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Aluminum (Al) particles are widely used in propellants, thermite and explosives. However, its energy release process is still not thoroughly investigated. In this paper, the reaction properties of Al particles at low and high heating rates were investigated using a thermal analysis system and a single-particle combustion system, respectively. At a low heating rate (10°C/min), when the temperature is raised to 1200°C, the oxidation efficiency of Al (which can also be regarded as the average oxidation rate) increases first and then decreases as the oxygen concentration increases. In addition, XRD results of intermediate oxidation products under air show that the oxidation of Al particles deepens with increasing temperature. The SEM results reveal that broken particles and large-size aggregates gradually appear in the sample as the temperature increases, and the surface of the Al particles becomes rougher. At high heating rate (combustion), with the increase of oxygen concentration, the probability of microexplosion of Al particles increases from 19.77 % under air to 82.67 % under 100 % O2. Furthermore, the combustion time gradually decreases with the increase of oxygen concentration, while the average mass burning rate gradually increases from 1.65 g/ms under air to 2.73 g/ms under 100 % O2. Based on the analysis of the surface structure of the intermediate oxidation products and the microexplosion of single particles, it is believed that the difference of the reaction law of Al particles at different heating rates may be related to the structural evolution behavior of the oxide film. This study provides basic data support for understanding the heat release behavior of Al particles. © 2025
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Combustion and Flame
ISSN: 0010-2180
Year: 2025
Volume: 276
5 . 8 0 0
JCR@2023
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ESI Highly Cited Papers on the List: 0 Unfold All
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30 Days PV: 2
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