INFLUENCE OF POROSITY OF PRESSED SAMPLES OF SUPERFINE ALUMINUM POWDER ON COMBUSTION PARAMETERS

V.O. Popov, V.N. Komov, E.M. Popenko, A.V. Sergienko
DOI: 10.25699/SSSB.2021.40.6.023 Download PDF
Abstract: This article is devoted to the study of the effect of porosity of compressed tablets from ultrafine aluminum powder (STP Al). The combustion mechanism was determined, which proceeds in two stages: the first, slow, which includes both "ring" combustion of the side surface and parallel combustion with concentric layers, the second stage is volumetric, accompanied by a sharp spontaneous increase in the combustion temperature and glow intensity. It has been shown that an increase in the packing density of HFC Al makes it possible to slow down the process of aluminum oxidation by more than two times. This is due to a decrease in the gas permeability of the tablet and the difficulty of air access deep into the sample. An increase in the porosity of the material makes it possible to regulate the process of nitride formation by increasing the nitrogen content in the products during the filtration mechanism of combustion, which opens up the possibility of obtaining refractory materials.
Index terms: porosity, filtration combustion, nitride formation, regularities of combustion of ultrafine aluminum powder.

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