Paramagnetic Meissner effect of the DyRh3.8Ru0.2B4
magnetic superconductor


G. S. Burkhanov, S. A. Lachenkov, E. P. Khlybov


The paramagnetic Meissner effect, previously observed in yttrium and bismuth cuprates, was established by us in DyRh3.8Ru0.2B4 — a single-phase superconductor with its own magnetic subsystem. Measurement of the magnetic moment DyRh3.8Ru0.2B4 is performed in FC and ZFC modes – cooling in a magnetic field and without it, followed by heating already when the magnetic field is turned on. In the study of complex rhodium boride in the FC mode, in the fields of ~ 20 Oe (below the first critical), the occurrence of a positive magnetic moment was established. The appearance of a paramagnetic Meissner effect at DyRh3.8Ru0.2B4 fields B<Bc1 is connected with the peculiarities of behavior of the magnetic subsystem with the cooling of the sample in modes-enabled by a magnetic field (FC) and without (ZFC) at a temperature below the phase transition point from paramagnetic to ferrimagnetic state. The connection of this anomaly with the intrinsic magnetic subsystem of the compound formed by a cluster crystal structure of the LuRu4B4 type is discussed. The influence of the intrinsic magnetic subsystem on increasing the stability of the superconducting state is established. The presence of its own magnetic subsystem distinguishes the studied single-phase rhodium boride from other superconductors of the 2nd kind, which do not have a magnetic subsystem.


Keywords: superconductivity, paramagnetic Meissner effect, magnetic subsystem, the mode of FC, ZFC.


DOI: 10.30791/1028-978X-2020-4-5-10

Burkhanov Gennadyi — Baikov Institute of Metallurgy and Material Science of RAS (49 Leninskii pr., Moscow, 119334, Russia), corresponding member of RAS, head of laboratory Physical chemistry of refractory and rare metals and alloys, specialist in the field of physical chemistry and technology of inorganic materials. E-mail: genburkh@imet.ac.ru.


Lachenkov Sergey — Baikov Institute of Metallurgy and Material Science of RAS (49 Leninskii pr., Moscow, 119334, Russia), PhD, leading research worker, specialist in the field of superconducting materials and metal physics of superconductors. E-mail: lachenck@imet.ac.ru.


Khlybov Evgeniy — Vereshchagin Institute for High Pressure Physics, Russian Academy of Sciences (HPPI RAS, 142190, Troitsk, Moscow, Russia), Dr Sci (Phys-Math), leading researcher, specialist in the field of superconductivity, magnetism and high pressure physics. E-mail: ekhlybov@rambler.ru.

Reference citing

Burkhanov G.S., Lachenkov S.A., Khlybov E.P. Paramagnitnyj effekt Mejsnera u magnitnogo sverhprovodnika Dy Rh3,8Ru0,2B4 [Paramagnetic Meissner effect of the Dy Rh3.8Ru0.2B4 magnetic superconductor]. Perspektivnye Materialy — Advanced Materials (in Russ), 2020, no. 4, p. 5 – 10. DOI: 10.30791/1028-978X-2020-4-5-10

Layered self-healing composite material with an internal functional layer based on borosiloxane


N. N. Sitnikov, I. A. Khabibullina,V. I. Mashchenko,
A. V. Shelyakov, K. S. Mostovaya, E. A. Vysotina


This work is devoted to the study of borosiloxane as a functional layer in multilayer self-healing composites. The provisions and principles of self-healing in artificial materials are considered. It is proved two factors are necessary for rapid self-healing at least: directional mass transfer and self-adhesion of the brought together borders. Such materials can be either liquid media or viscous-fluid materials. Borosiloxane is presented as a promising material as a self-healing viscous matrix in multilayer composites or sandwich panels. The addition of various fillers, for example, fibers, to borosiloxane leads to a decrease in fluidity. While high diffusion of macromolecules is maintained ensuring high self-adhesion due to the low molecular weight. The addition of polyester fibers to borosiloxane lets to effectively control fluidity while maintaining a high diffusion rate and, accordingly, the coalescence rate of the brought together material surfaces. Experimental samples of borosiloxanes were obtained from synthetic rubbers during their interaction with boronic acid in a heated reaction vessel. The synthesized borosiloxane reinforced with 3 mm-length polyester fibers   in an amount of 6 wt. % is characterized by spreading limitation, maintaining its shape due to the rigidity of the fibers frame and at the same time retaining the properties of self-adhesion while brought together disconnected borders. The creation of the multilayer material from successive layers of borosiloxane with different fluidity allows to obtain high self-healing characteristics of the final composite material after applying a through defect. The effect of self-healing of the developed layered composite during through puncture and cut is shown.


Keywords: self-restoring, self-healing, layered composite materials, self-healing matrix, borosiloxane, polyester fibers.


DOI: 10.30791/1028-978X-2020-4-11-23

 

Sitnikov Nikolay — Keldysh Research Center (Onezhskaya St., 8, 125438 Moscow, Russian Federation), PhD (Eng), deputy head of department; National Research Nuclear University MEPhI (Kashirskoe shosse, 31, 115409 Moscow, Russian Federation), deputy head of department, specialist in the field of nanotechnology and materials with shape memory effect. E-mail: sitnikov_nikolay@mail.ru.


Khabibullina Irina — Keldysh Research Center (Onezhskaya St., 8, 125438 Moscow, Russian Federation), researcher, specialist in the field of nanotechnology. E-mail:
irina-zaletova@mail.ru.


Mashchenko Vladimir — Moscow Region State University (Radio St., 10A, 105005 Moscow, Russian Federation), PhD (Chem), senior research fellow, specialist in the field of polymers. E-mail: startmodern@gmail.com.


Shelyakov Alexander — National Research Nuclear University MEPhI (Kashirskoe shosse, 31, 115409 Moscow, Russian Federation), PhD (Phys-Math), associated professor, specialist in the field of materials with shape memory effect. E-mail: alex-shel@mail.ru, AVShelyakov@mephi.ru.


Mostovaya Kseniya — Keldysh Research Center (Onezhskaya St., 8, 125438 Moscow, Russian Federation), researcher, specialist in the field of nanotechnology. E-mail:
xenon9112@gmail.com.


Vysotina Elena — Keldysh Research Center (Onezhskaya St., 8, 125438 Moscow, Russian Federation), researcher, specialist in the field of nanotechnology. E-mail:
evysotina@gmail.com.

Reference citing

Sitnikov N.N., Khabibullina I.A., Mashchenko V.I., Shelyakov A.V., Mostovaya K.S., Vysotina E.A. Sloistye samozalechivayushchiesya kompozity s vnutrennim funkcional'nym sloem na osnove borosiloksana [Layered self-healing composite material with an internal functional layer based on borosiloxane]. Perspektivnye Materialy — Advanced Materials (in Russ), 2020, no. 4, p. 11 – 23. DOI: 10.30791/1028-978X-2020-4-11-23

 

Creation of buried type heterostructures
for microwave laser diodes


M. G. Vasil’ev, A. M. Vasil’ev, Yu. O. Kostin,
A. D. Izotov, A. A. Shelyakin


Complex physicotechnological studies of overgrown messtrip structures with a channel in the substrate, etching of the mesa, and repeated overgrowing of the zinc selenide with an insulating layer were carried out. Electron microscopic studies of the planarity of heterointerfaces between the substrate and epitaxial layers were carried out. The atomic structure of GaInAsP/InP epitaxial layers was studied by transmission electron microscopy. Using secondary ion mass spectroscopy (SIMS), we analyzed the profiles of the epitaxial layers of the heterostructure. Layers of a given composition In0,78Ga0,22As0,68P0,32, corresponding to a laser wavelength of 1.3 μm, were obtained. For the first time, a technique has been developed for creating laser diodes with a channel in the substrate, with etching of the messtrip structure and overgrowing with a layer of zinc selenide. This technique makes it possible to create laser diodes both with optical limitation of laser radiation and with limitation of the current flow along the laser strip. The process of etching the layers of the pn junction between laser strips, and overgrowing by zinc selenide on the surface of the etched structure, was first developed. This allowed using the LPE method to create heterostructures for laser diodes operating in the microwave range up to 10 GHz. The possibility of creating and operating laser diodes of this design and technology is shown. The volt-ampere, watt-ampere and spectral characteristics of laser diodes are investigated. A domestic technology is proposed for creating a microwave laser diode on a heterostructure with a channel in the substrate and repeated overgrowing of zinc selenide. The prospects of using laser diodes overgrown with an insulating layer of zinc selenide to create high-speed devices are shown.


Keywords: heterostructures, laser diodes, microwave diodes, zinc selenide, channel in the substrate, amplitude-frequency characteristic.


DOI: 10.30791/1028-978X-2020-4-24-33

Vasil’ev Mihail — Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of sciences (Moscow, 119991, Leninsky prosp., 31), Dr Sci (Eng), professor, head of the laboratory of semiconductor and dielectric materials, specialist in the field of quantum electronics materials and semiconductor materials technology. E-mail: mgvas@igic.ras.ru.


Vasil’ev Anton — Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of sciences (Moscow, 119991, Leninsky prosp., 31), leading engineer, specialist in the field of the electronic instrumentation and materials. E-mail: mgvas@igic.ras.ru.


Izotov Alexandr — Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of sciences (Moscow, 119991, Leninsky prosp., 31), Dr Sci (Chem), corresponding member of RAS, chief researcher, specialist in the field of semiconductor materials, physical and solid state chemistry. E-mail izotov@igic.ras.ru.

 

Kostin Yury — Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of sciences (Moscow, 119991, Leninsky prosp., 31), PhD (Eng), researcher, specialist in the field of solid state physics  and electronic instrumentation.


Shelyakin Alexey — Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of sciences (Moscow, 119991, Leninsky prosp., 31), PhD (Eng), senior researcher, specialist in the field of semiconductor and dielectric materials technology. E-mail: mgvas@igic.ras.ru.

Reference citing

Vasil’ev M.G., Vasil’ev A.M., Kostin Yu.O., Izotov A.D., Shelyakin A.A. Sozdanie geterostruktur zaroshchennogo tipa dlya SVCH lazernyh diodov [Creation of buried type heterostructures for microwave laser diodes]. Perspektivnye Materialy — Advanced Materials (in Russ), 2020, no. 4, p. 24 – 33. DOI: 10.30791/1028-978X-2020-4-24-33

 

High-filled compositions based on alginate
gel and fine tricalcium phosphate 3D printing
of tissue-engineered matrices


A. V. Mironov, O. A. Mironova, A. O. Mariyanats,
V. S. Komlev, I. V. Smirnov, E. Y. Kananykhina,
T. Kh. Fatkhudinov, V. K. Popov


In order to obtain hydrogel matrices for bone tissu engineering, the process of formation of high-filled alginate-calcium phosphate structures by 3D printing was developed. Optimal conditions for the formation of three-dimensional structures from Ca2+ crosslinked alginate hydrogels and its high-filled compositions with fine (5 – 30 µm) α-tricalcium phosphate (TCP) were determined. Comparative analysis of properties of cross-linked alginate hydrogels showed a decrease in strength and an increase in the modulus of elasticity of the TCF-filled composite in comparison with pure hydrogel. The difference between the mechanical characteristics of the filled and pure gel increases with the density of its cross-linking. It was found that due to the significant content of the mineral dispersed phase a-TCP-filled hydrogel is not undergoing the shrinkage process during crosslinking, unlike pure alginate hydrogel. Using cultures of multipotent stromal cells of the human umbilical cord, it was shown in vitro that all studied samples of both pure and high-filled composite alginate matrices with a-TCP do not have a short-term cytotoxic effect.


Keywords: tissue engineering, 3D printing, hydrogel, alginate, a-tricalcium phosphate.

 

DOI: 10.30791/1028-978X-2020-4-34-43

Mironov Anton — Federal Research Center “Crystallography and Photonics”, Russian Academy of Sciences (Moscow, 119333, Leninsky prospect, 59), PhD, senior researcher, specialist in medical materials science, physicochemistry of polymers, additive technologies, biopolymers, regenerative medicine, supercritical fluid technologies. E-mail: scftlab@gmail.com.


Mironova Olga — Federal Research Center “Crystallography and Photonics”, Russian Academy of Sciences (Moscow, 119333, Leninsky prospect, 59), junior researcher, specialist in supercritical fluid technologies, medical materials science, information technologies in medicine, additive technologies, biopolymers. E-mail: mironova.o.a@yandex.ru.


Marianac Alexandra — Federal Research Center “Crystallography and Photonics”, Russian Academy of Sciences (Moscow, 119333, Leninsky prospect, 59), junior researcher, specialist in medical materials science, physicochemistry of polymers, additive technologies, biopolymers. E-mail: amariyanac@mail.ru.


Komlev Vladimir — Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences (Moscow, 119334, Leninsky prospect, 49), Dr.Sci., corresponding member of RAS, director, specialist in biomaterials. E-mail: komlev@mail.ru.


Smirnov Igor — Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences (Moscow, 119334, Leninsky prospect, 49), postgraduate, junior researcher, specialist in medical materials science, calcium phosphates, additive technologies, regenerative medicine. E-mail: baldyriz@gmail.com.


Kananykhina Evgeniya — Federal State Budgetary Institution “Research Institute of Human Morphology” (Moscow, 117418, Tsyurupy str., 3), junior researcher, specialist in regenerative medicine, tissue engineering. E-mail: e.kananykhina@gmail.com.

Fatkhudinov Timur — Research Institute of Human Morphology (Moscow, 117418, Tsyurupy str., 3), Dr.Sci. (Med), deputy director for scientific development, specialist in regenerative medicine, tissue engineering. E-mail: tfat@yandex.ru.


Popov Vladimir — Federal Research Center “Crystallography and Photonics”, Russian Academy of Sciences (Moscow, 119333, Leninsky prospect, 59), Dr.Sci. (Phys-Math), head of laboratory, specialist in physical chemistry, biomaterials, laser, additive and supercritical fluid technologies. E-mail: popov@laser.ru; vladikarpopov@gmail.com.

Reference citing

Mironov A.V., Mironova O.A., Mariyanats A.O., Komlev V.S., Smirnov I.V., Kananykhina E.Y., Fatkhudinov T.Kh., Popov V.K. Vysokonapolnennye kompozicii na osnove al'ginatnogo gelya i melkodispersnogo trikal'cijfosfata dlya tryohmernoj pechati tkaneinzhenernyh matriksov [High-filled compositions based on alginate gel and fine tricalcium phosphate 3D printing of tissue-engineered matrices]. Perspektivnye Materialy — Advanced Materials (in Russ), 2020, no. 4, p. 34 – 43. DOI: 10.30791/1028-978X-2020-4-34-43

 

Hybrid tricalcium phosphate/hydrogel constructs functionalized with an antitumor drug
for bone tissue regeneration


P. A. Karalkin, N. S. Sergeyeva, I. K. Sviridova,
V. A. Kirsanova, S. A. Akhmedova, Ya. D. Shansky,
N. V. Leontyev, D. M. Zuyev, E. S. Klimashina,
P. V. Yevdokimov, V. I. Putlyaev


Hybrid materials designed for the regeneration of bone defects and consisting of a resorbable ceramic base (tricalcium phosphate - TCP) coated with a layer of hydrophilic biodegradable polymer have been developed. Ceramics biocompatibility was evaluated through vitro tests using cultures of human skin fibroblasts. To increase the therapeutic potential, the created model structures were saturated with the antitumor drug doxorubicin in the composition of the coating of UV-polymerizable hydrogel based on polyacrylamide / polyethylene glycol diacrylate (PAA / PEGDA). The kinetics of drug release was studied by spectrophotometry using Ringer’s solution. The studied hybrid constructs had good cytotoxicity. Saturation of the structures with an antitumor drug led to its prolonged release. The results demonstrate the technological feasibility of creating osteoconductive implants based on calcium phosphates suitable for local delivery of antitumor drugs.


Keywords: hybrid biomaterials, tricalcium phosphate, biodegradation, hydrogels, doxorubicin, local drug delivery.


DOI: 10.30791/1028-978X-2020-4-44-57

Karalkin Pavel — P. A. Hertsen Moscow Oncology Research Center — branch of FSBI NMRRC of the Ministry of Health of Russia (3, 2nd Botkinsky drive, Moscow, 125284), PhD (Med), senior researcher, expert in biology tests of biomaterials. E-mail: pkaralkin@gmail.com.


Sergeeva Natalia — P. A. Hertsen Moscow Oncology Research Center — branch of FSBI NMRRC of the Ministry of Health of Russia (3, 2nd Botkinsky drive, Moscow, 125284), Dr Sci, professor, head of Department, expert in biology tests of biomaterials and study of tumor-associated serological markers. E-mail: prognoz.01@mail.ru.


Sviridova Irina — P. A. Hertsen Moscow Oncology Research Center — branch of FSBI NMRRC of the Ministry of Health of Russia (3, 2nd Botkinsky drive, Moscow, 125284), PhD (Biol), leading researcher, expert in biology tests of biomaterials. E-mail: prognoz.06@mail.ru.


Kirsanova Valentina — P. A. Hertsen Moscow Oncology Research Center — branch of FSBI NMRRC of the Ministry of Health of Russia (3, 2nd Botkinsky drive, Moscow, 125284), PhD (Biol), researcher, expert in biology tests of biomaterials. E-mail: prognoz.06@mail.ru.


Akhmedova Suraya — P. A. Hertsen Moscow Oncology Research Center — branch of FSBI NMRRC of the Ministry of Health of Russia (3, 2nd Botkinsky drive, Moscow, 125284), PhD (Biol), researcher, expert in biology tests of biomaterials. E-mail: prognoz.06@mail.ru.


Shansky Yaroslav — P. A. Hertsen Moscow Oncology Research Center — branch of FSBI NMRRC of the Ministry of Health of Russia (3, 2nd Botkinsky drive, Moscow, 125284), PhD (Biol), researcher, expert in biology tests of biomaterials. E-mail: prognoz.06@mail.ru.


Leontiev Nikolay — Lomonosov Moscow State University, Chemistry Department (119991, Moscow, Leninskie Gory, 1, bd.3, GSP-1, MSU, Chemistry Department), student, fields of interests — hybrid biomaterials. E-mail: ganzauskas@yandex.ru.


Zuev Dmitry — Lomonosov Moscow State University, Department of Materials Science (119991, Moscow, Leninski Gori, 1, bd.73, GSP-1, MSU, Chemistry Department), graduated student, field of intersts – inorganic and hybrid biomaterials. E-mail: zuev.dmitri@gmail.com.


Klimashina Elena — Lomonosov Moscow State University, Chemistry Department (119991, Moscow, Leninskie Gory, 1, bd.3, GSP-1, MSU, Chemistry Department), PhD, researcher, expert in chemistry of inorganic materials. E-mail: klimashina@inorg.chem.msu.ru.


Evdokimov Pavel — Lomonosov Moscow State University, Chemistry Department (119991, Moscow, Leninskie Gory, 1, bd.3, GSP-1, MSU, Chemistry Department), PhD (Chem), junior researcher, expert in chemistry of inorganic materials. E-mail: pavel.evdokimov@gmail.com.


Putlayev Valery — Lomonosov Moscow State University, Chemistry Department (119991, Moscow, Leninskie Gory, 1, bd.3, GSP-1, MSU, Chemistry Department), PhD (Chem), associated professor, expert in chemistry of inorganic materials. E-mail:
valery.putlayev@gmail.com.

Reference citing

Karalkin P.A., Sergeyeva N.S., Sviridova I.K., Kirsanova V.A., Akhmedova S.A., Shansky Ya.D., Leontyev N.V., Zuyev D.M., Klimashina E.S., Yevdokimov P.V., Putlyaev V.I. Gibridnye konstrukcii trikal'cijfosfat/gidrogel', prednaznachennye dlya regeneracii kostnoj tkani i funkcionalizirovannye protivoopuholevym preparatom [Hybrid tricalcium phosphate/hydrogel constructs functionalized with an antitumor drug for bone tissue regeneration]. Perspektivnye Materialy — Advanced Materials (in Russ), 2020, no. 4, p. 44 – 57. DOI: 10.30791/1028-978X-2020-4-44-57

 

Thermomechanical properties of nanocomposites based
on clinoptilolite and copolymer of ethylene with hexen


N. T. Kakhramanov, I. V. Bayramova, S. S. Pesetsky


The results of a study of clinoptilolite concentration effect on the thermomechanical properties of nanocomposites based on ethylene-hexene copolymer are presented. The concentration of clinoptilolite varied from 0.5 to 20 wt. %. It has been established that with an increase in the filler concentration, an increase in the softening temperature of the nanocomposite is observed from 113 to 126 °C. The separate effect of crosslinking agents of vulcanization — dicumyl peroxide and sulfur on the main physical-mechanical properties of nanocomposites is shown. Found that the highest values of ultimate tensile stresses have compositions containing 5 wt. % of clinoptilolite and 0.5 wt. % dicumyl peroxide. The effect of sulfur vulcanization on the properties of nanocomposites has been investigated. In contrast to peroxide vulcanization, sulfuric contributes to a slight increase in the heat resistance of the samples while maintaining a rather good level of ultimate tensile stress, elongation at break and melt flow. The thermomechanical properties of peroxide and sulfur vulcanized nanocomposites are investigated.


Keywords: thermomechanical curves, clinoptilolite, dicumyl peroxide, sulfur, crosslinked structure, nanocomposite.


DOI: 10.30791/1028-978X-2020-4-58-66

Kahramanov Najaf Tofig — Institute of Polymer Materials of Azerbaijan National Academy of Sciences (Azerbaijan, Sumgayit, AZ 5004, S.Vurgun Str, 124), Dr Sci (Chem), professor, head of the laboratory Mechanochemical modification and processing of polymers, specialist in the area of chemical and mechano-chemical modification of polymers, investigation and prossesing of composite materials. E-mail: najaf1946@rambler.ru.


Bayramova Ilaha Vilayat — Institute of Polymer Materials of the Azerbaijan National Academy of Sciences (Azerbaijan, Sumgayit, AZ 5004, S.Vurgun Str, 124), researcher, specialist in the area of mechano-chemical modification and investigation of polymers.

 

Pesetskiy Stepan — Institute of Mechanics of Metal-Polymer Systems of the Belarus National Academy (246050, G. Gomel, ul. Kirova 32A), Dr Sci (Eng), professor, corresponding member of Belarus National Academy, head of department, Leading specialist in the field of modification and technology for processing polymer materials.

Reference citing

Kakhramanov N. T., Bayramova I. V., Pesetsky S. S. Termomekhanicheskie svojstva nanokompozitov na osnove klinoptilolita i sopolimera etilena s geksenom [Thermomechanical properties of nanocomposites based on clinoptilolite and copolymer of ethylene with hexen]. Perspektivnye Materialy — Advanced Materials (in Russ), 2020, no. 4, p. 58 – 66. DOI: 10.30791/1028-978X-2020-4-58-66

 

Influence of carbon nano-tubes adding on electric conductivity and heating of elastomers
under electric current flowing


A. V. Shchegolkov, V. S. Yagubov, Yu. A. Khan, F. F. Komarov


The article presents the study of thermal effects during the flow of direct current in nanomodified elastomers. Two types of elastomers were investigated — polyurethane and organosilicon compounds. For nanomodification, multilayer carbon nanotubes (MWCNTs) synthesized on (Co – Mo)/(Al2O3 – MgO) and (Fe – Co)/2,1Al2O3 catalysts were used. MWCNTs with various morphological parameters were synthesized on this type of catalyst. Granulometric analysis of MWCNTs was carried out. The highest electrical conductivity (1.66·10–1 cm·cm–1) was observed for a composite made on the basis of an organosilicon compound modified with 7 wt. % MWCNTs synthesized on a (Co – Mo)/(Al2O3 – MgO) catalyst. Low electrical conductivity (6·10–10 cm·cm–1) was demonstrated by a composite made of a polyurethane compound modified with 1 mass. % MWCNTs synthesized on (Fe – Co)/2.1Al2O3 catalyst. Using the non-contact method of measuring the temperature field on the surface of samples of nanomodified elastomers, differences in heat release for different types of elastomers modified by MWCNTs are revealed. A similar mechanism of stabilized heat dissipation is established, which is characteristic of materials with a positive temperature coefficient of resistance. The highest heat release intensity combined with the uniform distribution of the temperature field was observed for samples made on the basis of an organosilicon compound containing 7 wt. % MWCNTs synthesized on a (Fe – Co)/2.1Al2O3 catalyst. The maximum heating temperature for a sample operating under a voltage of 6 V DC was 102 °C. Uneven heat is characteristic of almost all samples made on the basis of polyurethane compound. In this case, samples based on an organosilicon compound demonstrate uniform heating at any filling level (wt. %) Of MWCNTs. In the course of the research, a honeycomb structure sample was obtained, which, under a voltage of 6 V DC, was heated to 100 °C and had a uniform distribution of the temperature field.


Keywords: carbon nanotubes, catalyst, organosilicon compound, polyurethane compound, heat dissipation, direct current, modifier.


DOI: 10.30791/1028-978X-2020-4-67-78

Shchegolkov Alexander — Tambov State Technical University (Tambov, 392000, Sovetskaya ul., 106), PhD (Eng), associate professor, department of Engineering and Technology for the Production of Nanoproducts, specialist in the field of functional nanomodified materials for energy. E-mail: energynano@yandex.ru.


Yagubov Viktor — Tambov State Technical University (Tambov, 392000, Sovetskaya ul., 106), graduate student department of Engineering and Technology for the Production of Nanoproducts, specializes in development of electrically conductive, nanomodified materials. E-mail: vitya-y@mail.ru.


Khan Yulian — Tambov State Technical University (Tambov, 392000, Sovetskaya ul., 106), graduate student of department of Engineering and Technology for the Production of Nanoproducts, specialist in the field of analysis, nanomaterials and polymers based on them. E-mail: khantermail@gmail.com.


Komarov Fadey — A.N. Sevchenko Institute of Applied Physical Problems of Belarussian State University (7, Kurchatova str., 220045, Minsk, Republic of Belarus), Dr Sci (Phys-Math), professor, corresponding member of the National academy of sciences of Belarus, head of the laboratory, specialist in physics of interaction of charged particles and hard electromagnetic radiation with solids, optics of x-ray and gamma rays, nanomaterials, nanoelectronics, track nanoelectronics. E-mail: komarovF@bsu.by.

Reference citing

Shchegolkov A.V., Yagubov V.S., Khan Yu.A., Komarov F.F. Vliyanie dobavki uglerodnyh nanotrubok na elektroprovodnost' i teplovydeleniya elastomerov pri protekanii postoyannogo elektricheskogo toka [Influence of carbon nano-tubes adding on electric conductivity and heating of elastomers under electric current flowing]. Perspektivnye Materialy — Advanced Materials (in Russ), 2020, no. 4, p. 67 – 78. DOI: 10.30791/1028-978X-2020-4-67-78

 

Study of the formation of carbide phases
and tribological properties of pyrolytic carbide chrome
coating on steel after annealing


O. V. Somov, V. A. Vasin, A. A. Ashmarin


Currently, requirements are increasing for the working surfaces of steel products operating in conditions of intense wear (plain bearings, rotation pairs, mechanical seals). The use of protective composite coatings is one of the ways to reduce metal loss and improve product reliability. In addition, the use of protective coatings instead of metals is in many cases economically feasible, especially for repeated restoration of worn surfaces of products. The paper presents the results of X-ray phase analysis of annealed samples of 40Cr steel with pyrolytic carbide chrome coating (PCCC), obtained by deposition from the gas phase using organometallic chromium-containing liquid “BARHOS”. Annealing of samples with PCCC was carried out in air and in vacuum at discrete temperatures of 700, 800, 900 and 1000 °C. The paper describes the formation of the phase composition of PCCC at different annealing regimes. The article studies the effect of annealing on the tribological properties of PCCC on a steel substrate. Studies have shown the potential of using PCCC with subsequent annealing to obtain a combination of wear-resistant carbidechromic phases with a coating, providing optimal tribological characteristics of the modified surface of steel products used under conditions of friction and wear.


Keywords: pyrolytic carbide-chrome coating; annealing; phase composition; chromium carbide; wear resistance.


DOI: 10.30791/1028-978X-2020-4-79-88

Somov Oleg — JSC Polygon MT (Moscow region, Chekhov district, Novyy Byt, st. NATI, d. 13), PhD (Eng), senior researcher, specialist in the field of protective coatings. E-mail: ovsomov@mail.ru.


Vasin Vladimir — JSC Polygon MT (Moscow region, Chekhov district, Novyy Byt, st. NATI, d.13), Dr Sci (Eng), General director, specialist in the field of design and construction for new promising developments and improvement of engineering products. Е-mail: info@polygon-mt.ru.

 

Ashmarin Artem — Baikov Institution of Metallurgy and Material Science of Russian Academy of Sciences (119334, Moscow, Leninsky Prospekt, 49), PhD (Eng), senior researcher, specialist in diffractometric studies of metal and ceramic materials, including at elevated temperatures. E-mail: ashmarin_artem@list.ru.

Reference citing

Somov O.V., Vasin V.A., Ashmarin A.A. Issledovanie formirovaniya karbidnyh faz i tribologicheskih svojstv piroliticheskogo karbidohromovogo pokrytiya na stali posle otzhiga [Study of the formation of carbide phases and tribological properties of pyrolytic carbide chrome coating on steel after annealing]. Perspektivnye Materialy — Advanced Materials (in Russ), 2020, no. 4, p. 79 – 88. DOI: 10.30791/1028-978X-2020-4-79-88

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