Ageing
studies of magnesium–sodium nitrate pyrotechnic compositions |
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Authors: | W P C de Klerk W Colpa P J van Ekeren |
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Institution: | (1) Materials and Thermochemistry Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, 116023, People’s Republic of China;(2) Faculty of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian, 116023, People’s Republic of China;(3) School of Material Science and Engineering, South China University of Technology, Guangzhou, 510640, People’s Republic of China;(4) Department of Material Science, Fudan University, Shanghai, 200433, People’s Republic of China; |
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Abstract: | The ageing
characteristics of pyrotechnic compositions are influenced not only by temperature,
but also by surrounding effects as humidity and vibrations. In this paper
the thermal stability of the pyrotechnic system magnesium–sodium nitrate
will be investigated.
In an inert helium atmosphere two steps
of mass loss, which were not completely separated from each other, were observed
in the temperature range from 65 to 265°C: a mass loss of about 15% between
65 and 160°C and about 34% between 160 and 265°C. It is assumed that
these two steps are caused by different processes. The separation between
the two steps was not or hardly detectable for measurements that were performed
in a nitrogen atmosphere. Using MS and FTIR (mass spectrometry/Fourier transform
infrared spectroscopy) the evolved gases were analysed. Only above about 170°C
evolving gases were detected (which means that during the first step no gases
were detectable). The detected gas mainly consists of CO2,
CO and N2O, with smaller amounts of NO2,
NO and possibly HCN. A third step of mass loss (8–9%) was observed above
314°C. The process which caused this step of mass loss is considered not
to contribute significantly to the ageing of the material at much lower temperatures
of maximum 80°C, which is of interest in view of the use of the materials. |
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Keywords: | |
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