Synthesis and electrochemical properties
of nanodisperse titanate of lithium
S. E. Smirnov, V. A. Zhorin, M. R. Kiselev,
S. S. Smirnov, N. A. Yashtulov
The method of synthesis of a nanodispersnogotitanat of lithium including mechanoactivation of a precursor on the equipment of a high pressure like Bridzhmen’s anvils is offered. Electrodes on the basis of the synthesized Li4Ti5O12 surpass known analogs in specific capacity, especially at high digit currents that is caused by much higher dispersion of the synthesized active material and use as binding electroconductive solidpolymer electrolyte which provides fairness of a surface of particles of active material of the anode. The fullest use of titanate of lithium in the course of the category charge and, as a result, big specific digit capacity is as a result reached. Advantage of solid-phase electrodes before analogs in stability is caused by existence in structure of the last of liquid electrolyte which, as we know, differs in corrosion activity that leads to essential losses of capacity in the course of a charge category.
Keywords: synthesis, titanate, nanoparticles, X-ray phase analysis, electrode, accumulator.
Smirnov Sergey — National Research University “Moscow Power Engeneering Institute” (14, Krasnokazarmennaya ul., 111250 Moscow), DrSci (Eng), professor, Department of Chemistry and electrochemical energetic, specialist in chemical electrical sources. E-mail: sesmirnov53@ mail.ru.
Zhorin Vladimir — Semenov Institute of Chemical Physics (4, Kosygina ul., 119991 Moscow), DrSci (phys-math), main science collegue, specialist in materials treatment. E-mail: vzhorin@mail.ru.
Kiselev Mikhail — Frumkin Institute of Physical Chemistry and Electrochemistry (31, Leninskiy pr., 119991 Moscow), PhD (Chem), main science collegue, specialist in materials treatment. E-mail: kisselev@phyche.ac.ru.
Smirnov Sergey — National Research University “Moscow Power Engeneering Institute” (14, Krasnokazarmennaya ul., 111250 Moscow), PhD (Eng), main science collegue of Chemistry and electrochemical energetic department, specialist in chemical electric sources. E-mail: smirnovss23@mail.ru.
Yashtulov Nikolay — Moscow Technological University (MIREA, 86, Vernadskogo pr., 119571 Moscow), DrSci (Chem), professor of Phisical chemistry department, specialist in physical chemistry. E-mail: YashtulovNA@mail.ru.
Reference citing
Smirnov S. E., Zhorin V. A., Kiselev M. R., Smirnov S. S., Yashtulov N. A. Sintez i ehlektrohimicheskie svojstva titanata litiya [Synthesis and electrochemical properties of nanodisperse titanate of lithium]. Perspektivnye Materialy — Advanced Materials (in Russ), 2018, no. 3, pp. 5 – 11.
DOI: 10.30791/1028-978X-2018-3-5-11.
Promising membrane material NiO – 30 wt. % Ag –
40 wt. % Bi2O3 for separation of oxygen from air
I. V. Kulbakin, S. V. Fedorov
Сomposite NiO – 30 wt.% Ag – 40 wt.% Bi2O3 material was synthesized and studied. Microstructure of this material, cooled from 800 °C, was studied, and the presence of a percolative net of silver in the bulk of composite was shown. Transport properties of this composite (electrical conductivity, transport numbers of oxygen ion, and oxygen fluxes) under 725 – 800 °C temperature range were investigated. The oxygen permeability of the membrane based on NiO – 30 wt.% Ag – 40 wt.% Bi2O3 material was calculated, and the selectivity of transferred oxygen over nitrogen while separating from air was evaluated. Thus, under 800 °C the value of total electrical conductivity was of ~ 50 Ω–1∙cm–1, the value of transport number of oxygen — 0,02, the oxygen permeability — 2,1∙10–8 mol∙cm–1∙s–1, and the selectivity of oxygen (over nitrogen) was above 1000. The oxygen permeability of some ceramic and cermet membranes and of the membrane material obtained in this work was compared. The NiO – 30 wt.% Ag – 40 wt.% Bi2O3 composite shows high selective oxygen permeability, compared to the state-of-the-art analogs, and can be used as an ion transport membrane for separation of oxygen from air.
Keywords: composite, cermet, melt, membrane, oxygen.
Kulbakin Igor — A.A. Baikov Institute of Metallurgy and Materials Science (Moscow, 119334, Leninskii pr., 49), PhD, staff researcher, specialist in chemistry of new functional ceramic and composite materials, and in inorganic membrane materials science. E-mail: ivkulbakin@mail.ru.
Fedorov Sergey — A.A. Baikov Institute of Metallurgy and Materials Science (Moscow, 119334, Leninskii pr., 49), PhD, leading staff researcher, specialist in solid state chemistry, and in inorganic membrane materials science. E-mail: fedserv@rambler.ru.
Reference citing
Kulbakin I. V., Fedorov S. V. Perspektivnyj membrannyj material NiO – 30 mass.% Ag – 40 mass.% Bi2O3 dlya vydeleniya kisloroda iz vozduha [Promising membrane material NiO – 30 wt. % Ag – 40 wt. % Bi2O3 for separation of oxygen from air]. Perspektivnye Materialy — Advanced Materials (in Russ), 2018, no. 3, pp. 12 – 18.
DOI: 10.30791/1028-978X-2018-3-12-18.
Magnetic properties of Sm(Co0.45Fe0.15Cu0.40)5 alloy prepared by “strip casting” technique
A. A. Lukin, N. B. Kolchugina, Yu. S. Koshkid’ko,
A. V. Kamynin, D. Yu. Vasilenko
Magnetic properties and phase composition of Sm(Co0.45Fe0.15Cu0.40)5 alloy prepared by strip-casting technique have been studied. Magnetization curves from thermally demagnetized state were measured in fields to 140 kOe using plates in the starting state (after “strip-casting”) and after low-temperature annealing at 350 °С for 120 h. It was shown that the magnetization of samples (σ140 and σr) decreases substantially after the annealing; in this case, the coercive force increases abruptly. It was assumed that the observed regularities of magnetic hardening can be related to the existence nano-sized Cu-enriched areas, in which the antiferromagnetic order in Sm(Co,Fe,Cu)5 is realized. These areas can be domain-wall pinning centers in the ferromagnetic phase with the lower copper content.
Keywords: Sm(Co0.45Fe0.15Cu0.40)5 alloy, “strip casting”, CaCu5-type structure, magnetic hardening, hysteretic properties, antiferromagnetic order.
Lukin Aleksandr — JSC Spetsmagnit (Dmitrovskoe sh. 58, Moscow, 127238 Russia), PhD (Phys-Math), specialist in area of permanent magnets and magnetization. E-mail: lukinaalukin@rambler.ru. Kolchugina Natalia — Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences (Leninskii pr. 49, Moscow, 119334 Russia), PhD (Eng), leading research worker, specialist in magnet materials structure investigation. E-mail: natalik@imet.ac.ru.
Koshkid’ko Yurii — Institute of Low Temperature and Structure Research, Polish Academy of Sciences (Poland, Wroclaw, Okolna 2, 50-422), PhD (Phys-Math), research worker, specialist in the field of physics of magnetism and magnetic phenomena.
E-mail: yurec@mail.ru.
Kamynin Anton — JSC Spetsmagnit (Dmitrovskoe sh. 58, Moscow, 127238 Russia), specialist in magnet materials, sintered magnets and structure study.
Vasilenko Danil — Ural Electomechanical Plant (ul. Studencheskaya 9, Ekaterinburg, 620137 Russia), specialist in the production of sintered permanent magnets.
Reference citing
Lukin A. A., Kolchugina N. B., Koshkid’ko Yu. S., Kamynin A. V., Vasilenko D. Yu. Magnitnye svojstva splava Sm(Co0,45Fe0,15Cu0,40)5, poluchennogo metodom “strip casting” [Magnetic properties of Sm(Co0.45Fe0.15Cu0.40)5 alloy prepared by “strip casting” technique]. Perspektivnye Materialy — Advanced Materials (in Russ), 2018, no. 3, pp. 19 – 27.
DOI: 10.30791/1028-978X-2018-3-19-27.
Phase transformations in mechanochemically synthesized crystalline Dy2TiO5 nanopowders during annealing
J. V. Eremeeva, S. Vorotilo, D. Yu. Kovalev, A. A. Gofman,
V. Yu. Lopatin, A. A. Gunya, E. V. Morozova
The goal of this work was to investigate the phase transformations that occur during the annealing of Dy2TiO5 crystalline nanopowders. Crystalline nanopowders of Dy2TiO5 were produced by mechanochemical synthesis, using anatase and Dy2O3 as the initial reagents. Nanopowders were investigated by the SEM, XRD and Raman spectra analysis. Differential scanning calorimetry (DSC) showed the presence of exothermic peaks that do not correspond to the Dy2O3 – TiO2 phase diagram. To investigate the phase transformations during the annealing, in situ XRD analysis was used. The following phase transformations take place when the powder is heated up to 1200 °C: α-Dy2TiO5 → β-Dy2TiO5 + Dy2O3 + Dy2Ti2O7. Temperature intervals and mechanisms of phase formation depend on the conditions of mechanochemical synthesis and on the structure of mechanochemically synthesized powder.
Keywords: mechanochemical synthesis, dysprosium titanate, Dy2TiO5, in situ XRD analysis.
Eremeeva Janna — NUST MISIS (Leninsky Prospect, 119991, Moscow), Dr.Sci. (Eng), professor of Department of powder metallurgy and functional coatings, specialist in the field of mechanochemical synthesis and powder metallurgy. Е-mail: eremeeva-shanna@yandex.ru.
Vorotilo Stepan — NUST MISIS (Leninsky Prospect, 119991, Moscow), graduate student, engineer of powder metallurgy and functional coatings department, specialist in the field of mechanochemical synthesis and powder metallurgy. Е-mail: s.vorotilo@misis.ru.
Kovalev Dmitriy — Institute of Structural Macrokinetics and Materials Science of Russian Academy of Sciences RAS (ISMAN, Academician Osipyan str., 8, Chernogolovka, Moscow Region, 142432, Russia), Ph.D., head of laboratory of XRD analysis, specialist in the field of XRD analysis. Е-mail: kovalev@ism.ac.ru.
Gofman Andrey — NUST MISIS (Leninsky Prospect, 119991, Moscow), master course student, Department of powder metallurgy and functional coatings, specialist in the field of mechanochemical synthesis and powder metallurgy. Е-mail: andrew_gofman@mail.ru.
Lopatin Vladimir — NUST MISIS (Leninsky Prospect, 119991, Moscow), Ph.D., assistant professor of Department of powder metallurgy and functional coatings, specialist in the field of powder metallurgy. Е-mail: lopatin63@mail.ru.
Gunya Aleksey — JSC Graviton (Novolesnaya ul., 7/11, off. 22, 127055 Moscow), CEO, specialist in the field of special machinery and plasma plants. E-mail: gunya1988@inbox.ru.
Morozova Evgeniya — Moscow Polytechnic University (Bolshaya Semenovskaya str., 38, Moscow, 107023), postgraduate student, department of Technology and metallurgical equipment, specialist in the field of metallurgy.
Reference citing
Eremeeva J. V., Vorotilo S., Kovalev D. Yu., Gofman A. A., Lopatin V. Yu., Gunya A. A., Morozova E. V. Fazovye prevrashcheniya mekhanosintezirovannyh nanoporoshkov Dy2TiO5 pri nagreve [Phase transformations in mechanochemically synthesized crystalline Dy2TiO5 nanopowders during annealing]. Perspektivnye Materialy — Advanced Materials (in Russ), 2018, no. 3, pp. 28 – 35.
DOI: 10.30791/1028-978X-2018-3-28-35.
Carbon nanotubes in finely dispersed liquid systems
O. A. Kotykhova, N. S. Trutnev
Multi-walled carbon nanotubes (MWCNT) were dispersively using ultrasound (ULTRASONIC) at a temperature of 20 °C in distilled water, water with electrolytes (with a concentration of not more than 2 %); hexane, heptane, toluene, ethanol, isopropanol, acetone, ethylene glycol, glycerol, ethyl acetate, N-methylpyrrolidone, dichloroethane, tetrachloromethane. MWCNT was dispersed in heptane, N-methylpyrrolidone, ethyl acetate, dichloroethane, tetrachloromethane. MWCNT give the coarse suspension with water, hexane, toluene, ethanol, isopropanol, acetone, ethylene glycol, glycerin. To enhance the dispersion of MWCNT and the stabilization of the obtained disperse systems they added soluble polymers: natural (gelatin and starch) and synthetic (polyvinyl and polyvinyl alcohol). Revealed that starch and polyvinyl alcohol (PVA) do not contribute to the dispersion of the MWCNT in none of the presented solvents as gelatin and polyvinylpyrrolidone (PVP) — contribute. So gelatin, soaked in water, wets the MWCNT, and after twenty minutes of ULTRASONIC dispersion is robust fine system. In the presence of polyvinylpyrrolidone is dispersed MWCNTs is much stronger than in the pure solvent, forming a fine suspension. Mass fraction of MWCNT in such systems is approximately 0.1 %. Determined specific conductivity (UEP) studied the ternary mixtures of (solvent-soluble polymer, MWCNT). It is shown that the presence of MWCNTs increases the conductivity of the solvent.
Keywords: Multi-walled carbon nanotubes, particulate systems, soluble polymers, polyvinylpyrrolidone, ultrasonic dispersion, the specific conductivity of solutions, a three-component system.
Kotykhova Olga — Moscow Polytechnic University (107023, Moscow, Bolshaya Semyonovskaya st., 38), PhD (chem), associate professor of Scientifically-educational center СhemBioTech, specialist in area of organic chemistry. E-mail: buhtaprov59@mail.ru.
Trutnev Nikolay — Moscow Polytechnic University (107023, Moscow, Bolshaya Semyonovskaya st., 38), PhD (eng), associate professor, professor of Instrumentation and automation of technological production, Director of Nano MT Center, specialist in the field of obtaining and processing of nanomaterials. E-mail: trutnev7@yandex.ru.
Reference citing
Kotykhova O. A., Trutnev N. S. Uglerodnye nanotrubki v melkodispersnyh zhidkih sistemakh [Carbon nanotubes in finely dispersed liquid systems]. Perspektivnye Materialy — Advanced Materials (in Russ), 2018, no. 3, pp. 36 – 43.
DOI: 10.30791/1028-978X-2018-3-36-43.
Porous refractory ceramics as a protective material
in explosive loading of metal container
R. D. Kapustin, P. A. Nikolaenko
Experimental testing of a porous aluminosilicate refractory ceramic materials as protective energy-absorbing elements of the design of large layouts explosion-proof thin-walled metal containers was carried out. It has been established that significantly (two and more times) increase explosion-proof characteristics of the EC at the same time minimizing their weight and size are effective using of refractory porous materials. These materials significantly reduce the impact on the metal shell of the ЕC as shock wave and other damaging factors of the explosion. Full-size models of explosion-proof containers with a diameter of 1.2 m, capable of withstanding an explosive charge of explosive (TNT) with a mass of not less than 3.5 kg without going beyond the range of elastic deformation of the metal shell are developed. The results of the research make it possible, without expensive R & D, to design similar explosion-proof containers in a wide mass-scale range with predetermined explosion-proof characteristics. Hard refractory porous materials are promising for the creation of non-stationary transported explosion-proof containers for the storage, transportation and destruction of explosive materials and devices, since their use makes it possible to significantly reduce the material capacity, mass and dimensions of EC.
Keywords: еxplosion-proof containers, porous refractory materials, energy absorption.
Kapustin Roman — Institute of Structural Macrokinetics and Materials Science of Russian Academy of Sciences RAS (ISMAN, Academician Osipyan str., 8, Chernogolovka, Moscow Region, 142432, Russia), Ph.D., senior research fellow, specialist in the field of shock-wave pr of refractory materials. E-mail: revan.84@mail.ru.
Nikolaenko Pavel — Institute of Structural Macrokinetics and Materials Science of Russian Academy of Sciences RAS (ISMAN, Academician Osipyan str., 8, Chernogolovka, Moscow Region, 142432, Russia), Ph.D., research fellow, specialist in the field of shock-wave processes. E-mail: nikpavel@mail.ru.
Reference citing
Kapustin R. D., Nikolaenko P. A. Ispol'zovanie poristoj ogneupornoj keramiki v kachestve zashchitnogo materiala pri vzryvnom nagruzhenii metallicheskogo kontejnera [Porous refractory ceramics as a protective material in explosive loading of metal container]. Perspektivnye Materialy — Advanced Materials (in Russ), 2018, no. 3, pp. 44 – 48.
DOI: 10.30791/1028-978X-2018-3-44-48
Production of clinker ceramic products from wastes
of non-ferrous metallurgy and aluminum-containing technogenic raw materials
V. Z. Abdrakhimov, E. S. Abdrakhimova
One of the promising areas to obtain a clinker ceramic materials is using a waste of non-ferrous metallurgy and aluminumcontaining technogenic raw materials. The developed compositions of ceramic masses for the production of ceramic products based on the clay part of “tails” of gravity zircon-ilmenite ores and technogenic raw materials ─ spent catalyst IM-2201 from NovoKuibyshev petrochemical plant, without the use of traditional natural raw materials. Designed clinker ceramic products differ from other ceramic materials due to higher mechanical strength, frost resistance, heat resistance and chemical resistance. Sintering of ceramics leads to formation of final structure of the products ─ with a well-developed glassy mass, which is achieved due to the elevated firing temperature of ceramic pottery and a content of iron oxide in the GCI. Basically in the samples, there are three types of pores: slit-like, isothermal and bizarre pore. In addition, the sample includes relatively large oval pores (up to 40 µm) and channels-type pores. Presence of these pores determine the water absorption of ceramic materials. The presence of slit-shaped pores indicates on incompletion of the sintering process.
Keywords: paving products, clay part of “tails” of gravity, disulfides, nanotechnogenic raw materials.
Abdrakhimov Vladimir — Samara State University of Economics, Department of materials science (Samara, 443090, Samara, Soviet Army street, 141), DrSci (Eng), professor, specialist in the field of physical chemistry of the silicates. E-mail: 3375892@mail.ru.
Abdrakhimova Elena — Samara State Research University, Department of chemistry (Samara, 443086 St. Moscow shosse 34, Samara, Russia), PhD (Eng), associate professor, specialist in the field of physical chemistry of the silicates. E-mail: intdep@ssau.ru.
Reference citing
Abdrakhimov V. Z., Abdrakhimova E. S. Poluchenie klinkernyh keramicheskih izdelij iz othodov proizvodstva cvetnoj metallurgii i alyumosoderzhashchego tekhnogennogo syr'ya [Production of clinker ceramic products from wastes of non-ferrous metallurgy and aluminum-containing technogenic raw materials]. Perspektivnye Materialy — Advanced Materials (in Russ), 2018, no. 3, pp. 49 – 56.
DOI: 10.30791/1028-978X-2018-3-49-56.
Synthesis and study of electrode materials
for supercapacitors based on carbon fibrous
materials and metal oxides/hydroxides
S. I. Yusin, O. V. Karunina
The properties of composites based on activated carbon fiber material and oxygen-containing compounds of transition metals (MnO2, Ni(OH)2, Co(OH)2) obtained by electrophoresis from colloidal solutions are investigated. It was found that all composite materials had a higher specific capacity than the original components apart. The maximum specific capacity was obtained on the composite “AUVM – Ni(OH)2” (~ 380 Fg–1). The change in the specific capacitance of activated carbon fiber material and composites based on it, depending on the number of current-voltage cycles, as well as on the time spent in the electrolyte and the rate of development of the potential has been studied. It is shown that the specific capacitance of all composite materials increased in the course of such cycling, as the rate of development of the potential increased the capacity decreased.
Keywords: electrophoresis, activated carbon fibrous material, manganese oxide, nickel hydroxide, cobalt hydroxide.
Yusin Stepan — Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch of the Russian Academy of Sciences (Novosibirsk, 630091, Michurin str., 15), Ph.D. (Chem), research associate, specialist in the field of modification of synthetic fibers, surface physicochemistry, nanomaterials application. E-mail: yusin.s@yandex.ru.
Karunina Oksana — Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch of the Russian Academy of Sciences (Novosibirsk, 630091, Michurina str., 15), Ph.D. (Chem), research associate, specialist in analytical chemistry, volt-ammetry. E-mail: o.karunina@yandex.ru.
Reference citing
Yusin S. I., Karunina O. V. Sintez i issledovanie ehlektrodnyh materialov dlya superkondensatorov na osnove uglerodnyh voloknistyh materialov i oksidov/gidroksidov metallov [Synthesis and study of electrode materials for supercapacitors based on carbon fibrous materials and metal oxides/hydroxides]. Perspektivnye Materialy — Advanced Materials (in Russ), 2018, no. 3, pp. 57 – 64.
DOI: 10.30791/1028-978X-2018-3-57-64.
Frame catalysts of Al2O3 – ZrO2 – CeO2 system
L. I. Podzorova, S. G. Chuklina, A. A. Il’icheva, A. A. Konovalov,
O. I. Pen’kova, S. A. Maslenkova, A. I. Pylinina
Xerogels and powders of Al2O3 – ZrO2 – CeO2 systems with different pore structure and matrixes of ZrO2 and Al2O3 were obtained. The specific surface area of xerogels with ZrO2 and Al2O3 matrix exceeds 200 m2/g and 90 m2/g respectively. After calcinations at 950 °C, the powders retain nanoscale, with the size of individual particles ranging from 70 to 28 nm. The main crystalline phase in these powders is a solid solution of tetragonal zirconia. Total ethanol conversion of xerogels with ZrO2 and Al2O3 matrix has similar values. Selectivity of to ethylene conversion is about 50 % and doesn’t depend on calcination temperature. For samples with an Al2O3 matrix, a 50 % ethylene selectivity was reached after heating at 950 °C. It was shown that the catalytic activity of ethanol conversion reaction is higher for samples with more crystallized phase based on solid solution of tetragonal zirconia, namely, for samples with the ZrO2 matrix calcinated at 950 °C.
Keywords: ceramics, zirconiа, alumina, phase structure, ethanol, catalytic activity.
Podzorova Lyudmila — Baikov Institute of Metallurgy and Materials Science of the Russian Academy of Sciences (Leninsky prospect, 49, Moscow, 119991, Russia), PhD (Chem), leading researcher, expert in physical chemistry of inorganic materials, materials science, ceramics. E-mail: podzorova@pochta.ru.
Chuklina Sofia — RUDN University (117198, Moscow Miklukho-Maklaya str.6), PhD student, department of Physical and Colloidal chemistry, science faculty, specialization in physical chemistry, catalysis. E-mail: sofyaogan@gmail.com.
Il’icheva Alla — Baikov Institute of Metallurgy and Materials Science of the Russian Academy of Sciences (Leninsky prospect, 49, Moscow, 119991, Russia), senior research associate, expert in the field of inorganic chemistry, synthesis of materials.
Pen’kova Olga — Baikov Institute of Metallurgy and Materials Science of the Russian Academy of Sciences (Leninsky prospect, 49, Moscow, 119991, Russia), research associate, expert in technology of ceramics.
Konovalov Anatoliy — Baikov Institute of Metallurgy and Materials Science of the Russian Academy of Sciences (Leninsky prospect, 49, Moscow, 119991, Russia), PhD (Chem), leading researcher, expert in physical chemistry of solid body, X-ray phase analysis.
Maslenkova Svetlana — RUDN University (117198, Moscow Miklukho-Maklaya str.6), master degree student, department of Physical and Colloidal chemistry, science faculty.
Pylinina Anna — RUDN University (117198, Moscow Miklukho-Maklaya str.6), PhD, department of Physical and Colloidal chemistry, science faculty, specialist in physical and colloidal chemistry, material science, catalysis, adsorption.
Reference citing
Podzorova L. I., Chuklina S. G., Il’icheva A. A., Konovalov A. A., Pen’kova O. I., Maslenkova S. A., Pylinina A. I. Karkasnye katalizatory sistemy Al2O3 – ZrO2 – CeO2 [Frame catalysts of Al2O3–ZrO2–CeO2 system]. Perspektivnye Materialy — Advanced Materials (in Russ), 2018, no. 3, pp. 65 – 71.
DOI: 10.30791/1028-978X-2018-3-65-71.
Experimental study of acoustic properties and microhardness of 45-type steel
V. V. Roshchupkin, M. M. Lyakhovitskii, M. A. Pokrasin,
N. A. Minina, E. M. Kudryavtsev
The paper presents the results of investigation of the ultrasonic velocity, the relative temperature expansion and microhardness of steel 45. Steel 45 refers to structural carbon quality alloys, which are used for structures and devices, the functional purpose of which is resistance to high loads. The measurements were carried out both on annealed and quenched samples. An experimental study of the acoustic properties and thermal expansion of steel 45 was carried out in the temperature range from room temperature to 1100 °C and microhardness up to 500 °C. To take into account the thermal expansion of the steel, dilatometric studies were carried out, the results of which were taken into account in calculating the acoustic properties and in constructing the temperature dependence of the density and Young’s modulus of steel. The temperature boundaries of the phase transformations in the investigated steel are determined. An experimental study of the acoustic properties of steel was carried out according to the methodology developed by the authors of the GSSD ME 216-2014 method, which was developed by the authors and certified by the FGPU “Standardinform”. Investigation of the microhardness was carried out by the method of continuous indentation using the Berkovich indenter in accordance with the international standard ISO 14577-1.215, 2.215, 3.215 and 4.207 on the NanoTest automatic installation. Based on the results of the experimental and calculated data, approximating equations are proposed for the temperature dependences of the thermophysical and mechanical properties of the investigated steel.
Keywords: ultrasonic velocity, thermal expansion, density, Young’s modulus, microhardness.
Roshchupkin Vladimir — Baikov Institute of Metallurgy and Materials Science of RAS (119334 Moscow, Leninskiy prospect, 49), Dr.Sci. (Eng.), professor, head of laboratory, specialist in the field of thermophysics, materials science and molecular acoustics. E-mail: vvro@mail.ru.
Lyakhovitskii Mark — Baikov Institute of Metallurgy and Materials Science of RAS (119334 Moscow, Leninskiy prospect, 49), PhD, senior researcher, specialist in the field of thermophysics, materials science and molecular acoustics. E-mail: mark.oldmark@gmail.com.
Pokrasin Mikhail — Baikov Institute of Metallurgy and Materials Science of RAS (119334 Moscow, Leninskiy prospect, 49), PhD, leading research worker, specialist in the field of thermophysics, materials science and molecular acoustics. E-mail: pokrasin@gmail.com.
Minina Natalia — Baikov Institute of Metallurgy and Materials Science of RAS (119334 Moscow, Leninskiy prospect, 49), senior researcher, specialist in the field of thermophysics and materials science. E-mail: minina@imet.ac.ru.
Kudriavtsev Evgeniy — Baikov Institute of Metallurgy and Materials Science of RAS (119334 Moscow, Leninskiy prospect, 49), specialist in the field of materials science and molecular acoustics. E-mail: kudriavt@sci.lebedev.ru.
Reference citing
Roshchupkin V. V., Lyakhovitskii M. M., Pokrasin M. A., Minina N. A., Kudryavtsev E. M. Eksperimental'noe issledovanie akusticheskih svojstv i mikrotverdosti stali 45 [Experimental study of acoustic properties and microhardness of 45-type steel]. Perspektivnye Materialy — Advanced Materials (in Russ), 2018, no. 3, pp. 72 – 78.
DOI: 10.30791/1028-978X-2018-3-72-78.
