Effect of dilution on reaction properties and bonds formed using mechanically processed dilute thermite foils

Kinsey, Alex H.; Slusarski, Kyle; Woll, K.; Gibbins, David J.; Weihs, Timothy P.

doi:10.1007/s10853-016-9876-9

Cited by 25 publications

(17 citation statements)

References 36 publications

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“…It is worth noting that multilayer nanothermite system Al/CuO was applied earlier for creating the microchip initiators . In addition to magnetron sputtering, mechanical processing of the thermite‐type RMNFs are developing, including Al–Cu 2 O–Cu or Al–NiO, Al–CuO, and Al–Cu 2 O systems . Some new mechanical approaches, like radial forges, have been applied to the Ni–Al system in order to produce dense reactive materials .…”

Section: Experimental Study Of the Shs Process In Ni/al Rmnfsmentioning

confidence: 99%

SHS in Ni/Al Nanofoils: A Review of Experiments and Molecular Dynamics Simulations

et al. 2018

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Non-isothermal processes in nanometric metallic multilayers are reviewed, both experimentally and theoretically. The Ni/Al nanofoil is considered as a model system. On the one hand, the experimental methods of elaboration and analysis are presented and, on the other hand, the modeling approach at the macroscopic and atomic scale. The basic experimental features are reported together with recent achievements. Molecular dynamics investigation of the reactivity of Ni/Al systems is reported for bulk systems and nanosystems including nanoparticles, nanowires, nanofilms, and multilayers. The focus is on atomic-scale modeling versus experiments. Molecular dynamics approaches allow us to elucidate the mechanisms of nonisothermal processes occurring in nanoscale systems, such as phase transformations and self-propagation reactions.

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Section: Experimental Study Of the Shs Process In Ni/al Rmnfsmentioning

confidence: 99%

SHS in Ni/Al Nanofoils: A Review of Experiments and Molecular Dynamics Simulations

et al. 2018

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“…Due to their highly exothermic nature, thermite reactions can also generate substantial amount of gas (metal and oxide molecules [1][2][3] 3 ) and multilayered into two dimensional structures [9][10][11][12] . These multilayered structures are produced mostly by sputter-deposition of aluminum and metal oxide layers (mostly CuO) and constitute a promising alternative to nanopowders for on-chip integration.…”

Section: Introductionmentioning

confidence: 99%

“…They are amenable to lithographic patterning and integration with other microelectronic fabrication processes. Al/CuO multilayers, in specific structure and chemical conditions, can exhibit tunable fast high temperature reaction zones making them good candidates as heat sources for many application areas including micro-actuators 13 , brazing 12 as well as those normally associated with conventional energetic substances as rapid fuses and micro-initiators 14,15 . Whatever applications, harvesting the heat of multilayered thermite reactions entails the film ignition in an efficient and reliable manner.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Al/CuO multilayered thermite ignition

Nicollet¹,

Lahiner²,

Belisario³

et al. 2017

Journal of Applied Physics

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The ignition of Al/CuO multilayered material is studied experimentally to explore the effect of heating surface area, layering and film thickness on the ignition characteristics and reaction performances. After the description of the micro-initiator devices and ignition conditions, we show that the heating surface area has to be properly calibrated to optimize the nanothermite ignition performances. We demonstrated experimentally that a heating surface area of 0.25 mm 2 is sufficient to ignite a multilayered thermite film of 1.6 mm wide by a few cm long, with a success rate of 100%. A new analytical and phenomenological ignition model based on atomic diffusion across layers and thermal exchange is also proposed. This model considers that CuO first decomposes into Cu 2 O, the oxygen diffusing across Cu 2 O and Al 2 O 3 layers before reaching the Al layer where it reacts to form Al 2 O 3 . The theoretical results in terms of ignition response times confirm the experimental observation. The increase of the heating surface area leads to an increase of the ignition response time and ignition power threshold (go/no go condition). We also evidence that for any heating surface area, the ignition time rapidly decreases when the electrical power density increases until an asymptotic value, named minimum response ignition time, which is a characteristic of the multilayered thermite itself. At the stoichiometric ratio (Al thickness is half of CuO one), the minimum ignition response time can be easily tuned from 59 µs to 418 ms by tuning the heating surface area. The minimum ignition response time increases when the bilayer thickness increases. Not only this work gives a set of micro-initiator design rules to obtain the best ignition conditions and reaction performances but it also details a reliable and robust MEMS process to fabricate igniters and it brings new understanding of phenomena governing the ignition process of Al/CuO multilayers.

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“…Both KMnO 4 and HCl were supplied by Lingfeng chemical reagent Co., LTD. (Shanghai, China). In addition, the nano-Al fuel with 100 nm average diameter was purchased from Aladdin Industrial Corporation (Shanghai, China).…”

Section: Methodsmentioning

confidence: 99%

“…Thermite reaction is considered to generate molten metal and release plentiful heat from exothermic thermite mixture or composites. [1][2][3] As a type of oxidation-reduction reaction, molten metal can be produced when the fuel reduces the metallic oxide: 4 A + MO = AO + M + DH…”

Section: Introductionmentioning

confidence: 99%

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

Song

Fang

Guo

et al. 2017

J. Braz. Chem. Soc.

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In this work, thermal properties and kinetics of Al-nanoparticles/α-MnO 2 nanorods thermite were reported. The α-MnO 2 nanorods were synthesized using a hydrothermal method and were characterized by X-ray powder diffraction (XRD) and X-ray photoelectron spectra (XPS), then combined with Al nanoparticles based on the ultrasonic mixing method to prepare the nanostructure thermite. Besides, both pure components and mixture were characterized by field emission scanning electron microscopy (FE-SEM) to observe their morphologies and structures. Subsequently, the thermal properties of Al/α-MnO 2 nanostructure thermite were studied on the basis of thermogravimetric-differential scanning calorimetry (TG-DSC). According to the TG-DSC tests, the calculation results of activation energy for kinetics of Al/α-MnO 2 thermite were obtained using different isoconversional methods. It was found that Al/α-MnO 2 nanostructure thermite has high heat release and low onset temperature, and the heat release of the nanostructure thermite was approximately 1146.6 J g -1 .

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Effect of dilution on reaction properties and bonds formed using mechanically processed dilute thermite foils

Cited by 25 publications

References 36 publications

SHS in Ni/Al Nanofoils: A Review of Experiments and Molecular Dynamics Simulations

SHS in Ni/Al Nanofoils: A Review of Experiments and Molecular Dynamics Simulations

Investigation of Al/CuO multilayered thermite ignition

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

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