Energy Release Characteristics and Reaction Mechanism of PTFE/Al/Bi<sub>2</sub>O<sub>3</sub> Reactive Materials under Drop-Hammer Test
To obtain the influence of the Bi<sub>2</sub>O<sub>3</sub> particle content of a PTFE/Al/Bi<sub>2</sub>O<sub>3</sub> reactive material (later referred to as PAB) on its shock-induced chemical reaction (SICR) characteristics, five kinds of PAB with diff...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-03-01
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| Series: | Polymers |
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| Online Access: | https://www.mdpi.com/2073-4360/14/7/1415 |
| _version_ | 1797437895116587008 |
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| author | Chunlan Jiang Rong Hu Liang Mao Zaicheng Wang Wenyu Xu Wanxiang Hu |
| author_facet | Chunlan Jiang Rong Hu Liang Mao Zaicheng Wang Wenyu Xu Wanxiang Hu |
| author_sort | Chunlan Jiang |
| collection | DOAJ |
| description | To obtain the influence of the Bi<sub>2</sub>O<sub>3</sub> particle content of a PTFE/Al/Bi<sub>2</sub>O<sub>3</sub> reactive material (later referred to as PAB) on its shock-induced chemical reaction (SICR) characteristics, five kinds of PAB with different Bi<sub>2</sub>O<sub>3</sub> contents were prepared; the reaction process in a drop-hammer test, recorded using a high-speed camera, was analyzed. The ignition and reaction mechanisms of PAB under mechanical impact were analyzed based on the thermochemical reaction characteristics and the microstructure. The results show that with an increase in Bi<sub>2</sub>O<sub>3</sub> content, the shock-induced chemical reaction duration and the sensitivity of PAB increase, and then decrease. When the Bi<sub>2</sub>O<sub>3</sub> content is 9%, the impact sensitivity is the highest and the reaction duration is the longest. The heating at the crack tip is responsible for PAB ignition under long-pulse low-velocity impact. During ignition, PAB undergoes several physicochemical changes such as the melting of PTFE, a PTFE/Bi<sub>2</sub>O<sub>3</sub> reaction, an Al/Bi<sub>2</sub>O<sub>3</sub> reaction, pyrolysis of the melted PTFE, and a C<sub>2</sub>F<sub>4</sub>/Al reaction; moreover, the presence of Bi<sub>2</sub>O<sub>3</sub> decreases the excitation threshold of the reactive material, which facilitates the propagation of the reaction and improves the degree of the reaction and overall energy release of the reactive material. |
| first_indexed | 2024-03-09T11:29:14Z |
| format | Article |
| id | doaj.art-2025ace4005742aa95e5988314e0bdb9 |
| institution | Directory Open Access Journal |
| issn | 2073-4360 |
| language | English |
| last_indexed | 2024-03-09T11:29:14Z |
| publishDate | 2022-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Polymers |
| spelling | doaj.art-2025ace4005742aa95e5988314e0bdb92023-11-30T23:54:06ZengMDPI AGPolymers2073-43602022-03-01147141510.3390/polym14071415Energy Release Characteristics and Reaction Mechanism of PTFE/Al/Bi<sub>2</sub>O<sub>3</sub> Reactive Materials under Drop-Hammer TestChunlan Jiang0Rong Hu1Liang Mao2Zaicheng Wang3Wenyu Xu4Wanxiang Hu5State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, ChinaState Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, ChinaState Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, ChinaState Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, ChinaState Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, ChinaState Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, ChinaTo obtain the influence of the Bi<sub>2</sub>O<sub>3</sub> particle content of a PTFE/Al/Bi<sub>2</sub>O<sub>3</sub> reactive material (later referred to as PAB) on its shock-induced chemical reaction (SICR) characteristics, five kinds of PAB with different Bi<sub>2</sub>O<sub>3</sub> contents were prepared; the reaction process in a drop-hammer test, recorded using a high-speed camera, was analyzed. The ignition and reaction mechanisms of PAB under mechanical impact were analyzed based on the thermochemical reaction characteristics and the microstructure. The results show that with an increase in Bi<sub>2</sub>O<sub>3</sub> content, the shock-induced chemical reaction duration and the sensitivity of PAB increase, and then decrease. When the Bi<sub>2</sub>O<sub>3</sub> content is 9%, the impact sensitivity is the highest and the reaction duration is the longest. The heating at the crack tip is responsible for PAB ignition under long-pulse low-velocity impact. During ignition, PAB undergoes several physicochemical changes such as the melting of PTFE, a PTFE/Bi<sub>2</sub>O<sub>3</sub> reaction, an Al/Bi<sub>2</sub>O<sub>3</sub> reaction, pyrolysis of the melted PTFE, and a C<sub>2</sub>F<sub>4</sub>/Al reaction; moreover, the presence of Bi<sub>2</sub>O<sub>3</sub> decreases the excitation threshold of the reactive material, which facilitates the propagation of the reaction and improves the degree of the reaction and overall energy release of the reactive material.https://www.mdpi.com/2073-4360/14/7/1415PTFE-based reactive materialscontent of Bi<sub>2</sub>O<sub>3</sub>shock-induced chemical reactiondrop-hammer test |
| spellingShingle | Chunlan Jiang Rong Hu Liang Mao Zaicheng Wang Wenyu Xu Wanxiang Hu Energy Release Characteristics and Reaction Mechanism of PTFE/Al/Bi<sub>2</sub>O<sub>3</sub> Reactive Materials under Drop-Hammer Test Polymers PTFE-based reactive materials content of Bi<sub>2</sub>O<sub>3</sub> shock-induced chemical reaction drop-hammer test |
| title | Energy Release Characteristics and Reaction Mechanism of PTFE/Al/Bi<sub>2</sub>O<sub>3</sub> Reactive Materials under Drop-Hammer Test |
| title_full | Energy Release Characteristics and Reaction Mechanism of PTFE/Al/Bi<sub>2</sub>O<sub>3</sub> Reactive Materials under Drop-Hammer Test |
| title_fullStr | Energy Release Characteristics and Reaction Mechanism of PTFE/Al/Bi<sub>2</sub>O<sub>3</sub> Reactive Materials under Drop-Hammer Test |
| title_full_unstemmed | Energy Release Characteristics and Reaction Mechanism of PTFE/Al/Bi<sub>2</sub>O<sub>3</sub> Reactive Materials under Drop-Hammer Test |
| title_short | Energy Release Characteristics and Reaction Mechanism of PTFE/Al/Bi<sub>2</sub>O<sub>3</sub> Reactive Materials under Drop-Hammer Test |
| title_sort | energy release characteristics and reaction mechanism of ptfe al bi sub 2 sub o sub 3 sub reactive materials under drop hammer test |
| topic | PTFE-based reactive materials content of Bi<sub>2</sub>O<sub>3</sub> shock-induced chemical reaction drop-hammer test |
| url | https://www.mdpi.com/2073-4360/14/7/1415 |
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