2022
DOI: 10.3390/mi13030451
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Observations on Detonation Growth of Lead Azide at Microscale

Abstract: Lead azide (LA) is a commonly used primary explosive, the detonation growth of which is difficult to study because it is so sensitive and usually has a small charge size in applications. We used photon Doppler velocimetry (PDV) and calibrated polyvinylidene fluoride (PVDF) gauges to reveal the detonation growth in LA, which was pressed in the confinements with controlled heights. The particle-velocity profiles, output pressure, unsteady detonation velocity, reaction time, and reaction-zone width were obtained … Show more

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Cited by 6 publications
(6 citation statements)
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“…The influencing factors of lead azide are the diameter, height, density, and constraint conditions of the charge. In the MEMS detonation system, the diameter of the primary explosive is at the level of 1 mm [ 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 ], so the simulation range of the diameter should be about 1 mm; in [ 17 , 18 ], the output performance of lead azide with a charge height of 0.6 mm~3 mm was verified, so the charge height in the simulation was also set in this range. The common density of lead azide is more than 3 g·cm −3 , and the crystal density is slightly larger than 4 g·cm −3 , so the density range in the simulation was set to 2 g·cm −3 ~4 g·cm −3 .…”
Section: Methodsmentioning
confidence: 99%
See 2 more Smart Citations
“…The influencing factors of lead azide are the diameter, height, density, and constraint conditions of the charge. In the MEMS detonation system, the diameter of the primary explosive is at the level of 1 mm [ 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 ], so the simulation range of the diameter should be about 1 mm; in [ 17 , 18 ], the output performance of lead azide with a charge height of 0.6 mm~3 mm was verified, so the charge height in the simulation was also set in this range. The common density of lead azide is more than 3 g·cm −3 , and the crystal density is slightly larger than 4 g·cm −3 , so the density range in the simulation was set to 2 g·cm −3 ~4 g·cm −3 .…”
Section: Methodsmentioning
confidence: 99%
“…In Section 2.3.1 , it was introduced that the diameter of the lead azide was at the 1 mm level, so the diameter of the lead azide in this experiment was submillimeter (0.9 mm); when the pressing pressure was 188 MPa, the corresponding theoretical density of 3.83 g·cm −3 was used as the charge density of the lead azide [ 19 ], which was also close to that used in the literature [ 17 , 18 ]. According to the preliminary simulation results, the flyer had a relatively high speed when the charge height was 1.2 mm, the thickness of the titanium flyer was 0.1 mm, and the aperture of the stainless steel acceleration chamber was 0.6 mm.…”
Section: Methodsmentioning
confidence: 99%
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“…Among them, microcharge is the energy source of MEMS pyrotechnics. The performance of microcharge directly determines the performance of MEMS pyrotechnics [2][3][7][8]. The characteristic size of microcharge of MEMS pyrotechnics is generally tens of microns to 1mm, which is lower than the critical size of stable fire transmission and explosion transmission of conventional fireworks, and typical non-ideal characteristics are presented in micro-size detonation [9].…”
Section: Introductionmentioning
confidence: 99%
“…The study of charging method shows that the precision pressing technology is only suitable for charging above millimeter scale. Although in-situ self-assembly, vacuum charging and other forming technologies can obtain sub-millimeter size charge, the molding density is low (65% TMD) and the explosion capacity is poor [7][8][9]. Common charging processes are no longer suitable for MEMS pyrotechnic charging.…”
Section: Introductionmentioning
confidence: 99%