A comparative study of thermal kinetics and combustion performance of Al/CuO, Al/Fe2O3 and Al/MnO2 nanothermites

Song, Jiaxing; Guo, Tao; Yao, Miao; Chen, Jialin; Wen, Deliang; Bei, Fengli; Mao, Y.; Yu, Zhongshen; Huang, Junyi; Zhang, Xiaonan; Yin, Qiang; Wang, Shuo

doi:10.1016/j.vacuum.2020.109339

Cited by 36 publications

(13 citation statements)

References 27 publications

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“…The activation energies are 252.2, 177.3, and 178.6 kJ·mol –1 for the CuO/Al, CuO@Ni/Al, and CuO@NiO/Al films, respectively. Similarly, the reported activation energy of the CuO/Al nanoparticle is 246.8 kJ·mol –1 , which value is close to that of the CuO/Al nanowire film prepared here. The activation energies of the CuO@Ni/Al and CuO@NiO/Al systems are 70.3% and 70.8% of the values of the CuO/Al system, respectively, which decrease as a result of enhanced reactivity.…”

Section: Resultssupporting

confidence: 85%

Effect of the Ni and NiO Interface Layer on the Energy Performance of Core/Shell CuO/Al Systems

Chen

Ren

et al. 2020

Langmuir

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The interface layer is responsible for the outward migration of oxygen atoms, which subsequently leads to an adjustment in the energetic performance of nanothermite films. In this study, sandwich-structured CuO@Ni/Al and CuO@NiO/Al nanowire thermite films were successfully prepared to investigate the effects of the interface layer on the heat-release, ignition, and combustion performance. The effects of the Ni and NiO interface layers are extremely different on the heat-release performance and combustion properties of the CuO/Al nanowire thermite film. Herein, the introduced Ni layer decreased the heat release (1979.7 J/g), reactivity (E a = 177.3 kJ/mol), and maximum pressure (2.32 MPa) compared with the CuO/Al composite. Al/Ni alloys can be formed at the interface to prevent oxygen from diffusing between CuO and Al. Moreover, the incorporation of the Ni interface layer into the CuO/Al systems results in a heat drop due to its heat-absorption capability as well as its blockage of heat transfer from the thermite reaction. The deposition of the NiO layer between CuO and Al leads to an increase in the heat release (3014.2 J/g) and a decrease in the activation energy (E a = 178.6 kJ/mol). The NiO layer endows the CuO/Al system with a high energy-release rate and chemical reactivity. NiO can participate in a thermite reaction, which promotes the reaction of CuO/Al and induces the condensed phase.

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Section: Resultssupporting

confidence: 85%

Effect of the Ni and NiO Interface Layer on the Energy Performance of Core/Shell CuO/Al Systems

Chen

Ren

et al. 2020

Langmuir

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“…There were previously many studies on the properties of single-morphological MnO 2 thermites. Researchers have conducted in-depth studies on the effects of different oxides, additive components, and different particle sizes of Al on the thermodynamics and combustion performance of Al/MnO 2 thermite [17][18][19][20]. However, the effects of different morphologies of MnO 2 on the thermite properties have not been systematically studied.…”

Section: Introductionmentioning

confidence: 99%

Effect of MnO₂ morphology on the thermal properties and combustion behavior of nano-Al/MnO₂ thermite

Liu

Liu²,

Zhao³

et al. 2022

Mater. Res. Express

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Al/granular MnO2 and Al/rod MnO2 thermite samples were prepared to investigate the effects of different morphologies of MnO2 on the thermal properties and combustion behavior of nano-Al/MnO2 thermite. The morphology and thermal properties of the thermite were characterized by field emission scanning electron microscopy (FE-SEM), X-ray diffractometry (XRD), and differential scanning calorimetry (DSC). DSC results show that the Al/rod MnO2 releases 1274.39 J·mol−1 heat, which is 292.58 J·mol−1 more than the Al/granular MnO2. The initial reaction temperature of Al/rod MnO2 is 567.39 ˚C, which is delayed by 17.39 ˚C versus 550 ˚C of Al/granular MnO2. Non-isothermal thermodynamic analysis was used to measure the activation energy of Al/rod MnO2 to be 234.36 kJ·mol−1, which is 46.53 kJ·mol−1 higher than that of Al/granular MnO2. This corresponds to an increase in the ignition temperature in the DSC curve and in-dicating a higher safety profile. In the open burning experiment, the burning time of Al/granular MnO2 was longer and sparks sputtered around the flame. The Al/rod MnO2 has a large combustion flame and a fast combustion rate. The light intensity peaks of the two groups of samples are close in the light intensity test. The light intensity existence time of Al/rod MnO2 is 0.0146 s, which is 0.094 s shorter than Al/granular MnO2. This shows that the combustion rate of Al/rod MnO2 is much faster than that of Al/granular MnO2. The closed-tube combustion experiment shows that the combustion wave velocity of Al/rod MnO2 increases first and then decreases; the maximum wave velocity reaches 339.6 m·s−1, and Al/granular MnO2 cannot self-propagate combustion in the microporous environment. In the constant volume combustion exper-iment, the peak combustion pressure of Al/rod MnO2 is 0.938 Mpa, and the peak value of Al/granular MnO2 combustion pressure is 0.581 Mpa; the difference is obvious. This shows that the rod MnO2 gas production performance is better. According to the duration of the pressure peak, the burning speed of Al/rod MnO2 in the light intensity test is confirmed again to be much faster than that of Al/granular MnO2. The Al/rod MnO2 is better than Al/granular MnO2 in thermal and combustion performance and is also safer. This provides a basis for future performance and safety research on aluminothermic materials.

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“…At present, the theoretical and experimental researches on the flyer velocity of exploding foil initiators is relatively mature, and a variety of velocity testing techniques of small flyers have been mastered. Moreover, the various parameters of the exploding foil initiator on the flyer velocity have also been investigated from a macro point of view [15][16][17]. The macroscopic properties of materials depend not only on their chemical composition, but also, to a greater extent, on their micromorphology and grain size [18,19].…”

Section: Introductionmentioning

confidence: 99%

Effect of Grain Size and Micromorphology of Cu Foil on the Velocity of Flyer of Exploding Foil Detonator

Han

Deng

Chu³

et al. 2021

Applied Sciences

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In this paper, the effect of grain size and micromorphology of Cu foil on the velocity of the flyer of an exploding foil detonator was studied. A Cu foil with different grain sizes and micromorphologies was prepared by the physical vapor deposition sputtering method. The flyer velocity of the Cu foil was measured by the photon Doppler technique (PDT). The influence of the grain size and micromorphology of the Cu foil (which was the core transducer of the exploding foil detonator) on the flyer velocity and reacted morphology was discussed. The results show that the grain size and micromorphology of the Cu film can greatly affect the velocity and morphology of the flyer. The grain size of the Cu film is more uniform, and the stimulus response in the middle area of the bridge foil is more concentrated. In addition, the current density becomes more uniform, resulting in a better explosion performance. Consequently, the speed of the formed flyer becomes higher, leading to a smoother flyer surface, which is more conductive to energy conversion.

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A comparative study of thermal kinetics and combustion performance of Al/CuO, Al/Fe2O3 and Al/MnO2 nanothermites

Cited by 36 publications

References 27 publications

Effect of the Ni and NiO Interface Layer on the Energy Performance of Core/Shell CuO/Al Systems

Effect of the Ni and NiO Interface Layer on the Energy Performance of Core/Shell CuO/Al Systems

Effect of MnO₂ morphology on the thermal properties and combustion behavior of nano-Al/MnO₂ thermite

Effect of Grain Size and Micromorphology of Cu Foil on the Velocity of Flyer of Exploding Foil Detonator

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A comparative study of thermal kinetics and combustion performance of Al/CuO, Al/Fe2O3 and Al/MnO2 nanothermites

Cited by 36 publications

References 27 publications

Effect of the Ni and NiO Interface Layer on the Energy Performance of Core/Shell CuO/Al Systems

Effect of the Ni and NiO Interface Layer on the Energy Performance of Core/Shell CuO/Al Systems

Effect of MnO2 morphology on the thermal properties and combustion behavior of nano-Al/MnO2 thermite

Effect of Grain Size and Micromorphology of Cu Foil on the Velocity of Flyer of Exploding Foil Detonator

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Effect of MnO₂ morphology on the thermal properties and combustion behavior of nano-Al/MnO₂ thermite