Thermal behavior of aluminum powder and potassium perchlorate mixtures by DTA and TG |
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Authors: | SM Pourmortazavi M Fathollahi SS Hajimirsadeghi SG Hosseini |
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Institution: | Faculty of Material and Manufacturing Technologies, Malek Ashtar University of Technology, P.O. Box 16765-3454, Tehran, Iran |
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Abstract: | In this work the thermal decomposition characteristics of micron sized aluminum powder + potassium perchlorate pyrotechnic systems were studied with thermal analytical techniques. The results show that the reactivity of aluminum powder in air increases as the particle size decreases. Pure aluminum with 5 μm particle size has a fusion temperature about 647 °C, but this temperature for 18 μm powder is 660 °C. Pure potassium perchlorate has an endothermic peak at 300 °C corresponding to a rhombic-cubic transition, a fusion temperature around 590 °C and decomposes at 592 °C. DTA curves for Al5/KClO4 (30:70) mixture show a maximum peak temperature for thermal decomposition at 400 °C. Increasing the particle size of aluminum powder increases the ignition temperature of the mixture. The oxidation temperature increased by enhance in the aluminum content of the mixture. |
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Keywords: | Potassium perchlorate Aluminum powder Thermal behaviour Ignition temperature Particle size effect Pyrotechnic |
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