Abstract
Relevant to the self-propagating high-temperature synthesis (SHS) process, an analytical study has been conducted to investigate the effects of electric field on the combustion behavior because the electric field is indispensable for systems with weak exothermic reactions to sustain flame propagation. In the present study, use has been made of the heterogeneous theory which can satisfactorily account for the premixed mode of the bulk flame propagation supported by the nonpremixed mode of particle consumption. It has been confirmed that, even for the SHS flame propagation under electric field, being well recognized to be facilitated, there exists a limit of flammability, due to heat loss, as is the case for the usual SHS flame propagation. Since the heat loss is closely related to the representative sizes of particles and compacted specimen, this identification provides useful insight into manipulating the SHS flame propagation under electric field, by presenting appropriate combinations of those sizes. A fair degree of agreement has been demonstrated through conducting an experimental comparison, as far as the trend and the approximate magnitude are concerned, suggesting that an essential feature has been captured by the present study.
Highlights
Self-propagating high-temperature synthesis (SHS) process, by virtue of a strong exothermic reaction that passes through a compacted mixture of particles, as a flame, has attracted special interests as a rapid and economical way in synthesizing inorganic and/or intermetallic compounds [1,2,3,4,5]
Even though the electric field is effective in sustaining SHS flame propagation, there exists an indispensable requirement for the flame position to be positive, which further requires that the logarithmic term in (27) should be positive
Flame propagation in the SHS process of the Si-C system has been examined by the use of the heterogeneous theory, with taking account of an effect of electric field
Summary
Self-propagating high-temperature synthesis (SHS) process, by virtue of a strong exothermic reaction that passes through a compacted mixture of particles, as a flame, has attracted special interests as a rapid and economical way in synthesizing inorganic and/or intermetallic compounds [1,2,3,4,5]. Focus is put on the SHS flame propagation that proceeds in the compacted mixture of SiC system, from the viewpoint of combustion engineering, which has been rare, examinations from the viewpoint of materials science have been conducted extensively [14,15,16,17,18,19,20]. Experimental comparisons are conducted, which are found to be satisfactory, as far as the trend and approximate magnitude are concerned
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