Microstructures in ANFO Explosives

摘要

The microstructures of ANFO explosives made from different state ammonium nitrate (AN) and fuel oil have been characterized using scanning electric microscopy (SEM) and density measuring. We take the lead in observing the intragranular microstructure in ANFO explosives particles. The results show that ANFO explosive made from un-expanded AN particles has few pores and cracks inside and outside of the particles, its surface is more smoother than expanded ANFO explosives particles. While expanded ANFO explosives particles have many holes, cracks and protuberances, their particles surface is accidented, there are also many voids and twin crystals lying in the interior of expanded ANFO particles. ANFO-34 sample has some marked characteristics in pores and scrambling inside the particles, many holes also exist inside ANFO particles. The results also show that the crystal growth of expanded AN particles aren't completed.