Mechanistic investigation of electric field-activated self-propagating reactions: experimental and modeling studies
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Data
2000-01
Autori
Orrù, Roberto
Cincotti, Alberto
Cao, Giacomo
Munir, Z. A.
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Abstract
The mechanism of electric field-activated self-propagating reactions is investigated using the
combustion front quenching technique. In particular, previously published experimental results obtained through the Field Assisted Combustion Synthesis (FACS) of b-SiC, TaC, Ti3Al and B4C-TiB2 are re-examined and compared. Pre-combustion and combustion stages involved during synthesis wave propagation are postulated for all systems. Subsequently, modeling results aimed at simulating the process where an electric field-activated self-propagating reaction takes place are presented. In particular, a one-dimensional model of FACS technique is developed to simulate the rapid quenching of the reaction during its progress as the applied field is turned off. A rate expression which accounts for the influence of temperature, particle size, compaction density, reactant stoichiometry, and inert content is included in the model.
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Keywords
field assisted combustion synthesis (FACS) , combustion modeling , Self-propagating High-temperature Synthesis (SHS)