Thermal Improvable Behavior of A Pressed Fitting Mixed Explosive

A mixed explosive contains Al powder, hexogen (RDX), paraffin, etc. It is pressed fitting into Phi 20x20mm pillars. The pillars are heated in 55C for 57days and are measured in volume, mass and density. They are experimented in mechanical properties, sensitivities, stability. The micro-structure of the pillar are tested, and the outer skin of pillar is observed. The results reveal that pillar remains unchanged in mass, becomes bigger in volume and smaller in average density; Pillars show no cracks, but they become bigger in density-difference; pillars become bigger in both compression strength and shear strength, their vacuum stability test gas-bleed volume and friction sensitivity all becomes smaller; the paraffin in heated pillar is more regular, and RDX is better in quality. The above findings confirm that after heated, the paraffin in the pillars becomes attached to each other, and fills up the crevices between solid particles, i.e. its cohesion and cladding improve. And RDX improves in quality, so the pillars show a tendency of improvement in terms of macro property. All this shows that the thermal stress exercises a improvable function on the pillars.