Begell House Inc.
High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes
HTM
1093-3611
23
4
2019
NUMERICAL SIMULATION OF BENZENE HIGH-TEMPERATURE PYROLYSIS
291-302
10.1615/HighTempMatProc.2019033024
Anatoly M.
Tereza
N.N. Semenov Federal Research Center for Chemical Physics, Russian Academy
of Sciences, Kosigina Str. 4, Moscow, 119991, Russia
G. L.
Agafonov
N.N. Semenov Federal Research Center for Chemical Physics, Russian
Academy of Sciences, Moscow, Russia
Enes K.
Anderzhanov
N.N. Semenov Federal Research Center for Chemical Physics, Russian Academy
of Sciences, Kosigina Str. 4, Moscow, 119991, Russia
N. Y.
Vasilik
N.N. Semenov Federal Research Center for Chemical Physics, Russian
Academy of Sciences, Moscow, Russia
Sergey P.
Medvedev
N.N. Semenov Federal Research Center for Chemical Physics, Russian Academy
of Sciences, Kosigina Str. 4, Moscow, 119991, Russia
S. V.
Khomik
N.N. Semenov Federal Research Center for Chemical Physics, Russian Academy
of Sciences, Kosigina Str. 4, Moscow, 119991, Russia
N. A.
Brykov
Baltic State Technical University "VOENMEH", St. Petersburg, Russia
pyrolysis
benzene
chemical kinetics
numerical simulation
The paper examines experimental data presented in the literature on benzene pyrolysis obtained by various registration methods for the consumption of benzene itself and the yield of its products. The temperature ranged from 900 to 2200 K and the pressure ranged from 0.04 to 5 MPa. Numerical modeling was carried out using a number of different detailed kinetic mechanisms (DKM), as presented in the literature. In different temperature ranges, it was demonstrated that numerical simulations using different DKMs present different results. The temperature range and the corresponding DKMs are determined by the results of numerical modeling when their usage coincides most closely with the experimental data. It is determined that the DKMs presented in the literature are only able to qualitatively describe the experimental data at 5 MPa.
INFLUENCE OF TEMPERATURE ON HIGH-FIELD INJECTION MODIFICATION OF MIS STRUCTURES WITH THERMAL SiO2 FILMS DOPED WITH PHOSPHORUS
303-312
10.1615/HighTempMatProc.2019031840
Dmitrii V.
Andreev
N.E. Bauman Moscow State Technical University, Kaluga Branch, 2 Bazhenov
Str., Kaluga, 248000, Russia
Gennady G.
Bondarenko
National Research University Higher School of Economics, 20 Myasnitskaya
Str., Moscow, 101000, Russia
Vladimir V.
Andreev
Bauman Moscow State Technical University, The Kaluga Branch,
2 Bazhenov Str., Kaluga, 248000, Russia
Vladimir M.
Maslovsky
Department of Micro- and Nanoelectronics, Moscow Institute of Physics and Technology (State University), 9 Institutskii Lane, Dolgoprudnyi, Moscow Region, 141700 Russia
Alexander A.
Stolyarov
N.E. Bauman Moscow State Technical University, Kaluga Branch, 2 Bazhenov
Str., Kaluga, 248000, Russia
MIS structure
thin films
high fields
modification of gate dielectric
silicone dioxide
phosphosilicate glass
The paper presents a study of the processes of electron trapping in metal-insulator-semiconductor (MIS) structures with gate dielectric based on silicone dioxide doped with phosphorus under high-field Fowler−Nordheim tunnel injection of electrons in a range of temperatures from 293 to 373 K. We have ascertained that the negative charge being trapped in phosphosilicate glass (PSG) consisted of two components with a different energy of the thermal ionization ΔEa1 = 0.2-0.3 eV and ΔEa2 = 1.0-1.2 eV. A part of the charge with a low energy of the thermal ionization virtually drain off at annealing temperature of 473 K for a period of time of 20 min and then the dielectric contains only the thermostable part of the negative charge that can be utilized to correct the threshold voltage of MIS transistors. We have ascertained that an implementation of the high-field tunnel injection of electrons for MIS structures with SO2-PSG gate dielectric has raised not only density of negative charge trapped but also its thermostable component.
SIMULATION OF ANNEALING AND THE ELDRS IN p-MNOS RadFETs
313-318
10.1615/HighTempMatProc.2019031964
Elizaveta V.
Mrozovskaya
National Research Nuclear University MEPhI, Moscow, Russia
Petr A.
Zimin
National Research Nuclear University MEPhI, Moscow, Russia
Pavel A.
Chubunov
National Research Nuclear University MEPhI, Moscow, Russia
Gennady I.
Zebrev
National Research Nuclear University MEPhI, 31 Kashirskoye Highway, Moscow, 115409, Russia
Vladimir M.
Maslovsky
Department of Micro- and Nanoelectronics, Moscow Institute of Physics and Technology (State University), 9 Institutskii Lane, Dolgoprudnyi, Moscow Region, 141700 Russia
RadFET
ELDRS
radiation effects in devices
total dose effects
dose rate effects
dosimeter
simultaneous annealing
The manifestation of simultaneous annealing in p-MNOS (metal-nitride-oxide-semiconductor) samples with thick oxide and a pronounced effect of enhanced low-dose-rate sensitivity (ELDRS) are investigated. The simulation was based on experimental data.
DISPERSED PHASE VELOCITY IN A HIGH-TEMPERATURE GAS FLOW
319-328
10.1615/HighTempMatProc.2019030506
Dmitry V.
Nesterovich
A.V. Luikov Heat and Mass Transfer Institute, National Academy of Sciences
of the Republic of Belarus, 15 P. Brovka Str., Minsk, 220072, Belarus
Oleg G.
Penyazkov
A.V. Luikov Institute of Heat and Mass Transfer, Belorussian Academy of Sciences, 15 P. Brovka Str., Minsk, 220072, Belarus
Yu. A.
Stankevich
A.V. Luikov Heat and Mass Transfer Institute, National Academy of Sciences
of the Republic of Belarus, 15 P. Brovka Str., Minsk, 220072, Belarus
M. S.
Tretyak
A.V. Luikov Heat and Mass Transfer Institute, National Academy of Sciences
of the Republic of Belarus, 15 P. Brovka Str., Minsk, 220072, Belarus
Vladimir V.
Chuprasov
A.V. Luikov Heat and Mass Transfer Institute, National Academy of Sciences
of the Republic of Belarus, 15 P. Brovka Str., Minsk, 220072, Belarus
Ilya N.
Shatan
A.V. Luikov Heat and Mass Transfer Institute, National Academy of Sciences of Belarus, 15 P. Brovka Str., Minsk, 220072, Republic of Belarus
dispersed phase
plasma torch
heterogeneous flow
heat-shielding material
nozzle
plasmatron
At the present stage of space research, one of the most important tasks is the experimental study of heat-shielding materials of a descent spacecraft in conditions of strong dustiness of the atmosphere. To study the physicochemical processes occurring on the surface of a heat-shielding material, when modeling the entry of a spacecraft into the planet's atmosphere, it is necessary to create hypersonic high-enthalpy heterogeneous flows with constant monitoring of gas-dynamic parameters. The aim of this work was to obtain the maximum possible velocity of the heterogeneous phase at the Luch-22 setup, which is based on the electric-arc gas heater of a linear scheme with magnetogas-dynamic stabilization of the jet. A numerical simulation was carried out to determine the output nozzle geometry and the position for injection the dispersed phase into the main flow. As a dispersed phase, SiO2 particles with a determining diameter of 14.2 μ;m were used. A high-speed CCD camera with image intensifier with flash synchronization of a two-pulse Nd:YAG laser with Q-switching was used to record the velocity of particles in the plasma torch stream. Experimental results showed that with the selected geometry of the nozzle block and the position of the injection channel of particles, the velocity of the dispersed phase in the flow reaches 2200-2300 m/s. It is shown that when designing a nozzle unit, it is necessary to take into account the size and material of the particles of the dispersed phase.
THERMAL AND EROSIVE INFLUENCE OF A HETEROGENEOUS JET ON THE SURFACE OF A HEAT-SHIELDING MATERIAL
329-336
10.1615/HighTempMatProc.2019031212
Valiantsin M.
Astashynski
A.V. Luikov Heat and Mass Transfer Institute, National Academy of Sciences
of Belarus, 15 P. Brovka Str., Minsk, 220072, Belarus; National Research Nuclear University "MEPhI" (Moscow Engineering Physics Institute), 31 Kashirskoe Highway, Moscow, 115409, Russia
O. F.
Lupsyakova
A.V. Luikov Heat and Mass Transfer Institute, National Academy of Sciences
of Belarus, 15 P. Brovka Str., Minsk, 220072, Belarus
A. A.
Prismotrov
A.V. Luikov Heat and Mass Transfer Institute, National Academy of Sciences
of Belarus, 15 P. Brovka Str., Minsk, 220072, Belarus
Yu. A.
Stankevich
A.V. Luikov Heat and Mass Transfer Institute, National Academy of Sciences
of the Republic of Belarus, 15 P. Brovka Str., Minsk, 220072, Belarus
M. S.
Tretyak
A.V. Luikov Heat and Mass Transfer Institute, National Academy of Sciences
of the Republic of Belarus, 15 P. Brovka Str., Minsk, 220072, Belarus
Vladimir V.
Chuprasov
A.V. Luikov Heat and Mass Transfer Institute, National Academy of Sciences
of the Republic of Belarus, 15 P. Brovka Str., Minsk, 220072, Belarus
plasmatron
heat flux
supersonic heterogeneous jet
particle
rate of ablation
erosion
The results of an experimental study of the heat and erosion influence of a supersonic plasma heterogeneous jet on the surface of a heat-shielding material at an angle of 25° to the axis of the jet are presented. It is shown that in two-phase flows the mass destruction rate of fluoroplastic and textolite samples increases by 2-3 times.
SYNTHESIS, CRYSTAL STRUCTURE, AND MAGNETIC PROPERTIES OF LANTHANUM-STRONTIUM MANGANITES CONTAINING NICKEL IONS
337-344
10.1615/HighTempMatProc.2019032268
Nina
Tereshko
Scientific-Practical Materials Research Center of NAS of Belarus,
19 P. Brovka Str., Minsk, 220072, Belarus
Maxim
Bushinsky
Scientific-Practical Materials Research Center of NAS of Belarus,
19 P. Brovka Str., Minsk, 220072, Belarus
Olga
Mantytskaya
Scientific-Practical Materials Research Center of NAS of Belarus,
19 P. Brovka Str., Minsk, 220072, Belarus
Vera
Fedotova
Scientific-Practical Materials Research Center of NAS of Belarus,
19 P. Brovka Str., Minsk, 220072, Belarus
Joaquim Manuel
Vieira
Department of Materials & Ceramic Engineering & CICECO Institute
of Materials, Aveiro University, Portugal
Vitalii A.
Bondariev
Department of Electrical Devices and High Voltage Technology, Lublin University of Technology, 38D Nadbystrzycka Str., Lublin 20-001,
Poland
crystal structure
magnetic structure
magnetization
magnetic interactions
The aim of this work is to understand the properties of manganites doped with nickel ions. The influence of different synthesis conditions on the crystal and magnetic structure as well as magnetic properties of the compositions of the La1-xSrxMn0.65Ni0.35O3 system (0 ≤ x ≤ 0.3) are investigated. It is suggested that antiferromagnetism in the composition with x = 0.3 is associated with strong negative exchange interactions Ni2+−O−Ni2+ and Mn4+−O−Mn4+ and the ions disordering.
SCIENTIFIC AND TECHNOLOGICAL PRINCIPLES FOR DEPOSITION OF SELF-FLUXING COMPOSITE THERMAL COATINGS MODIFIED BY SOLID REFRACTORY COMPOUNDS AND PULSED HIGH-ENERGY EFFECTS
345-364
10.1615/HighTempMatProc.2020032929
A. Ph.
Ilyuschenko
O.V. Roman Powder Metallurgy Institute, National Academy of Sciences of
Belarus, 41 Platonov Str., Minsk, 220005, Belarus
A. I.
Shevtsov
O.V. Roman Powder Metallurgy Institute, National Academy of Sciences of
Belarus, 41 Platonov Str., Minsk, 220005, Belarus
Valiantsin M.
Astashynski
A.V. Luikov Heat and Mass Transfer Institute, National Academy of Sciences
of Belarus, 15 P. Brovka Str., Minsk, 220072, Belarus; National Research Nuclear University "MEPhI" (Moscow Engineering Physics Institute), 31 Kashirskoe Highway, Moscow, 115409, Russia
Anton M.
Kuzmitski
A. V. Luikov Heat and Mass Transfer Institute, National Academy of Sciences of Belarus, 15, P. Brovki Str, Minsk 220072, Belarus
A. N.
Chumakov
B. I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, 68 Nezavisimost Ave., Minsk, 220072, Belarus
Nikolay A.
Bosak
B. I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, 68 Nezavisimost Ave., Minsk, 220072, Belarus
A. I.
Letsko
O.V. Roman Powder Metallurgy Institute, National Academy of Sciences of
Belarus, 41 Platonov Str., Minsk, 220005, Belarus
Kiastas V.
Buikus
Belarusian National Technical University, 65 Nezavisimost Ave., Minsk, 220013, Belarus
G. F.
Gromyko
Institute of Mathematics, National Academy of Sciences of Belarus,
11 Surganov Str., Minsk, 220072, Belarus
T. A.
Leonova
O.V. Roman Powder Metallurgy Institute, National Academy of Sciences of
Belarus, 41 Platonov Str., Minsk, 220005, Belarus
scientific and technological bases
composite thermal coatings
self-fluxing alloy
solid refractory compounds
pulsed high-energy effects
wear resistance
Taking into account the results of the comprehensive research, the scientific and technological out-lines for deposition of composite NiCrBSi self-fluxing alloy-based thermal coatings with increased wear resistance modified with TiC carbides and processed by pulsed impacts of compression plasma jets and laser radiation have been developed. The NiCrBSi + 40%TiC thermal coatings deposited using the developed scientific and technological bases were subjected to tribotechnical tests.
EFFECT OF PRESSURE ON THERMODYNAMIC PROPERTIES OF CH4 THERMAL PLASMAS MIXED WITH H2
365-376
10.1615/HighTempMatProc.2020032931
S.
Askri
LEVRES Laboratory, University of El Oued, 39000, Algeria
A. Karim
Ferouani
LPT, Faculté des Sciences, Université A. Belkaid, 13000 Tlemcen, Algeria; Ecole Supérieure en Sciences Appliquées, ESSA-Tlemcen, Algeria
B.
Liani
LPT Laboratory, Université A. Belkaid, Faculté des Sciences, Département de Physique, 13000, Tlemcen, Algeria
S.
Ailas
LPT Laboratory, Université A. Belkaid, Faculté des Sciences, Département de Physique, 13000, Tlemcen, Algeria
E. H.
Guedda
LEVRES Laboratory, University of El Oued, 39000, Algeria
equilibrium compositions
thermal plasma
thermodynamic properties
Thermodynamic properties at high temperature in gases and/or in plasmas are very important in various fields, namely, in the field of breaking technology in arc, cutting plasma, welding or burning. Knowledge of thermodynamic coefficients is necessary for any modeling involving hydrodynamic equations. This paper is devoted to the calculation of thermodynamic properties of equilibrium compositions: mass density, enthalpy, and specific heat of methane (CH4) thermal plasmas mixed with hydrogen (H2). These data are computed in the temperature range 300−30,000 K and at various pressures (0.1-24) atm. The general results show that the infuence of the methane presence on the thermodynamic properties can be important in this temperature range.
OPTIMIZATION OF COATING THICKNESS FOR VARIOUS PROPERTIES OF COMPOSITE TYPE THERMAL BARRIER COATED WITH INCONEL 718 ALLOY
377-389
10.1615/HighTempMatProc.2020032992
Mohammed
Asadullah
Department of Mechanical Engineering, Methodist College of Engineering,
Hyderabad, India
Mohammed
Yunus
Department of Mechanical Engineering, College of Engineering and Islamic
Architecture, Umm Al-Qura University, Makkah, Al-Abdiah, 24231, Kingdom
of Saudi Arabia
thermal barrier coatings
yttria-stabilized zirconia
chromium oxides
atmospheric plasma spraying
bond coat
gas turbines
In the past, continuous improvements were made in the gas turbines field using several methods such as increasing the efficiency of reheating, regeneration, and intercooling stages. This required either high thermal resistant alloys or surface modification of conventional material. The latter method is inexpensive and effective. Thermal barrier coating is one surface modification methods for improving the performance of gas turbines. Various studies have been carried out either by taking different coating materials and their thicknesses, or by inmplementing different processes. In the current work, atmospheric plasma spray coating technique is used for depositing the ceramic material (8%YSZ−Cr2O3). The coating thickness is also varied by using different proportions of YSZ (yttria-stabilized zirconia) and Cr2O3 (chromium oxide) and analyzing various properties. The optimum thickness of coating is found from the experimental results for maximum temperature gradient across the material to increase the efficiency of a turbine by reducing the stress levels.
INDEX FOR VOLUME 23, 2019
390-395
10.1615/HighTempMatProc.v23.i4.100