Combustion of Binary and Ternary Silicon/Oxidant Pyrotechnic Systems, Part I: Binary Systems with Fe203 and Sn02 as Oxidants
1993; Taylor & Francis; Volume: 95; Issue: 1-6 Linguagem: Inglês
10.1080/00102209408935327
ISSN1563-521X
AutoresR. Anil Rugunanan, Michael E. Brown,
Tópico(s)Rocket and propulsion systems research
ResumoAbstract Abstract– The results of a detailed study of the combustion of several binary silicon/oxidant pyrotechnic systems are reported in this and three immediately following papers. The overall aim of the study was to investigate the role of different oxidants in binary combination with silicon as the common fuel. Temperature profiles of the burning pyrotechnic compositions have been recorded. simultaneously with measurements of linear burning rates. by using thermocouples embedded in pressed columns of the pyrotechnic material. In this paper, results for systems containing the more thermally stable oxidants, Fe2O3 and SnO2, are reported and compared. Burning of the Si/Fe2O3 system is a multi-stage process. Burning rates were in the range 2.3 to 5.7 mm s-1, generally increasing with increasing silicon content and burning fails below 20% and above 40% silicon. The burning rates of the Si/SnO2 compositions ranged from 5.3 mm s-1 (20% Si) to 17.0 (40% Si) and were sensitive to the loading and pressing of the pyrotechnic column. Below 20% silicon and beyond 55% burning fails. The maximum temperatures measured were of the order of 1230°C (30% Si/Fe2O3) and 1360°C (30% Si/SnO2) which are approaching. but still belnw the melting point of Si (1410°C) and the oxidants (Fe2O3. 1565°C;SnO2. 1630°C). which suggests that burning in both systems must occur either through solid-solid reactions, or that the products may form some lower melting eutectics. Evidence in support of a condensed-phase reaction is the increase in the burning rate with increasing density as a result of better contact between the fuel and oxidant particles. and negligible mass-loss during combustion. Keywords: Pyrotechnicsiliconburning ratestemperature profilesiron(III) oxide. tin(IV) oxide
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