Secondary Reaction Mechanism and Metal Acceleration Characteristics of Oxidizer-Containing CL-20-Based Aluminized Explosives

Due to the increased oxidizing gas concentration in the detonation products, the addition of oxidizing agents to explosives could enhance the burning rate and the reaction degree of the aluminum powder, which would further improve the metal acceleration capabilities of the explosives. The metal acceleration capabilities of CL-20-based aluminized explosives that contained oxidizers were investigated by means of standard cylinder tests. The effects of the oxidizers on the crossover time and the reaction degree of the aluminum powder were analyzed by replacing the aluminum powder with lithium fluoride for comparison. Based on the sources of the cylinder-wall velocity, an empirical expression that relates the explosive composition to the cylinder-wall kinetic energy was fitted. The results show that the detonation velocity and aluminum concentration of the CL-20-based aluminized explosives were linearly correlated, and that the detonation velocities of the oxidizer-containing explosives could be set equivalent to those of oxidizer-free explosives within a certain margin of error. However, with the addition of the oxidizer, the relationship between the detonation pressure and the concentration of the base explosive changed. The experimental results show that the addition of the oxidizer advanced the crossover time by 4.81 µs and 1.66 µs for aluminum concentrations of 5% and 30%, respectively. According to the fitted relationship, it was predicted that the maximum value of the cylinder-wall kinetic energy could be obtained when both the aluminum powder and the oxidizer had concentrations of 10%.