Combustion model for thermite materials integrating explicit and coupled treatment of condensed and gas phase kinetics

Tichtchenko, Emelian; Folliet, V.; Simonin, Olivier; Bédat, B.; Glavier, Ludovic; Estève, Alain; Rossi, Carole

doi:10.1016/j.proci.2022.08.117

Cited by 9 publications

(3 citation statements)

References 20 publications

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“…In addition, the model integrates an ensemble of chemical reactions, and physical transformations that are known to occur during the thermite reaction [29]. The detailed description of the model developed for thermite combustion prediction is outside the scope of this paper as it was already published [30]. Results not only confirm the experimental findings, e. g. the particles size mainly influences the reaction kinetics and pressure development, but importantly give an understanding of their underlying mechanisms.…”

Section: Introductionmentioning

confidence: 57%

Section: Introductionmentioning

confidence: 99%

“…x(c) reactions on condensed phases Detailed in Ref [30]. Spaldingquasi-steady state formulation/spontaneous reaction Al, O, O 2 , Al 2 O, AlO, Al 2 O 2 , AlO 2 Reaction Gas phase kinetics T A B L E 2 List of heat transfer mechanisms implemented to model the Al/CuO thermite initiation/combustion.…”

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confidence: 99%

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Comprehending the influence of the particle size and stoichiometry on Al/CuO thermite combustion in close bomb: A theoretical study

Tichtchenko

Bédat²,

Simonin³

et al. 2023

Propellants Explo Pyrotec

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The paper is a theoretical exploration of complex Al/CuO thermite combustion processes, using a zero-dimensional (0D) model which integrates both condensed phase and gas phase reactions, and considers all thermodynamic stable molecular or atomic species identified during the Al + CuO reaction. We found that the particle size mainly influences the reaction kinetics and pressure development. Thermite with nano-sized particles (nanothermites) burns ~10 times faster than the same thermite with micron-sized particles (microthermites). This is due to the fact that the thermite reaction occurs mainly in condensed phase, i. e. in the melted Al phase, as all gaseous oxygens released by the CuO decomposition are spontaneously absorbed on the huge specific surface area of metallic Al. As a consequence, the pressure development in nanothermites follows the thermite chemical reaction, the gas phase is mostly composed of a metal vapor (mostly Cu and Al), Al suboxides, but is free of molecular oxygen. In contrast, when dealing with microthermites, an oxygen pressure peak occurs prior to the thermite reaction due to the gaseous O 2 released by the early CuO decomposition, that cannot be absorbed on the Al particles surface in real time. The powder stoichiometry greatly impacts the final pressure. Al lean thermites generate a higher final pressure (× 3) than stoichiometric and Al rich mixtures, due to unreacted gaseous oxygen which remains in the gas phase after the full consumption of the metallic Al.

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Section: Introductionmentioning

confidence: 57%

Section: Introductionmentioning

confidence: 99%

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Comprehending the influence of the particle size and stoichiometry on Al/CuO thermite combustion in close bomb: A theoretical study

Tichtchenko

Bédat²,

Simonin³

et al. 2023

Propellants Explo Pyrotec

Self Cite

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Transfer of Self‐Sustained Reactions between Thermally Coupled Reactive Material Elements

Shekhawat,

Breiter,

Döll

et al. 2024

Adv Eng Mater

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System engineering requires the implementation of assembly methods allowing the formation of functional elements according to a desired system design. This is possible by joining prefabricated elements on a desired place in the system or by forming functional materials at wanted locations. Both approaches need temperature treatment. A typical system in part consists of materials restricting the use of annealing procedures above 300 °C. For this reason, higher‐temperature operations have to be localized to the point of use and transferred to the next reactive element. A further requirement is the reduction of the thermal budget of the localized joining process implementing ultrashort heat treatment operations. Reactive metallic multilayer offers the combined possibility of implementing a localized heat source and the formation of a functional intermetallic alloy. The article demonstrates the feasibility of a heat and reaction transfer chain in a topological structured pattern consisting of localized reactive multilayer materials under conditions of their gasless combustion. For the used Ni/Al multilayer material system, the critical (obstacle thickness) dimensions for the reaction and heat transfer are determined using a high‐speed camera and pyrometer measurements.

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Full factorial design analysis of thermodynamic and kinetic parameters in simulated thermite reaction propagation

Souza

Lemos

2023

Continuum Mech. Thermodyn.

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Combustion model for thermite materials integrating explicit and coupled treatment of condensed and gas phase kinetics

Cited by 9 publications

References 20 publications

Comprehending the influence of the particle size and stoichiometry on Al/CuO thermite combustion in close bomb: A theoretical study

Comprehending the influence of the particle size and stoichiometry on Al/CuO thermite combustion in close bomb: A theoretical study

Transfer of Self‐Sustained Reactions between Thermally Coupled Reactive Material Elements

Full factorial design analysis of thermodynamic and kinetic parameters in simulated thermite reaction propagation

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