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A comparative study of Si-BaSO4 and Si-CaSO4 pyrotechnic time delay compositions.

Tichapondwa, S M*; Focke, W W*; del Fabbro, O*; Gisby, J A; Kelly, C* (2016) A comparative study of Si-BaSO4 and Si-CaSO4 pyrotechnic time delay compositions. Journal of Energetic Materials, 34 (3). pp. 342-356.

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Slow burning Si-BaSO4 pyrotechnic delay compositions are employed commercially for intermediate to long time delays. However, there is very little information on this composition available in open literature. The reactivity of this composition was therefore characterized. A comparative analysis of this reaction with that of Si-CaSO4 was also carried out so as to establish the cation effect on sulfate based oxidizers. The Si-BaSO4 composition supported combustion in the range of 20 to 60 wt.% Si in the bomb calorimeter. However, burning was only sustained between 20 to 40 wt.% Si in rigid aluminium tubes with burning rates of between 8.4 and 16 mm s-1. The cation effect on the burning rates for these sulfate based oxidizers was not profound as the Si-CaSO4 composition had comparable burn rates (6.9 - 12.5 mm s-1). However, in other pyrotechnic reaction properties such as energy output and change in pressure with time, the CaSO4 based formulation had higher reactivity compared to BaSO4. Both formulations are insensitive to impact, friction or ESD stimuli. The reaction products were a complex mixture that contained crystalline phases in addition to an amorphous phase.

Item Type: Article
Keywords: MTDATA, thermodynamics, phase equilibria, silicon, barium sulfate, calcium sulfate, time delay, pyrotechnics
Subjects: Advanced Materials
Advanced Materials > Materials Modelling
Identification number/DOI: 10.1080/07370652.2015.1077907
Last Modified: 02 Feb 2018 13:13
URI: http://eprintspublications.npl.co.uk/id/eprint/6984

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