The incorporation of nanoaluminum in an 86% solid composite propellant formulation poses processing problems when following conventional methods. Therefore, to accommodate an optimum percentage of nanoaluminum in such formulations, a new bicurative system was introduced. Summarizing in the present study, a bicurative system consisting of toluene diisocyanate and isophorone diisocyanate was chosen to enable incorporation of 18% nanoaluminum powder (93 nm) in place of 18% micrometer-sized Aluminum powder. The developed compositions were studied in detail for their mechanical, thermal, sensitivity, and ballistic properties. The mechanical properties data, such as tensile strength, E modulus, and percentage elongation, are almost on par with the values obtained with micrometer-sized aluminum powder using a developed bicurative system. The results of thermal properties reveal that, as the percentage of nanoaluminum increases in the composition, the onset decomposition temperature decreases. The impact and friction sensitivity data indicate that the sensitivity of the propellant formulation increases in comparison to micrometer-sized aluminum powder propellant. The ballistic properties, such as burning rate and ballistic evaluation motor data, reveal that there is more than a 110% increase in burning rate and a gain in specific impulse on the order of 6 s in comparison with propellants using micrometer-sized aluminum powder.
Evaluation of Nanoaluminum in Composite Propellant Formulation Using Bicurative System
Journal of propulsion and power ; 31 , 1
2015
Aufsatz (Zeitschrift)
Englisch
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