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- W2912263534 abstract "Abstract The structure of mechanically activated (MA) energetic composites are complex, having at the same time intra-particle reactive length scales as small as sub-micrometer and inter-particle length scales as large as 1 mm. This work investigates the combustion propagation of MA aluminum and polytetrafluoroethylene (PTFE) while varying as-milled particle size, stoichiometry, particle bed density, and confinement to better understand combustion propagation. Propagation rates of MA Al/PTFE are four orders of magnitude slower than similar physically mixed nano-Al/PTFE or micron-Al/PTFE compositions reported elsewhere. Combustion of MA composite beds is found to be macroscopically stable within quartz tubes of >3 mm diameter, though microscopic relay-race combustion is observed in which slow combustion transfers between particles preclude rapid intra-particle combustion. Confined burning rate is increased with reduction of packing density below 55% TMD and burning rate is insensitive to tube end confinement. A maximum burning rate is observed at Al/PTFE ratios of 50/50 wt.%, corresponding to conditions predicted to maximize gas production. Packed beds containing larger (> 75 µm) particles produced 50% faster burning rates than smaller (" @default.
- W2912263534 created "2019-02-21" @default.
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- W2912263534 date "2019-05-01" @default.
- W2912263534 modified "2023-10-01" @default.
- W2912263534 title "Confined flame propagation of Al/PTFE mechanically activated composites" @default.
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- W2912263534 doi "https://doi.org/10.1016/j.combustflame.2018.08.024" @default.
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