Small-Scale Testing of High Bulk Cubical and Spherical Nitroguanidine forComparative Evaluation

摘要

Two types of nitroguanidine (NQ), high bulk cubical (HBCNQ) and spherical (SNQ),were evaluated neat and as melt cast formulations with tritonal (TNT) and with RDX/wax/aluminum. The objective was to differentiate between the two crystal habits of NQ with respect to thermal characteristics, shock sensitivity, and performance. Parameters investigated were thermal stability, critical diameter, detonation velocity and pressure, shock sensitivity, and bullet impact. Differential scanning calorimetry (DSC) thermograms suggest the HBCNO is less stable than SNQ. This is also reflected in apparent activation energies and is supported by DSC and slow cookoff data from their melt cast formulations. Shock sensitivities and detonation pressures were obtained on selected formulations. A correlation between charge diameter and that diameter, d (Sub1), (NQ). above which the detonation velocity of the NQ component of the TNT-based formulation performs ideally was demonstrated. The overall results suggest that ideal performance of NQ is influenced by factors that include porosity, crystal habit, other energetic and/or nonenergetic (late reacting) ingredients. charge diameter, input pressure, and perhaps particle size and that it can be achieved more readily from a formulation containing SNO.... Nitroguanidine, Comparative testing, Spherical, Thermal sensitivity, High bulk cubical, Shock sensitivity.