Condensed Phase Species Composition for Aluminum Particles Combustion in Nitrocellulose

摘要

The mixtures of nitrocellulose and aluminum with different particle size were ignited in a hermetic steel chamber. The pressures of combustion products were measured and the condensed products were recovered. The morphology and surface atomic distribution of the condensed products was studied with scanning electron microscopy and energy dispersive spectroscopy. The crystal structure and composition of condensed products were analyzed by X-ray diffraction. The results show that the products particles are still spherical shape whose size is roughly identical to that of the initial particles for micro aluminum particles. An analysis of condensed products morphology indicates that the reaction of aluminum proceeds on the particle surface. The amount of reacted aluminum importantly depends on the particles size of aluminum. Non-reacted aluminum, Al2O3 and Al2OC were founded in condensed products. γ-Al2O3 is present in all samples and α-Al2O3 is found only in the sample containing nano Al. The mass fraction of Al2OC varied ranged from 2 to 27%with the A1 particles size changed in condensed products.