Impact-Induced Reaction Characteristic and the Enhanced Sensitivity of PTFE/Al/Bi2O3 Composites

Yuan, Ying; Geng, Baoqun; Sun, Tao; Yu, Qingbao; Wang, Haifu

doi:10.3390/polym11122049

Cited by 17 publications

(9 citation statements)

References 18 publications

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“…The internal force is more likely to be concentrated in a small area, as it is more difficult for the impact force to be dispersed to the whole material system. At the same time, the friction between particles is intensified [ 18 ], which causes the composite to become brittle and more prone to cracking; moreover, more hot spots appear in the composite during the loading process, where reactions are more easily triggered. Therefore, the characteristic drop-height values of the ternary reactive materials all decrease when the content of Bi 2 O 3 particles increases.…”

Section: Results and Analysismentioning

confidence: 99%

“…The test results showed that PAB had the best combustion performance, prolonged reaction duration, and a significant gas production rate. Yuan Ying [ 18 , 19 ] studied and established a prediction model for the impact sensitivity of PAB. Subsequently, the reaction behavior of functional gradient materials composed of PAB was studied using ballistic impact tests, and the enhanced energy release performance of PTFE-based materials by Bi 2 O 3 was confirmed.…”

Section: Introductionmentioning

confidence: 99%

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Energy Release Characteristics and Reaction Mechanism of PTFE/Al/Bi2O3 Reactive Materials under Drop-Hammer Test

Jiang

Mao

et al. 2022

Polymers

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To obtain the influence of the Bi2O3 particle content of a PTFE/Al/Bi2O3 reactive material (later referred to as PAB) on its shock-induced chemical reaction (SICR) characteristics, five kinds of PAB with different Bi2O3 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 Bi2O3 content, the shock-induced chemical reaction duration and the sensitivity of PAB increase, and then decrease. When the Bi2O3 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/Bi2O3 reaction, an Al/Bi2O3 reaction, pyrolysis of the melted PTFE, and a C2F4/Al reaction; moreover, the presence of Bi2O3 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.

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Section: Results and Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Energy Release Characteristics and Reaction Mechanism of PTFE/Al/Bi2O3 Reactive Materials under Drop-Hammer Test

Jiang

Mao

et al. 2022

Polymers

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“…As the falling height of the drop mass increases, the input energy of the drop hammer to the reactive material is merely related to the gravitational potential energy of the hammer [38,39]. Meanwhile, a higher drop height results in a higher impact velocity of the hammer, which leads to higher loading strain rates.…”

Section: Effect Of Drop Heightmentioning

confidence: 99%

Bulk Density Homogenization and Impact Initiation Characteristics of Porous PTFE/Al/W Reactive Materials

Geng

Wang

et al. 2020

Materials

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In this research, the bulk density homogenization and impact initiation characteristics of porous PTFE/Al/W reactive materials were investigated. Cold isostatic pressed (CIPed) and hot temperature sintered (HTSed) PTFE/Al/W reactive materials of five different theoretical maximum densities were fabricated via the mixing/pressing/sintering process. Mesoscale structure characteristics of the materials fabricated under different molding pressures were compared while the effect of molding pressures on material bulk densities was analyzed as well. By using the drop weight testing system, effects of the theoretical maximum densities (TMDs), drop heights and molding pressures on the impact initiation characteristics were studied. Quantitatively, characteristic drop heights (H50) for different types of materials were obtained. The two most significant findings of this research are the density homogenization zone and the sensitivity transition zone, which would provide meaningful guides for further design and fabrication of reactive materials.

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“…Recently, for PTFE/Al composites, the formulations and fabrications [ 3 ], impact initiation [ 4 ], and chemical reaction [ 5 ] have been studied. Especially in terms of formulation, by adding metal powders or metal oxides, such as MoO3 [ 6 ], Bi2O3 [ 7 ], and CuO [ 8 ], to PTFE/Al composites, the heat release and gas product amount can be improved. The reactive liner is fabricated by means of uniform mixing, cold pressing, and sintering [ 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

Formation Behavior and Reaction Characteristic of a PTFE/Al Reactive Jet

Guo

Zheng

et al. 2022

Materials

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To reveal the expansion phenomenon and reaction characteristics of an aluminum particle filled polytetrafluoroethylene (PTFE/Al) reactive jet during the forming process, and to control the penetration and explosion coupling damage ability of the reactive jet, the temperature and density distribution of the reactive jet were investigated by combining numerical simulation and experimental study. Based on the platform of AUTODYN-3D code, the Smoothed Particle Hydrodynamics (SPH) algorithm was used to study the evolution behaviors and distribution regularity of the morphology, density, temperature, and velocity field during the formation process of the reactive composite jet. The reaction characteristic in the forming process was revealed by combining the distribution of the high-temperature zone in numerical simulation and the Differential Scanning Calorimeter/Thermo-Gravimetry (DSC/TG) experiment results. The results show that the distribution of the high-temperature zone of the reactive composite jet is mainly concentrated in the jet tip and the axial direction, and the reactive composite jet tip reacts first. Combining the density distribution in the numerical simulation and the pulsed X-ray experimental results, the forming behavior of the reactive composite jet was analyzed. The results show that the reactive composite jet has an obvious expansion effect, accompanied by a significant decrease in the overall density.

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Impact-Induced Reaction Characteristic and the Enhanced Sensitivity of PTFE/Al/Bi2O3 Composites

Cited by 17 publications

References 18 publications

Energy Release Characteristics and Reaction Mechanism of PTFE/Al/Bi2O3 Reactive Materials under Drop-Hammer Test

Energy Release Characteristics and Reaction Mechanism of PTFE/Al/Bi2O3 Reactive Materials under Drop-Hammer Test

Bulk Density Homogenization and Impact Initiation Characteristics of Porous PTFE/Al/W Reactive Materials

Formation Behavior and Reaction Characteristic of a PTFE/Al Reactive Jet

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