Combustion of heterogeneous nanostructural systems (Review)

Рогачев, А. С.; Mukasyan, Alexander S.

doi:10.1007/s10573-010-0036-2

Cited by 138 publications

(67 citation statements)

References 116 publications

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“…High energy density materials (HEDM) are a class of energetic materials that react when exposed to extreme conditions such as high temperature, electric shock, or physical impact, releasing a lot of chemical energy as heat [1][2][3]. Due to these reactive properties, HEDMs are widely used in the fields where an enormous amount of energy needs to be emitted in a short period of time.…”

Section: Introductionmentioning

confidence: 99%

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Exothermic Reaction Kinetics in High Energy Density Al-Ni with Nanoscale Multilayers Synthesized by Cryomilling

Han

et al. 2018

Metals

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Abstract:The Al-Ni system is known as a high energy density materials (HEDM) because of its highly exothermic nature during intermetallic compound (IMC) formation. In this study, elemental Al and Ni powder were milled to explore the effect of cryomilling atmosphere on the microstructure and exothermic behavior. Scanning electron microscope (SEM) observations show continuous structural refinement up to 8 h of cryomilling. No IMC phase was detected in the X-ray diffraction (XRD) spectrum. Differential thermal analyzer (DTA) results show two exothermic peaks for 8 h cryomilled powder as compared to that of powder milled for 1 h. The ignition temperature of prepared powder mixture also decreased due to gradual structural refinement. The activation energy was also calculated and correlated with the DTA and SEM results. The cryomilled Al-Ni powder is composed of fine Al-Ni metastable junctions which improve the reactivity at a lower exothermic reaction temperature.

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Section: Introductionmentioning

confidence: 99%

“…The metal + metal bonded HEDMs are also referred to as solid flame materials or gasless exothermic materials. The most popular reactive material system is Al-Ni [1][2][3][4][5]. In the Al-Ni system, when intermetallic compounds (IMC) are formed, a large amount of heat reaching 59.53 kJ/mol can be generated.…”

Section: Introductionmentioning

confidence: 99%

Exothermic Reaction Kinetics in High Energy Density Al-Ni with Nanoscale Multilayers Synthesized by Cryomilling

Han

et al. 2018

Metals

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“…At the same time, the absence of gas products during the reaction makes such materials excellent candidates for a variety of applications including synthesis of nanomaterials, reactive bonding of refractory and dissimilar parts, gasless micro power generators, etc. [11][12][13][14][15][16][17] . However, the relatively high ignition temperature of those systems (900-3,000 K, see Table 1) compared to thermites (~1,000 K) hinders their applications.…”

Section: Introductionmentioning

confidence: 99%

“…However, the relatively high ignition temperature of those systems (900-3,000 K, see Table 1) compared to thermites (~1,000 K) hinders their applications. The preparation of engineered nanostructured composites could significantly enhance the ignition and combustion characteristics of gasless heterogeneous systems [12][13][14]17 .…”

Section: Introductionmentioning

confidence: 99%

“…Many methods have been developed to fabricate the engineered energetic nanocomposites, such as ultrasonic mixing 18,19 , self-assembly approaches 5 , sol-gel [20][21][22] , vapor deposition techniques 16,17,23,24 , as well as high-energy ball milling (HEBM) 1,5 . The disadvantage of ultrasonic mixing of nano-powder is that a thick (5-10 nm) oxide shell on metal nanoparticles reduces energy density and degrades the combustion performance of reactive mixtures.…”

Section: Introductionmentioning

confidence: 99%

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Preparation and Reactivity of Gasless Nanostructured Energetic Materials

Manukyan

Shuck

Рогачев

et al. 2015

JoVE

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High-Energy Ball Milling (HEBM) is a ball milling process where a powder mixture placed in the ball mill is subjected to high-energy collisions from the balls. Among other applications, it is a versatile technique that allows for effective preparation of gasless reactive nanostructured materials with high energy density per volume (Ni+Al, Ta+C, Ti+C). The structural transformations of reactive media, which take place during HEBM, define the reaction mechanism in the produced energetic composites. Varying the processing conditions permits fine tuning of the milling-induced microstructures of the fabricated composite particles. In turn, the reactivity, i.e., self-ignition temperature, ignition delay time, as well as reaction kinetics, of high energy density materials depends on its microstructure. Analysis of the milling-induced microstructures suggests that the formation of fresh oxygen-free intimate high surface area contacts between the reagents is responsible for the enhancement of their reactivity. This manifests itself in a reduction of ignition temperature and delay time, an increased rate of chemical reaction, and an overall decrease of the effective activation energy of the reaction. The protocol provides a detailed description for the preparation of reactive nanocomposites with tailored microstructure using short-term HEBM method. It also describes a high-speed thermal imaging technique to determine the ignition/combustion characteristics of the energetic materials. The protocol can be adapted to preparation and characterization of a variety of nanostructured energetic composites. Video LinkThe video component of this article can be found at

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2015

Al‐Based Energetic Nanomaterials

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Combustion of heterogeneous nanostructural systems (Review)

Cited by 138 publications

References 116 publications

Exothermic Reaction Kinetics in High Energy Density Al-Ni with Nanoscale Multilayers Synthesized by Cryomilling

Exothermic Reaction Kinetics in High Energy Density Al-Ni with Nanoscale Multilayers Synthesized by Cryomilling

Preparation and Reactivity of Gasless Nanostructured Energetic Materials

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