Thermal reactivity of metastable metal-based fuel Al/Co/AP: Mutual interaction mechanisms of the components

Yang, Sen; Meng, Ke-Juan; Xie, Wuxi; Nie, Hongqi; Yan, Qi‐Long

doi:10.1016/j.fuel.2022.123203

Cited by 23 publications

(2 citation statements)

References 38 publications

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“…Although the onset decomposition temperature is increased, the overall decomposition process is slightly accelerated because of the subsequent exothermic reaction. The thermal decomposition process of pure AP involves three stages: phase transition stage, low-temperature decomposition (LTD) stage, and high-temperature decomposition (HTD) stage. , It can also be seen that there is an unexpectedly strong catalytic effect on AP decomposition, whose end decomposition temperatures of AP in AHFPs are decreased by 100–150 °C. Thus, the application of a fluorine-containing protective coating could both enhance the stability of AlH 3 and facilitate the decomposition of AP.…”

Section: Resultsmentioning

confidence: 99%

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%

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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“…(i) The Al/Co nanocomposites were prepared by using a planetary high-energy ballmiller facility (XQW-2-DW, Changsha, China). More specific details regarding the preparation process of the Al/Co composite can be found in the recently published articles by our research group [30]. (ii) Afterwards, 2.98 mg of RDX was dissolved in 50 mL of a DMSO solvent and then subjected to violent magnetic stirring for approximately 30 min.…”

Section: Preparation Methodsmentioning

confidence: 99%

Enhancing RDX Thermal Decomposition in Al@RDX Composites with Co Transition Metal Interfacial Layer

Yang,

Xie,

Wang

et al. 2024

Aerospace

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In this study, an Al/Co@RDX composite was meticulously prepared through a combination of planetary high-energy ball-milling and a spray-drying technique. The thermal reactivity of these Al/Co@RDX composites was comprehensively investigated and compared using the TG/DSC technique. It is shown that the initial decomposition temperature of RDX in the DSC curve was decreased by 26.3 °C in the presence of Al/Co, which could be attributed to the nano-sized Co transition metal catalyzing the decomposition reaction of nitrogen oxides in RDX decomposition products. The decomposition peak temperature of RDX and the heat released by the thermal decomposition of RDX in the Al/Co@RDX composite were decreased by 26.3 °C and increased by 74.5 J·g−1, respectively, in comparison with those of pure RDX. The types of major gaseous products released from Al/Co@RDX were found to be identical to those of pure RDX, encompassing N2O, CH2O, CO2 and HCN. However, the concentrations of those gaseous products for Al/Co@RDX were higher than those observed for pure RDX, which may owe to the fact that the Al/Co composite can interact with the –CH2 and –NO2 within RDX molecules, which leads to the weakening of the C-N and N-N bonds. In addition, the decomposition of RDX in the Al/Co@RDX composite was observed as a one-step process with an apparent activation energy (Ea) of 115.6 kJ·cm−3. The decomposition mechanism of the RDX in the Al/Co@RDX composite was identified to follow the chain scission model (L2), whereas the two-step decomposition physical models observed for pure RDX were found to closely resemble the L2 and autocatalytic models.

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Interfacial charge mismatch enhanced energetic crystals for efficient energy-release and improved safety

Zhang²,

et al. 2022

Sci. China Mater.

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The synergistic enhancement of energy-release and safety performance is significant for energetic crystals (ECs), such as 3-nitro-1,2,4-triazole-5-one (NTO) and ammonium perchlorate (AP). However, the sluggish energy-release kinetics, high decomposition temperature, and unsatisfied safety performance have plagued the high-efficiency applications of NTO and AP. Herein, graphene oxide (GO) was utilized to ameliorate the physicochemical features and performance characteristics of NTO and AP using a confined crystallization strategy in liquid nitrogen (LN-NTO@GO and LN-AP@GO). Lamellar GO could act as a lubricant, leading to an excellent improvement in mechanical safety performance. Besides, many functional groups in GO could act as building blocks and active sites for the confined crystallization of ECs. Theoretical investigations indicate an interfacial charge mismatch at the GO-EC interface. The asobtained LN-NTO@GO and LN-AP@GO energetic nanocomposites demonstrate promoted exothermic decomposition temperatures of 18.2 and 70.1°C with substantially accelerated kinetics compared with pristine counterparts and samples crystallized naturally. Reasonable interfacial engineering by interfacial charge mismatch between the catalyst and ECs would break new grounds for designing fast energy-release and safe operation of energetic materials.

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Thermal reactivity of metastable metal-based fuel Al/Co/AP: Mutual interaction mechanisms of the components

Cited by 23 publications

References 38 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

Enhancing RDX Thermal Decomposition in Al@RDX Composites with Co Transition Metal Interfacial Layer

Interfacial charge mismatch enhanced energetic crystals for efficient energy-release and improved safety

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Thermal reactivity of metastable metal-based fuel Al/Co/AP: Mutual interaction mechanisms of the components

Cited by 23 publications

References 38 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

Enhancing RDX Thermal Decomposition in Al@RDX Composites with Co Transition Metal Interfacial Layer

Interfacial charge mismatch enhanced energetic crystals for efficient energy-release and improved safety

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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