Iranian Scientific Association of Energetic Materials

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In the last decade, superfine powders of metals synthesized by several methods have become widely used in a number of different fields of material science. Superfine aluminum powders (SFAPs) have a broad application in energetic formulations. Aluminum powders have a high combustion enthalpy, which is why they are widely used in propellants, explosives and pyrotechnics. The decrease in the size of aluminum particles and increase in the reaction’s surface area, considerably increase the combustion rate of the propellant composition. On the other hand, the basic problem of using aluminium powders is the relatively low content of metallic aluminum because of the high reactivity of aluminium powders. Another problem of aluminium powders is the passivation after production. To stabilize aluminium powders it is necessary to cover them by a thin film. Aluminium powders surfaces were covered with the viton resin and its function was compared with stearic acid. The process of coating and analysis of passivated powders was studied by SEM, TEM and EDS. The thickness of the coated layer is about 30 nm according to the results of transmission electron microscopy (TEM) while the mean diameter of the aluminum particle is 1 µm. The powders coated with viton and stearic acid showed the increased stability to oxidation in water and air during the storage period.

Keywords: keywords : Aluminum powders, Coating, Viton, Stearic acid.

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