Spark ignitable ball milled powders of Al and Ni at NiAl composition

Hadjiafxenti, A.; Gunduz, I. Emre; Doumanidis, Charalabos C.; Rebholz, Claus

doi:10.1016/j.vacuum.2013.09.006

Cited by 26 publications

(22 citation statements)

References 31 publications

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“…Near-true (~99%) density compacts formed by cold spray compaction were found to have~24 cm/s velocities [18]. Also using equiatomic Ni/Al, Hadjiafxenti et al [22] reported similarly high combustion velocities of 20e24 cm/s and 14 cm/s in lower density (68%) compacts using low energy ball milling (~87% t cr and~95% t cr , respectively). Depending on compact density, particle size, and pre-heat temperature, combustion velocities of typical non-milled Ni/Al pellets are on the order of 1e12 cm/s [28e30] for micron-sized powders.…”

Section: Introductionmentioning

confidence: 97%

“…These studies show MA significantly increases combustion velocities as compared to similar non-milled materials. However, for MA Ni/Al, studies demonstrating the effects of microstructure on combustion are limited [18,22]. A full study investigating how varying microstructure refinement via milling duration affects the combustion behavior of equiatomic MA Ni/Al has not been done.…”

Section: Introductionmentioning

confidence: 99%

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Combustion of mechanically activated Ni/Al reactive composites with microstructural refinement tailored using two-step milling

et al. 2015

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Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Combustion of mechanically activated Ni/Al reactive composites with microstructural refinement tailored using two-step milling

et al. 2015

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“…Exothermic formation reactions that generate intermetallic compounds and heat have been studied extensively [1][2][3][4][5][6][7][8] and can occur in compacts of homogeneous [1][2][3][4][5][6][7][8], composite [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] or core shell particles [29][30][31], or in layered films [32][33][34][35][36][37][38][39][40] or foils [41][42][43]…”

Section: Introductionmentioning

confidence: 99%

“…However, such processes are more expensive than mechanical methods due to high capital costs and lower throughput on a per mass basis. Mechanical methods for fabricating RMs include ball-milling [9,[11][12][13][14][15][16][17][18][19][21][22][23][24][25][26][27][28], rolling [10,[41][42][43][44][45], and cold isostatic pressing [3]. These methods typically have lower capital costs and higher throughputs but cannot achieve the same microstructural uniformity as PVD methods.…”

Section: Introductionmentioning

confidence: 99%

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Properties of reactive Al:Ni compacts fabricated by radial forging of elemental and alloy powders

Gibbins

Stover

Krywopusk

et al. 2015

Combustion and Flame

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a b s t r a c tWe explore rotary swaging of powders into solid compacts as an inexpensive means of producing reactive materials with refined microstructures and improved properties. Rotary swaging is a cold forging process that reduces the diameter of tubes, and in this study the tubes are packed with reactive combinations of elemental and alloy powders. The diameter reductions create a nearly fully dense compact from the powders and also reduce the average reactant spacing through plastic deformation. The extent of diameter reduction controls the microstructural refinement, observed through cross-sectional imaging. We correlate the observed changes in microstructure with reaction properties that are characterized using differential scanning calorimetry (DSC), hot-plate ignition studies, and velocity measurements. Exothermic peaks in DSC scans all shift to lower onset temperatures; hot plate ignition temperatures decrease; and reaction velocities rise as the degree of swaging is increased. We vary the shape of the initial reactants by substituting Ni flakes for Ni powders and find no improvement in microstructure or reaction properties, due to clumping of the Ni flakes during the initial compaction steps. We also vary chemistry by substituting Al-Mg alloy powders for Al powders and find that the alloy powders yield lower DSC exothermic peak temperatures, lower ignition temperatures, and higher reaction velocities compared to similar compacts with pure Al powders. This combination of results suggests that rotary swaging is an effective technique for producing reactive materials at low cost.

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Engineering of Al/CuO Reactive Multilayer Thin Films for Tunable Initiation and Actuation

Rossi

2018

Propellants Explo Pyrotec

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Sputter‐deposited Al/CuO multilayers represent the state‐of‐the‐art of energetic nanomaterials for tunable ignition and actuation because their theoretical energy densities are significantly higher than most conventional secondary explosives while being less sensitive to undesired initiation. Both the sensitivity and combustion properties (temperature, combustion velocity and products of reaction) can be manipulated via the layering, reactant spacing and stoichiometry of the multilayer and, to a lesser extent, via interface engineering. In this article, we first describe the technology of deposition of Al/CuO multilayers focusing on direct current sputter deposition followed by a comprehensive review of the materials structural characteristics. Next, experimental and theoretical works performed on these reactive multilayered materials to date is presented in terms of methods used, the results acquired on ignition and combustion properties, and conclusions drawn. Emphasis is placed on several studies elucidating the fundamental processes that underlie propagating combustion reactions. This paper provides a good support for engineers to safely propose Al/CuO multilayers structure to regulate the energy release rates and ignition threshold in order to manufacture high performance and tunable initiator devices.

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Spark ignitable ball milled powders of Al and Ni at NiAl composition

Cited by 26 publications

References 31 publications

Combustion of mechanically activated Ni/Al reactive composites with microstructural refinement tailored using two-step milling

Combustion of mechanically activated Ni/Al reactive composites with microstructural refinement tailored using two-step milling

Properties of reactive Al:Ni compacts fabricated by radial forging of elemental and alloy powders

Engineering of Al/CuO Reactive Multilayer Thin Films for Tunable Initiation and Actuation

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