Abstract
The combustion of pyrotechnic delay composition based on metallic fuel and perchlorate oxidizer involves complex reaction mechanisms and condensed phase heat release. Studies on the effect of aging on ignition/burning properties, and understanding of such multicomponent pyrotechnic delay mixtures are quite limited. The present work focuses on investigating the reaction kinetics, ignition, and combustion behavior of a zirconium/nickel (Zr/Ni)-alloy-based pyrotechnic delay mixture. Comparisons are presented between pristine and hygrothermally aged samples subjected to accelerated aging conditions under a constant temperature of 71°C and 95% relative humidity for 2 weeks. Activation energy versus reaction progress, ignition delay time as a function of maximum wire temperature, reaction zone temperature profile, and burning rate with respect to pressure are obtained from various experimental procedures. Results indicate that aging increases the ignition delay time and temperature rise time significantly, and a substantial decrement in the heat of reaction and burning rates along with incomplete combustion are evident.
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