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International Journal of Energetic Materials and Chemical Propulsion
HIGH-REACTIVITY ALUMINUM POWDERS
Faculty of Aerospace Engineering, Technion- Israel Institute of Technology, Haifa 32000, Israel
Sylvia and David IA Fine Rocket Propulsion Center and the Aerothermodynamics Lab, Faculty of Aerospace Engineering, Technion – Israel Institute of Technology, Haifa, 3200003, Israel
Aluminum powders are used in propellant, pyrotechnic, and explosive formulations, as well as in combustion systems, to increase energy and energy density. However, aluminum particles are usually covered by an oxide protective layer, causing long ignition delays. Shortening ignition time and enhancing combustion can be accomplished by activating the metal particle surfaces or by using powders with a high reaction surface. Methods of promoting ignition and increasing activation of aluminum particles are developed and discussed, including nickel and iron coating as well as a formation of porous aluminum particles. Study of the effectiveness of the methods developed reveals remarkable ignition enhancement of the aluminum powders..
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