Research on work efficiency and energy release model of Al/PTFE mixture under electric ignition

Abstract To evaluate the real-time work efficiency and energy release of the active material Al/PTFE reaction process, a self-designed closed container experimental device was used to load two different ingrdients Al/PTFE (the mass percentages of Al/PTFE were 26.5%/73.5% and 50%/50%) through electric ignition Al/PTFE mixture sample, combining with overpressure sensor, transient optical fiber pyrometer, infrared thermal imager, transient response thermocouple and high-speed camera, the response test system composed of Al/PTFE deflagration the reaction process is monitored and recorded in real-time, and a theoretical model of work and energy release is established. The result shows that the deflagration reaction duration of 6.5 g active material Al/PTFE (ωAl = 26.5%) is about 0.185 s in a closed container; the work and energy release characteristics of Al/PTFE mixtures of different ingredients are different, and Al/PTFE (ωAl = 26.5%) is superior to Al/PTFE (ωAl = 50%) in work and energy release characteristics; Al/PTFE (ωAl = 26.5%) has a maximum working capacity of 4.86 kJ/g and a maximum energy release capacity of 12.64 kJ/g, the maximum work efficiency is 38.5%; however the maximum energy release capacity of Al/PTFE (ωAl = 50%) is 2.24 kJ/g, the maximum energy release capacity is 6.65 kJ/g, and the maximum work efficiency is 33.7%.