TY - JOUR
T1 - Preparation and characterization of energetic Al-Mg mechanical alloy powders
AU - Shoshin, Yuriy L.
AU - Mudryy, Ruslan S.
AU - Dreizin, Edward L.
N1 - Funding Information:
This work has been supported by the US Office of Naval Research, Award N000140010446 and by New Jersey Commission on Science and Technology establishing a Center for Engineered Particulates at NJIT.
PY - 2002
Y1 - 2002
N2 - Metals such as Al and Mg have high combustion enthalpies and they are widely used as additives in energetic materials for propellants, explosives, and pyrotechnics. However, long ignition delays and slow combustion kinetics limit their current applications. An approach suggested in this work is to design new metal-based materials in which pre-determined phase changes will occur and trigger ignition at a desired temperature and also accelerate the rate of heat release during combustion. As a first step, metastable solid solutions of Mg in Al (10-50% of Mg) have been produced by mechanical alloying. The ignition temperatures of the produced alloys in air were determined using digital imaging and three-color pyrometry of the electrically heated filaments coated with different alloy powders. Combustion of mechanical alloys in air was studied using a laminar, premixed flame aerosol burner. The ignition temperatures were around 1,000 K, much lower than the pure aluminum ignition temperature of about 2,300 K. The steady flames of mechanical alloy powders were produced at lower equivalence ratios and had higher propagation velocities than similar pure aluminum powder flames. Phase compositions of the combustion products were determined using X-ray diffraction. In addition to Al2O3 and MgO, significant amounts of Al2MgO4 were found in experiments.
AB - Metals such as Al and Mg have high combustion enthalpies and they are widely used as additives in energetic materials for propellants, explosives, and pyrotechnics. However, long ignition delays and slow combustion kinetics limit their current applications. An approach suggested in this work is to design new metal-based materials in which pre-determined phase changes will occur and trigger ignition at a desired temperature and also accelerate the rate of heat release during combustion. As a first step, metastable solid solutions of Mg in Al (10-50% of Mg) have been produced by mechanical alloying. The ignition temperatures of the produced alloys in air were determined using digital imaging and three-color pyrometry of the electrically heated filaments coated with different alloy powders. Combustion of mechanical alloys in air was studied using a laminar, premixed flame aerosol burner. The ignition temperatures were around 1,000 K, much lower than the pure aluminum ignition temperature of about 2,300 K. The steady flames of mechanical alloy powders were produced at lower equivalence ratios and had higher propagation velocities than similar pure aluminum powder flames. Phase compositions of the combustion products were determined using X-ray diffraction. In addition to Al2O3 and MgO, significant amounts of Al2MgO4 were found in experiments.
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U2 - 10.1016/S0010-2180(01)00351-0
DO - 10.1016/S0010-2180(01)00351-0
M3 - Article
AN - SCOPUS:0036174480
SN - 0010-2180
VL - 128
SP - 259
EP - 269
JO - Combustion and Flame
JF - Combustion and Flame
IS - 3
ER -