Development of pyrotechnic delay mixtures based on a composite material hardened with carbon nanotubes

Gabdrashova, S. E.; Tulepov, M. I.; Korchagin, Michail A.; Sassykova, L.R.; Abdrakova, F. Yu.; Bexultan, Zh. B.; Aitenov, Y. K.; Toktagul, S. E.; Baiseitov, D. A.

doi:10.15251/djnb.2021.164.1341

Cited by 3 publications

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“…The need to ensure a time delay in the operation of pyrotechnic products arose with the appearance of black powder and the first fuzes, bombs, hand grenades and rockets. The delay is necessary for an explosive ordnance to move to a safe distance, and to detonate the charge at the right moment [1]. Pyrotechnic delay compositions can be considered gasless or gas-producing depending on the quantity of gas generated during the combustion.…”

Section: Introductionmentioning

confidence: 99%

Research on gas producing time delay pyrotechnic compositions based on black powder and phenol-formaldehyde resin

Mojsilović,

Petković-Cvetković,

Nešić

et al. 2023

Sci Tech Rev

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In the past few years, we have witnessed that due to the pandemic and wars, some countries have limited their export of various ingredients. The request has been made to create a time delay pyrotechnic composition with easily accessible ingredients. For that purpose, black powder with addition of phenol formaldehyde resin was a possible solution. This study aims to show an optimization of the ratio in the fuel-oxidant mixture and how this ratio influences the properties of pyrotechnic compositions. The stoichiometric ratios were determined by using the oxygen balance (OB) and pyro valence (PV) values. The linear burning rate was measured using a VOD 811 measuring system for some typical compositions which were pressed into alluminium tubes. The calorimetric bomb was used in the experiments with an inert gas supply to determinate the heat of reaction and the closed-vessel test was used to measure the production of gaseous products. The theoretical maximum density was calculated using ingredients' density measured with gas pycnometer ULTRAPYC 5000 with an inert gas supply nitrogen or helium. After these tests, it was concluded that pyrotechnic composition with more than 25 wt.% of charcoal does not satisfy requirements for a gas producing pyrotechnic composition. The minimal requirements can be satisfied with pyrotechnic compositions that consist of 75-80 wt.% of potassium

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Section: Introductionmentioning

confidence: 99%

Research on gas producing time delay pyrotechnic compositions based on black powder and phenol-formaldehyde resin

Mojsilović,

Petković-Cvetković,

Nešić

et al. 2023

Sci Tech Rev

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“…In order to achieve the required combustion velocity for the Si/Pb 3 O 4 PDC, the dimensions of the grains of its components need to be on the order of micro-or even nanometers [9,10]. Such fine particles are readily suspended in air, particularly when being transported or poured into mixing units.…”

Section: Introductionmentioning

confidence: 99%

Study of the Combustion Mechanism of Zn/KMnO4 Pyrotechnic Composition

Polis,

Szydło,

Zakusylo

et al. 2023

Molecules

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This work aims to investigate the combustion mechanism for a pyrotechnic delay composition (PDC), consisting of zinc powder as a fuel and KMnO4 as an oxidising agent. For this purpose, the compositions were thermally conditioned at several set temperatures, chosen based on our previous work. Tests were also performed for post-combustion residues obtained via combustion of the PDCs in a manometric bomb. The samples were examined by scanning electron microscopy (SEM), Raman spectroscopy and X-ray diffractometry (XRD). Furthermore, the obtained results were correlated with previous studies by the authors and compared with data available in the literature. On the basis of tests carried out for thermally conditioned samples, a combustion mechanism was determined for Zn/KMnO4 as a function of temperature. The results show that the combustion process dynamics are independent of equilibrium ratio and limited mainly by diffusion of liquid fuel into the solid oxidising agent. Moreover, it has been revealed that Raman spectroscopy can be effectively used to determine combustion mechanisms for pyrotechnic compositions.

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Investigation of Combustion of KMnO4/Zn Pyrotechnic Delay Composition

et al. 2022

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This article reports an investigation of the combustion of a binary pyrotechnic delay composition (PDC), consisting of zinc powder as fuel and KMnO4 as an oxidising agent, with zinc content ranging from 35 to 70 wt. %. The linear burning rate for delay compositions in the form of pyrotechnic fuses was investigated. Compositions with zinc content between 50 and 70 wt. % yielded burn rates in the range of 13.30–28.05 mm/s. The delay compositions were also tested for their sensitivity to friction and impact, where the compositions showed impact sensitivity in the range from 7.5 to 50 J and were insensitive to friction. Tests in a pressure bomb were carried out to determine the maximum overpressure and pressurisation rate. The thermal properties of the composition were evaluated by thermogravimetric analysis (DTA/TG). The morphology of the combustion products was studied by SEM technique, EDS analyses were used to investigate the element distribution of the post-combustion residues, providing an insight into the phenomena taking place during the combustion of the delay compositions.

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Development of pyrotechnic delay mixtures based on a composite material hardened with carbon nanotubes

Cited by 3 publications

References 0 publications

Research on gas producing time delay pyrotechnic compositions based on black powder and phenol-formaldehyde resin

Research on gas producing time delay pyrotechnic compositions based on black powder and phenol-formaldehyde resin

Study of the Combustion Mechanism of Zn/KMnO4 Pyrotechnic Composition

Investigation of Combustion of KMnO4/Zn Pyrotechnic Delay Composition

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