Mechanical sensitivity and detonation parameters of aluminized explosives

Experiments were performed to study the effect of the species particle size and structure of aluminized mixture samples on the sensitivity and detonation parameters of HMX, nitroguanidine, bis(2,2,2-trinitroethyl)nitramine, and their mixtures with an Al powder with a mean particle size of 0.1-150 mum. The addition of ultrafine Al to HMX and bis (2,2,2-trinitroethyl)nitramine substantially increases the sensitivity to mechanical effects and decreases the detonation velocity. In compositions with nitroguanidine, the detonation velocity practically does not vary. For nitroguanidine, the width of the chemical-reaction zone and Chapman-Jouguet parameters were determined by recording the detonation-pressure profiles. The pressure profiles for bis(2,2,2-trinitroethyl) nitramine show that detonation decomposition can occur in two stages. A two-peak detonation-wave structure was detected for mixtures of HMX with Al. Temperature measurements indicate that Al interacts with detonation products in the immediate proximity to the front. The highest temperature was recorded for compositions containing ultrafine aluminum and an aluminum dust.