An initiation phenomenon of Al-PTFE under quasi-static compression

Enhanced Damage Effects of Multi‐Layered Concrete Target Produced by Reactive Materials Liner

“…RMs liners were prepared by AL and PTFE powder with a mass ratio of 26 wt%/74 wt%, and inert materials liners were made of fine copper with a density of 8.5 g/cm 3 . All liner samples were prepared by the process of mixing, cold pressing, and sintering methods reported in literature [17]. The same batch of powders were used to minimize the differences caused by different producers and technological process.…”

“…Ballistic experiments were conducted by R. G. Ames to investigate the initiation threshold of RMs, and the empirical relationship between initiation time and impact stress was expressed as (s-7.3) 0.6T = 48 for micro Al/PTFE. However, Bin Feng found that the RMs could also be initiated under quasi-static compression [17,18]. In fact, in chemically reacting systems, the temperature is a direct key parameter that controls the reaction behavior.…”

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

“…The differences of ignition temperature in the three studies are attributed to the diversity of materials and the difference of heating rate, but all three studies showed that thermite reaction Advances in Materials Science and Engineering needs high temperature (hundreds of degrees centigrade) to trigger. However, the temperature rise caused by quasi-static compression is low relatively (tens of degrees centigrade) according to the simulation result of Feng et al [14]; therefore it is not enough to trigger the reaction of Al and Fe 2 O 3 . Furthermore, despite the intense reaction of PTFE with Al, the duration may be too short to induce thermite reaction between Al and Fe 2 O 3 .…”

“…When the true stress reached about 75 Mpa, the initiation started from the vicinity of the outer surface of the cylinder where the shear force is the strongest, accompanied by explosion sound and bright lights. Then the reaction propagated from the edge to the interior of the specimen and quenched quickly; the whole ignition process lasted about 1 s, with about 90% of the [14], in which PTFE and Al had reacted with each other to form AlF 3 and C (carbon black). However, no initiation phenomenon was observed for any type A specimen, which could be attributed to the low toughness as mentioned above.…”

Influence of Temperature on the Mechanical Properties and Reactive Behavior of Al-PTFE under Quasi-Static Compression

“…Generally, Al-PTFE is thought to be inert under quasi-static compression. However, Feng et al [10] reported a reaction phenomenon of Al-PTFE samples after a specific heat treatment procedure under quasi-static loading. Micrographs and finite element simulation of the sample in the critical initiation state suggested that the reaction was more like a mechanochemical process rather than a thermochemical one.…”