Granulation in the powder technology of self-propagating high-temperature synthesis

Amosov, A. P.; Makarenko, A. G.; Samboruk, A. R.; Seplyarskii, B. S.; Samboruk, A. A.; Gerasimov, I. O.; Orlov, A. V.; Yatsenko, Vitaliy A.

doi:10.3103/s1067821213030024

Cited by 17 publications

(17 citation statements)

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“…If the gaseous reactant (nitrogen) is forced through with a given flow rate through a porous sample, then this is forced filtration. In this case, the side surfaces of porous samples are gas-tight and nitrogen is supplied only through the ends of the sample [9].…”

Section: Methodology Of the Experimentsmentioning

confidence: 99%

“…Gas flow rate at the reactor inlet and outlet was adjusted by using the Red-y type electronic micro flow meters (16) and (17). The reaction temperature was measured with the W-Re BP5/20 thermocouple (9); the signal from the thermocouple was fed into the recorder device via an amplifier. The refrigerator (18) served to cool down gaseous products of the reaction before they entered the flow rate meter (17).…”

Section: Methodology Of the Experimentsmentioning

confidence: 99%

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Combustion Synthesis of Chromium Nitrides

Зиатдинов

Alexander

Promakhov

et al. 2019

Metals

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This paper explores different modes of synthesis by combustion of chromium-nitrogen and ferrochromium-nitrogen alloys. The SH-synthesis of chromium nitrides and ferrochromium nitrides was performed. Regular patterns in layer-by-layer and surface modes of Cr combustion in nitrogen were investigated. The mechanism of non-stationary combustion during the synthesis of chromium was investigated. Regular patterns of chromium and ferrochromium combustion in the cocurrent filtration mode were analyzed, and the possibility to intensify the SHS process using the pressure filtration principle was assessed. The process of chromium powder combustion in the cocurrent flow of nitrogen-containing gas in the range of specific flow rates from 20 cm3/s·cm2 was investigated. Pressure filtration intensifies the process of combustion wave propagation in the Cr–N2 system. Here, the combustion rate increases while the degree of nitridation decreases. We discovered superadiabatic heating modes when the reaction zone was blown with pure nitrogen and a nitrogen-argon mixture. The tempering mode that was realized during pressure filtration allows for the uptake of high-temperature single-phase non-stoichiometric phases of Cr2N.

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Section: Methodology Of the Experimentsmentioning

confidence: 99%

Section: Methodology Of the Experimentsmentioning

confidence: 99%

Combustion Synthesis of Chromium Nitrides

Зиатдинов

Alexander

Promakhov

et al. 2019

Metals

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“…The combustion of powders of transition metals or mixtures thereof with nonmetals (carbon, boron) in an active gas atmosphere is an effective method for the synthesis of carbides, nitrides, and carbonitrides [1][2][3]. In the present work, we studied the combustion of a granular mixture of titanium with carbon black in a quartz tube, with the charge bed being blown with nitrogen.…”

Section: Introductionmentioning

confidence: 99%

Effect of hydrogen content in titanium on the structure of the front and the specific features of the combustion of a Ti + 0.5C granular mixture in a cocurrent nitrogen flow

Тарасов

Seplyarskii

Кочетков

et al. 2016

Russ. J. Phys. Chem. B

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Specific features of the combustion of a titanium-carbon black granular mixture in a quartz tube blown with nitrogen is studied. In contrast to the previous studies, titanium with increased hydrogen content is used. The gas flow (cocurrent filtration) is produced by applying a fixed pressure differential less than 1 atm across the inlet and outlet of the tube. The characteristics of the combustion of a Ti + 0.5C granular mixture in a nitrogen flow are investigated. It is shown that an increased content of hydrogen in titanium leads to the formation of a two-front combustion wave. It is demonstrated that the first and second fronts of the two-front structure arise due to the interaction of the charge with nitrogen. The velocities of propagation of the fronts increase with the nitrogen pressure differential.

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“…При данном процессе тепловыделение локализовано в узком слое и передается от слоя к слою путем теплопередачи, а получаемые при синтезе продукты характеризуются достаточной чистотой, что объясняется развитием высоких температур. Достоинство технологии заложено в использовании теплоты, выделяющейся при протекании химической реакции, вместо нагрева вещества, что подразумевает снижение энергоемкости процесса при одновременном развитии высоких температур синтеза вплоть до 2000 °С [1,2].…”

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“…Достоинствами применения и развития данной технологии является относительная простота ее реализации, но в то же время существуют и недостатки: сложность управления процессом синтеза и быстрота его протекания, что не всегда позволяет достигать необходимых результатов (получение изделий заданных размеров, достижение необходимых прочностных характеристик, заданной пористости) [2,3].…”

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The application of self-propagating hightemperature synthesis to obtain a protective-strengthening alumina-silica coatings

Попов

Богдан

Дятлова

et al. 2019

Vescì Akademìì navuk Belarusì. Seryâ himičnyh navuk

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This article shows the possibility of using the method of self-propagating high-temperature synthesis to obtain protective and hardening coatings for the lining of various thermal installations. The development of compositions of ceramic masses for the production of SHS coatings was carried out on the basis of aluminum powder, clay raw materials, exhausting and ﬂuxing components as well as mineralizing additives. The prepared suspension including pre-prepared and thoroughly mixed raw materials was applied with a brush or a spray gun onto the previously cleaned and moistened surface of an aluminosilicate refractory. The firing of the coating was carried out in accordance with the mode of removing the thermal unit at the operating temperature. The temperature of the initiation of the SHS process, previously established using differential thermal analysis, was in the range of 570–720 °C and depended on the chemical composition of the charge. It has been established that the presence of crystalline phases of silica, corundum, hematite and a number of solid solutions (mainly calcium and sodium aluminosilicates) in the coating structure provides the necessary combination of the thermomechanical and thermophysical characteristics of the coatings. On the basis of the conducted research, the expediency of applying the technology of self-propagating high-temperature synthesis for the production of protective and hardening coatings on the lining of thermal units is demonstrated, which is confirmed by industrial tests in the conditions of the Minsk Ceramic Factory OJSC «Keramin».

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Granulation in the powder technology of self-propagating high-temperature synthesis

Cited by 17 publications

References 0 publications

Combustion Synthesis of Chromium Nitrides

Combustion Synthesis of Chromium Nitrides

Effect of hydrogen content in titanium on the structure of the front and the specific features of the combustion of a Ti + 0.5C granular mixture in a cocurrent nitrogen flow

The application of self-propagating hightemperature synthesis to obtain a protective-strengthening alumina-silica coatings

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