Changes in the composition of synthesis products upon transitioning from self-ignition to combustion
- Authors: Seplyarskii B.S.1, Ivleva T.P.1, Grachev V.V.1, Merzhanov A.G.1
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Affiliations:
- Institute of Structural Macrokinetics and Materials Science
- Issue: Vol 91, No 7 (2017)
- Pages: 1204-1213
- Section: Chemical Kinetics and Catalysis
- URL: https://journals.rcsi.science/0036-0244/article/view/169587
- DOI: https://doi.org/10.1134/S0036024417070263
- ID: 169587
Cite item
Abstract
Changes in the chemical composition of condensed products upon switching from synthesis in the self-ignition mode to combustion synthesis is studied by approximate analytical and numerical means for condensed substances that react via competing reaction pathways. It is shown that these different modes of synthesis produce different compositions of the reaction products. The conditions required for transitioning from one mode of combustion initiation (thermal explosion) to another (ignition) are determined. It is found that this transition can occur upon changing the temperature of a heater by just two characteristic intervals. A scaling procedure that allows the calculation results obtained at zero dimensionless temperature of the heater to be used to determine the effect its non-zero dimensionless temperature has on the ignition mode and the composition of the obtained products is proposed. Calculations show that materials with different distributions of the chemical composition along the sample can be obtained by deliberately changing the temperature of the heater.
About the authors
B. S. Seplyarskii
Institute of Structural Macrokinetics and Materials Science
Author for correspondence.
Email: seplb1@mail.ru
Russian Federation, Chernogolovka, 142432
T. P. Ivleva
Institute of Structural Macrokinetics and Materials Science
Email: seplb1@mail.ru
Russian Federation, Chernogolovka, 142432
V. V. Grachev
Institute of Structural Macrokinetics and Materials Science
Email: seplb1@mail.ru
Russian Federation, Chernogolovka, 142432
A. G. Merzhanov
Institute of Structural Macrokinetics and Materials Science
Email: seplb1@mail.ru
Russian Federation, Chernogolovka, 142432