The kinetics of oxidation of aluminum electroexplosive nanopowders during heating in air

Korshunov, A. V.; Il’in, A. P.; Radishevskaya, N. I.; Morozova, T. P.

doi:10.1134/s0036024410090244

Cited by 19 publications

(11 citation statements)

References 9 publications

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“…Aluminum oxide is a predominant component of the examined oxide films; it crystallizes forming grain boundaries that give way to oxygen particles to the alloy surface. According to different literature data [6][7][8][9][10][11][12], the temperature of the phase transformation of aluminum oxide falls within the range of 475-550 °C. Figures 2, 3 show the literature data proving that in the temperature interval 475-550°C, on the surface of bulk [6] and finely-dispersed aluminum [12], the amorphous surface oxide film transforms into a crystalline gamma modification.…”

Section: Thermal Oxidation Of the Alloys In Airmentioning

confidence: 99%

Peculiarities of Surface Interaction of Al+REM Alloys with Air and Water

Попов¹,

Akashev²,

Шевченко³

et al. 2017

ujpa

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The effect of the phase and chemical composition of aluminium+rare earth metal (1-2.5%R, ~22%R) polycrystalline alloys (Al+REM) on the rate of their surface film growth in air (at temperatures 400, 500, 600°C) and in water (~100 °C) was studied. It is shown that in the temperature range 500-600°C the oxidation of 1-2.5%R alloys in air is enhanced due to the increasing amount of REM oxide phases and crystallization of amorphous Al 2 O 3 . Al+1at.%Yb alloy shows the lowest oxidation stability in this temperature range owing to the formation of the greatest amount of REM oxides. Oxidation of Al+REM (~22%R) alloys in air begins at a temperature below 400°C. Their oxidation rate depends on the type and amount of dopant metal and the phase composition: the presence of REM-rich intermetallics in the alloy dramatically increases its reactivity. It is established that in the interaction of Al+REM alloys with boiling water, the active reacting phase is aluminum.

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Section: Thermal Oxidation Of the Alloys In Airmentioning

confidence: 99%

Peculiarities of Surface Interaction of Al+REM Alloys with Air and Water

Попов¹,

Akashev²,

Шевченко³

et al. 2017

ujpa

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“…Порошки алюминия различной дисперсности используются в аддитивных и порошковых технологиях изготовления конструкционных деталей машин и механизмов, катализаторов, добавок в пиротехнические составы и ракетные топлива и др. [1][2][3][4][5][6][7][8][9][10][11]. Реакционную способность повышают за счет увеличения дисперсности порошков, площади удельной поверхности [12] или введения активных добавок [13], которые иногда являются нежелательными примесями.…”

Section: Introductionunclassified

Влияние Электромагнитного Поля Промышленной Частоты На Физико-Химические Свойства Микро- И Нанопорошков Алюминия

Мостовщиков¹,

Тихонов²,

Приходько³

2021

Журнал Технической Физики

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“…A previous research has shown that by improving ignition characteristics such as shortening the ignition time could reduce agglomeration phenomena. [12] An effective strategy to overcome the mentioned defects is to create a protective coating shell on the surface of n-Al powders after removal of Al 2 O 3 , [2] including by inorganic or organic coating modification. [4,5] At present, the most commonly used inorganic substances for surface coating modification of n-Al are silicon, alumina, carbon, iron and its oxides, nickel and so on.…”

Section: Introductionmentioning

confidence: 99%

“…Firstly, utilizing nickel as the protective shell can prevent Al powders from being oxidized during storage and transportation; [14] Secondly, highly exothermic chemical reaction occurs between Al core and Ni shell, providing additional energy to aluminum powders, and consequently decreasing ignition temperature and shortens the ignition delay time. [9,12,15,16] Eric Boydet [17] has conducted experiments to study the ignition and combustion performances of Ni-coated and uncoated aluminum particles at atmospheric pressure, and the result shows there is a significant reduction of ignition temperature of Ni-coated n-Al in average; Thirdly, Ni-coated n-Al powders can also be ignited under inert environments, such as Ar atmosphere; [4,17] And finally nickel coatings have also been shown to reduce Al particle agglomeration in propellants. [18] Alexander S. Mukasyan [19] suggested that the reaction triggered at the melting point of Al-core and Ni-Shell prevents rapid agglomeration.…”

Section: Introductionmentioning

confidence: 99%

“…Agglomeration of n‐Al as solid propellants also promote slag formation which may damage the rocket engine. A previous research has shown that by improving ignition characteristics such as shortening the ignition time could reduce agglomeration phenomena [12] . An effective strategy to overcome the mentioned defects is to create a protective coating shell on the surface of n‐Al powders after removal of Al 2 O 3 , [2] including by inorganic or organic coating modification [4,5] .…”

Section: Introductionmentioning

confidence: 99%

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Preparation of Al/Ni Nano‐composite Particles via Replacement Reaction and Their Characterization

Chen

Tang

et al. 2020

ChemistrySelect

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To improve the ignition and combustion properties of n-Al powders, n-Al/Ni composite particles were prepared by replacement reaction under alkaline environment. In the anhydrous ethanol system, the effect of solution parameters on sample preparation was studied, and the preparation technology of n-Al/Ni was accordingly optimized. The chemical constituents, phase, morphology and combustion performances of n-Al/Ni were characterized by chemical titration, XRD, SEM, EDS and combustion duration test, respectively. The results showed that the optimized replacement reaction method can modify the n-Al powders by nickel well, and it was appropriate to use OH À 1 corresponding to consume 60 % alumina in the n-Al powders and Ni2 + equal to 12.35 % mass fraction of n-Al powders. It can be seen from the SEM images that the samples have a dispersive spherical morphology with a uniform distribution of nickel overall the samples. And the XRD results confirmed that nickel exists in the samples as a metallic substance. The results of chemical titration indicated that the content of active aluminum in the optimal sample was slightly higher than that of raw n-Al, but considering Ni, the content of reactive substance in the sample was greatly increased. The combustion duration test also proved that the combustion performance of n-Al/Ni was significantly improved. In conclusion, the improved properties promise a further enhanced prospect of n-Al in energetic materials.

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The kinetics of oxidation of aluminum electroexplosive nanopowders during heating in air

Cited by 19 publications

References 9 publications

Peculiarities of Surface Interaction of Al+REM Alloys with Air and Water

Peculiarities of Surface Interaction of Al+REM Alloys with Air and Water

Влияние Электромагнитного Поля Промышленной Частоты На Физико-Химические Свойства Микро- И Нанопорошков Алюминия

Preparation of Al/Ni Nano‐composite Particles via Replacement Reaction and Their Characterization

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