Aging of Pyrotechnik Compositions. The investigation of chemical changes by IR spectroscopy and x‐ray diffraction

Abstract

Abstract The aging of tracers, containing different amounts of Mg, Sr(NO 3 ) 2 , KClO 4 , Al‐Mg alloy and organic binder, was conducted under the conditions of 50.0% and 98.5% relative humidities at 75 °C, and of 98.5% relative humidity at 25 °C. IR spectroscopy and X‐ray diffraction were used for investigation of chemical changes. At the lower humidity no detectable changes were observed. Tracer of metauoxidant ratio >1 exhibits decreased stability, changing significantly under the conditions of higher humidity, even at room temperature. In the reaction sequence of aging process (Mg(OH) 2 ) and SrCO 3 are formed, with concomitant decrease in Mg and Sr(NO 3 ) 2 content. Alloy changes only slightly, and the content of KClO 4 and binder remains unchanged. Interaction between metal and nitrate is considered to be essential in the process of chemical aging.