Mechanochemical processing of aluminum particles to obtain energy-insense materials
DOI:
https://doi.org/10.18321/cpc22(3)251-259Keywords:
modifier, aluminum, stearic acid, polyvinyl alcohol, graphite, mechanochemical treatmentAbstract
In this paper, the use of two grades of powdered aluminum of various dispersities is investigated: coarse-grained aluminum (CD) with particle sizes of more than 200 microns and Al PA4 with particle sizes from 20 to 63 microns, as components for energy-intensive materials. The plasticity of aluminum particles makes it difficult to mechanically grind them, so modifiers such as stearic acid, graphite and polyvinyl alcohol have been added to facilitate the dispersion process. After mechanochemical treatment of Al PA4 with 20% graphite, the particle size of the resulting powder was less than 20 microns. With the addition of 3% PVA, the average particle size was 16.1 microns, and with the use of 20% PVA increased to 30.5 microns. The specific surface area after mechanical action also increased to 4,976 and 14,648 m2/g, respectively. An increase in the content of graphite and polyvinyl alcohol in composites leads to an increase in the activity of aluminum, while the content of stearic acid above 3% causes a decrease in the increase in activity. Thus, the mechanochemical treatment of aluminum powders using various organic modifiers makes it possible to significantly change their morphological and structural properties. The results obtained open up new prospects for the creation of energy-intensive materials with improved characteristics that can be widely used in various fields, including energy and fuel technologies.
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