Reactions and Morphologies of Mg and Mg/Teflon/Viton Particles during Oxidation
A thorough investigation on the reactions and morphologies of Mg particles and Mg/Teflon/Viton (MTV) during oxidation were conducted via thermal gravity-differential scanning calorimetry (TG-DSC) and scanning electronic microscopy. The results showed that the oxidation of Mg is fast. It merely chang...
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MDPI AG
2023-02-01
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| author | Yifan Li Jie Wang Dong Shen Haoying Liu Dongming Song Yanchun Li |
| author_facet | Yifan Li Jie Wang Dong Shen Haoying Liu Dongming Song Yanchun Li |
| author_sort | Yifan Li |
| collection | DOAJ |
| description | A thorough investigation on the reactions and morphologies of Mg particles and Mg/Teflon/Viton (MTV) during oxidation were conducted via thermal gravity-differential scanning calorimetry (TG-DSC) and scanning electronic microscopy. The results showed that the oxidation of Mg is fast. It merely changed the metallic luster of Mg before 550 °C, and only a few particles changed to a white irregular shape at 600 °C. However, all of the Mg particles oxidized to porous irregular shaped MgO at 650 °C. Herein, the oxidation of Mg particles ended by its melting point, and the whole process is a solid–gas-phase reaction. On the other hand, when MTV reacted in air, the reaction could be divided into two stages: the fluorination of Mg and the oxidation of the exceeded Mg. In the first stage, a dense MgF<sub>2</sub> shell was formed by the solid–solid fluorination. The dense MgF<sub>2</sub> shell could impede the oxidation of Mg. As a result, the oxidation of Mg began after its melting. Furthermore, liquid Mg could vaporize at higher temperature, which could burst out from the MgF<sub>2</sub> shell and react with oxygen. The MgF<sub>2</sub> shell exhibited a dense feature, not only protecting the Mg particles from the heterogeneous oxidation at lower temperature, but also facilitates the homogeneous oxidation at higher temperature. |
| first_indexed | 2024-03-11T08:25:34Z |
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| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-11T08:25:34Z |
| publishDate | 2023-02-01 |
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| spelling | doaj.art-cc0900f311844a79a0ded0a932cc37382023-11-16T22:09:01ZengMDPI AGMetals2075-47012023-02-0113241710.3390/met13020417Reactions and Morphologies of Mg and Mg/Teflon/Viton Particles during OxidationYifan Li0Jie Wang1Dong Shen2Haoying Liu3Dongming Song4Yanchun Li5Department of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210097, ChinaDepartment of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210097, ChinaZhejiang Material Industry Guanghua Civil Explosive Materials Co., Ltd., Hangzhou 310008, ChinaDepartment of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210097, ChinaDepartment of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210097, ChinaDepartment of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210097, ChinaA thorough investigation on the reactions and morphologies of Mg particles and Mg/Teflon/Viton (MTV) during oxidation were conducted via thermal gravity-differential scanning calorimetry (TG-DSC) and scanning electronic microscopy. The results showed that the oxidation of Mg is fast. It merely changed the metallic luster of Mg before 550 °C, and only a few particles changed to a white irregular shape at 600 °C. However, all of the Mg particles oxidized to porous irregular shaped MgO at 650 °C. Herein, the oxidation of Mg particles ended by its melting point, and the whole process is a solid–gas-phase reaction. On the other hand, when MTV reacted in air, the reaction could be divided into two stages: the fluorination of Mg and the oxidation of the exceeded Mg. In the first stage, a dense MgF<sub>2</sub> shell was formed by the solid–solid fluorination. The dense MgF<sub>2</sub> shell could impede the oxidation of Mg. As a result, the oxidation of Mg began after its melting. Furthermore, liquid Mg could vaporize at higher temperature, which could burst out from the MgF<sub>2</sub> shell and react with oxygen. The MgF<sub>2</sub> shell exhibited a dense feature, not only protecting the Mg particles from the heterogeneous oxidation at lower temperature, but also facilitates the homogeneous oxidation at higher temperature.https://www.mdpi.com/2075-4701/13/2/417Mg particlesMTVTG-DSCSEMEDS |
| spellingShingle | Yifan Li Jie Wang Dong Shen Haoying Liu Dongming Song Yanchun Li Reactions and Morphologies of Mg and Mg/Teflon/Viton Particles during Oxidation Metals Mg particles MTV TG-DSC SEM EDS |
| title | Reactions and Morphologies of Mg and Mg/Teflon/Viton Particles during Oxidation |
| title_full | Reactions and Morphologies of Mg and Mg/Teflon/Viton Particles during Oxidation |
| title_fullStr | Reactions and Morphologies of Mg and Mg/Teflon/Viton Particles during Oxidation |
| title_full_unstemmed | Reactions and Morphologies of Mg and Mg/Teflon/Viton Particles during Oxidation |
| title_short | Reactions and Morphologies of Mg and Mg/Teflon/Viton Particles during Oxidation |
| title_sort | reactions and morphologies of mg and mg teflon viton particles during oxidation |
| topic | Mg particles MTV TG-DSC SEM EDS |
| url | https://www.mdpi.com/2075-4701/13/2/417 |
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