Thermal Properties and Kinetics of Al/α-MnO2 Nanostructure Thermite

Song, Jiaxing; Fang, Xiang; Guo, Tao; Bei, Fengli; Wen, Deliang; Zhang, Xiaonan; Yao, Miao; Yu, Hongjun

doi:10.21577/0103-5053.20170154

Cited by 6 publications

(9 citation statements)

References 22 publications

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“…MnO 2 nanorods (MnO 2 NRs) are synthesized via hydrothermal method at 140 o C for 12 h, please see Ref. [26][27]. Poly(VDFter-HFP-ter -TFE) terpolymer is selected from Shanghai 3F New Chemical Materials Co., LTD, with about 67.5% fluorine content.…”

Section: Methodsmentioning

confidence: 99%

Thermal and Combustion Behaviors of Aluminum/ Manganese Dioxide/ Fluoroelastomer Terpolymer Nanothermite

Song

Duan

Chen

et al. 2022

Preprint

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Fluoroelastomer has received increasing attention for energetic materials application due to its high fluorine contents. Different contents of poly(VDF-ter-HFP- ter- TFE) terpolymer are added into Al/MnO2 nanothermite. The peak exothermic temperature of thermite reaction for Al/MnO2 system is about 554 oC with 1070 Jg-1 heat release. After adding terpolymer, it mainly exists in the gap among Al nanoparticles and MnO2 nanorods, and can react with Al and MnO2 at the range of 350 oC to 540 oC before the occurrence of thermite reaction. 10wt% terpolymer has relatively little effect on the thermite reaction, and for the samples with higher terpolymer content, more nanothermite components reacts with terpolymer at early stage. Ignition and combustion performance show terpolymer can reduce ignition energy threshold by up to 9.82% and increase combustion duration time at least several times. The potential reasons for above results are analyzed. This work can shed light on application of fluoroelastomer in energetic-materials.

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Section: Methodsmentioning

confidence: 99%

Thermal and Combustion Behaviors of Aluminum/ Manganese Dioxide/ Fluoroelastomer Terpolymer Nanothermite

Song

Duan

Chen

et al. 2022

Preprint

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“…Some Al particles are attached to the surface of rod-shaped MnO 2 . Part of the Al powder agglomerates and adversely affects the exotherm and ignition [17], but most of the Al powder is uniformly dispersed. The mapping images better illustrate the uniformity of the sample's dispersion.…”

Section: Morphology and Crystal Form Analysismentioning

confidence: 99%

“…MnO 2 single crystal nanowires and nanorods with different aspect ratios were successfully prepared by adjusting the oxidant species, reactant ratio, reaction temperature, and other parameters in the hydrothermal reaction. Song Jiaxing [17] prepared a nanorod-like MnO 2 by hydrothermal synthesis, and prepared Al/MnO 2 thermite by ultrasonic mixing. The thermite prepared from rod MnO 2 has a higher exothermic rate and a lower onset temperature.…”

Section: Introductionmentioning

confidence: 99%

“…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%

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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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“…For example, Kim et al [12] investigated the thermite reactions between Al/CuO nanowires and nanopowders through field emission scanning electron microscopy (FE-SEM) and energy dispersive spectroscopy (EDS), which suggested that the heat flow and energy release were examined specifically as well. According to Song et al [15], the measurements on thermal properties and kinetics of Al/ α-MnO 2 thermite with nanostructure indicated high heat release and low onset temperature.…”

Section: Introductionmentioning

confidence: 99%

The Effect of CuO on the Thermal Behavior of the High-Energy Combustion Agent of the Al/MnO₂ System

Wang

Guo

Wen

et al. 2019

Advances in Materials Science and Engineering

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In this work, the effect of CuO addition into the high-energy combustion agent of Al/MnO 2 system was studied. First, the combustion experiments of five samples with different contents had been carried out, in which CuO was found capable of influencing the flame ejection to a great extent. en, in order to find out the underlying reasons, CuO effects on the thermal behavior of Al/MnO 2 system were analyzed via theoretical calculations of Gibbs free energy and enthalpy changes. In addition, field emission scanning electron microscopy (FE-SEM) that could characterize the mixture morphology and thermogravimetricdifferential scanning calorimetry (TG-DSC) that could indentify the exothermic and endothermic reactions and measure mass change were carried out. Finally, on the basis of all experimental findings, it was suggested that addition of CuO into Al/MnO 2 system could result in dramatic increase of gas content throughout the reaction and the consequent high pressure. Also, speed of flame injection and heat released in the high-temperature area would thus be conducive to the continuous exothermic behavior of the reaction.

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Thermal Properties and Kinetics of Al/α-MnO2 Nanostructure Thermite

Cited by 6 publications

References 22 publications

Thermal and Combustion Behaviors of Aluminum/ Manganese Dioxide/ Fluoroelastomer Terpolymer Nanothermite

Thermal and Combustion Behaviors of Aluminum/ Manganese Dioxide/ Fluoroelastomer Terpolymer Nanothermite

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

The Effect of CuO on the Thermal Behavior of the High-Energy Combustion Agent of the Al/MnO₂ System

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Thermal Properties and Kinetics of Al/α-MnO2 Nanostructure Thermite

Cited by 6 publications

References 22 publications

Thermal and Combustion Behaviors of Aluminum/ Manganese Dioxide/ Fluoroelastomer Terpolymer Nanothermite

Thermal and Combustion Behaviors of Aluminum/ Manganese Dioxide/ Fluoroelastomer Terpolymer Nanothermite

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

The Effect of CuO on the Thermal Behavior of the High-Energy Combustion Agent of the Al/MnO2 System

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

The Effect of CuO on the Thermal Behavior of the High-Energy Combustion Agent of the Al/MnO₂ System