Energy release in the reaction of metal powders with fluorine containing polymers

Lee, I.; Reed, Russell; Brady, V. L.; Finnegan, Stephen

doi:10.1007/bf01983730

Cited by 18 publications

(16 citation statements)

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“…The exothermic peak could be related to the solid-state reaction between titanium and boron [22][23] , which generates titanium borides. In Ti-B mixture with 1wt% PTFE, the DTA trace shows another small exothermic peak in the temperatare range of 510-570℃, corresponding to the reaction between titanium and PTFE [17][18]24] , in addition to the exothermic peak at 955℃ for the formation of titanium borides ( Fig. 1(b)).…”

Section: Thermal Analysismentioning

confidence: 96%

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Low-temperature Solid-state Synthesis of Nanometer TiB$lt;inf$gt;2$lt;/inf$gt;-TiC Composite Powder

Yin-hu¹,

Wang²,

Qiu-Ping³

et al. 2016

Journal of Inorganic Materials

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TiB 2 -TiC composite powders were prepared at low temperature in the Ti-B system with the PTFE polytetrafluoroethylene (polytetrafluoroethylene) as a chemical activator. Reaction temperature, phase composition and morphology were measured via differential thermal analysis, X-ray diffraction and field emission scanning electron microscopy (FESEM) in order to explore the reaction mechanism, respectively. Actual solid-state reaction synthesis experiments were carried out for the same composition in an argon atmosphere furnace. It was found that TiB 2 -TiC composite powder could be synthesized successfully at 550℃ by adding 10wt% PTFE into the initial reactant Ti-B mixture. The FESEM image showed that the average size of the product was smaller than 400 nm. According to differential thermal analysis results, the combustion synthesis mainly includes two reaction processes: firstly, the initial reaction between titanium and PTFE particles resulting in great amounts of heat release; subsequently, the released energy triggers the solid-state reaction between titanium and boron particles to form TiB 2 .

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Section: Thermal Analysismentioning

confidence: 96%

“…Si-C, Mo-Si-C, SiO 2 -Al-C. Furthermore, the reaction between titanium and PTFE is highly exothermic [17][18] and generates TiF 3 vapor at its sublimation temperature 1037℃ [11,19] , which has been considered by US military for ammunition enhancement [20][21] .…”

mentioning

confidence: 99%

Low-temperature Solid-state Synthesis of Nanometer TiB$lt;inf$gt;2$lt;/inf$gt;-TiC Composite Powder

Yin-hu¹,

Wang²,

Qiu-Ping³

et al. 2016

Journal of Inorganic Materials

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“…According to the previous reports Ti/PTFE energetic material system [17][18][19] and the thermodynamical data, 22 the possible reaction equations and enthalpies in Ti/C/ PTFE system are summarised systematically as follows:…”

Section: Mechanism Analysismentioning

confidence: 99%

“…Since Ti/PTFE ( polytetrafluoroethylene) system, a kind of energetic materials, presents an explosive energy release like TNT, [17][18][19] it has been continuously studied by US military for its possible applications in warheads in recent years. 20,21 Therefore, PTFE was employed as accelerant in present study, in order to significantly reduce the reaction temperature of Ti + C → TiC.…”

Section: Introductionmentioning

confidence: 99%

Low-temperature solid state synthesis of TiC from Ti/C elemental powder mixture induced by polytetrafluoroethylene

Wang

Zhang

et al. 2015

Materials Research Innovations

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In order to significantly reduce the synthesis temperature, polytetrafluoroethylene was employed to induce the solid state synthesis of titanium carbide from elemental reactants. According to differential thermal analysis and X-ray diffraction results, titanium carbide can be synthesised successfully at the temperature as low as 825 K from Ti/C mixture with 3 wt-% polytetrafluoroethylene addition. The field emission scanning electron microscopy image showed that the size of the as-prepared titanium carbide particle was smaller than 150 nm.

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“…Under intensive dynamic loading, plastic deformation and flow, or a fracture process caused intimate mixing of constituents results in a diffusion-controlled ignition of the material, and chemical reaction then happens between the Al particles and the PTFE matrix. Recently, research has been conducted into formulations and fabrications [2,3], impact initiation [4][5][6], chemical reaction [7,8] and energy release characteristics [9][10][11], by combining the methods of theoretical, numerical and experimental, to promote the understanding of reactive materials.…”

Section: Introductionmentioning

confidence: 99%

Characterization of the Dynamic Response and Constitutive Behavior of PTFE/Al/W Reactive Materials

Zhang

Wang

2020

Propellants Explo Pyrotec

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In this study, the static and dynamic mechanical behaviors of four types of PTFE/Al/W reactive materials with different component mass ratios were studied. The mechanical properties of reactive materials at elevated strain rates and temperatures were tested by quasi-static compression and Split Hopkinson Pressure Bar (SHPB). Parametric study on material properties was carried out, and the Johnson-Cook constitutive constants were well determined. Based on the good agreement between the predicted and tested constitutive response, a systematic com-parison of the static and dynamic behaviors, as well as the comprehensive stress-strain relationships were conducted, regarding the strain rate and temperature effect. Microscopic fractographic analysis of the tested samples reveals the localized thermal softening effects and fiber network formation phenomenon of the matrix, which dominate the overall mechanical response of the four types of PTFE/Al/W reactive materials, and contribute to the elasto-plastic property, strain hardening, strain rate strengthening and thermal softening effects. Figure 17. Microscopic images of PTFE/Al/W material after SHPB testing at an increasing magnification (a-d).

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Energy release in the reaction of metal powders with fluorine containing polymers

Cited by 18 publications

References 0 publications

Low-temperature Solid-state Synthesis of Nanometer TiB$lt;inf$gt;2$lt;/inf$gt;-TiC Composite Powder

Low-temperature Solid-state Synthesis of Nanometer TiB$lt;inf$gt;2$lt;/inf$gt;-TiC Composite Powder

Low-temperature solid state synthesis of TiC from Ti/C elemental powder mixture induced by polytetrafluoroethylene

Characterization of the Dynamic Response and Constitutive Behavior of PTFE/Al/W Reactive Materials

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