TY - GEN
T1 - Chemical gas generators based on mechanically alloyed Al-Mg powder
AU - Machado, Marco A.
AU - Rodriguez, Daniel A.
AU - Dreizin, Edward L.
AU - Shafirovich, Evgeny
N1 - Publisher Copyright:
© 2015 Materials Research Society.
PY - 2015
Y1 - 2015
N2 - Because of the high energy density, easy ignition, and good storability, mechanically alloyed Al·Mg powder has the potential to improve the performance characteristics of various energetic and gas-generating materials. Here, the use of this powder in combustible mixtures for generation of oxygen and hydrogen is explored. The mixtures for oxygen generation consisted of sodium chlorate, nanoscale cobalt oxide catalyst, and Al·Mg powder, while those for hydrogen generation included water, Polyacrylamide as a gellant, and Al-Mg powder. To increase hydrogen yield, ammonia borane (NH3BH3) was also added to Al·Mg - water mixtures. Combustion experiments were conducted in an argon environment, using laser ignition. The thermal wave propagation over the oxygen-generating mixtures was studied using infrared video recording. It has been shown that mechanically alloyed Al·Mg material is a promising alternative to currently used iron because significantly smaller amounts of this additive are needed for a steady propagation of the combustion wave. The hydrogen generation experiments have shown that mixtures of mechanically alloyed Al-Mg powder with 10-60 wt% gelled water are combustible, with the front velocities exceeding the values obtained for the mixtures of water with nanoscale Al. Hydrogen yield was measured using mass-spectrometry. In the mixtures that included ammonia borane, D2O was used instead of H2O. Measurements of H2, D2, and HD concentrations in the product gas provided insight into the reaction mechanisms. The isotopic tests have shown that AB participates in two parallel processes - thermolysis and hydrolysis, thus increasing hydrogen yield.
AB - Because of the high energy density, easy ignition, and good storability, mechanically alloyed Al·Mg powder has the potential to improve the performance characteristics of various energetic and gas-generating materials. Here, the use of this powder in combustible mixtures for generation of oxygen and hydrogen is explored. The mixtures for oxygen generation consisted of sodium chlorate, nanoscale cobalt oxide catalyst, and Al·Mg powder, while those for hydrogen generation included water, Polyacrylamide as a gellant, and Al-Mg powder. To increase hydrogen yield, ammonia borane (NH3BH3) was also added to Al·Mg - water mixtures. Combustion experiments were conducted in an argon environment, using laser ignition. The thermal wave propagation over the oxygen-generating mixtures was studied using infrared video recording. It has been shown that mechanically alloyed Al·Mg material is a promising alternative to currently used iron because significantly smaller amounts of this additive are needed for a steady propagation of the combustion wave. The hydrogen generation experiments have shown that mixtures of mechanically alloyed Al-Mg powder with 10-60 wt% gelled water are combustible, with the front velocities exceeding the values obtained for the mixtures of water with nanoscale Al. Hydrogen yield was measured using mass-spectrometry. In the mixtures that included ammonia borane, D2O was used instead of H2O. Measurements of H2, D2, and HD concentrations in the product gas provided insight into the reaction mechanisms. The isotopic tests have shown that AB participates in two parallel processes - thermolysis and hydrolysis, thus increasing hydrogen yield.
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U2 - 10.1557/opl.2015.287
DO - 10.1557/opl.2015.287
M3 - Conference contribution
AN - SCOPUS:84938919079
T3 - Materials Research Society Symposium Proceedings
SP - 26
EP - 37
BT - Recent Advances in Reactive Materials
A2 - Adams, D.
A2 - Sullivan, K.
A2 - Dreizin, E.
A2 - Hng, H. H.
PB - Materials Research Society
T2 - 2014 MRS Fall Meeting
Y2 - 30 November 2014 through 5 December 2014
ER -