Organically-Capped, Nanoscale Alkali Metal Hydride and Aluminum Particles as Solid Propellant Additives

Lawrence, Adam R.; Laktas, Jacob M.; Place, Greg J.; Jelliss, Paul A.; Buckner, Steven W.; Sippel, Travis R.

doi:10.2514/1.b37409

Cited by 8 publications

(3 citation statements)

References 35 publications

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“…Simple and complex hydrides have been revealed for several years as interesting fuels to substitute Al in composite propellants [14][15][16][17][18][19][20]. They can improve the performance and decrease the agglomeration process during combustion.…”

Section: Introductionmentioning

confidence: 99%

Effect of Complex Metal Hydrides on the Elimination of Hydrochloric Acid Exhaust Products from High‐Performance Composite Solid Propellants: A Theoretical Analysis

Chalghoum

Maggi

Benziane³

2020

Propellants Explo Pyrotec

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Ammonium perchlorate (AP)-based solid rocket propellants generate hydrochloric acid (HCl) as an exhaust product during combustion. This latter displays numerous environmental problems such as the depletion of the ozone layer and the increase of the concentration of acid rains. This paper offers a theoretical analysis concerning the employment of metal hydrides as efficient additives to mitigate some of the negative effects of HCl on the environment during the combustion of AP-based composite propellants. Nine complex metal hydrides, expected to generate desirable performance gains, are selected to assess their scavenging effect on the HCl during propellant combustion. Based on NASA Lewis Code, Chemical Equilibrium with Application (CEA), comparative analysis of the theoretical performance of specific impulse, adiabatic flame temperatures, condensed combustion products as well as the exhaust gaseous species has been carried out. This study reveals that complex metal hydrides-based propellants exhibited better performance than those containing simple metal hydrides, showing a synergetic effect of high specific impulse and low environmental impact. It is consequently anticipated that a good choice of metal hydride can provide clean/green propellant formulations that can satisfy the current environmental requirements with better performance than current aluminum propellants.

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Section: Introductionmentioning

confidence: 99%

Effect of Complex Metal Hydrides on the Elimination of Hydrochloric Acid Exhaust Products from High‐Performance Composite Solid Propellants: A Theoretical Analysis

Chalghoum

Maggi

Benziane³

2020

Propellants Explo Pyrotec

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“…Their decomposition can release large amounts of hydrogen, which allows them to release more energy and decline the average molecular weight of the gas in the combustion process. 8 , 9 Common metal hydrides include MgH 2 , CaH 2 , AlH 3 , and so forth. Among these metal hydrides, the application of AlH 3 is considered important for the development of EMs because of its high hydrogen storage capacity (10.1%).…”

Section: Introductionmentioning

confidence: 99%

“…However, some studies have found that metal hydrides can replace metals as better additives to mix with EMs. , Compared with metal power, metal hydrides possess high hydrogen storage capacity and higher combustion heat. Their decomposition can release large amounts of hydrogen, which allows them to release more energy and decline the average molecular weight of the gas in the combustion process. , Common metal hydrides include MgH 2 , CaH 2 , AlH 3 , and so forth. Among these metal hydrides, the application of AlH 3 is considered important for the development of EMs because of its high hydrogen storage capacity (10.1%). , At present, AlH 3 has been successfully applied in solid propellants as an active additive.…”

Section: Introductionmentioning

confidence: 99%

Thermal Decomposition Mechanism of 1,3,5,7-Tetranitro-1,3,5,7-tetrazocane Accelerated by Nano-Aluminum Hydride (AlH₃): ReaxFF-Lg Molecular Dynamics Simulation

Zhao

Mei

Zhao³

et al. 2020

ACS Omega

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ReaxFF-low-gradient reactive force field with CHONAl parameters is used to simulate thermal decomposition of 1,3,5,7-tetranitro-1,3,5,7-tetrazocane (HMX) and AlH 3 composite. Perfect AlH 3 and surface-passivated AlH 3 particles were constructed to mix with HMX. The simulation results indicate HMX is adsorbed on the surface of particles to form O–Al and N–Al bonds. The decomposition of HMX and AlH 3 composite is an exothermic reaction without energy barrier, but the decomposition of pure HMX needs to overcome the energy barrier of 133.57 kcal/mol. Active nano-AlH 3 causes HMX to decompose rapidly at low temperature, and the primary decomposition pathway is the rupture of N–O and C–N bonds. Adiabatic simulation shows that the energy release and temperature increase of HMX/AlH 3 is much larger than those of the HMX system. Surface-passivated AlH 3 particles only affect the initial decomposition rate of HMX. In HMX and AlH 3 composites, the strong attraction of Al in AlH 3 to O and the activation of the intermediate reaction by H 2 cause HMX to decompose rapidly. The final decomposition products of pure HMX are H 2 O, N 2 , and CO 2 , and those of HMX/AlH 3 are H 2 O, N 2 , and Al-containing clusters dominated by C–Al. The final gas production shows that the specific impulse of HMX/AlH 3 is larger than that of HMX.

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Effect of Different Binders and Metal Hydrides on the Performance and Hydrochloric Acid Exhaust Products Scavenging ofAP‐Based Composite Solid Propellants: A Theoretical Analysis

Chalghoum¹,

M'cili²,

Benziane³

et al. 2023

Nano and Micro‐Scale Energetic Materials

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Organically-Capped, Nanoscale Alkali Metal Hydride and Aluminum Particles as Solid Propellant Additives

Cited by 8 publications

References 35 publications

Effect of Complex Metal Hydrides on the Elimination of Hydrochloric Acid Exhaust Products from High‐Performance Composite Solid Propellants: A Theoretical Analysis

Effect of Complex Metal Hydrides on the Elimination of Hydrochloric Acid Exhaust Products from High‐Performance Composite Solid Propellants: A Theoretical Analysis

Thermal Decomposition Mechanism of 1,3,5,7-Tetranitro-1,3,5,7-tetrazocane Accelerated by Nano-Aluminum Hydride (AlH₃): ReaxFF-Lg Molecular Dynamics Simulation

Effect of Different Binders and Metal Hydrides on the Performance and Hydrochloric Acid Exhaust Products Scavenging ofAP‐Based Composite Solid Propellants: A Theoretical Analysis

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Organically-Capped, Nanoscale Alkali Metal Hydride and Aluminum Particles as Solid Propellant Additives

Cited by 8 publications

References 35 publications

Effect of Complex Metal Hydrides on the Elimination of Hydrochloric Acid Exhaust Products from High‐Performance Composite Solid Propellants: A Theoretical Analysis

Effect of Complex Metal Hydrides on the Elimination of Hydrochloric Acid Exhaust Products from High‐Performance Composite Solid Propellants: A Theoretical Analysis

Thermal Decomposition Mechanism of 1,3,5,7-Tetranitro-1,3,5,7-tetrazocane Accelerated by Nano-Aluminum Hydride (AlH3): ReaxFF-Lg Molecular Dynamics Simulation

Effect of Different Binders and Metal Hydrides on the Performance and Hydrochloric Acid Exhaust Products Scavenging ofAP‐Based Composite Solid Propellants: A Theoretical Analysis

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Thermal Decomposition Mechanism of 1,3,5,7-Tetranitro-1,3,5,7-tetrazocane Accelerated by Nano-Aluminum Hydride (AlH₃): ReaxFF-Lg Molecular Dynamics Simulation