bayramov M.N., Aliyev N.Sh., Alkhanov P.Sh., Musaeva G.X. Elektrofizicheskie svojstva kompozitov na osnove polietilena nizkoj plotnosti i ceolitovogo minerala [Electrophysical properties of composites based on low density polyethylene and zeolite mineral]. Perspektivnye Materialy — Advanced Materials (in Russ), 2020, no. 8, pp. 65 – 72. DOI: 10.30791/1028-978X-2020-8-65-72
Spark plasma sintering of WC – 10 Co nanopowders with various carbon content obtained by plasma-chemical method
Yu. V. Blagoveshchenskiy, N. V. Isaeva, E. A. Lantsev, M. S. Boldin,
V. N. Chuvil’deev, A. V. Nokhrin, A. A. Murashov, P. V. Andreev,
K. E. Smetanina, N. V. Malekhonova, A. V. Terentev
The features of high-speed sintering of WC – Co nanopowders with various contents of excess carbon (colloidal graphite) were studied. To obtain powders, a process was used that included plasma-chemical and low-temperature syntheses and a chemical-metallurgical method of applying ultrathin cobalt layers by precipitation from a solution of salts. The consolidation of powder materials was carried out by the method of high-speed Spark Plasma Sintering. It was found that an increase in the concentration of free carbon (colloidal graphite) has the greatest effect on the shrinkage and sintering rate at the stage of intense shrinkage of WC-Co nanopowders. It is shown that an increase in the carbon content in the composition of nanopowders leads to a decrease in the value of sintering activation energy at the stage of intense shrinkage.It has been established that the process of nanopowder compaction at the intense shrinkage stage is determined by the intensity of the plastic flow and the grain boundary diffusion of cobalt. It is shown that the mechanism of plastic deformation of the g-phase based on cobalt corresponds to the Coble diffusion creep. It was found that an increase in carbon content leads to decreased in activation energy at the intense shrinkage and does not significantly affect at stage III of sintering where decrease in the shrinkage intensity is observed. It was shown that a decrease in the sintering activation energy is due to a decrease in the tungsten concentration in the g-phase.
Keywords: tungsten carbide, nanopowders, plasmochemical synthesis, spark plasma sintering, density.
DOI: 10.30791/1028-978X-2020-8-73-86
Blagoveshchenskiy Yuri — Baikov Institute of Metallurgy and Materials Science of RAS (119334, Moscow, 49 Leninskiy av.), PhD, leading researcher, specialist in plasma processes in metallurgy and metals treatment. E-mail: yuriblag@imet.ac.ru.
Isaeva Nataliya — Baikov Institute of Metallurgy and Materials Science of RAS (119334, Moscow, 49 Leninskiy av.), researcher, specialist in powder metallurgy.
E-mail: felix-2001@mail.ru.
Lantsev Eugeniy — Physical and Technical Research Institute of Lobachevsky State University of Nizhny Novgorod (PTRI UNN, 23/3 Gagarina ave., Nizhny Novgorod, Russia, 603950), PhD student, engineer, specialist in spark plasma sintering. E-mail: elancev@nifti.unn.ru.
Boldin Maksim — Physical and Technical Research Institute of Lobachevsky State University of Nizhny Novgorod (PTRI UNN, 23/3 Gagarina ave., Nizhny Novgorod, Russia, 603950), PhD, researcher, head of the ceramics technology Laboratory, specialist in spark plasma sintering. E-mail: boldin@nifti.unn.ru.
Chuvil’deev Vladimir — Physical and Technical Research Institute of Lobachevsky State University of Nizhny Novgorod (PTRI UNN, 23/3 Gagarina ave., Nizhny Novgorod, Russia, 603950), Dr Sci, professor, director, specialist in diffusion in metals, alloys and ceramics. E-mail: chuvildeev@nifti.unn.ru.
Nokhrin Aleksey — Physical and Technical Research Institute of Lobachevsky State University of Nizhny Novgorod (PTRI UNN, 23/3 Gagarina ave., Nizhny Novgorod, Russia, 603950), Dr Sci, head of materials diagnostics laboratory, specialist in diffusion in metals, alloys and ceramics. E-mail: nokhrin@nifti.unn.ru.
Murashov Artem — Physical and Technical Research Institute of Lobachevsky State University of Nizhny Novgorod (PTRI UNN, 23/3 Gagarina ave., Nizhny Novgorod, Russia, 603950), PhD student, engineer, specialist in electron microscopy. E-mail: aamurashov@nifti.unn.ru.
Andreev Pavel — Physical and Technical Research Institute of Lobachevsky State University of Nizhny Novgorod (PTRI UNN, 23/3 Gagarina ave., Nizhny Novgorod, Russia, 603950), PhD, junior researcher, specialist in XRD analysis. E-mail: andreev@phys.unn.ru.
Smetanina Kseniya — Physical and Technical Research Institute of Lobachevsky State University of Nizhny Novgorod (PTRI UNN, 23/3 Gagarina ave., Nizhny Novgorod, Russia, 603950), MD student, laboratory assistant, specialist in XRD analysis. E-mail: collins_28@mail.ru.
Malekhonova Natalya — Physical and Technical Research Institute of Lobachevsky State University of Nizhny Novgorod (PTRI UNN, 23/3 Gagarina ave., Nizhny Novgorod, Russia, 603950), PhD, junior researcher, specialist in scanning electron microscopy. E-mail: malekhonova.n@gmail.com.
Terentev Alexandr — Baikov Institute of Metallurgy and Materials Science of RAS (119334, Moscow, 49 Leninskiy av.), PhD, engineer, specialist in powder metallurgy. E-mail: terentev.alxndr@yandex.ru.
Reference citing:
Blagoveshchenskiy Yu.V., Isaeva N.V., Lantsev E.A., Boldin M.S., Chuvil’deev V.N., Nokhrin A.V., Murashov A.A., Andreev P.V., Smetanina K.E., Malekhonova N.V., Terentev A.V. Elektroimpul'snoe plazmennoe spekanie nanoporoshkov WC – 10 Co s razlichnym soderzhaniem ugleroda, poluchennyh metodom plazmohimicheskogo sinteza [Spark plasma sintering of WC – 10 Co nanopowders with various carbon content obtained by plasma-chemical method]. Perspektivnye Materialy — Advanced Materials (in Russ), 2020, no. 8, pp. 73 – 86. DOI: 10.30791/1028-978X-2020-8-73-86
