Study of effect of binders and loading pressures on the performance of the time delay pyrotechnic compositions

Khan, Azizullah; Malik, Abdul; Lodhi, Zulfiqar H.; Badshah, Gul

doi:10.1080/07370652.2018.1441925

Cited by 10 publications

(3 citation statements)

References 9 publications

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“…Therefore, they affect sensitivity to friction and ESD [28]. They also affect the probability of a successful ignition and combustion performance (such as BR and LI) of a composition [27,29,30].…”

Section: Effect Of Binder Content On the Fs LI And Br Of Mg/ba(no 3 )...mentioning

confidence: 99%

Effect of Ingredients Ratio on the Friction Sensitivity and Burning Performances of Mg/Ba(NO₃)₂/Novolac Resin Pyrotechnic Compositions

Zhiani

2022

Propellants Explo Pyrotec

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Each pyrotechnic composition has specific sensitivity such as electrostatic discharge (ESD) sensitivity and friction sensitivity (FS), and it also has specific ignition performance, including luminous intensity (LI) and burning rate (BR). These parameters depend on the concentration of pyrotechnic composition ingredients. In this study, Mg/Ba(NO3)2/novolac resin compositions were prepared using different weight ratios (wt.%) of Mg, Ba(NO3)2, and novolac resin. Then, they were investigated by their FS, LI, and BR. The results showed that by increasing Ba(NO3)2 concentration from 33.76 to 84.54 wt.% Ba(NO3)2, the FS increases from 343 N to 65.5 N. However, the LI and BR of this composition increased by increasing Ba(NO3)2 concentration until a 3/1 stoichiometric ratio of Mg/Ba(NO3)2 (from 13086 to 20588 cd (candela) and 11.25 to 13.71 cm/s, respectively for 33.76 to 64.92 wt.% Ba(NO3)2) and decreased afterward (from 20488 to 53.24 cd and 13.71 to 6.45 cm/s, respectively). For Mg/Ba(NO3)2/novolac resin containing 3 to 12 wt.% novolac resin FS increased from 56 to above 360 N. LI and BR decreased from 20057 to 1203 cd and 17.3 to 1.2 cm/s, respectively. The stoichiometric ratio of Mg/Ba(NO3)2 has the highest enthalpy of reaction. Therefore, it can be concluded that it has the highest LI and BR.

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Section: Effect Of Binder Content On the Fs LI And Br Of Mg/ba(no 3 )...mentioning

confidence: 99%

Effect of Ingredients Ratio on the Friction Sensitivity and Burning Performances of Mg/Ba(NO₃)₂/Novolac Resin Pyrotechnic Compositions

Zhiani

2022

Propellants Explo Pyrotec

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“…The gasless delay compositions main components are oxidizer, fuel and binder. The main role of oxidizer as chlorates and chromates is to supply the required amount of oxygen during combustion [5][6][7]. Large amount of heat can be secured during oxidation of fuel which considered one of the vital components of delay composition [8].…”

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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“…After heat and oxidative aging, the HTPB coating's cross-linked network is destroyed, and the mechanical properties will deteriorate [2]. At the same time, HTPB coating will be influenced by dynamic load during storage and transportation, and the frequency of loading will also impair the dynamic mechanical properties [3]. Under the interaction of thermal oxygen aging and dynamic load, it will significantly affect the operational performance of HTPB coating, and even cause fatal strike to solid rocket motor (SRM).…”

Section: Introductionmentioning

confidence: 99%

Influence and Modeling of Loading Frequency on Dynamic Mechanical Properties of Thermally-Aging HTPB Coating

Zheng

Liu

2022

MSF

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For the sake of studying the influence of loading frequency on the hydroxyl-terminated polybutadiene (HTPB) coating’s dynamic mechanical properties during aging, the one month’s thermal accelerated aging test was carried out at 70°C. The dynamic mechanical properties of the aged HTPB coatings were tested through dynamic mechanical analysis (DMA) Q800 with the loading frequency range of 0~100Hz, the dynamic strain amplitude of 0.1% and the test temperature of 25°C. The change models of the dynamic modulus with the loading frequency were established. The results showed that with the extension of the aging time, the storage modulus and the loss modulus both rose, which were related with the change of the crosslinking network structure. The storage modulus increased exponentially with the loading frequency, and the correlation coefficients fitted by the exponential models were all greater than 0.96. The loss modulus changed in sections. When the loading frequency was less than 70 Hz, the loss modulus showed a cubic function growth relationship with the loading frequency, and the correlation coefficients were larger than 0.98; when the loading frequency was between 70 Hz and 100 Hz, the loss modulus showed a quadratic function relationship with the loading frequency that first decreased and then increased, and the correlation coefficients were all larger than 0.97.

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Study of effect of binders and loading pressures on the performance of the time delay pyrotechnic compositions

Cited by 10 publications

References 9 publications

Effect of Ingredients Ratio on the Friction Sensitivity and Burning Performances of Mg/Ba(NO₃)₂/Novolac Resin Pyrotechnic Compositions

Effect of Ingredients Ratio on the Friction Sensitivity and Burning Performances of Mg/Ba(NO₃)₂/Novolac Resin Pyrotechnic Compositions

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

Influence and Modeling of Loading Frequency on Dynamic Mechanical Properties of Thermally-Aging HTPB Coating

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Study of effect of binders and loading pressures on the performance of the time delay pyrotechnic compositions

Cited by 10 publications

References 9 publications

Effect of Ingredients Ratio on the Friction Sensitivity and Burning Performances of Mg/Ba(NO3)2/Novolac Resin Pyrotechnic Compositions

Effect of Ingredients Ratio on the Friction Sensitivity and Burning Performances of Mg/Ba(NO3)2/Novolac Resin Pyrotechnic Compositions

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

Influence and Modeling of Loading Frequency on Dynamic Mechanical Properties of Thermally-Aging HTPB Coating

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Product

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Effect of Ingredients Ratio on the Friction Sensitivity and Burning Performances of Mg/Ba(NO₃)₂/Novolac Resin Pyrotechnic Compositions

Effect of Ingredients Ratio on the Friction Sensitivity and Burning Performances of Mg/Ba(NO₃)₂/Novolac Resin Pyrotechnic Compositions