Impact ignition of nano and micron composite energetic materials

Hunt, Emily M.; Malcolm, Steven; Pantoya, Michelle L.; Davis, F.J.

doi:10.1016/j.ijimpeng.2008.11.011

Cited by 101 publications

(55 citation statements)

References 17 publications

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“…Particles were mixed by sonication in the same method as described in [9]. The nanometer aluminum particles (nmAl) were obtained by NovaCentrix with an average particle diameter of 50 nm passivated with an average alumina shell thickness of 2 nm and are spherical in shape.…”

Section: Sample Preparationmentioning

confidence: 99%

“…Details on the mixing process can be found in [9] but are summarized here. The powder mixture was suspend in hexane and mixed using sonic waves.…”

Section: Sample Preparationmentioning

confidence: 99%

“…Once an optimal range is found in which there are positive and negative reactions, tests are conducted on 1 cm intervals. Using an abbreviated Bruceton method [9], the lowest drop height that produces a greater than 50% reaction is used to calculate ignition energy using a standard equation for potential energy Eq. (1).…”

Section: Impact Ignition Apparatusmentioning

confidence: 99%

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Impact sensitivity of intermetallic nanocomposites: A study on compositional and bulk density

Hunt¹,

Pantoya²

2010

Intermetallics

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Section: Sample Preparationmentioning

confidence: 99%

“…Details on the mixing process can be found in [9] but are summarized here. The powder mixture was suspend in hexane and mixed using sonic waves.…”

Section: Sample Preparationmentioning

confidence: 99%

See 1 more Smart Citation

Impact sensitivity of intermetallic nanocomposites: A study on compositional and bulk density

Hunt¹,

Pantoya²

2010

Intermetallics

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“…Polytetrafluoroethylene filled by aluminum particles (Al-PTFE) is one of the most promising RMs and has been studied extensively, owing to its easiness to deform and higher strength, stability, and energy density compared with traditional explosive [1][2][3]. When Al-PTFE is subjected to sufficiently strong mechanical stimulus, violent chemical reaction will occur with new substance produced and large amount of heat released.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Mechanical Properties and Reaction Characteristics of Al‐PTFE Composites with Different Al Particle Size

Fang

Gao

et al. 2018

Advances in Materials Science and Engineering

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Al-PTFE (aluminum-polytetrafluoroethylene) serves as one among the most promising reactive materials (RMs). In this work, six types of Al-PTFE composites with different Al particle sizes (i.e., 50 nm, 1∼2 μm, 6∼7 μm, 12∼14 μm, 22∼24 μm, and 32∼34 μm) were prepared, and quasistatic compression and drop weight tests were conducted to characterize the mechanical properties and reaction characteristics of Al-PTFE composites. e reaction phenomenon and stress-strain curves were recorded by a high-speed camera and universal testing machine. e microstructure of selected specimens was anatomized through adopting a scanning electron microscope (SEM) to correlate the mesoscale structural characteristics to their macroproperties. As the results indicated, in the case of quasistatic compression, the strength of the composites was decreased (the yield strength falling from 22.7 MPa to 13.6 MPa and the hardening modulus declining from 33.3 MPa to 25 MPa) with the increase of the Al particle size. e toughness rose firstly and subsequently decreased and peaked as 116.42 MJ/m 3 at 6∼7 μm. e reaction phenomenon occurred only in composites with the Al particle size less than 10 μm. In drop weight tests, six types of specimens were overall reacted. As the Al particle size rose, the ignition energy of the composites enhanced and the composites turned out to be more insensitive to reaction. In a lower strain rate range (10), Al-PTFE specimens take on different mechanical properties and reaction characteristics in the case of different strain rates. e formation of circumferential open cracks is deemed as a prerequisite for Al-PTFE specimens to go through a reaction.

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“…Although a considerable number of experiments have been focused on the influence of intrinsic properties and/or extrinsic properties of constituents on the impact initiation behavior of RMs [12,13,[21][22][23], the pressing and sintering processes have not received as much research attention. However, once the constituents of an RM mixture are chosen, pressing and sintering become major factors that influence the sample strength which in turn controls the plastic deformation and breaking up processes, both of which have a major effect on the impact initiation and reaction behavior.…”

mentioning

confidence: 99%

Influence of Processing Techniques on Mechanical Properties and Impact Initiation of Al-PTFE Reactive Material

Bin¹,

Fang²,

Li³

et al. 2016

Cent. Eur. J. Energ. Mater.

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Reactive materials (RMs) or impact-initiated materials have received much attention as a class of energetic materials in recent years. To assess the influence of processing techniques on mechanical properties and impact initiation behaviors of an Al-PTFE reactive material, quasi -static compression tests and drop-weight tests were performed. Scanning electron microscopy (SEM) was used to identify the characteristics of the interior microstructures of the Al-PTFE samples. A sintering process was found to transform Al-PTFE from a brittle to a ductile material with an increased elasticity modulus (from 108-160 MPa to 256-336 MPa) and yield stress (from 12-16 MPa to 19-20 MPa). Increasing the molding pressure from 36 MPa to 182 MPa increased the elastic modulus of all Al-PTFE samples and also the yield stress of unsintered ones. Unsintered samples in general required less energy to initiate than sintered ones. As the molding pressure increased, the impact initiation energy for sintered Al-PTFE fell from 96 J to 68 J, whereas the initiation energy for unsintered Al-PTFE rose from 68 J to 85 J. PTFE nanofiber networks observed in sintered samples formed under the higher molding pressures could contribute to the opposite trends observed in the impact initiation energy of unsintered and sintered Al-PTFE samples.

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Impact ignition of nano and micron composite energetic materials

Cited by 101 publications

References 17 publications

Impact sensitivity of intermetallic nanocomposites: A study on compositional and bulk density

Impact sensitivity of intermetallic nanocomposites: A study on compositional and bulk density

Investigation on Mechanical Properties and Reaction Characteristics of Al‐PTFE Composites with Different Al Particle Size

Influence of Processing Techniques on Mechanical Properties and Impact Initiation of Al-PTFE Reactive Material

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