Characterization
of the aluminum/potassium chlorate mixtures by simultaneous TG-DTA |
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Authors: | S M Pourmortazavi S S Hajimirsadeghi S G Hosseini |
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Institution: | (1) Faculty of Material and Chemical Engineering, Malek Ashtar University of Technology, Tehran, Iran, 16765-3454 |
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Abstract: | Thermogravimetry (TG) and differential thermal analysis
(DTA) in the non-isothermal mode have been used to examine the thermal behaviour
of the micron sized aluminum (Al) powder/potassium chlorate pyrotechnic systems
in air, in relation to the behaviour of the individual constituents. The effects
of different parameters of Al powder, such as particle size and its content
in the mixtures, on their thermal property were investigated. The results
showed that, the reactivity of Al powder in air increases as the particle
size decreases. Also, it was found that neat Al with 5 μm particle sizes
(Al5) has a fusion temperature of about 647°C,
that for 18 μm powder (Al18) is 660°C. Pure
potassium chlorate has a fusion temperature around 356°C and decomposes
at 472°C. DTA curves for Al5/KClO3
(30:70) mixture showed a maximum peak temperature for the ignition of mixture
at 485°C. Also, by increasing the particle size of Al powder, the ignition
temperature of the mixture increased. On the other hand, the oxidation temperature
increased by enhancing the Al content of the mixtures. In this particular
study, we observed that the width of reaction peak for the mixtures corresponds
to their Al contents of samples. |
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Keywords: | aluminum powder ignition temperature particle size effect potassium chlorate pyrotechnic thermal behaviour |
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