Abstract
The effect of the stoichiometry (i.e., the Al/Fe ratio) and the compressed density of the sample on the dynamics of energy release from a series of Al/Fe2O3 metastable intersitital composites (MIC) were investigated. The reaction was initiated photothermally with a single 8 ns pulse of the 1064 nm fundamental of a Nd:YAG laser. The reaction dynamics were measured by using time-resolved spectroscopy of the light emitted from the igniting and deflagrating material. Two fundamental parameters are measured by this approach: the time to initiation and the duration of the deflagration. The effect of Al particle size on these parameters shows that they attain a minimum value at 100 nm, Al with 120 and 50 nm both having longer initiation and deflagration times. The amount of active Al metal relative to the amount of oxide explains this trend as the Al particle size decreases. As the Al/Fe ratio was varied from stoichiometric (1:1 Al:Fe) to slightly fuel rich (1.5:1) there is a significant decrease in the initiati...
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