Nanocomposite thermite powders prepared by cryomilling

Badiola, Carlo; Schoenitz, Mirko; Zhu, Xiaoying; Dreizin, Edward L.

doi:10.1016/j.jallcom.2009.08.146

Cited by 49 publications

(20 citation statements)

References 23 publications

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“…Indeed, it was shown [14,28] that in ARM powders evidence of exothermicity appeared at lower temperatures and the main exothermic peaks were "smeared" (their amplitude and slope were reduced) compared to non-activated powders. This smearing effect was found to be most pronounced when the DTA heating rate was slowest [29].…”

Section: Differential Thermal Analysis Resultsmentioning

confidence: 92%

On the Relationship between Shock and Thermal Initiating Conditions for Various Reactive Powder Mixtures

Jetté

Goroshin

Frost

et al. 2012

Propellants Explo Pyrotec

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The critical conditions for initiation of reaction by shock loading in various compositions that produce little or no gas upon reaction were investigated. Shock recovery experiments using Mn+S were first carried out in two different apparatus geometries and for two different initial sample densities. In one geometry, the sample was subjected to a planar shock followed by interactions with the confining walls. In the other geometry, a curved shock free of wall interactions was delivered to the sample. The low‐density (55 % TMD) Mn+S was found to be significantly more sensitive to the curved shock than to the planar shock with wall interactions. For high‐density (90 % TMD) Mn+S samples however, shock sensitivity was the same in both apparatuses. Next, the reaction onset temperature and the critical initiating shock pressure were determined for a number of powder mixtures using DTA and shock recovery (in the geometry producing planar shocks with interactions with the confinement walls), respectively. For the majority of the mixtures tested, the minimum shock energy required to cause the entire sample mixture to react was found to be much less than the enthalpy of the sample at its reaction onset temperature, with no significant correlation between these two parameters. The process of arrested ball‐milling, which results in a reduction of the reaction onset temperature of a mixture, may lead to an increase in shock sensitivity. Additionally, thermal sensitivity in the particular mixtures considered was not increased when they were first shock‐compacted by sub‐critical shocks.

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Section: Differential Thermal Analysis Resultsmentioning

confidence: 92%

On the Relationship between Shock and Thermal Initiating Conditions for Various Reactive Powder Mixtures

Jetté

Goroshin

Frost

et al. 2012

Propellants Explo Pyrotec

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show abstract

“…[26][27][28][29] The KAS isoconversional method can be expressed through the following equation: (4) where α is the degree of conversion, β the linear heating rate (°C min -1 ), T the absolute temperature (K), R the universal gas constant (J mol -1 K -1 ), A the pre-exponential factor (s -1 ) and E a is the activation energy (kJ mol -1 ). Assuming that the rate of reaction reaches maximum at the peak temperature, the plot of ln (β/T 2 ) vs. 1/T should be a straight line whose slope can be used to evaluate the activation energy E a .…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…Isoconversional methods can determine E a (activation energy) without the knowledge or assumption of kinetics model and can reveal the dependence of E a on conversion α. 26,27 The Kissinger-Akahira-Sunose (KAS) method is one of the most famous isoconversional methods on behalf of differential method to determine activation energy. 28,29 For the integration method, Vyazovkin advanced isoconversional method can be used to obtain the reliable activation energy.…”

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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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“…Some sample emission data from a cryomilled Al/CuO nanothermite [32], which was provided to us by Prof. Edward Dreizin of New Jersey Institute of Technology, are shown in Fig. 11.…”

Section: Figure 10mentioning

confidence: 99%

Shock compression dynamics under a microscope

Dlott

2017

AIP Conference Proceedings

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Abstract.Our laboratory has developed a tabletop laser miniflyer launcher used for a wide variety of studies in the physical and chemical sciences. The flyers, typically 0.7 mm in diameter, can be used to shock microgram quantities of interesting materials. Frequently 100 shock experiments per day are performed. A microscope objective transmits the photon Doppler velocimeter (PDV) flyer plate diagnostic and various laser beams, and collects signals from the shocked materials that can be transmitted to video cameras, spectrographs, streak cameras, etc. In this paper I describe the flyer plate apparatus and then discuss three recent efforts: (1) Shock dissipation in nanoporous media; (2) Probing micropressures in shocked microstructured media; and (3) Shock initiation of nanotechnology reactive materials.

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Nanocomposite thermite powders prepared by cryomilling

Cited by 49 publications

References 23 publications

On the Relationship between Shock and Thermal Initiating Conditions for Various Reactive Powder Mixtures

On the Relationship between Shock and Thermal Initiating Conditions for Various Reactive Powder Mixtures

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

Shock compression dynamics under a microscope

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