Improving the energy release characteristics of PTFE/Al by doping magnesium hydride

Wu, Jiaxiang; Liu, Qiang; Bin, Feng; Yin, Qiang; Li, Yuchun; Wu, Shuangzhang; Yu, Zhongshen; Huang, Junyi; Ren, Xinxin

doi:10.1016/j.dt.2020.12.008

Cited by 15 publications

(9 citation statements)

References 29 publications

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“…The endothermic peak B covers a temperature range from 530 °C to 601 °C, at the same time, the mass of the samples decreases according to the TG curve, indicating that the small gas molecule is produced from the decomposition of the PTFE matrix. Generally, violent exothermic reactions between the small gas molecules and Al particles will immediately occur after the decomposition of PTFE [ 5 , 30 ]. However, violent exothermic reactions were not found before the Al particles are melted in this experiment.…”

Section: Resultsmentioning

confidence: 99%

“…Dozens of RMs formulations were designed and the performances such as overpressure, perforation, and firelight size of reactive material enhanced projectiles in spacer plates were tested. Significantly different from traditional projectiles that use inert metal to penetrate, this enhanced projectile uses reactive damage elements to pierce armor, which could be initiated and releases a large amount of chemical energy during or after its penetration process, that is, it realizes the combined effect of projectile penetration and internal explosion, thus, greatly improving the damage effect inside the target [ 5 , 6 , 7 ].…”

Section: Introductionmentioning

confidence: 99%

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The Mechanical and Energy Release Performance of THV-Based Reactive Materials

Guo

Wang

et al. 2022

Materials

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A polymer of tetrafluoroethylene, hexafluoropropylene, and vinylidene fluoride- (THV) based reactive materials (RMs) was designed to improve their density and energy release efficiency. The mechanical performances, fracture mechanisms, thermal behavior, energy release behavior, and reaction energy of four types of RMs (26.5% Al/73.5% PTFE, 5.29% Al/80% W/14.71% PTFE, 62% Hf/38% THV, 88% Hf/12% THV) were systematically researched by conducting compressive tests, scanning electron microscope (SEM), differential scanning calorimeter, thermogravimetric (DSC/TG) tests and ballistic experiments. The results show that the THV-based RMs have a unique strain softening effect, whereas the PTFE-based RMs have a remarkable strain strengthening effect, which is mainly caused by the different glass transition temperatures. Thermal analysis indicates that the THV-based RMs have more than one exothermic peak because of the complex component in THV. The energy release behavior of RMs is closely related to their mechanical properties, which could dominate the fragmentation behavior of materials. The introduction of tungsten (W) particles to PTFE RMs could not only enhance the density but also elevate the reaction threshold of RMs, whereas the reaction threshold of THV-based RMs is decreased when increasing Hf particles content. As such, under current conditions, the THV-based RMs (88% Hf/12% THV) with a high density of 7.83 g/cm3 are adapted to release a lot of energy in thin, confined spaces.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Mechanical and Energy Release Performance of THV-Based Reactive Materials

Guo

Wang

et al. 2022

Materials

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“…However, its applications are restricted by its low mechanical strength and low reaction efficiency due to non-self-sustaining reactions. Many energetic components, such as hydrides [ 8 , 9 , 10 , 11 ], active metals [ 12 , 13 , 14 ], and oxides, have been introduced to PTFE/Al to enhance its energy release characteristics. Among them, the effects of adding oxides on the energy release characteristics of PTFE/Al has received much attention from scholars due to the excellent reaction performance and various reaction characteristics of thermite (Al/oxide).…”

Section: Introductionmentioning

confidence: 99%

Controlling Shock-Induced Energy Release Characteristics of PTFE/Al by Adding Oxides

et al. 2022

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Polytetrafluoroethylene (PTFE)/aluminum (Al)-based energetic material is a kind of energetic material with great application potential. In this research, the control of the shock-induced energy release characteristics of PTFE/Al-based energetic material by adding oxides (bismuth trioxide, copper oxide, molybdenum trioxide, and iron trioxide) was studied by experimentation and theoretical analysis. Ballistic impact experiments with impact velocity of 735~1290 m/s showed that the oxides controlled the energy release characteristics by the coupling of impact velocities and oxide characteristics. In these experiments, the overpressure characteristics, including the quasi-static overpressure peak, duration, and impulse, were used to characterize the energy release characteristics. It turned out that when the nominal impact velocity was 735 m/s, the quasi-static overpressure peak of PTFE/Al/MoO3 (0.1190 MPa) was 1.99 times higher than that of PTFE/Al (0.0598 Mpa). Based on these experimental results, an analytical model was developed indicating that the apparent activation energy and impact shock pressure dominated the energy release characteristic of PTFE/Al/oxide. This controlling mechanism indicated that oxides enhanced the reaction after shock wave unloading, and the chemical and physical properties of the corresponding thermites also affected the energy release characteristics. These conclusions can guide the design of PTFE-based energetic materials, especially the application of oxides in PTFE-based reactive materials.

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“…The energy output, compressive rate and burn rate (8863 J/g, 340 MPa/ms and 1626 m/s) were achieved for Al/PTFE by adding 9 wt% AP, which were much higher than that for pure PTFE/Al (2019 J/g, 29.3 MPa/ms and 260 m/s). Wu X et al, 22 mixed MgH 2 into Al/PTFE reactive material and obtained the reactive release energy, and the ignition threshold of the reactive material increased with the increase of MgH 2 content. Tang EL et al, 23 studied the impact response and shock‐induced ignition behavior of Al/PTFE reactive material by combining mesoscale simulation with explosive loading experiment.…”

Section: Introductionmentioning

confidence: 99%

Quantitative reactive release energy models of Al/Teflon material during high velocity impact

Tang

Wang

Chen

et al. 2022

Intl J of Energy Research

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Summary The reactive release energy of Al/Teflon projectile impacting on steel plate has a theoretical significance to explain the mechanism of shock‐induced reaction and impact initiation threshold of fluoropolymer‐based reactive materials. During the process of impact‐reaction in quasi‐closed container, the distributions of initial kinetic energy and impact reactive release energy are attributed to the gas enthalpy change, enthalpy change of spray gas, the internal energy absorbed by the container wall and the residual kinetic energy of the unreacted debris. Based on theoretical and experimental analysis, the energies allocated to each part are evaluated quantitatively. The results show that when the impact velocities are 402, 458, and 514 m/s, the reactive release energies of Al/Teflon are 3.276, 4.193, and 4.663 kJ/g, respectively. With the increase of projectile's velocity, the gas energy in the container, the spray gas energy and the internal energy absorbed by the container wall also increase, however the kinetic energy of the unreacted debris changes less. The internal energy absorbed by the container wall accounts for more than 90% of the total energy, and the total gas enthalpy change generated is less than 10%.

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Improving the energy release characteristics of PTFE/Al by doping magnesium hydride

Cited by 15 publications

References 29 publications

The Mechanical and Energy Release Performance of THV-Based Reactive Materials

The Mechanical and Energy Release Performance of THV-Based Reactive Materials

Controlling Shock-Induced Energy Release Characteristics of PTFE/Al by Adding Oxides

Quantitative reactive release energy models of Al/Teflon material during high velocity impact

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