Experimental Study of PTFE Powder Size Impact to Mg/PTFE Pyrotechnic Composition

Abstract:

To discover the polytetrafluoroethylene (PTFE) powder size impact to Mg/PTFE pyrotechnic composition, hot compatibility of various particle sizes of PTFE powder with spherical superfine Mg powder was studied. Safety performance of Mg/PTFE pyrotechnic composition was also researched by parameters of friction and impact sensitivity. Burning temperature and velocity were recorded and analysed. The result shows that the Mg/PTFE exothermic temperature peak floats =0.8~2.2°C, apparent activation energy alter ratio (AAEAR) =12.5%~17.8%, ignition probability due to friction sensitivity =0.32~0.48 and to impact sensitivity =0. It indicates that PTFE powder size will not inflect the safety of Mg/PTFE composition, which burns more stable with PTFE size great than 400μm. Once mass combustion velocity 2.09~3.87 g•cm-2•s-1 and linearcombustion velocity 5.02~8.13 mm•s-1, the combustion velocity will increase much by following with PTFE particle sizes decrease.

• Periodical: Advanced Materials Research (Volumes 463-464)
• Pages: 281-285
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.463-464.281
• Online since: February 2012
• Authors: Xin Chen, Jun Zhao, Gong Pei Pan, Hui Ping Lv
• Keywords: Mg, Mg/PTFE Pyrotechnic Composition, Particle Size, PTFE

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