An investigation on the dust explosion of micron and nano scale aluminium particles

Chang, Po-Jul; Mogi, Tatsushi; Dobashi, Ritsu

doi:10.1016/j.jlp.2021.104437

Cited by 22 publications

(4 citation statements)

References 18 publications

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“…It is worthy to note that some researchers found that the main explosive particle size and the aluminium particle size have significant effects on the thermal stability, critical temperature, explosion heat, and energy output of the explosion, among other parameters [ 46 , 47 , 48 , 49 , 50 ]. The smaller the particle size of the main explosive and aluminium powder, the lower the activation energy of the explosive mixture.…”

Section: Resultsmentioning

confidence: 99%

“…The smaller the particle size of the main explosive and aluminium powder, the lower the activation energy of the explosive mixture. In comparison, an explosive mixed with aluminium powder of a larger particle size is more thermally stable [ 46 ]. However, in a study carried out by Yao Lina [ 48 ], it was found that DNTF (3,4-Bis (3-nitrofurazan-4-yl) furoxan) pressed explosive mixture containing 5% aluminium nanoparticles and 25% aluminium microparticles performs better in thermal stability than DNTF explosive mixture containing 30% aluminium microparticles.…”

Section: Resultsmentioning

confidence: 99%

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Thermal Hazard Analysis of Two Non-Ideal Explosives Based on Ammonium Perchlorate/Ammonium Nitrate and Aluminium Powder

Guo,

Chen,

et al. 2024

Molecules

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In recent years, various kinds of civil explosive detonation accidents have occurred frequently around the world, resulting in substantial human casualties and significant property losses. It is generally believed that thermal stimulation plays a critical role in triggering the detonation of explosives; consequently, the study of the thermal hazards of explosives is of great significance to many aspects of safety emergency management practices in the production, transportation, storage, and use of explosives. It is known that the thermal stability of the ammonium perchlorate-aluminium system and the ammonium nitrate-aluminium system has been extensively investigated previously in the literature. However, there is a paucity of research on the thermal hazard characteristics of non-ideal explosives under varying oxygen balance conditions within the academic sphere. Therefore, this research focused on the study of the thermal hazards of non-ideal explosives based on thermokinetic analysis. The thermal hazards of non-ideal explosive mixtures of ammonium perchlorate and aluminium and of ammonium nitrate and aluminium were studied by thermal analysis kinetics. The thermokinetic parameters were meticulously studied through differential scanning calorimetry (DSC) analysis. The results showed that the peak reaction temperature and activation energy of the ammonium perchlorate-aluminium system were significantly higher than those of the ammonium nitrate-aluminium system. Under the condition of zero oxygen balance, the peak reaction temperature of the ammonium nitrate-aluminium system was 259 °C (heating rate 5 °C/min), and the activation energy was 84.7 kJ/mol. Under the same conditions, the peak reaction temperature and activation energy of the ammonium perchlorate-aluminium system were 292 °C (heating rate 5 °C/min) and 94.9 kJ/mol, respectively. These results indicate that the ammonium perchlorate-aluminium system has higher safety under the same thermal stimulation conditions. Furthermore, research on both non-ideal explosive systems reveals that the activation energy is at its peak under negative oxygen balance conditions, recorded at 104.2 kJ/mol (ammonium perchlorate-aluminium) and 86.2 kJ/mol (ammonium nitrate-aluminium), which indicates a higher degree of safety. Therefore, the investigation into the thermal hazards of non-ideal explosive systems under different oxygen balance conditions is of utmost importance for the enhancement and improvement of safety emergency management practices.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Thermal Hazard Analysis of Two Non-Ideal Explosives Based on Ammonium Perchlorate/Ammonium Nitrate and Aluminium Powder

Guo,

Chen,

et al. 2024

Molecules

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“…The experimental system was calibrated by a tungsten halogen lamp for the two-color pyrometer measurement with a high-speed camera, which had been mentioned in the previous studies [21,22]. As in Figure 2, the explosion temperature distribution and shock wave parameters of emulsion explosives with boron powders or boron powder type of microcapsules were measured by a high-speed camera (Memrecam HX-3, NAC, Japan) and a PCB sensor (137B24B, PCB, USA), respectively.…”

Section: Air Blast Experimentsmentioning

confidence: 99%

Effects of Boron Powders on the Detonation Performance of Emulsion Explosives

Cheng

Yao

et al. 2022

Propellants Explo Pyrotec

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To study the effects of boron powders on the detonation performance of emulsion explosives, the explosion temperature field, shock wave parameters and explosion heat of emulsion explosives were studied. The differences of boron powders with and without microcapsule cladding on improving the explosion performance were also discussed. Experimental results showed that, when the mass ratio of boron powders increased from 0 to 20 mass %, the average explosion temperature, explosion pressure, positive impulse and explosion heat of boroncontaining emulsion explosives increased at first and then decreased. When the content of boron powders was 16 mass %, the average explosion temperature, explosion pressure, positive impulse and explosion heat of emulsion explosives reached their maximum values of 2521 K, 0.0385 MPa, 7.11 Pa • s and 6335 kJ/kg, which were 22.2 %, 30.1 %, 43.0 % and 42.1 % higher than those of the pure emulsion explosive (Sample A), respectively. Furthermore, the explosion temperature, positive impulse and explosion heat of emulsion explosive with boron powder-microcapsule (Sample B5) were up to 2648 K, 7.65 Pa • s and 6694 kJ/kg, increased by 5.0 %, 7.6 % and 5.7 % when compared with those of emulsion explosive with 16 mass % boron powders (Sample B3). Therefore, micro-encapsulation technology could improve the detonation performance of boron-containing emulsion explosives, which would be helpful to the formula design of high energy emulsion explosives.

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“…Their influence has been studied especially by Bartknecht [7], but one can also find the latest scientific publications that examine the issue of interest. For example, the effect of moisture was investigated by [8][9][10][11], while the effect of particle size was investigated by [10,12,13], etc.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Pyrotechnic Igniter Composition Aging on Explosion Parameters of Dispersed Dusts

et al. 2021

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A commercially available pyrotechnic igniter was used according to the EN 14034 and ASTM E1226a Standards to study the explosiveness of dispersed dusts. Its pyrotechnic composition consists of 1.2 g of zirconium (40% wt.), barium peroxide (30% wt.) and barium nitrate (30% wt.). The energy released during the combustion of that amount of composition is 5 kJ. The article investigates the influence of aging of the pyrotechnic composition in the igniter on its initiation parameters. In the study, igniters of different years from date of manufacture were used: Igniter 1, manufactured in 2021 (less than 1 year from date of manufacture), and Igniter 2 (more than 2 years from date of manufacture). The study was performed in the KV 150M2 explosion chamber with a volume of 365 L and the 20 L sphere chamber with a volume of 20 L. A standard sample of Lycopodium clavatum was used in the KV 150M2 explosion chamber. Magnesium and benzoic acid were used as the samples in the 20 L sphere explosion chamber. The experiment showed that the explosion pressure Pmax of the igniter with more than 2 years from date of manufacture decreased by up to 10%, while the value of the explosion constant Kst decreased by up to 40%. The attained results proved that aging of igniters affects their explosion parameters and measurement accuracy.

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An investigation on the dust explosion of micron and nano scale aluminium particles

Cited by 22 publications

References 18 publications

Thermal Hazard Analysis of Two Non-Ideal Explosives Based on Ammonium Perchlorate/Ammonium Nitrate and Aluminium Powder

Thermal Hazard Analysis of Two Non-Ideal Explosives Based on Ammonium Perchlorate/Ammonium Nitrate and Aluminium Powder

Effects of Boron Powders on the Detonation Performance of Emulsion Explosives

Influence of the Pyrotechnic Igniter Composition Aging on Explosion Parameters of Dispersed Dusts

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