Sustainable Pyrotechnics: Combustion Behavior of B4C/Bi2O3 for Delay Compositions
Danillo F. Vianna Cantini, Vojtěch Pelikán, Eva Schmidová, Jiří Pachman
TL;DR
This study investigates B4C and Bi2O3 as eco-friendly alternatives for pyrotechnic delay compositions, analyzing their combustion behavior and performance.
Contribution
The paper introduces B4C/Bi2O3 as a sustainable alternative for pyrotechnics and provides insights into their combustion mechanisms.
Findings
Increasing compaction reduces burning rates due to decreased porosity.
Combustion occurs in multiple stages, starting with a solid–solid preignition phase.
Particle and granule size influence the burning profile up to certain limits.
Abstract
Understanding the combustion behavior of greener pyrotechnic delay compositions is key to developing more sustainable and efficient materials for practical applications. This study explores B4C, a high-reactivity fuel, and Bi2O3, an efficient oxidizer, as eco-friendly alternatives to traditional formulations. Thermodynamic calculations guided formulation design, predicting major combustion products. After formulation, the compositions were granulated, pressed at varying pressures (64–385 MPa), burned, and analyzed for their burning rates. Results show that increasing compaction leads to a progressive decrease in burning rates, as reduced porosity shifts combustion from convective to conductive. Particle size influences combustion up to a certain limit, while the granule size of the final composition alters the burning profile. The reaction unfolds in multiple stages, starting with a…
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Taxonomy
TopicsEnergetic Materials and Combustion · Intermetallics and Advanced Alloy Properties · Thermal and Kinetic Analysis