Study of the Environmental Humidity Influence on the Thermal Safety of the Pyrotechnic Compositions

Qifeng, Xing; Du, Zhiming; Zhao, Lingshuang; Yin, Qingguo

doi:10.1016/j.proeng.2012.08.202

Cited by 9 publications

(8 citation statements)

References 1 publication

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“…This outcome supports the above results of FTIR, Raman and XRD analyses, indicating that Ba(NO 2 ) 2 , BaO, MgO and Mg(OH) 2 are the main degradation products of PIC [14] . The formation of microcracks can influence the combustion performance and prompt the pyrotchnic composition ignition due to the increasing porosity of the solide simple caused by the aging conditions (temperature and moisture) [15] …”

Section: Resultssupporting

confidence: 87%

“…Xing et al. carried out their study on four different PCs at 35 °C and 93 % RH [15] . They reported that the onset temperature, the activation energy of the degradation as well as the thermal safety have been, resepctively, reduced.…”

Section: Introductionmentioning

confidence: 99%

“…They reported that the onset temperature, the activation energy of the degradation as well as the thermal safety have been, resepctively, reduced. Other substancial research activities dealing with the investigation of the thermal decomposition behavior of the CPs using DSC and TGA for which the data are employed to determine the kinetic parameters have been performed [3–4,5b,10,12a,b,13a,14–16] . Nonetheless, these works have mainly considered the assumption of a single‐step reaction process, which is neither accurate to represent the multistep reactions nor appropriate for samples containing different components that have different decomposition kinetics.…”

Section: Introductionmentioning

confidence: 99%

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Insight into the Effect of Moisture and Thermal Aging on the Degradation of a Pyrotechnic Igniter Composition through Thermogravimetric Kinetics Coupled with Deconvolution Approach

et al. 2021

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In the present study, the effect of moisture and thermal aging on the degradation of a pyrotechnic igniter composition (PIC) composed of magnesium (Mg) as fuel and dual‐oxidizer of barium nitrate (Ba(NO3)2) and barium peroxide (BaO2) has been investigated to well understand the main compositional and structural changes that may occur. The unaged and aged samples were examined through non‐destructive techniques, namely, Raman and Fourier transform infrared (FTIR) spectroscopies, scanning electron microscopy (SEM), and X‐ray diffraction (XRD). The thermal decomposition behavior and the kinetic parameters of the different Mg‐PIC samples were determined using thermogravimetry (TGA) analysis coupled with a deconvolution approach. The obtained results revealed that the aging processes performed at 65 °C and 85 % relative humidity (RH), respectively, affected the chemical structure of the samples, and the degradation became more pronounced with the increase of the aging time. These changes are attributed to the partial decomposition of barium nitrate, barium peroxide, and the oxidation of magnesium, which generated Ba(NO2)2, MgO, and Mg(OH)2 as degradation products. On the other hand, based on the TGA data, the kinetic modelling was carried out through the deconvolution approach combined with isoconversional kinetic analysis to determine the multiple‐step kinetic behaviors of the different PIC samples. The results revealed that the aging processes may engender various degradation reactions with different activation energies compared to the fresh sample, what can lead to severe changes in stability and untrustworthy performance of the pyrotechnic compositions.

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Section: Resultssupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Insight into the Effect of Moisture and Thermal Aging on the Degradation of a Pyrotechnic Igniter Composition through Thermogravimetric Kinetics Coupled with Deconvolution Approach

et al. 2021

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“…After 15 weeks of aging, the particle morphology changes from a smooth surface to a rigid one with sharp edges, displaying clearly distinguishable micro‐cracks. Unfortunately, the micro‐cracks formed, due to the aging conditions, increasing the porosity of the solid sample, which may certainly affect the combustion surface and thus promoting the sample ignition [25] …”

Section: Resultsmentioning

confidence: 99%

Towards understanding the effect of humidity on the degradation of pyrotechnic compositions through spectroscopic data combined with chemometric methods

Bekhouche

Abdelaziz

Chelouche

et al. 2021

Zeitschrift anorg allge chemie

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In the current study, two pyrotechnic compositions (tracer and igniter) containing magnesium and phenolic resin have been subjected to moisture‐induced aging at 85 % relative humidity to gain better understanding of environmental needs for their long‐storage. Non‐destructive analytical methods have been explored to investigate the effect of aging at a prolonged duration on pyrotechnics properties and their thermal behavior. The degradation of these pyrotechnic compositions during aging has been assessed using X‐ray diffraction, Fourier transform infrared (FTIR) and Raman spectroscopies, and scanning electron microscopy. It is revealed that some physical changes such as the appearance of micro‐cracks on the particle surfaces and chemical modifications such as the formation of magnesium hydroxide and nitrite‐based compounds occurred during aging. These changes affect the thermal stability of these pyrotechnic compositions as found by thermogravimetric analyses, which may increase the risk of a misfire. Moreover, the FTIR and Raman spectroscopic data were coupled with two different qualitative multivariate analysis techniques, i. e., hierarchical cluster analysis (HCA) and principal component analysis (PCA) for the classification and discrimination of the spectra of the aged specimens. The obtained results demonstrated the efficiency of the adopted methodologies to easily elucidate the structural and compositional modifications that may happen within the pyrotechnic compositions during moisture‐induced aging.

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“…[7].Aluminum nanopowders reactivity is influenced by atmospheric humidity [8]. The onset temperature of the gun powder chemical compositions are lower in different degree after humidification and the activation energy have reduced, as well as the thermal safety has been lower [9]. So the humidity is also one of the main factors should consider during handling, storage of the pyrotechnic chemical composition.…”

Section: Introductionmentioning

confidence: 99%

Water-induced thermal Decomposition of Fireworks Gunpowder Chemical Composition

2019

IJRTE

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In the firework industry, thermal decomposition is the main source of minor and fatal accidents. The existence of moisture and hygroscopic property of the fireworks chemical powders leads to thermal decomposition. In this study, firework chemicals combinations are modified by adding charcoal as one of the chemical powder. Here the gun powder is made using different chemical powders like potassium nitrate, sulfur, charcoal and it could be stored in shadow shed (stage-I) and followed by drying platform (stage-II). During this storage time, thermal analysis is carried out using Differential Scanning Calorimetric (DSC). DSC result of gun powder (after preparation) shows that thermal decomposition starts at 262.67°C and enthalpy is -521.57J/g. The gun powder from shadow shed it is 263.93°C and enthalpy is -378.21J/g. The onset temperature of the gun powder collected from the drying platform is 265.25°C and enthalpy is -284.01J/g. The sample after preparation contains more amount of moisture content absorbs more heat and initiates the thermal decomposition as earlier than the sample collected from shadow shed and drying platform. The heat dissipation rate is also reduced for stage I than stage II. So, the thermal hazards associated manufacturing process is very high when it contains more amount of moisture content

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Study of the Environmental Humidity Influence on the Thermal Safety of the Pyrotechnic Compositions

Cited by 9 publications

References 1 publication

Insight into the Effect of Moisture and Thermal Aging on the Degradation of a Pyrotechnic Igniter Composition through Thermogravimetric Kinetics Coupled with Deconvolution Approach

Insight into the Effect of Moisture and Thermal Aging on the Degradation of a Pyrotechnic Igniter Composition through Thermogravimetric Kinetics Coupled with Deconvolution Approach

Towards understanding the effect of humidity on the degradation of pyrotechnic compositions through spectroscopic data combined with chemometric methods

Water-induced thermal Decomposition of Fireworks Gunpowder Chemical Composition

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