Abstract
Al/PTFE/W is a typical kind of reactive material, which has a variety of potential applications in the future. Impact experiments were conducted with a gas gun and a steel target to investigate the impact-induced initiation thresholds of Al/PTFE/W (18.55 wt.%/51.45 wt.%/30 wt.%) rods. The Al/PTFE/W rods were prepared by using the cold press and hot sinter method. A high-speed camera was used to observe the time sequence of events and to measure the speed of the rods by the grids on the background board. At low velocity, no initiation occurred and the rods only appeared upsetting. Above an initiation threshold of around 127m/s, extensive chemical reaction with strong flare was observed after impact. There was a time interval for the flare after impact, and this time interval decreased with increasing of impact velocity, from 138μs(127.4m/s) to 68μs (235m/s). Several experiments were performed for PTFE and Al/PTFE (26.5 wt.%/73.5 wt.%) rods for comparison with the Al/PTFE/W rods. The effect of impact velocity and composition on the impact-induced reaction of Al/PTFE/W was discussed.
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