Combustion characteristic and aging behavior of bimetal thermite powders

Nie, Hongqi; Chan, Hay Yee Serene; Pisharath, Sreekumar; Hng, Huey Hoon

doi:10.1016/j.dt.2020.05.009

Cited by 19 publications

(4 citation statements)

References 36 publications

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“…[28,29] Despite the active experimental research effo1t into nanothermites over the three last decades, the literature specifically declicated to aging studies is notably rar•e whereas this is a crucial point for their fmther deployment in current and future applications, not only for safe handling and storage but also to anticipate the aging effects through the design in order to avoid malfunctioning of microenegetic systems incorporating nanothemutes. Only two explorato1y experimental works [30,31] showed that aging effects do exist in alununized nanothemutes, but the literature Jacks of a rigorous study of the effects of temperature content was 69% by mass, calculated from thermogravimetric analysis before use. Copper oxide (CuO, ~100 nm), iron oxide (Fe 2 O 3 , ~50 nm), iron oxide (Fe 3 O 4 , 50 -100 nm) and cobalt oxide (Co 3 O 4 , ~50 nm) purchased from Sigma-Aldrich were directly used as received.…”

Section: Introductionmentioning

confidence: 99%

Unexpected enhanced reactivity of aluminized nanothermites by accelerated aging

Lahiner²,

Tenailleau³

et al. 2021

Chemical Engineering Journal

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Section: Introductionmentioning

confidence: 99%

Unexpected enhanced reactivity of aluminized nanothermites by accelerated aging

Lahiner²,

Tenailleau³

et al. 2021

Chemical Engineering Journal

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“…Yang [30] studied the mechanical properties of Ternary energetic structural material NiÀ AlÀ CuO under quasi-static-state and dynamic compression conditions. Nie et al [31] investigated the combustion characteristic and aging behavior of Al/Fe 2 O 3 nanothermite mixtures by adding micronscale nickel, found the bimetal thermite powders have a more complete combustion and better aging resistance. The microstructure, thermal, physical and mechanical properties of the AlÀ Ni composites, as a type of RSMs, has been studied [32], and the thermal properties of the AlÀ NiÀ CuO composites showed that the general addition of CuO particles had a negative impact on the energy release of the AlÀ Ni composites.…”

Section: Introductionmentioning

confidence: 99%

Study on combustion characteristics and pyrotechnic cutting effects of bimetal thermite Ni/Al/Fe₂O₃ system

Li,

Han,

Jiang

et al. 2024

Propellants Explo Pyrotec

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Nano‐thermite has become a subject of significant interest in the composite energetic materials field due to its high energy release rate. To cater to diverse engineering needs, thermite formulations are often customized to fulfill specific criteria. This study investigates the potential of metal nickel (Ni) as an additive to modify nano‐thermite formulations, selected for its optimal calorific values and chemical reactivity. The base materials, nano‐aluminum (Al) and iron oxide (Fe2O3), are blended with varying mass ratios of Ni (1 %, 3 %, 5 %, 7 %, 9 %) using the wet ball milling method. Pre‐reaction and post‐reaction morphological and compositional alterations in the resultant thermite samples are scrutinized through SEM and XRD characterization tests. Moreover, DSC analysis and combustion experiments were conducted to examine the pyrolysis and combustion behaviors of the evaluated samples. The results reveal a reduced exothermic peak on the DSC curves with the introduction of Ni, making the liquid‐solid (L‐S) phase reaction more challenging compared to the Al/Fe2O3 thermite. Intriguingly, Ni addition progressively decreases the combustion temperature of thermites as the Ni's mass ratio increases, with a peak efficiency at 7 % in the perforation tests on stainless‐steel plates. This research further reveals that the thermite reaction mechanism is a combined consequence of the “pre‐ignition‐fusion” and “fusion‐diffusion” mechanisms. These insights can provide valuable guidance for designing thermite formulations for potential applications in storage, management, and pyrotechnic cutting areas.

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“…Furthermore, they can be altered in different ways to change their explosive performances. One common alteration is the addition of various components, such as aluminium (Al) powder [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Identification of Aluminium Powder Properties for Modelling Free Air Explosions

Sielicki

Clutter²,

Sumelka

et al. 2022

Materials

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Aluminium is a component in many energetic formulations. Therefore, its combustion is one of the main thermochemical processes that govern the output from the energetics. Modelling aluminium combustion is a challenging task because the process is highly complex and difficult to measure. Here, tests of aluminium powder were conducted in an effort to isolate the burning of the aluminium and to determine an adequate representation of this process. Charges of 100 g and 500 g were tested, and the size of the Al/air cloud and the ratio of components in the Al/air mixture were determined, which has not been published previously. This information was used to assess the validity of the assumption that the detonation of the mixture was representative of the event. Parameters for the Jones–Wilkins–Lee equation of state for the explosive mixture and detonation products were defined. Simulations of the tests were performed, and the results were consistent with the field test data, indicating that detonation occurred when there was a mixture of 70–75% Al and 25–30% air by mass.

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Combustion characteristic and aging behavior of bimetal thermite powders

Cited by 19 publications

References 36 publications

Unexpected enhanced reactivity of aluminized nanothermites by accelerated aging

Unexpected enhanced reactivity of aluminized nanothermites by accelerated aging

Study on combustion characteristics and pyrotechnic cutting effects of bimetal thermite Ni/Al/Fe₂O₃ system

Identification of Aluminium Powder Properties for Modelling Free Air Explosions

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Combustion characteristic and aging behavior of bimetal thermite powders

Cited by 19 publications

References 36 publications

Unexpected enhanced reactivity of aluminized nanothermites by accelerated aging

Unexpected enhanced reactivity of aluminized nanothermites by accelerated aging

Study on combustion characteristics and pyrotechnic cutting effects of bimetal thermite Ni/Al/Fe2O3 system

Identification of Aluminium Powder Properties for Modelling Free Air Explosions

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Study on combustion characteristics and pyrotechnic cutting effects of bimetal thermite Ni/Al/Fe₂O₃ system