Sintering Reaction and Pyrolysis Process Analysis of Al/Ta/PTFE
Abstract
:1. Introduction
2. Experiment Section
2.1. Raw Material and Sample Preparation
2.2. Experimental Contents
3. Results and Discussion
3.1. Sintering Reaction of Ta/PTFE and Al/ Ta/PTFE and Analysis of the Sintering Products
3.2. TG-DSC and XRD Phase Analysis of Four Groups of Reactive Materials
3.3. Analysis of Reaction Mechanism of Al/Ta/PTFE System
4. Conclusions
- Ta and PTFE chemically react when heated to 360 °C to form a soft and fluffy white material TaF3 and carbon black. TaF3 can overflow the surface of the specimen, causing cracking of the compacted cylindrical specimen, and scatter on the placement plate of specimens. This is presumably because the density of the substance is lower than that of the pressed specimens and the melting point is less than 360 °C.
- The results of the XRD phase detection show that there is TaF3 in the residue of TG-DSC specimen at 350 °C and 360 °C, indicating that Ta and PTFE have reacted at 340–350 °C. However, no obvious reaction exothermic peak is found on TG-DSC curves of Ta/PTFE and Al/Ta/PTFE. It is possibly because the reaction generates little energy and coincides with the melting process of PTFE, and the liberated heat is absorbed for PTFE to melt.
- It is speculated that the reaction mechanism of the Ta/PTFE system is that PTFE decomposes first, and then the product reacts with the highly oxidizable metal Ta to generate TaF3 and carbon black. TG-DSC test of PTFE and Al/PTFE shows that the decomposition temperature of PTFE starts at about 500 °C, which does not agree with the scope of the reaction temperature. It is speculated that PTFE does decompose before 500 °C, which could not be detected effectively, because the decomposition is weak, or the introduction of the metal Ta could affect decomposition of PTFE. Therefore, Ta reacts with PTFE during the sintering process.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Reactive Material | Composition (wt.%) | ||
---|---|---|---|
Al | Ta | PTFE | |
PTFE | - | - | 100 |
Al/PTFE | 26.5 | - | 73.5 |
Ta/PTFE | - | 48.55 | 51.45 |
Al/Ta/PTFE | 18.55 | 30 | 51.45 |
Materials | Starting Temperature/°C | Peak Temperature/°C | Termination Temperature/°C | Melting Enthalpy/J·g−1 |
---|---|---|---|---|
PTFE | 325.2 | 344.45 | 363.1 | 78.56 |
Al/PTFE | 329.8 | 341.4 | 350.6 | 52.54 |
Ta/PTFE | 331.0 | 343.0 | 353.5 | 29.57 |
Al/Ta/PTFE | 330.5 | 342.4 | 353.1 | 40.37 |
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Zhang, J.; Huang, J.; Li, Y.; Liu, Q.; Yu, Z.; Wu, J.; Gao, Z.; Wu, S.; Kui, J.; Song, J. Sintering Reaction and Pyrolysis Process Analysis of Al/Ta/PTFE. Polymers 2019, 11, 1469. https://doi.org/10.3390/polym11091469
Zhang J, Huang J, Li Y, Liu Q, Yu Z, Wu J, Gao Z, Wu S, Kui J, Song J. Sintering Reaction and Pyrolysis Process Analysis of Al/Ta/PTFE. Polymers. 2019; 11(9):1469. https://doi.org/10.3390/polym11091469
Chicago/Turabian StyleZhang, Jun, Junyi Huang, Yuchun Li, Qiang Liu, Zhongshen Yu, Jiaxiang Wu, Zhenru Gao, Shuangzhang Wu, Jiaying Kui, and Jiaxing Song. 2019. "Sintering Reaction and Pyrolysis Process Analysis of Al/Ta/PTFE" Polymers 11, no. 9: 1469. https://doi.org/10.3390/polym11091469