Chemical Reaction Mechanism and Mechanical Response of PTFE/Al/TiH2 Reactive Composites
| Autor: | Tao Guo, Jiaxing Song, Junyi Huang, Yuchun Li, Zhongshen Yu, Xiang Fang, Jun Zhang, Shuangzhang Wu |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Polytetrafluoroethylene Materials science Mechanical Engineering Titanium hydride chemistry.chemical_element 02 engineering and technology Strain hardening exponent Strain rate 021001 nanoscience & nanotechnology 01 natural sciences Chemical reaction chemistry.chemical_compound Compressive strength chemistry Mechanics of Materials 0103 physical sciences Hardening (metallurgy) General Materials Science Composite material 0210 nano-technology Titanium |
| Zdroj: | Journal of Materials Engineering and Performance. 28:7493-7501 |
| ISSN: | 1544-1024 1059-9495 |
| DOI: | 10.1007/s11665-019-04397-1 |
| Popis: | In order to improve the energy density of polytetrafluoroethylene/aluminum (PTFE/Al), titanium hydride (TiH2) was added as a high-energy additive, and thermogravimetry–differential scanning calorimetry (TG-DSC), quasi-static compression and Split-Hopkinson pressure bar (SHPB) tests were conducted to investigate the chemical reaction mechanism and mechanical response of PTFE/Al/TiH2. The results of TG-DSC indicate that TiH2 first decomposes to form titanium and hydrogen, and titanium reacts with PTFE to produce TiF3, and then with the temperature rising, titanium reacts with carbon and excessive aluminum to generate TiC and Al3Ti. Under quasi-static compression, the strength of PTFE/Al/TiH2 specimens can reach 108.8 Mpa, 14.2% higher than that of PTFE/Al, the special burning flames during the reaction and XRD patterns of the reaction residues consistently indicate that TiH2 has participated in the reaction and react completely, achieving its purpose as a high-energy additive. Under dynamic compression tests, PTFE/Al/TiH2 composites show obvious strain hardening and strain rate hardening effects, and the yield strength and compressive strength are sensitive to strain rates; the established Johnson-Cook (JC) constitutive model can describe the mechanical response of PTFE/Al/TiH2 material well. In addition, the ignition threshold of PTFE/Al/TiH2 drops to 22.78 m/s, less than that of PTFE/Al (23.74 m/s), and the ignition delay time is advanced from 650-700 to 100-150 μs as the impact velocity increase. |
| Databáze: | OpenAIRE |
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