铝粉形态学特征对Al/KClO4燃烧性能的影响

铝粉形态学特征是影响含铝点火药燃烧性能的关键因素.采用差示扫描量热法研究了不同形貌和粒度的铝粉在Al/ KClO4点火药体系的热分解行为及燃烧反应机理,得到了体系晶形转化、熔化、界面液相反应、气相氧化4个阶段的热分解反应方程式；从热分解温度、燃烧热、燃烧速度3个方面,分析了铝粉形态学特征对点火药燃烧性能的影响,得到了体...

The Influence of Morphology of Al Powder on Combustion Performance of Al/KClO4 Composition

The morphology of aluminium powder has a great effect on the combustion performance of aluminized compositions.The thermal behavior and burning performance of Al/KClO4 composition which containes different types of aluminium powder were investigated by a differential scanning calorimeter(DSC),and the thermal decomposition equations of crystal shape conversion,melting,interfacial liquid phase reaction,and gas phase oxidation reaction were concluded.The influence of morphology on combustion performance was studied from the aspect of decomposition temperature,combustion heat and rate,and the thermal decomposition mechanisms of compositions were concluded.The results shows that the dominant reaction of compositions was an interfacial oxidation reaction of atomic Al with molten KClO4.The fundamental factor which influences the combustion performance of compositions,was the variation of surface binding energy: The surface binding energy decreases with the increase in specific surface area and defects,and the corresponding performances macroscopically appear as low thermal decomposition temperature,quickly burning rates and strong heat effect.