Study of gasless compositions used in time-delay elements

Gerlich, Marcin; Wojewódka, A.

doi:10.1007/s10973-019-08721-8

Cited by 6 publications

(3 citation statements)

References 16 publications

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“…Fe 2 O 3 and Fe 2 O 3 /graphene oxide have been used as burn rate catalysts in energetic materials. M. Gerlich et al [15] presented the findings of burn rate tests performed on a Fe/BaO 2 pyrotechnic delay composition. The catalytic performance of Fe 2 O 3 in the thermal degradation of ammonium perchlorate was studied by Li X. et al [16] Catalytic effect of n-Fe 2 O 3 & rGO-Fe 2 O 3 was observed on the thermal decomposition of CL-20/HMX cocrystal by Wu et al [17] Danali et al [18] discussed in his review about use of Fe 2 O 3 nanoparticles in delay/priming composition and in green pyrotechnics.…”

Section: Introductionmentioning

confidence: 99%

Hematite Particle Size Effect on Combustion Performance of Fire Extinguishing Composites

et al. 2023

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Hematite nanoparticles (α-Fe 2 O 3 ) were successfully synthesised using facile and eco-friendly hydrothermal method. Synthesised hematite nanoparticles were characterized using X-ray diffraction, Fourier transform infrared spectroscopy, surface area analysis and transmission electron microscopy. Nano/ micro particles of Hematite (1, 3&5 %, w/w) were incorporated in aerosol forming composite (AFC). For the first time, catalytic effect of nano and micro size hematite on performance of AFC has been creatively investigated with respect to combustion and fire extinguishment parameters. Incorporation of nano hematite (5 %, w/w) in AFC reduced the combustion temperature (by 11 %) and tremendously boosted the burn rate & combustion efficiency by 30&7.5 % respectively. This in turn produced the aerosols in less time and put out the fire quickly (< 5 s). Hematite nano counterpart was discovered to be more promising than its micro equivalent. This exploratory study is valuable in the field of development of futuristic ultra-fast fire extinguishants.

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Section: Introductionmentioning

confidence: 99%

Hematite Particle Size Effect on Combustion Performance of Fire Extinguishing Composites

et al. 2023

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“…Of course, due to the use of organic binders or a system of several oxidants, at least one of which can decompose at a temperature lower than the reaction temperature in the solid state, the term is also used for mixtures generating less than 10 mL of gaseous products per 1 g of mixture [ 7 ]. Several pyrotechnic mixtures have been proposed in recent years that meet these conditions (e.g., Ti/C-3Ni/Al [ 8 ], Fe/BaO 2 [ 9 ], Sb/KMnO 4 [ 10 ]). Unfortunately, the high ignition temperature and high heat losses due to the dissipation of energy through the walls of the time delay element make many gasless mixtures impractical due to the possibility of stopping the combustion wave.…”

Section: Introductionmentioning

confidence: 99%

Tungsten and Copper (II) Oxide Mixtures as Gasless Time Delay Compositions for Mining Detonators

2023

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The widespread use of pyrotechnic compositions in time delay detonators is the reason for research aimed at expanding knowledge of the combustion properties of new pyrotechnic mixtures, whose components react with each other in the solid or liquid state. Such a method of combustion would make the rate of combustion independent of the pressure inside the detonator. This paper presents the effect of the parameters of W/CuO mixtures on their properties of combustion. As this composition has not been the subject of previous research and is not described in the literature, the basic parameters, such as the burning rate and the heat of combustion, were determined. In order to determine the reaction mechanism, a thermal analysis was performed, and the combustion products were determined using the XRD technique. Depending on the quantitative composition and density of the mixture, the burning rates were between 4.1–6.0 mm/s and the heat of combustion in the range of 475–835 J/g was measured. The gas-free combustion mode of the chosen mixture was proved using DTA and XRD. Determination of the qualitative composition of the combustion products and the heat of combustion allowed estimation of the adiabatic combustion temperature.

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“…Delay compositions systems as fuses and electro explosive devices are a safe starting trigger for different applications as rocket launching systems and space industry [1,2]. Different types (gassy and gasless) delay compositions are mainly used to transfer the ignition from one stage to another at preordained time [3]. Simplicity in structure and low production cost makes delay compositions widely used in different military and civilian products [4].…”

Section: Introductionmentioning

confidence: 99%

Novel Evaluation for The Effect of binder percentage on Tungsten-Based Delay Compositions

hawass¹,

ELWANY

Elmarsfy

et al. 2023

Egypt. J. Chem.

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Tungsten delay systems widely used in mining and blasting operations which encourage the scientific research about improving the performance and reliability of these compositions. Binders' types and its percentage have a great effect in the performance of delay compositions. For this purpose, new research applied to different delay compositions which based on tungsten, BaCrO4, KClO4 and polyvinyl acetate (PVA) according to different percentage of (PVA). The PVA weight percentage varied from 5% to 15%. The compositions are fabricated by mixing, granulated and finally loaded in aluminium tube. Novel methods have been applied to predict the performance of delay element by ICT code. Which the resulted heat of formation and density have been illustrated. Ignition static test for delay element using central testing unit (CTU) by Schaffler company showed enhancement in burning rate by 7% to 37%. Characterization of the prepared compositions is carried out through sensitivity tests (impact, friction, ignition, electrostatic discharge (ESD) and thermal analysis test using DSC and TAM apparatus. All the obtained results from tested delay compositions ensure safety behaviour during handling, fabrication, transportation and storage.

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Study of gasless compositions used in time-delay elements

Cited by 6 publications

References 16 publications

Hematite Particle Size Effect on Combustion Performance of Fire Extinguishing Composites

Hematite Particle Size Effect on Combustion Performance of Fire Extinguishing Composites

Tungsten and Copper (II) Oxide Mixtures as Gasless Time Delay Compositions for Mining Detonators

Novel Evaluation for The Effect of binder percentage on Tungsten-Based Delay Compositions

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