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Aluminum–Iodoform Composite Reactive Material
Author(s) -
Abraham Ani,
Zhang Shasha,
Aly Yasmine,
Schoenitz Mirko,
Dreizin Edward L.
Publication year - 2014
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201300400
Subject(s) - materials science , iodoform , thermogravimetric analysis , gravimetric analysis , ball mill , composite number , autoignition temperature , composite material , aluminium , iodine , combustion , chemical engineering , metallurgy , chemistry , organic chemistry , engineering
Mechanically alloyed aluminum–iodoform composites were prepared with iodine concentration of 20 wt%. Ball milling at both room temperature and liquid nitrogen temperature was explored. Material characterization by electron microscopy and X‐ray diffraction showed no difference between samples milled at different temperatures. However, samples prepared at room temperature aged rapidly. Thermo‐gravimetric measurements quantifying release of iodine upon heating confirmed that cryogenic milling was necessary to stabilize iodoform in the Al‐matrix. Iodine was released upon heating in four distinct stages. The oxidation of the prepared materials was also studied using thermo‐gravimetric analysis and two main oxidation steps were detected. The ignition temperatures were determined for powders coated onto a metal filament heated electrically at 10 3 –10 4 K min −1 . The ignition temperatures of the prepared materials were noticeably lower compared to the Al · I 2 composite prepared using a similar cryo‐milling approach. The combustion characteristics determined using constant volume explosions of aerosolized powders were found to be similar to those of Al · I 2 composite. The maximum pressure and rate of pressure rise observed in the latter experiments were greater than for pure aluminum powders with comparable particle sizes.