Verfolgung der Verbrennungsreaktionen exothermer Massen auf Basis von Aluminium,Fluoriden und Kaliumnitrat mit Differentialthermoanalyse

DTA was applied to investigate the course of combustion of exothermic mixtures composed of aluminium, fluorides and potassium nitrate, and the results obtained were compared with the simultaneous results of X-ray investigations. The combustion of exothermic mixtures composed of aluminium, fluorides and potassium nitrate is similar to the combustion of mixtures where the potassium nitrate is substituted by sodium nitrate. Two exothermic reactions occur: between 400 and 520?, and between 800 and 1130?, in mixtures with sodium fluoride and between 450? and 650? and 850 and 1130? in mixtures with calcium fluoride. The reaction in the lower temperature range initiates the combustion of the mixture. In sodium fluoride mixtures this reaction takes place at lower temperature and seems to be more intense, since these mixtures inflame earlier than those with calcium fluoride. The reaction in the higher temperature range, which occurs at approximately the same temperature in the two cases, liberates the main part of the useful heat of the exothermic mixtures.