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Studies on the ageing of a magnesium-strontium nitrate pyrotechnic composition using isothermal microcalorimetry and thermal analysis techniques |
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| Authors: | I Tuukkanen EL Charsley SJ Goodall TT Griffiths |
| Institution: | a Defence Forces Materiel Command, P.O. Box 69, FIN-33541 Tampere, Finland b Centre for Thermal Studies, University of Huddersfield, Queensgate, Huddersfield HD1 3DH, UK c QinetiQ Ltd., Fort Halstead, Sevenoaks, Kent TN14 7BP, UK d Institute of Materials Chemistry, Tampere University of Technology, P.O. Box 527, FIN-33101 Tampere, Finland |
| Abstract: | The ageing behaviour of a pyrotechnic composition containing equal parts by mass of magnesium and strontium nitrate has been followed by isothermal microcalorimetry. The measurements were carried out on the samples at 50 °C and 65% relative humidity in air using closed ampoules. The results have been compared to those obtained for magnesium powder under the same conditions. Following an initial induction period, the pyrotechnic compositions reacted at a much faster rate than magnesium powder alone. The main reaction products were found to be magnesium hydroxide and strontium nitrite; the amounts formed have been correlated with the cumulative heats of ageing. In addition, the influence of the ageing process on the pyrotechnic reaction has been studied by high temperature differential scanning calorimetry (DSC) and by modulated temperature DSC. |
| Keywords: | Ageing DSC Isothermal microcalorimetry Magnesium Pyrotechnics Strontium nitrate Thermal analysis |
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