Study on sensitivity and detonation property of explosive containing B/Al

摘要

In order to explored the application of B/Al compound powde in energetic materials, a new HMX based explosive formulation containing B and Al powder, oxidizer AP, polyurethane binder is designed and prepared. The morphology of B, Al and B/Al compound powder is observed by SEM and the SEM images at different sizes are obtained. The impact sensitivity, friction sensitivity, electrostatic spark sensitivity, cap initiation sensitivity are measured, which made a fully acknowledge of the safety of explosive containing B/Al under different external energy stimuli. The spring electric pin method is applied to measure detonation velocities of prepared 050mm explosive cylinders containing B/Al. The detonation pressures are calculated by the empirical equation, the influence of B/Al compound powder content on detonation property is discussed. The results show that there are many little amorphous flake B powder on the surface of Al powder for the B/Al compound powder. The mechanical sensitivity of explosive containing B/Al is higher, while the mechanical sensitivity is obviously lowered by adding desensitized HMX and AP. and it can be further lowered by adding polyurethane binder. While the formulation PF-l. PF-2 and PF-3 are solidified by vacuum vibration casting, the densities of