Enhanced stability and combustion performance of AlH3 in combination with commonly used oxidizers

Yu, Minghui; Yang, Sen; Xie, Wuxi; Zhu, Zhaoyang; Li, Heping; Yan, Qi‐Long

doi:10.1016/j.fuel.2022.125741

Cited by 19 publications

(14 citation statements)

References 43 publications

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“…On the basis of Figure ( R 2 = 0.98), the optimal mass fraction of AP content was found to be 64.21% with maximum heat release. Moreover, the optimized value also corresponds to the result in our previous paper . Then, the sample of AHFPs with 64.21 wt % of AP content was also prepared via the mechanical mixing method, and its heat of explosion was 8975.5 J·g –1 .…”

Section: Resultsmentioning

confidence: 99%

“…Our previous work also showed that the stability and combustion performance of AlH 3 have been both improved in combination with AP . However, the interaction mechanisms of AlH 3 and fluorine-containing polymers are still unclear, and the experimental investigations are also lacking.…”

Section: Introductionmentioning

confidence: 99%

“…Generally speaking, there are two kinds of coating layers on the basis of whether they can be used as an energetic component. The first is a nonenergetic layer, such as NO, N 2 F 4 , or stearic acid, and the second type is an energetic layer, like nitrocellulose and FE26. , However, the inert Al 2 O 3 layers negatively impact the ignition and combustion properties, which would increase the ignition temperature and ignition delay time. Therefore, the ideal coating layer should not only reduce or eliminate the Al 2 O 3 layer but also enhance the stability of AlH 3 at the same time.…”

Section: Introductionmentioning

confidence: 99%

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Stabilization of AlH₃ Crystals by the Coating of Hydrophobic PFPE and Resulted Reactivity with Ammonium Perchlorate

Yang

Xie³

et al. 2023

Langmuir

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Aluminum hydride (AlH 3 ) is a promising fuel component of solid propellant, but its stabilization is still challenging. Herein, surface functionalization of hydrophobic perfluoropolyether (PFPE) followed by ammonium perchlorate (AP) coating has been implemented. In particular, AlH 3 @PFPE@xAP (x = 10, 30, 50, or 64.21%) composites (AHFPs) were prepared by a spraydrying technique. The PFPE-functionalized AlH 3 with a hydrophobic surface shows an increased water contact angle (WCA) from 51.87°to 113.54°. Compared with pure AlH 3 , the initial decomposition temperatures of AHFPs were increased by 17 °C, and the decomposition properties of AP in the AHFPs were also enhanced with significantly decreased peak temperature and fairly increased energy output. Moreover, the decomposition induction time of AHFPs-30% was improved by almost 1.82 times that of raw AlH 3 , which indicates that the coatings of PFPE and AP could improve the stability of AlH 3 . The maximum flame radiation intensity of AHFPs-30% was 21.6 × 10 3 , which is almost 7.71 times that of pure AlH 3 (2.8 × 10 3 ).

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Stabilization of AlH₃ Crystals by the Coating of Hydrophobic PFPE and Resulted Reactivity with Ammonium Perchlorate

Yang

Xie³

et al. 2023

Langmuir

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“…[ 20 ] coated polydopamine (PDA) on the α‐AlH 3 surface through simple situ polymerization and the PDA could effectively prevent the reaction of α‐AlH 3 with water and also made the thermal stability of α‐AlH 3 increase significantly. The composite of ammonium perchlorate (AP) with α‐AlH 3 effectively improved its stability and increased the dehydrogenation induction time of α‐AlH 3 by 1.2 times [21] . The Al 2 O 3 coating formed by atomic layer deposition (ALD) gave α‐AlH 3 a low friction sensitivity and high thermal stability [22] …”

Section: Introductionmentioning

confidence: 99%

“…The composite of ammonium perchlorate (AP) with α-AlH 3 effectively improved its stability and increased the dehydrogenation induction time of α-AlH 3 by 1.2 times. [21] The Al 2 O 3 coating formed by atomic layer deposition (ALD) gave α-AlH 3 a low friction sensitivity and high thermal stability. [22] In recent years, pyrotechnic binders have been widely used in the stabilization modification of energetic materials for their good thermal stability and excellent mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Properties of Pyrotechnic Binder Encapsulated α‐AlH₃ Composites by Solvent/Anti‐solvent Method

Shi

et al. 2023

ChemNanoMat

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Alpha-aluminum hydride (α-AlH 3 ) is an ideal energetic combustion agent, but its poor stability and safety limit its application. Therefore, we prepare different composites by using the solvent/anti-solvent method to coat different pyrotechnic binders on the surface of α-AlH 3 . The vacuum stability test show that the minimum outgassing of Shellac-coated α-AlH 3 composite is only 1.2 mL/g at 50 °C for 6 days. Due to the good electrical insulation properties of Viton, Viton-coated α-AlH 3 composite have the highest E 50 value of electrostatic sensitivity. In addition, the pyrotechnic binders coating not only protects the activity of the α-AlH 3 but also effectively increases its burning rate. Viton-coated α-AlH 3 composite have more gaseous products and maximum flame area during combustion. This study illustrates that α-AlH 3 coated with pyrotechnic binders is a means to address its stability and safety, laying the foundation for its application in solid propellants.

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Pyrolysis mechanisms of commonly used oxidizers on the 5‐amino‐1H‐tetrazole

Zheng

Wang

Duo

et al. 2023

Propellants Explo Pyrotec

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As a novel energetic material, 5-Amino-1H-tetrazole (5AT) has a history of proposed applications in the fields of airbags, rocket engines, and new propellants. However, the application of 5AT is limited for its poor combustion stability. Identification of the thermal behaviour and pyrolysis mechanism of 5AT could provide guidance on the control of combustion behaviour, which can be effectively improved by adding oxidizers. In this paper, five kinds of oxidizers (Ammonium perchlorate (AP), Sodium perchlorate (NaClO 4 ), Ammonium nitrate (AN), Manganese oxide (MnO 2 ), and Chromic oxide (Cr 2 O 3 )) are mixed with 5AT for investigating the catalytic effects of multi-type oxidizers on 5AT. Thermal behaviour is analysed by the TG-DSC test and the thermal activation energy is evaluated by Kissinger and Ozawa methods. Moreover, TG-FTIR and TG-MS analyses are used to infer the pyrolysis gas products of 5AT/oxidant. The experimental results indicate that the 5AT-AN has the lowest activation energy, and the degradation process was simplified into one step. The addition of AP, NaClO 4 , and MnO 2 can promote the pyrolysis process of 5AT due to the redox reaction between melamine and the decomposition products of oxidizers, while the catalytic effect of Cr 2 O 3 mainly occurs above 400 °C without the occurrence of oxidation. The catalytic mechanism of Cr 2 O 3 mainly performs on the polyaddition and the ring-opening reaction of N-containing heterocycles. The findings of this work may offer valuable direction for understanding, designing, and using 5AT-based propellants.

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Enhanced stability and combustion performance of AlH3 in combination with commonly used oxidizers

Cited by 19 publications

References 43 publications

Stabilization of AlH₃ Crystals by the Coating of Hydrophobic PFPE and Resulted Reactivity with Ammonium Perchlorate

Stabilization of AlH₃ Crystals by the Coating of Hydrophobic PFPE and Resulted Reactivity with Ammonium Perchlorate

Preparation and Properties of Pyrotechnic Binder Encapsulated α‐AlH₃ Composites by Solvent/Anti‐solvent Method

Pyrolysis mechanisms of commonly used oxidizers on the 5‐amino‐1H‐tetrazole

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Enhanced stability and combustion performance of AlH3 in combination with commonly used oxidizers

Cited by 19 publications

References 43 publications

Stabilization of AlH3 Crystals by the Coating of Hydrophobic PFPE and Resulted Reactivity with Ammonium Perchlorate

Stabilization of AlH3 Crystals by the Coating of Hydrophobic PFPE and Resulted Reactivity with Ammonium Perchlorate

Preparation and Properties of Pyrotechnic Binder Encapsulated α‐AlH3 Composites by Solvent/Anti‐solvent Method

Pyrolysis mechanisms of commonly used oxidizers on the 5‐amino‐1H‐tetrazole

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Stabilization of AlH₃ Crystals by the Coating of Hydrophobic PFPE and Resulted Reactivity with Ammonium Perchlorate

Stabilization of AlH₃ Crystals by the Coating of Hydrophobic PFPE and Resulted Reactivity with Ammonium Perchlorate

Preparation and Properties of Pyrotechnic Binder Encapsulated α‐AlH₃ Composites by Solvent/Anti‐solvent Method