The Mechanical and Reaction Behavior of PTFE/Al/Fe2O3 under Impact and Quasi-Static Compression

Quasi-static compression and drop-weight test were used to characterize the mechanical and reaction behavior of PTFE/Al/Fe2O3 composites. Two kinds of PTFE/Al/Fe2O3 composites were prepared with different mass of PTFE, and the reaction phenomenon and stress-strain curves were recorded; the residuals after reaction were analyzed by X-ray diffraction (XRD). The results showed that, under quasi-static compression condition, the strength of the materials is increased (from 37.1 Mpa to 77.2 Mpa) with the increase of PTFE, and the reaction phenomenon occurred only in materials with high PTFE content. XRD analysis showed that the reaction between Al and Fe2O3 was not triggered with identical experimental conditions. In drop-weight tests, PTFE/Al/Fe2O3 specimens with low PTFE content were found to be more insensitive by high-speed photography, and a High Temperature Metal Slag Spray (HTMSS) phenomenon was observed in both kinds of PTFE/Al/Fe2O3 composites, indicating the existence of thermite reaction, which was confirmed by XRD. In PTFE/Al/Fe2O3 system, the reaction between PTFE and Al precedes the reaction between Al and Fe2O3.

[1]  E. Dreizin,et al.  Correlation of optical emission and pressure generated upon ignition of fully-dense nanocomposite thermite powders , 2013 .

[2]  J. Field,et al.  The temperature rise at the tip of fast-moving cracks in glassy polymers , 1975, Proceedings of the Royal Society of London. A. Mathematical and Physical Sciences.

[3]  Jin-Xu Liu,et al.  Investigation on reaction energy, mechanical behavior and impact insensitivity of W–PTFE–Al composites with different W percentage , 2016 .

[4]  W. Proud,et al.  High-strain, high-strain-rate flow and failure in PTFE/Al/W granular composites , 2008 .

[5]  W. Mock,et al.  Impact Initiation of Rods of Pressed Polytetrafluoroethylene (PTFE) and Aluminum Powders , 2005 .

[6]  W. Proud,et al.  High Strain and Strain-Rate Behaviour of PTFE/Aluminium/Tungsten Mixtures , 2007, 0711.1191.

[7]  K. Sun,et al.  Kinetics of thermite reaction in Al-Fe2O3 system , 2006 .

[8]  K. Vecchio,et al.  Particle size effect on strength, failure, and shock behavior in polytetrafluoroethylene-Al-W granular composite materials , 2008, 0806.1775.

[9]  Fengming Xu,et al.  Quasi‐Static Compression Properties and Failure of PTFE/Al/W Reactive Materials , 2017 .

[10]  K. Vecchio,et al.  MECHANICAL AND MICROSTRUCTURAL PROPERTIES OF PTFE/Al/W SYSTEM , 2008 .

[11]  Z. A. Munir,et al.  Thermite reactions: their utilization in the synthesis and processing of materials , 1993, Journal of Materials Science.

[12]  Wei Zhang,et al.  The mechanical behaviors of polytetrafluorethylene/Al/W energetic composites , 2009, Journal of physics. Condensed matter : an Institute of Physics journal.

[13]  J. Field,et al.  The ignition of a thin layer of explosive by impact; the effect of polymer particles , 1982, Proceedings of the Royal Society of London. A. Mathematical and Physical Sciences.

[14]  Z. Guan,et al.  Experimental study of the compression properties of Al/W/PTFE granular composites under elevated strain rates , 2013 .

[15]  M. Zachariah,et al.  Time-Resolved Mass Spectrometry of the Exothermic Reaction between Nanoaluminum and Metal Oxides: The Role of Oxygen Release , 2010 .

[16]  Zhongan Tao,et al.  A crack-induced initiation mechanism of Al-PTFE under quasi-static compression and the investigation of influencing factors , 2016 .

[17]  Xiang Fang,et al.  An initiation phenomenon of Al-PTFE under quasi-static compression , 2015 .

[18]  W. Marsden.  I and J , 2012 .