The Effect of Ambient Temperature and Boron Content on the Burning Rate of the B/Pb<sub>3</sub>O<sub>4</sub>Delay Compositions

Li, Yanchun; Cheng, Yi; Hui, Yun-Long; Shi, Yan

doi:10.1080/07370650903193299

Cited by 12 publications

(3 citation statements)

References 7 publications

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“…0.26 mm s À1 K À1 is in accord with the experimental data of Jakubko [14] and Boddington et al [15]. However, Li et al [16] observed a somewhat lower slope for various fuel-lean B + Pb 3 O 4 compositions.…”

Section: Burning Ratessupporting

confidence: 88%

Measurement and Modelling of Pyrotechnic Time Delay Burning Rates: Application and Prediction of a Fast Burning Delay Composition

Montgomery

Focke

Kelly

2017

Propellants Explo Pyrotec

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A predictive numerical model was implemented for a time delay based on the Si + Pb 3 O 4 system. The reaction kinetic parameters were estimated by comparing predicted surface temperature profiles with experimental data acquired with an infrared camera. Fair agreement between the modelled and measured burning rates was achieved. The burning rate is predicted to increase by 9.4 % for every 50 8C increase in ambient temperature. The core diameter was found to have a slightly larger impact on the burning rate than the wall thickness. The effect of using different wall thickness materials was evaluated and indicated that the burning rate is significantly influenced by the wall material when the thermal conductivity is increased and the volumetric heat capacity is reduced. The shape of the combustion front was found to widen with a long tail for materials with a low thermal conductivity and a narrower combustion front with a short tail for materials with high thermal conductivity. Preheating occurred for pyrolytic graphite-and diamond-based elements but no radial combustion was observed. The external heat transfer parameters (convection and radiation) did not affect the burning rate of the fast delay composition. It is concluded that the ambient temperature, volume fraction solids, molar heat of reaction, core and outer diameter are the factors that most significantly influence the burning rate of the Si + Pb 3 O 4 composition in long cylindrical elements.

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Section: Burning Ratessupporting

confidence: 88%

Measurement and Modelling of Pyrotechnic Time Delay Burning Rates: Application and Prediction of a Fast Burning Delay Composition

Montgomery

Focke

Kelly

2017

Propellants Explo Pyrotec

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“…The burning rates of B/Pb 3 O 4 delay compositions were also investigated [127]. The boron content was varied from 1 to 16 % and the ambient temperature from À50 8C up to 70 8C.…”

Section: Boron As Fuelmentioning

confidence: 99%

“…In another variation of this method, the timer is started via a sound sensor which is activated by the explosive noise emitted by the shock tube [20,26]. Further variations of this method includes replacing the optical sensor with a thermocouple or using two optical sensors for the starting and ending condition [20,127]. The use of optical sensors, however requires the delay element to be open-ended, which reduces the level of confinement in the delay element.…”

Section: Chemical and Phase Compositionmentioning

confidence: 99%

Review of Gasless Pyrotechnic Time Delays

Focke

Tichapondwa

Montgomery

et al. 2018

Propellants Explo Pyrotec

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Gasless pyrotechnic delay compositions for time‐sequencing energetic events are reviewed. They are mixtures of powdered fuels and oxidants capable of a highly exothermic oxidation‐reduction reaction. Trends favor ‘green’ compositions targeted to replace compositions containing perchlorates, chromates, lead and barium. Thermite‐based reactions dominate but intermetallics (especially multi‐layered versions) and hybrids appear promising considering progress in self‐propagating high temperature synthesis technology. Improving computer modelling will require better description of condensed phase reactions. Progress was made with the development of “hot spot” models and expressing reactivity in terms of the number of contact points (or contact surface area) between particles. Promising processing advances include mechanochemical synthesis of reactive particle composites by arrested milling or comminution of cold‐rolled multilayer intermetallics. Dry mixing of reactive powders has made way for slurry mixing followed by spray drying.

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Design and study of ADC/BCN/metal oxide gas-generating agents

Yang

Zhu

et al. 2015

J Therm Anal Calorim

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Characterized with low burning temperature and low concentration of toxic gases, the azodicarbonamide (ADC), basic cupric nitrate (BCN) and 10 % metal oxide (CuO, ZnO, MnO 2 , Fe 2 O 3 ) gas-generating agents have been investigated. The thermal analysis results show that the thermal decomposition process of ADC/ BCN/metal oxide is similar to that of ADC/BCN, and the addition of metal oxides makes the initial decomposition temperature decrease. Among the ADC/BCN/metal oxide mixtures that were examined, ADC/BCN/CuO mixture exhibits a better burning performance. The maximum burning temperature (735°C) and combustion heat (1900.5 J g -1 ) have a relatively low value, and the content of CO is the lowest (8390 ppm).

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The Effect of Ambient Temperature and Boron Content on the Burning Rate of the B/Pb₃O₄Delay Compositions

Cited by 12 publications

References 7 publications

Measurement and Modelling of Pyrotechnic Time Delay Burning Rates: Application and Prediction of a Fast Burning Delay Composition

Measurement and Modelling of Pyrotechnic Time Delay Burning Rates: Application and Prediction of a Fast Burning Delay Composition

Review of Gasless Pyrotechnic Time Delays

Design and study of ADC/BCN/metal oxide gas-generating agents

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The Effect of Ambient Temperature and Boron Content on the Burning Rate of the B/Pb3O4Delay Compositions

Cited by 12 publications

References 7 publications

Measurement and Modelling of Pyrotechnic Time Delay Burning Rates: Application and Prediction of a Fast Burning Delay Composition

Measurement and Modelling of Pyrotechnic Time Delay Burning Rates: Application and Prediction of a Fast Burning Delay Composition

Review of Gasless Pyrotechnic Time Delays

Design and study of ADC/BCN/metal oxide gas-generating agents

Contact Info

Product

Resources

About

The Effect of Ambient Temperature and Boron Content on the Burning Rate of the B/Pb₃O₄Delay Compositions