Flame retardant polyolefins
Yu. M. Evtushenko, Yu. A. Grigoriev, T. A. Rudakova
Various approaches to increase the fire resistance of composite materials based on polyolefins and their influence on various properties of composites are presented. The possible mechanisms of reducing the flammability of polymers are considered. The fire resistance of the polymer composite material can be increased either by increasing the fire resistance of the components of the composite materials, or by forming a fire-retardant coating, which in the event of a fire can form a swollen layer of the products of decomposition – char, which prevents the access of oxygen and heat flow to the substrate. The results of studies of composite materials based on polyolefins using different types of flame retardants were analyzed. Optimization of the composition of flame retardants for polymers and fire-retardant coatings, their modification and the search for symbate effects from the use of various additives are currently the main areas of research. Considerable attention is paid to the development of environmentally friendly flame retardants, along with improving their efficiency. At the same time, a certain limit of creation of fire retardant materials on the basis of existing chemical and physical methods has already been reached, so it is necessary to search for and develop new ideas to reduce the combustibility of polymers.
Keywords: polyolefins, combustion, fire protection, flame retardants, thermal destruction.
DOI: 10.30791/1028-978X-2019-5-5-14
Evtushenko Yuri — Enikolopov Institute of synthetic polymeric materials (Moscow, 117393, Profsoyuznaya, 70), Dr Sci (Chem), senior researcher, specialist in the field of fire protection and the fire-resistant composite materials. E-mail: evt-yuri@mail.ru.
Grigoriev Yuri — Enikolopov Institute of synthetic polymeric materials (117393, Moscow, Profsoyuznaya, 70), researcher, specialist in the field of combustion of polymer materials and the development of compositions for fire protective coatings and flame retardant composite materials. E-mail: ggricha@mail.ru.
Rudakova Tatyana — Enikolopov Institute of synthetic polymeric materials (117393, Moscow, Profsoyuznaya, 70), PhD (Chem), senior researcher, specialist in the field of combustion of polymer materials and the development of compositions for fire-protective coatings. E-mail: tetrudakova@yandex.ru.
Reference citing
Evtushenko Yu. M., Grigoriev Yu. A., Rudakova T. A. Poliolefiny ponizhennoj goryuchesti [Flame retardant polyolefins]. Perspektivnye Materialy — Advanced Materials (in Russ), 2019, no. 5, pp. 5 – 14. DOI: 10.30791/1028-978X-2019-5-5-14
Effect of low-temperature ion irradiation
on the nanostructure
of 12% chromium ChS-139 steel
S. V. Rogozhkin, N. A. Iskandarov, A. A. Nikitin, A. A. Bogachev,
A. A. Khomich, V. V. Khoroshilov, A. A. Lukyanchuk,
O. A. Raznitsyn, A. S. Shutov, P. A. Fedin,
T. V. Kulevoy, M. V. Leontyeva-Smirnova, E. M. Mozhanov
Specimens of ChS-139 steel (0,2 С – 12 Cr – Ni – Mo – W – Nb – V – N – B) were irradiated up to 6 dpa with Fe ions at 250, 300 and 400 °C. Radiation-induced clusters and Cottrell atmospheres enriched in Ni, Si, and Mn were revealed in irradiated samples by atom probe tomography. The typical sizes of these clusters were about 2 – 7 nm, and their number density was ~ (2 – 20)·1023 m–3. Analysis of the irradiation temperature effect showed that the radiation-induced clusters had the most lower enrichment of clusters in Ni, Si, and Mn, the more large average size of ~ 5 nm, and the more small number density of ~ 2·1023 m–3 at the more high temperature of 400 °С. A noticeable decrease in the number density of radiation-induced clusters with an increase in the radiation dose to 4 dpa at 300 °C was found. Concerning a large amount of nanoclusters (~ 1023 m–3) enriched in Cr, V, Nb, and N detected in unirradiated ChS-139 steel, it was shown the low-temperature irradiation leaded to dissolution of these clusters. The magnitude of detected radiation induced effects indicates evident contribution of them to low temperature radiation embrittlement of ChS-139 steel.
Keywords: ferritic-martensitic steels, radiation-induced clusters, ion irradiation, atom probe tomography.
DOI: 10.30791/1028-978X-2019-5-15-27
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), Dr Sci (Phys-Math), head of department, specialist in condensed matter physics. E-mail: sergey.rogozhkin@itep.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), senior researcher, specialist in ultramicroscopy and materials science. E-mail: aleksandr.nikitin@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.
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.
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), engineer, 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.
Fedin Peter — 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 particle accelerator physics. E-mail: Fedin-Petr1991@yandex.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, specialist in particle accelerator physics. E-mail: kulevoy@itep.ru.
Leontyeva-Smirnova Mariya — Stock Company “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 — Stock Company “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.
Reference citing
Rogozhkin S. V., Iskandarov N. A., Nikitin A. A., Bogachev A. A., Khomich A. A., Khoroshilov V. V., Lukyanchuk A. A., Raznitsyn O. A., Shutov A. S., Fedin P. A., Kulevoy T. V., Leontyeva-Smirnova M. V., Mozhanov E. M. Perestrojka nanostruktury 12 %-j hromistoj stali CHS-139 pri nizkotemperaturnom obluchenii ionami [Effect of low-temperature ion irradiation on the nanostructure of 12 % chromium ChS-139 steel]. Perspektivnye Materialy — Advanced Materials (in Russ), 2019, no. 5, pp. 15 – 27. DOI: 10.30791/1028-978X-2019-5-15-27
Stereolithography 3D-printing of bioceramic scaffolds of a given shape and architecture for bone tissue regeneration
V. I. Putlyaev, P. V. Yevdokimov, S. A. Mamonov, V. N. Zorin,
Ye. S. Klimashina, I. A. Rodin, T. V. Safronova, A. V. Garshev
A range of ceramic scaffolds of different sizes and shapes for bone tissue regeneration with Kelvin architecture was developed, providing matrix permeability of at least 900 Darcy in water and relative rigidity of matrices of no more than 0.2. The possibility of manufacturing bioceramic scaffolds using stereolithography 3D-printing of light-cured slurries containing mixed calcium-sodium phosphate of composition Ca2.5Na (PO4)2 has been demonstrated. A technological scheme for the production of bioceramic scaffolds has been developed and tested, including the development of photocurable slurries; 3D-printing regimes are also worked out. The heat treatment schedules of the printed models were worked out along with the development of the sintering mode. The worked-out modes of stereolithography molding and subsequent heat treatment of the printed models make it possible to manufacture ceramic scaffolds with a lateral resolution of no worse than 50 μm and a 50 μm in a layer-by-layer direction. The dimensions of the bioceramic scaffolds differ from the given dimensions of the original models by no more than 10 %; with a fraction of macropores of at least 70 % and pore size of 500 microns. It was shown that manufactured bioceramic scaffolds are compatible with human fibroblast cell cultures, are not cytotoxic, do not contain components that impede adhesion, spreading and proliferation of fibroblasts and can be used in tissue engineering works.
Keywords: bioceramics, calcium phosphates, stereolithography 3D-printing,
macropores, osteoconductivity, Kelvin structure.
DOI: 10.30791/1028-978X-2019-5-28-40
Putlayev Valery — Lomonosov Moscow State University, Chemistry Department (119991, Moscow, Leninskie Gory, 1, bd.3, GSP-1, MSU), PhD (Chem), assoc. professor, expert in chemistry of inorganic materials. E-mail: valery.putlayev@gmail.com.
Evdokimov Pavel — Lomonosov Moscow State University, Chemistry Department (119991, Moscow, Leninskie Gory, 1, bd.3, GSP-1, MSU), junior researcher, PhD (Chem), expert in chemistry of inorganic materials. E-mail: pavel.evdokimov@gmail.com.
Mamonov Sergey — Federal State Unitary Enterprise “Experimental Production Workshops” of the Federal Medical and Biological Agency of Russia (123182, Moscow, ul. Shchukinskaya, d. 5, str. 2), director, expert in biomedical testing of materials. E-mail: mamonov@nic-itep.ru.
Zorin Valentin — Federal State Unitary Enterprise “Experimental Production Workshops” of the Federal Medical and Biological Agency of Russia (123182, Moscow, ul. Shchukinskaya, d. 5, str. 2), director of the project, expert in biomedical testing of materials. E-mail: vzorin1@yandex.ru.
Klimashina Elena — Lomonosov Moscow State University, Chemistry Department (119991, Moscow, Leninskie Gory, 1, bd.3, GSP-1, MSU), PhD (Chem), research worker, expert in chemistry of inorganic materials. E-mail: klimashina@inorg.chem.msu.ru.
Rodin Igor — Lomonosov Moscow State University, Chemistry Department (119991, Moscow, Leninskie Gory, 1, bd.3, GSP-1, MSU), Dr Sci (Chem), senior researcher, expert in analytical chemistry. E-mail: igorrodin@yandex.ru.
Safronova Tatiana — Lomonosov Moscow State University, Chemistry Department (119991, Moscow, Leninskie Gory, 1, bd.3, GSP-1, MSU), PhD (Eng), senior researcher, senior researcher, expert in chemistry and technology of inorganic materials. E-mail:
t3470641@yandex.ru.
Garshev Alexey — Lomonosov Moscow State University, Chemistry Department (119991, Moscow, Leninskie Gory, 1, bd.3, GSP-1, MSU), PhD (Chem), leading researcher, expert in analysis of inorganic materials. E-mail: garshev@inorg.chem.msu.ru.
Reference citing
Putlyaev V. I., Yevdokimov P. V., Mamonov S. A., Zorin V. N., Klimashina Ye. S., Rodin I. A., Safronova T. V., Garshev A. V. Stereolitograficheskaya 3D-pechat' biokeramicheskih matriksov zadannoj formy i arhitektury dlya regeneracii kostnoj tkani [Stereolithography 3D-printing of bioceramic scaffolds of a given shape and architecture for bone tissue regeneration]. Perspektivnye Materialy — Advanced Materials (in Russ), 2019, no. 5, pp. 28 – 40. DOI: 10.30791/1028-978X-2019-5-28-40
Effect of ceramic samples based on t-ZrO2
on the condition of muscular and connecting tissues of experimental animals with intrainal introduction
N. Yu. Kovalko, M. V. Kalinina, D. N. Suslov, O. V. Galibin,
G. Yu. Yukina, M. Yu. Arsentyev, O. A. Shilova
A highly dispersed powder (9 – 10 nm) was synthesized by the method of co-precipitation of hydroxides from salt solutions on the basis of a tetragonal solid solution of partially stabilized zirconia (t-ZrO2). On its basis, nanocrystalline ceramics (grain size 60 – 70 nm) with high physico-chemical and mechanical characteristics was obtained: the tetragonality degree c/a is 1.438 – 1.431, the flexural strength is 900 – 1000 MPa, the Vickers hardness 13 – 14 GPa, crack resistance 10 – 11 MPa∙m1/2. The ceramic implant obtained was placed into the body of experimental animals. In this work, the reaction of soft tissues of experimental animals to the introduction of plates from a ceramic material based on zirconia was studied. The conducted studies showed the absence of toxic effect of the ceramic implant based on t-ZrO2 on the tissues surrounding the implant and the organism of laboratory animals in the period from 30 to 195 days from the moment of implantation. The results of studies in in vivo conditions allow us to state that the obtained nanoscale bioceramics can be used in restorative dentistry and endoprosthetics as dental implants, endoprostheses and fragments of bones for transplantology.
Keywords: method of coprecipitation of hydroxides, xerogels, powders, bioceramics based on t-ZrO2, in vivo studies, medicine, implants.
DOI: 10.30791/1028-978X-2019-5-41-49
Koval’ko Nadezhda — Grebenschikov Institute of Silicate Chemistry of Russian Academy of Sciences (199034, Saint-Petersburg, Makarova naberezhnaya 2), junior researcher, specialists in the field of synthesis and physicochemical properties of nanocrystalline oxide materials. E-mail: kovalko.n.yu@gmail.com.
Kalinina Marina — Grebenschikov Institute of Silicate Chemistry of Russian Academy of Sciences (199034, Saint-Petersburg, Makarova naberezhnaya 2), PhD (Chem), senior researcher, specialist in physical and chemical properties of nanocrystalline oxide materials. E-mail: tikhonov_p-a@mail.ru.
Suslov Dmitrii — Russian scientific center of radiology and surgical technologies named after acad. A.M. Granov, Ministry of Health of RF (197758, St. Petersburg, pos. Pesochnyi, Leningradskaya str., 70), PhD (Med), leading researcher, specialist in the field of experimental research. E-mail: dn_suslov@rrcrst.ru.
Galibin Oleg — Pavlov First Saint Petersburg State Medical University (197022,
Saint Petersburg, L’va Tolstogo str. 6-8), Dr Sci (Med), professor, head of biotechnology department, specialist in the field of experimental research. E-mail: ogalibin@mail.ru.
Yukina Galina — Pavlov First Saint Petersburg State Medical University (197022,
Saint Petersburg, L’va Tolstogo str. 6-8), PhD, associated professor, head of the laboratory of pathomorphology, specialist in the field of morphology. E-mail: pipson@inbox.ru.
Arsent’ev Maxim — Grebenschikov Institute of Silicate Chemistry of Russian Academy of Sciences (199034, Saint-Petersburg, Makarova naberezhnaya 2), PhD (Chem), senior researcher, specialist in the field of X-ray diffraction analysis. E-mail:
ars21031960@gmail.com.
Shilova Olga — Grebenschikov Institute of Silicate Chemistry of Russian Academy of Sciences (199034, Saint-Petersburg, Makarova naberezhnaya 2), Dr Sci (Chem), professor, chief researcher, acting head of the Laboratory of inorganic synthesis, specialist in the field of physical chemistry and technology of glass-ceramic nanocomposite materials. E-mail: olgashilova@bk.ru.
Reference citing
Kovalko N. Yu., Kalinina M. V., Suslov D. N., Galibin O. V., Yukina G. Yu., Arsentyev M. Yu., Shilova O. A. Issledovanie vliyaniya biokeramicheskih obrazcov na osnove t-ZrO2 na sostoyanie myshechnoj i soedinitel'noj tkanej eksperimental'nyh zhivotnyh pri vnutrimyshechnom vvedenii [Effect of ceramic samples based on t-ZrO2 on the condition of muscular and connecting tissues of experimental animals with intrainal introduction]. Perspektivnye Materialy — Advanced Materials (in Russ), 2019, no. 5, pp. 41 – 49. DOI: 10.30791/1028-978X-2019-5-41-49
Physical and chemical properties of polyporphyrene films based on the Mn-complexes of amino-substituted tetrafenylporfin
M. V. Tesakova, A. V. Balmasov, V. I. Parfenyuk
The article presents the results of the study of electrochemical deposition and the physicochemical properties of porphyrin films deposited on glassy carbon, platinum and ITO electrodes. Electropolymerization of Mn(III) chloride 5,10,15,20-tetrakis(3-aminophenyl)porphyrin from different solvents and in different deposition modes has been carried out. In the process of electrooxidation of porphyrin monomer in solutions of dichloromethane and ethanol, polyporphyrin films are formed on the working electrode in the potential range from 0 to +2 V. The electropolymerization process was studied using the quartz microbalance method. The physico-chemical properties of the films were studied using various methods: UV-VIS spectrophotometry, IR spectroscopy, scanning electron microscopy, atomic force microscopy, photo-EMF method. The number of electrons participating in the electropolymerization process is determined. Spectral methods have shown that a porphyrin structure is retained in the film and in the process of electropolymerization possible to incorporate μ-oxodimers into the composition of the film. It was found that the obtained polyporphyrin films possess semiconductor properties.
Keywords: polyporphyrin films, electropolymerization, semiconductor properties.
DOI: 10.30791/1028-978X-2019-5-50-60
Tesakova Mariya — G.A. Krestov Institute of Solution Chemistry of Russian Academy of Science (Akademicheskaya 1, Ivanovo, 153045, Russia), PhD, researcher, specialist in electrochemistry and material science. E-mail: mvt@isc-ras.ru.
Balmasov Anatoliy — Ivanovo State University of Chemistry and Technology (Sheremetevsky Avenue 7, Ivanovo, 153000, Russia), Dr Sci (Eng), professor, specialist in electrodeposition of metals and alloys. E-mail: balmasov@isuct.ru.
Parfenyuk Vladimir — G.A. Krestov Institute of Solution Chemistry of Russian Academy of Science (Akademicheskaya 1, Ivanovo, 153045, Russia), Dr Sci (Chem), professor, main scientist, specialist in chemistry of materials. E-mail: vip@isc-ras.ru.
Reference citing
Tesakova M. V., Balmasov A. V., Parfenyuk V. I. Fiziko-himicheskie svojstva poliporfirinovyh plenok na osnove margancevogo kompleksa amino-zameshchennogo tetrafenilporfina [Physical and chemical properties of polyporphyrene films based on the Mn-complexes of amino-substituted tetrafenylporfin]. Perspektivnye Materialy — Advanced Materials (in Russ), 2019, no. 5, pp. 50 – 60. DOI: 10.30791/1028-978X-2019-5-50-60
Research of titanium saturation by gas
and feature of ceramic layer formation using
the oxidative constructing approach
V. Yu. Zufman, A. V. Shokodko, I. A. Kovalev, A. A. Ashmarin,
A. I. Ogarkov, N. A. Ovsyannikov, A. A. Klimov, S. N. Klimaev,
G. P. Kochanov, E. A. Shokodko, A. A. Chesnokov,
A. S. Chernyavskii, K. A. Solntsev
Samples made of titanium grade BT 1–0 in the form of disks were subjected to isothermal aging at 875 °C with access to atmospheric air for 2, 4, 6, 7, and 13 days. As a result of XRD, it was established that the oxide layer is rutile TiO2. The metal blank absorbs oxygen and nitrogen from atmospheric air, which are concentrated in the surface layer. The increase in the mass of oxygen going to the formation of rutile, is 96 – 98 % wt. of the total amount of gas absorbed. The rest of the absorbed gas
(2 – 4 wt. %) is contained in the metal blank in the form of solid solutions. The gas absorption rate of a tita-nium blank is proportional to the rate of rutile formation. The process kinetics for each of the sample surfaces (side and end), which is described by an exponential law, is determined. At the initial stage of the oxidation process, the surface ge-ometry does not affect the rate of formation of the ceramic layer of rutile; in the future, there is an “acceleration” of rutile growth on the end surface.
Keywords: titanium, rutile, oxidative constructing, ceramics, kinetics, structure.
DOI: 10.30791/1028-978X-2019-5-61-69
Zufman Valerii — Baikov Institute of Metallurgy and Materials Science RAS (49 Leninskii pr., Moscow 119334), junior researcher, expert in the field of materials science and inorganic chemistry. E-mail: vzufman@imet.ac.ru.
Shokodko Aleksandr — Baikov Institute of Metallurgy and Material Science RAS (49 Leninskii pr., Moscow 119334), PhD, research assistant, expert in the field of materials science and inorganic chemistry. E-mail: ashokodko@imet.ac.ru.
Kovalev Ivan — Baikov Institute of Metallurgy and Material Science RAS (49 Leninskii pr., Moscow 119334), PhD, research assistant, expert in the field of materials science and inorganic chemistry. E-mail: ikovalev@imet.ac.ru.
Ashmarin Artem — Baikov Institute of Metallurgy and Material Science RAS (49 Leninskii pr., Moscow 119334), PhD, senior research, specialist in the field of X-ray analysis and materials science. E-mail: aashmarin@imet.ac.ru.
Ogarkov Aleksandr — Baikov Institute of Metallurgy and Material Science RAS (49 Leninskii pr., Moscow 119334), junior researcher, expert in the field of materials science and inorganic chemistry. E-mail: aogarkov@imet.ac.ru.
Ovsyannikov Nikolai — Baikov Institute of Metallurgy and Material Science RAS
(49 Leninskii pr., Moscow 119334), PhD, senior research, expert in the field of materials science and inorganic chemistry. E-mail: novsyannikov@imet.ac.ru.
Klimov Aleksandr — LLC “Aurora Borealis” (42, str. 1 bul’var Bolshoy, the territory of the innovation center Skolkovo, Moscow 121205), CEO, specialist in high-temperature disposal of various classes of waste. E-mail: aogarkov@imet.ac.ru.
Klimaev Stanislav — Baikov Institute of Metallurgy and Material Science RAS (49 Leninskii pr., Moscow 119334), junior researcher, expert in the field of materials science and inorganic chemistry. E-mail: sklimaev@imet.ac.ru.
Kochanov German — Baikov Institute of Metallurgy and Material Science RAS (49 Leninskii pr., Moscow 119334), junior researcher, expert in the field of materials science and inorganic chemistry. E-mail: gkochanov@imet.ac.ru.
Shokodko Ekaterina — National Research Moscow State University of Civil Engineering (26 Yaroslavskoye shosse, Moscow 129337), PhD, senior lecturer, expert in the field of materials science. E-mail: aogarkov@imet.ac.ru.
Chesnokov Artem — Baikov Institute of Metallurgy and Material Science RAS (49 Leninskii pr., Moscow 119334), research engineer, expert in the field of materials science. E-mail: aogarkov@imet.ac.ru.
Chernyavskii Andrei — Baikov Institute of Metallurgy and Material Science RAS (49 Leninskii pr., Moscow 119334), PhD, leading researcher, expert in the field of materials science and inorganic chemistry. E-mail: aschernyavskiy@imet.ac.ru.
Solntsev Konstantin — Baikov Institute of Metallurgy and Material Science RAS (49 Leninskii pr., Moscow 119334), Dr. Sci. (Chem.), professor, academician of RAS, scientific director of the Institute, expert in the field of materials science and inorganic chemistry. E-mail: ksolntsev@imet.ac.ru.
Reference citing
Zufman V. Yu., Shokodko A. V., Kovalev I. A., Ashmarin A. A., Ogarkov A. I.,
Ovsyannikov N. A., Klimov A. A., Klimaev S. N., G. P. Kochanov, Shokodko E. A., Chesnokov A. A., Chernyavskii A. S., Solntsev K. A. Issledovanie gazonasyshcheniya titana i osobennosti formirovaniya keramicheskogo sloya v ramkah podhoda okislitel'nogo konstruirovaniya [Research of titanium saturation by gas and feature of ceramic layer formation using the oxidative constructing approach]. Perspektivnye Materialy — Advanced Materials (in Russ), 2019, no. 5, pp. 61 – 69. DOI: 10.30791/1028-978X-2019-5-61-69
Combined method of obtaining the dense nanoceramics
based on alumina
L. V. Morozova, I. A. Drozdova
The technology of producing dense aluminum oxide ceramics with the use of a modifying additive and mechanochemical activation (MA) of the outcome reagent was developed. The feasibility of using MA for the synthesis of dispersed powder precursors based on g-Al2O3 at 600 °C and reducing the temperature of the a-Al2O3 phase formation from 1200 to 1000 °C is shown. The influence of MA on the relative density of aluminum oxide ceramics during sintering in the temperature range of 1000 – 1500 °C was revealed, the most active process of sintering occurs at temperatures of 1000 – 1300 °С. It was found that the presence of МgO in the aluminum oxide matrix in an amount of 1 to 3 wt. % slows down the growth of a-Al2O3 grains due to the formation of a boundary layer of MgAl2O4 nanocrystallites in the aluminum oxide matrix. A ceramic material based on a-Al2O3 with an average grain size of ~ 70 nm, a relative density of 0.98, a microhardness of 25 GPA and a bending strength of 650 MPa was obtained. The proposed combined method is simple and economical for the production of high-density aluminum oxide ceramics with a grain size of less than 100 nm and high physical and mechanical properties, which can be used to create materials of various structural and functional purposes.
Keywords: aluminum oxide, mechanochemical activation, dispersion, sintering, nanoceramics.
DOI: 10.30791/1028-978X-2019-4-70-80
Morozova Ludmila — Grebenshchikov Institute of Silicate Chemistry of RAS (Makarov
emb. 2, St.-Petersburg, 199155 Russia), PhD, senior researcher, specialists in the field of physical chemistry and methods of synthesis of oxide nanomaterials. E-mail:
morozova_l_v@mail.ru.
Drozdova Irina — Grebenshchikov Institute of Silicate Chemistry of RAS (Makarov emb. 2, St.-Petersburg, 199155 Russia), senior researcher, specialists in the field of electron spectroscopy of oxide materials. E-mail: i-drozd@list.ru.
Reference citing
Morozova L. V., Drozdova I. A. Kombinirovannyj metod polucheniya plotnoj nanokeramiki na osnove oksida alyuminiya [Combined method of obtaining the dense nanoceramics based on alumina]. Perspektivnye Materialy — Advanced Materials (in Russ), 2019, no. 5, pp. 70 – 80. DOI: 10.30791/1028-978X-2019-4-70-80
