REACTION KINETICS SELF-PROPOGATION REGIME DURING PRE-IGNITION PERIOD
Self-propagation high temperature synthesis (SHS) technological regulations application is mainly limited by transformation processes taking place in the pre-ignition period. Zn-S, Zn-Se, Ti-C and 3Ni-Al small sample systems ignition experimental study was carried out under heating conditions in ine...
| Main Author: | |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Odessa I. I. Mechnikov National University
2015-11-01
|
| Series: | Vìsnik Odesʹkogo Nacìonalʹnogo Unìversitetu: Hìmìâ |
| Subjects: | |
| Online Access: | http://heraldchem.onu.edu.ua/article/view/54004 |
| _version_ | 1818020636545515520 |
|---|---|
| author | D. D. Polishchuk |
| author_facet | D. D. Polishchuk |
| author_sort | D. D. Polishchuk |
| collection | DOAJ |
| description | Self-propagation high temperature synthesis (SHS) technological regulations application is mainly limited by transformation processes taking place in the pre-ignition period. Zn-S, Zn-Se, Ti-C and 3Ni-Al small sample systems ignition experimental study was carried out under heating conditions in inert atmosphere with temperature values T = 1200K.It was shown that at this temperature level a chemical reaction can be initiated, turning into a self-sustaining mode. Wherein the reaction limiting factors can be mass transfer processes. Ignition temperatures were determined and plotted via the samples size. A physical ignition model was developed assuming the pre-ignition period limiting reaction Arrhenius law.The inverse combustion problem solution made it possible to calculate the low-temperature (T = 800 ÷ 1200K) reaction kinetic constant values. Comparison thus obtained values with the known data of other researchers showed their good agreement.Activation energy values for the Zn-S system were used to calculate the heat wave propagation speed. This value appeared to coincide with experimental values.Obtained results analysis leads to the conclusion about the availability and justification for the proposed method of express-analysis of presupposed, but previously not studied SHS systems. The results thus obtained allow us to estimate conditions for the SHS technology implementation, the reactor characteristic sizes and the thermal wave’s propagation speed. |
| first_indexed | 2024-04-14T08:07:56Z |
| format | Article |
| id | doaj.art-40614705b8674210a164a63bd05925c9 |
| institution | Directory Open Access Journal |
| issn | 2304-0947 2414-5963 |
| language | English |
| last_indexed | 2024-04-14T08:07:56Z |
| publishDate | 2015-11-01 |
| publisher | Odessa I. I. Mechnikov National University |
| record_format | Article |
| series | Vìsnik Odesʹkogo Nacìonalʹnogo Unìversitetu: Hìmìâ |
| spelling | doaj.art-40614705b8674210a164a63bd05925c92022-12-22T02:04:39ZengOdessa I. I. Mechnikov National UniversityVìsnik Odesʹkogo Nacìonalʹnogo Unìversitetu: Hìmìâ2304-09472414-59632015-11-01203(55)253310.18524/2304-0947.2015.3(55).5400454004REACTION KINETICS SELF-PROPOGATION REGIME DURING PRE-IGNITION PERIODD. D. Polishchuk0Одеський національний університет імені І. І. МечниковаSelf-propagation high temperature synthesis (SHS) technological regulations application is mainly limited by transformation processes taking place in the pre-ignition period. Zn-S, Zn-Se, Ti-C and 3Ni-Al small sample systems ignition experimental study was carried out under heating conditions in inert atmosphere with temperature values T = 1200K.It was shown that at this temperature level a chemical reaction can be initiated, turning into a self-sustaining mode. Wherein the reaction limiting factors can be mass transfer processes. Ignition temperatures were determined and plotted via the samples size. A physical ignition model was developed assuming the pre-ignition period limiting reaction Arrhenius law.The inverse combustion problem solution made it possible to calculate the low-temperature (T = 800 ÷ 1200K) reaction kinetic constant values. Comparison thus obtained values with the known data of other researchers showed their good agreement.Activation energy values for the Zn-S system were used to calculate the heat wave propagation speed. This value appeared to coincide with experimental values.Obtained results analysis leads to the conclusion about the availability and justification for the proposed method of express-analysis of presupposed, but previously not studied SHS systems. The results thus obtained allow us to estimate conditions for the SHS technology implementation, the reactor characteristic sizes and the thermal wave’s propagation speed.http://heraldchem.onu.edu.ua/article/view/54004синтез, спалахування, кінетика, енергія активації |
| spellingShingle | D. D. Polishchuk REACTION KINETICS SELF-PROPOGATION REGIME DURING PRE-IGNITION PERIOD Vìsnik Odesʹkogo Nacìonalʹnogo Unìversitetu: Hìmìâ синтез, спалахування, кінетика, енергія активації |
| title | REACTION KINETICS SELF-PROPOGATION REGIME DURING PRE-IGNITION PERIOD |
| title_full | REACTION KINETICS SELF-PROPOGATION REGIME DURING PRE-IGNITION PERIOD |
| title_fullStr | REACTION KINETICS SELF-PROPOGATION REGIME DURING PRE-IGNITION PERIOD |
| title_full_unstemmed | REACTION KINETICS SELF-PROPOGATION REGIME DURING PRE-IGNITION PERIOD |
| title_short | REACTION KINETICS SELF-PROPOGATION REGIME DURING PRE-IGNITION PERIOD |
| title_sort | reaction kinetics self propogation regime during pre ignition period |
| topic | синтез, спалахування, кінетика, енергія активації |
| url | http://heraldchem.onu.edu.ua/article/view/54004 |
| work_keys_str_mv | AT ddpolishchuk reactionkineticsselfpropogationregimeduringpreignitionperiod |