Ammonium nitrate (AN) is a suitable component (oxidizer) in the formulation of propellants, explosives and gas generators. For this application spherical particles with exactly predetermined mean particle size and particle size distribution are required. Besides there are different demands on the phase stability and/or the purity of the particulate AN product. In this paper phase transitions of AN and modification of phase transition temperature by using selected metal oxides (CuO, NiO and ZnO) are described. For some applications pure AN has some drawbacks, i.e. low performance, low burning rates and phase transitions that influence material properties. It is possible to avoid these phase transitions by adding phase stabilizing components (different metal oxides nickel, copper or zinc oxide) to the production process of spherical ammonium nitrate. These additives are showing different effects on the phase transition temperatures. At the Fraunhofer-ICT particles of ammonium nitrate are produced by atomisation of a melt, which leads to spherical materials especially suited for processing in propellant mixtures. This ICT product is called PSAN (phase stabilized ammonium nitrate). it is also possible to produce pure, spherical AN without phase stabilizing agents in the same particle size range (20 micron to 200 micron), so-called SCAN (spray crystallized AN).
Spherical ammonium nitrate for gas generators
Sphärisches Ammoniumnitrat für Gasgeneratoren
10 Seiten, 8 Bilder, 2 Tabellen, 10 Quellen
Conference paper
English
Spherical Ammonium Nitrate for Gas Generators
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