The Effect of Al Particles Size on the Thermal Behavior and Kinetics of Al-MnO2 Thermite System
Micron-MnO2 powder has unique thermal decomposition process compared with other metal oxides, and the different characteristics of components in thermite could affect the thermal performance of the whole system directly. In this work, the Al powder with different three particle sizes was combined wi...
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| Main Authors: | , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2020-01-01
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| Series: | Advances in Materials Science and Engineering |
| Online Access: | http://dx.doi.org/10.1155/2020/3097404 |
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| author | Jia-xing Song Tao Guo Wen Ding Miao Yao Li Yang Xiao-nan Zhang Zhong-shen Yu Jia-xiang Wu Jun Zhang Xiang Fang |
| author_facet | Jia-xing Song Tao Guo Wen Ding Miao Yao Li Yang Xiao-nan Zhang Zhong-shen Yu Jia-xiang Wu Jun Zhang Xiang Fang |
| author_sort | Jia-xing Song |
| collection | DOAJ |
| description | Micron-MnO2 powder has unique thermal decomposition process compared with other metal oxides, and the different characteristics of components in thermite could affect the thermal performance of the whole system directly. In this work, the Al powder with different three particle sizes was combined with micron-MnO2 to prepare the Al-MnO2 thermite system, and the effect of Al powder particle sizes on the whole thermal behavior was studied. Firstly, the thermal decomposition process of micron-MnO2 and purity of Al powder are tested by TG-DSC. By using ultrasonic dispersion method, the fuel-rich thermite samples were prepared and characterized by SEM and TG-DSC at different heating rates. The Kissinger method was also employed to calculate the activation energy for the first exothermic peak. It was found that the thermal decomposition process of MnO2 in the thermite system can be significantly disturbed by different Al particles size. In other words, the effect of Al particle sizes on the thermite can be magnified due to the unique decomposition properties of micron-MnO2 instead of onset temperature of exothermic reaction changing simply. The activation energy of thermite system decreased with the reduction of Al particle sizes in micron-level, while in nanolevel the activation energy markedly increased. Finally, the possible reasons for phenomenon were discussed. |
| format | Article |
| id | doaj-art-021caa7b30da4e43aff94a1e01cc2a2b |
| institution | Kabale University |
| issn | 1687-8434 1687-8442 |
| language | English |
| publishDate | 2020-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Materials Science and Engineering |
| spelling | doaj-art-021caa7b30da4e43aff94a1e01cc2a2b2025-02-03T01:01:29ZengWileyAdvances in Materials Science and Engineering1687-84341687-84422020-01-01202010.1155/2020/30974043097404The Effect of Al Particles Size on the Thermal Behavior and Kinetics of Al-MnO2 Thermite SystemJia-xing Song0Tao Guo1Wen Ding2Miao Yao3Li Yang4Xiao-nan Zhang5Zhong-shen Yu6Jia-xiang Wu7Jun Zhang8Xiang Fang9College of Field Engineering, Army Engineering University of PLA, Nanjing 210007, ChinaCollege of Field Engineering, Army Engineering University of PLA, Nanjing 210007, ChinaCollege of Field Engineering, Army Engineering University of PLA, Nanjing 210007, ChinaCollege of Field Engineering, Army Engineering University of PLA, Nanjing 210007, ChinaCollege of Field Engineering, Army Engineering University of PLA, Nanjing 210007, ChinaCollege of Field Engineering, Army Engineering University of PLA, Nanjing 210007, ChinaCollege of Field Engineering, Army Engineering University of PLA, Nanjing 210007, ChinaCollege of Field Engineering, Army Engineering University of PLA, Nanjing 210007, ChinaCollege of Field Engineering, Army Engineering University of PLA, Nanjing 210007, ChinaCollege of Field Engineering, Army Engineering University of PLA, Nanjing 210007, ChinaMicron-MnO2 powder has unique thermal decomposition process compared with other metal oxides, and the different characteristics of components in thermite could affect the thermal performance of the whole system directly. In this work, the Al powder with different three particle sizes was combined with micron-MnO2 to prepare the Al-MnO2 thermite system, and the effect of Al powder particle sizes on the whole thermal behavior was studied. Firstly, the thermal decomposition process of micron-MnO2 and purity of Al powder are tested by TG-DSC. By using ultrasonic dispersion method, the fuel-rich thermite samples were prepared and characterized by SEM and TG-DSC at different heating rates. The Kissinger method was also employed to calculate the activation energy for the first exothermic peak. It was found that the thermal decomposition process of MnO2 in the thermite system can be significantly disturbed by different Al particles size. In other words, the effect of Al particle sizes on the thermite can be magnified due to the unique decomposition properties of micron-MnO2 instead of onset temperature of exothermic reaction changing simply. The activation energy of thermite system decreased with the reduction of Al particle sizes in micron-level, while in nanolevel the activation energy markedly increased. Finally, the possible reasons for phenomenon were discussed.http://dx.doi.org/10.1155/2020/3097404 |
| spellingShingle | Jia-xing Song Tao Guo Wen Ding Miao Yao Li Yang Xiao-nan Zhang Zhong-shen Yu Jia-xiang Wu Jun Zhang Xiang Fang The Effect of Al Particles Size on the Thermal Behavior and Kinetics of Al-MnO2 Thermite System Advances in Materials Science and Engineering |
| title | The Effect of Al Particles Size on the Thermal Behavior and Kinetics of Al-MnO2 Thermite System |
| title_full | The Effect of Al Particles Size on the Thermal Behavior and Kinetics of Al-MnO2 Thermite System |
| title_fullStr | The Effect of Al Particles Size on the Thermal Behavior and Kinetics of Al-MnO2 Thermite System |
| title_full_unstemmed | The Effect of Al Particles Size on the Thermal Behavior and Kinetics of Al-MnO2 Thermite System |
| title_short | The Effect of Al Particles Size on the Thermal Behavior and Kinetics of Al-MnO2 Thermite System |
| title_sort | effect of al particles size on the thermal behavior and kinetics of al mno2 thermite system |
| url | http://dx.doi.org/10.1155/2020/3097404 |
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