Influence of dispersion aluminum powders on the regularities of their interaction with nitrogen

Optimal Modes for the Fabrication of Aluminum Nanopowders by the Electrical Explosion of Wires

“…According to the literature data [15], the big particles form during the metal melting and sputtering, whereas the origin of the small particles is related to the metal evaporation during the explosion and the further condensation of the vapors. On the particles surface, we observe an approximately 5 nm thick well-defined layer which consists of aluminum oxidehydroxide phases according to the literature data [2] formed during the passivation of the powders in the air. The presence of these phases is confirmed by the volumetric analysis, according to which the content of metallic aluminum in the sample is 96 wt.%.…”

“…However, in contrast to the previous sample, we can observe particles having the shape of a hexagon (Figures 3(b) and 3(c)), where the diameter of such particles is always less than 100 nm. According to the authors [2], the presence of the faceted particles (white hexagonal or polygonal lines in Figures 3(b) and 3(c)) is related to the mechanism of their crystallization. Droplets with the size of 100 or more nanometers crystallize from a large number of nuclei of which the mutual growth limitations contribute to the formation of particles with a spherical shape.…”

“…Because of their structural peculiarities, the products of powder metallurgy are more thermally stable and resist better cyclic temperature gradients and deformation stress [1]. The transition from bulk metals to highly dispersed powders and nanoparticles is characterized by a change in a number of fundamental material properties, such as melting temperature, electron work function, and chemical reactivity [2]. This allows us to prepare novel metal and composite materials with improved mechanical, electrophysical, magnetic, and physicochemical characteristics.…”

Nanoaluminium: is there any Relationship between Powder Particles’ Size, Non-Isothermal Oxidation Data and Ballistics?

“…Furthermore, the different definitions of the intense oxidation onset temperature and other parameters on the DTA/DSC/TGA curves can lead to confusing comparisons Copyright © 2017 Institute of Industrial Organic Chemistry, Poland between different datasets [23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41]. For certain nAl samples with a specific surface area 12 m 2 /g, the mass fraction of micron-sized particle clusters (1-3 µm) could be 68 wt.%, but the number of clusters was only 2% of the total number of particles [56].…”

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

“…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.…”