A Review on the Preparation Methods of Superfine Ammonium Perchlorate

Preparation of micron and nano sized ammonium perchlorate (AP) particles in propellant formulation is required for access high burning rate propellants.The decomposition and burning rate of AP particles are mainly affected by decreasing the particle size, which can decrease the decomposition temperature, and increase burning rate.AP particles at the micro and nano-scales, have a great influence on the burning rate of composite solid propellants. By decrease in particle size of AP,surface areaand burning rate of produced propellantareincreased. Furthermore, tensile strength and elasticmodulus of the propellantsin the presence of superfine AP increased. Conventionalmethods for preparation of fine AP such as ball-milling, sol-gel, liquid antisolvent crystallization,freeze drying, and spray dryingmethods are used. In this paper, the advantages and limitations ofvarious methods of superfine AP production are investigated.